WO2021036946A1 - Battery charging control circuit and electronic device - Google Patents

Abstract

A battery charging control circuit and an electronic device. The battery charging control circuit comprises: a switch circuit (103); a starting circuit (102), the starting circuit (102) comprising a first port (B+) and a second port (B-), and when the positive electrode of a battery is electrically connected to the first port (B+), the negative electrode of the battery is electrically connected to the second port (B-), the switch circuit (103) is in a cut-off state, and the starting circuit (102) and the battery form a first current loop, such that the starting circuit (102) generates a starting signal, with the current flowing through the battery being a first current; and a controller (101) for controlling in a delayed manner, according to the starting signal, the switch circuit (103) to be in a conductive state, such that the starting circuit (102), the switch circuit (103) and the battery form a second current loop. A starting signal is generated by a first current loop produced through normal access of a battery, such that a second current loop is started in a delayed manner to charge the battery, thereby preventing a sparking phenomenon when the battery is charged.

Description

Battery charging control circuit and electronic equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on August 23, 2019, the application number is 201910784850.8, and the application name is "a battery charging control circuit and electronic equipment", the entire content of which is incorporated herein by reference Applying.

Technical field

This application relates to the field of battery technology, in particular to a battery charging control circuit and electronic equipment.

Background technique

A battery refers to a part of the space of a cup, tank or other container or composite container that contains an electrolyte solution and metal electrodes to generate electric current, and can convert chemical energy into electrical energy. Moreover, the battery as an energy source is a necessary component for the operation of various electronic devices. For example, taking an aircraft, such as an unmanned aerial vehicle, for example, the battery provides electrical energy for the various systems of the unmanned aerial vehicle to ensure the flight of the unmanned aerial vehicle and aerial photography during the flight.

In battery applications, a battery protection circuit is usually configured to provide the battery with protection functions such as over-discharge, over-charge, over-current, and over-temperature. There is a relatively common problem in the use of batteries, that is, sparking due to poor contact during charging.

Summary of the invention

The purpose of the embodiments of the present invention is to provide a battery charging control circuit and electronic equipment, so as to avoid sparking during charging.

The embodiments of the present invention disclose the following technical solutions:

In the first aspect, an embodiment of the present invention provides a battery charging control circuit, including:

A battery charging control circuit includes:

Switch circuit

The starting circuit is electrically connected to the switch circuit. The starting circuit includes a first port and a second port. When the positive electrode of the battery is electrically connected to the first port, the negative electrode of the battery is electrically connected to the second port, and When the switch circuit is in the off state, the starting circuit and the battery form a first current loop, so that the starting circuit generates a starting signal, wherein the current flowing through the battery is the first current;

The controller is respectively electrically connected to the switch circuit and the start circuit, and is used to delay control the switch circuit to be in the conducting state according to the start signal, so that the start circuit, the switch circuit, and the start circuit are turned on. The battery forms a second current loop, wherein the current flowing through the battery is a second current, and the second current is greater than the first current.

Optionally, the starting circuit includes:

The first current limiting circuit includes the first port;

A unidirectional conduction circuit, connected in parallel with the first current limiting circuit;

A second current-limiting circuit electrically connected to the unidirectional conduction circuit, and the second current-limiting circuit includes the second port;

The first trigger circuit is electrically connected to the second current limiting circuit and the controller respectively;

When the positive pole of the battery is electrically connected to the first port, the negative pole of the battery is connected to the second port, and the switch circuit is in the off state, the first current limiting circuit and the second current limiting circuit A circuit, the first trigger circuit, and the battery form the first current loop, so that the first trigger circuit generates the start signal;

When the positive pole of the battery is electrically connected to the first port, the negative pole of the battery is electrically connected to the second port, and the switch circuit is in a conducting state, the unidirectional conducting circuit, the battery, and the The switch circuit forms the second current loop.

Optionally, when the battery is not electrically connected between the first port and the second port, the second current limiting circuit and the first trigger circuit form a third current loop, wherein The first trigger circuit does not generate the start signal.

Optionally, the first current limiting circuit includes a first resistor;

One end of the first resistor is the first port, and the other end of the first resistor is electrically connected to the second current limiting circuit and used to connect to a first power source.

Optionally, the unidirectional conduction circuit includes a first diode;

The anode of the first diode is electrically connected to the other end of the first resistor, and the cathode of the first diode is electrically connected to the first port.

Optionally, the second current limiting circuit includes a second diode, a second resistor, and a third resistor;

The anode of the second diode is electrically connected to the anode of the first diode, and the cathode of the second diode is electrically connected to one end of the second resistor;

The other end of the second resistor is electrically connected to one end of the third resistor and the first trigger circuit; and

One end of the third resistor is connected to the second port, and the other end of the third resistor is grounded.

Optionally, the first trigger circuit includes a first optocoupler and a fourth resistor;

One end of the primary side of the first optocoupler is electrically connected to the other end of the second resistor, the other end of the primary side of the first optocoupler is electrically connected to one end of the third resistor, and the first optocoupler is electrically connected to one end of the third resistor. One end of the secondary side is electrically connected to one end of the fourth resistor, and the other end of the secondary side of the first optocoupler is grounded; and

One end of the fourth resistor is electrically connected to the controller, and the other end of the fourth resistor is used to connect to a second power source.

Optionally, the first trigger circuit includes a first switch tube and a fourth resistor;

The control end of the first switch tube is electrically connected to the other end of the second resistor, one end of the first switch tube is electrically connected to one end of the fourth resistor, and the other end of the first switch tube is electrically connected to The second port is electrically connected; and

One end of the fourth resistor is electrically connected to the controller, and the other end of the fourth resistor is used to connect to a second power source.

Optionally, the battery charging control circuit further includes a reverse connection detection circuit, the input end of the reverse connection detection circuit is electrically connected to the second port, and the output end of the reverse connection detection circuit is electrically connected to the controller. connection;

When the positive electrode of the battery is electrically connected to the second port, the negative electrode of the battery is electrically connected to the first port, and the switch circuit is in the off state, the reverse connection detection circuit is used to respond to all The excitation of the battery generates a reverse connection detection signal, so that the controller controls the switch circuit to be in a cut-off state according to the reverse connection detection signal.

Optionally, the reverse connection detection circuit includes:

The third current limiting circuit is electrically connected to the second port; and

The second trigger circuit is electrically connected to the third current limiting circuit;

When the positive pole of the battery is electrically connected to the second port, the negative pole of the battery is electrically connected to the first port, and the switch circuit is in the off state, the third current limiting circuit is connected to the first port. The two trigger circuits form a fourth current loop, so that the second trigger circuit generates a reverse connection detection signal.

Optionally, the third current limiting circuit includes a third diode and a fifth resistor;

The anode of the third diode is electrically connected to the second port, and the cathode of the third diode is electrically connected to one end of the fifth resistor; and

The other end of the fifth resistor is electrically connected to the second trigger circuit and used to connect to the first power source.

Optionally, the second trigger circuit includes a second optocoupler and a sixth resistor;

One end of the primary side of the second optocoupler is electrically connected to the other end of the fifth resistor, the other end of the primary side of the second optocoupler is used to connect to the first power source, and the secondary side of the second optocoupler One end is electrically connected to one end of the sixth resistor, and the other end of the secondary side of the second optocoupler is grounded; and

One end of the sixth resistor is electrically connected to the controller, and the other end of the sixth resistor is used to connect to a second power source.

Optionally, the second trigger circuit includes: a second switch tube and a sixth resistor;

The control end of the second switch tube is electrically connected to the other end of the fifth resistor, one end of the second switch tube is electrically connected to one end of the sixth resistor, and the other end of the second switch tube is used for To access the first power source;

One end of the sixth resistor is connected to the controller, and the other end of the sixth resistor is used to connect to a second power source.

Optionally, the battery charging control circuit further includes a reverse connection prompt circuit, the input end of the reverse connection prompt circuit is electrically connected to the second port, and the output end of the reverse connection prompt circuit is electrically connected to the start circuit. connection;

When the positive pole of the battery is connected to the second port, the negative pole of the battery is connected to the first port, and the switch circuit is in an off state, the reverse connection prompt circuit is used to respond to the battery The stimulus to produce a reverse connection prompt signal.

Optionally, the reverse connection prompt circuit includes a seventh resistor and a light emitting diode;

One end of the seventh resistor is electrically connected to the second port, and the other end of the seventh resistor is electrically connected to the anode of the light emitting diode;

The cathode of the light emitting diode is electrically connected to the anode of the first diode.

Optionally, the second current limiting circuit further includes an eighth resistor;

One end of the eighth resistor is electrically connected to the other end of the second resistor, and the other end of the eighth resistor is connected to the second port.

Optionally, the third current limiting circuit further includes a ninth resistor;

One end of the ninth resistor is electrically connected to the other end of the fifth resistor, and the other end of the ninth resistor is used to connect to the first power source.

Optionally, the switch circuit includes a third switch tube and a tenth resistor;

The control end of the third switch tube is electrically connected to the controller, one end is grounded, and the other end is connected to the second port;

One end of the tenth resistor is electrically connected to the control end of the third switch tube, and the other end of the tenth resistor is electrically connected to one end of the third switch tube.

In the second aspect, an embodiment of the present invention provides an electronic device, including a battery and the battery charging control circuit as described above.

In an embodiment of the present invention, a battery charging control circuit and an electronic device are provided. The battery charging control circuit includes: a switch circuit; a start circuit connected to the switch circuit, the start circuit includes a first port and a second port, When the positive pole of the battery is electrically connected to the first port, the negative pole of the battery is connected to the second port, and the switch circuit is in the off state, the starting circuit and the battery form a first current loop , So that the start circuit generates a start signal, wherein the current flowing through the battery is the first current; the controller is respectively connected to the switch circuit and the start circuit for delaying according to the start signal When controlling the switch circuit to be in the conducting state, so that the starting circuit, the switch circuit, and the battery form a second current loop, wherein the current flowing through the battery is the second current, and the second current The current is greater than the first current. The start signal is generated by the first current loop generated by the normal connection of the battery, so that the second current loop is turned on with a delay to charge the battery, and the ignition phenomenon of the battery during charging is avoided.

Description of the drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. The elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the attached drawings do not constitute a scale limitation.

FIG. 1 is a schematic structural diagram of a battery charging control circuit provided by an embodiment of the present invention;

2 is a schematic diagram of the structure of a startup circuit provided by an embodiment of the present invention;

3 is a circuit diagram of a battery charging control circuit provided by an embodiment of the present invention;

4 is a circuit diagram of another battery charging control circuit provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another battery charging control circuit provided by an embodiment of the present invention;

6 is a schematic diagram of the structure of a reverse connection detection circuit provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another battery charging control circuit provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

detailed description

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not used to limit the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or a central element may also be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only, and are not meant to be the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field belonging to the type of the present invention. The terminology used in the description of the invention herein is only for the purpose of describing specific embodiments, and is not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

FIG. 1 is a schematic diagram of an anti-reverse charging circuit for a battery provided by an embodiment of the present invention. Wherein, the battery charging control circuit 100 includes:

Switch circuit 13;

The starting circuit 12 is electrically connected to the switch circuit 13. The starting circuit 12 includes a first port and a second port. When the positive electrode of the battery is electrically connected to the first port, the negative electrode of the battery is electrically connected to When the second port and the switch circuit 13 are in the cut-off state, the starting circuit 12 and the battery form a first current loop, so that the starting circuit 12 generates a starting signal, which flows through the battery The current is the first current;

The controller 11 is electrically connected to the switch circuit 13 and the starting circuit 12 respectively, and is used for controlling the switch circuit to be in the conducting state with a delay according to the starting signal, so that the starting circuit 12, the starting circuit 12 and the starting circuit 12 are turned on. The switch circuit 13 and the battery form a second current loop, wherein the current flowing through the battery is a second current, and the second current is greater than the first current.

Specifically, the startup circuit 12 and the switch circuit 13 are respectively connected to the I/O ports of the controller 11. When the controller 11 detects that the I/O port corresponding to the start circuit 12 generates a start signal, it generates another charging signal and outputs it to the I/O port corresponding to the switch circuit 13 with a delay. The switch circuit 13 is used to control the switch circuit 13 to be in a conducting state. Wherein, the switch circuit is in a cut-off state before receiving the charging signal sent by the controller 11. When the positive pole of the battery is connected to the first port and the negative pole of the battery is connected to the second port, the switch circuit 13 jumps to the conducting state, and one end of the switch circuit is grounded, and the start circuit 12 The external first power source flows through the start circuit 12 and is connected to one end (the first port) of the battery, thereby forming a second current loop of the start circuit 12, the battery and the switch circuit 13, and the second current In the loop state, the battery is charged by the external first power source of the starting circuit, wherein the first power source can be the power output from the external power supply network or any suitable power supply circuit.

For example, the start signal is preset to be a high-level signal. When the user connects the positive pole of the battery to the first port of the startup circuit 12 and the negative pole to the second port of the startup circuit 12, a first current loop between the startup circuit and the battery is formed, and the The startup circuit will generate a high-level signal (start signal) and send it to the I/O port of the controller. After receiving the start signal, the controller will delay the output of high voltage through another I/O port. The level signal is sent to the switch circuit 13, and the switch circuit 13 switches from the off state to the on state after receiving the high level signal, thereby forming the second current of the startup circuit 12, the battery, and the switch circuit 13 Loop, the battery is in a charged state in the second current loop.

Wherein, if the voltage of the first power source is greater than the voltage of the battery, the second current flowing through the second current loop is greater than the first current flowing through the first current loop.

It should be noted that when the battery is normally connected to the battery charging control circuit 100 (that is, the positive electrode of the battery is connected to the first port of the starting circuit 12, and the negative electrode is connected to the second port of the starting circuit 12) The charging control circuit 100 will not charge the battery immediately, but will delay the preset time after detecting that the battery is normally connected to the battery charging control circuit 100 before charging the battery to Ensure the sparking phenomenon caused by plugging and unplugging in the energized state, and improve the safety performance.

In addition, when the battery is reversely connected to the battery charging control circuit 100 (that is, the negative electrode of the battery is connected to the first port of the starting circuit 12, and the positive electrode is connected to the second port of the starting circuit 12), so The battery and the starting circuit 12 will not form a loop, and will not generate a starting signal. The switch circuit 13 is in the off state, so the battery cannot be charged, which further avoids the phenomenon of reverse charging of the battery and improves safety .

Wherein, the power input terminal of the controller 11 is connected to a second power source, and the power output terminal is grounded, where the second power source is the power supply voltage of the controller.

It should be noted that the above-mentioned battery can be any type of battery, such as a lithium battery, a nickel-cadmium battery, a nickel-hydrogen battery, a lead-acid battery, and so on. And the battery is composed of a number of single cells connected in series. The battery is made up of a number of single cells in series in order to meet the power supply requirements of various electrical equipment. For example, it can meet the power requirements of the motors of unmanned aerial vehicles and other aircraft. For example, the battery includes 4 or more than 4 single batteries, and the 4 or more than 4 single batteries are connected in series to meet different power supply requirements. Accordingly, the voltage of the charger used to charge the battery is greater than 16V to ensure the normal charging of the battery.

In various embodiments of the present invention, the battery charging control circuit includes: a switch circuit; a start circuit connected to the switch circuit, the start circuit includes a first port and a second port, when the positive electrode of the battery is connected to In the first port, the negative electrode of the battery is connected to the second port, and when the switch circuit is in an off state, the startup circuit and the battery form a first current loop, so that the startup circuit generates The start signal, wherein the current flowing through the battery is the first current; the controller is respectively connected to the switch circuit and the start circuit, and is used for delaying control of the switch circuit to be in conduction according to the start signal. The on state, so that the starting circuit, the switch circuit, and the battery form a second current loop, wherein the current flowing through the battery is a second current, and the second current is greater than the first current. The start signal is generated by the first current loop generated by the normal connection of the battery, so that the second current loop is turned on with a delay to charge the battery, and the ignition phenomenon of the battery during charging is avoided.

Please refer to FIG. 2, which is a schematic diagram of a battery charging control circuit provided by an embodiment of the present invention. The battery charging control circuit 100 and the starting circuit 1 in the battery charging control circuit 100 provided by the embodiment of the present invention will be described in detail below in conjunction with FIG. 2 and the above-mentioned embodiments.

As shown in Fig. 2, the starting circuit 12 includes:

The first current limiting circuit 121 includes the first port B+;

The unidirectional conduction circuit 122 is connected in parallel with the first current limiting circuit 121;

The second current-limiting circuit 123 is electrically connected to the unidirectional conduction circuit 122, and the second current-limiting circuit includes the second port B-;

The first trigger circuit 124 is electrically connected to the second current limiting circuit 124 and the controller 11 respectively;

When the positive electrode of the battery is electrically connected to the first port B+, the negative electrode of the battery is connected to the second port B-, and the switch circuit 13 is in an off state, the first current limiting circuit 121 , The second current limiting circuit 123, the first trigger circuit 124, and the battery form the first current loop, so that the first trigger circuit 124 generates the start signal;

When the positive electrode of the battery is electrically connected to the first port B+, the negative electrode of the battery is connected to the second port B-, and the switch circuit 13 is in a conducting state, the unidirectional conduction circuit 122 , The battery and the switch circuit 13 form the second current loop.

Specifically, the unidirectional conduction circuit 122 is used to limit the conduction of the current from the first port B+ to the second current limiting circuit 123. The second current limiting circuit 123 is used to limit the magnitude of the first current and the second current. The first trigger circuit 124 is configured to generate a start signal according to the voltage in the first current loop and send it to the controller 11.

Optionally, the first current limiting circuit 121 and the second current limiting circuit 123 may be composed of resistors and/or diodes, the unidirectional conduction circuit 122 may be composed of diodes, and the first trigger circuit 124 may be composed of an optocoupler. It is composed of isolating components such as isolators or switch tubes, and the specific settings can be defined according to user needs.

Wherein, when the positive pole of the battery is connected to the first port B+, and the negative pole of the battery is connected to the second port B-, the switch circuit 13 switches from the off state to the on state after a delay of a preset time State; when the negative pole of the battery is connected to the first port B+ and the positive pole of the battery is connected to the second port B-, the switch circuit 13 is always in an off state; when the battery charging control circuit 100 does not When the battery is connected, the switch circuit 13 is in an off state.

Specifically, when the battery is not connected between the first port B+ and the second port B-, the second current limiting circuit 123 and the first trigger circuit 124 form a third current loop, Wherein, the first trigger circuit 124 does not generate the start signal.

Wherein, when the battery is not electrically connected between the first port B+ and the second port B-, the circuit resistance of the third current loop is relatively large, and the current flowing through the first trigger circuit 124 It is not enough to cause the first trigger circuit 124 to generate a start signal.

Specifically, referring to FIG. 3 and FIG. 4, the first current limiting circuit 121 includes: a first resistor R1;

One end of the first resistor R1 is the first port B+, and the other end of the first resistor R1 is electrically connected to the second current limiting circuit 123 and connected to the first power source Power.

Wherein, the first resistor R1 assumes the role of diversion and voltage division when forming the first current loop.

Specifically, the unidirectional conduction circuit 122 includes a first diode D1;

The anode of the first diode D1 is electrically connected to the other end of the first resistor R1, and the cathode of the first diode D1 is electrically connected to the first port B+.

Wherein, when the first diode D1 forms the second current loop, the second current is directly applied to the anode of the battery to improve the charging efficiency.

It should be noted that the first diode D1 can be any suitable diode. For example, the first diode D1 may be a Zener diode with a model number of BZX384-C16.

Specifically, the second current limiting circuit 123 includes a second diode D2, a second resistor R2, and a third resistor R3;

The anode of the second diode D2 is electrically connected to the anode of the first diode D1, and the cathode is electrically connected to one end of the second resistor R2;

The other end of the second resistor R2 is electrically connected to one end of the third resistor R3 and the first trigger circuit 124; and

One end of the third resistor R3 is connected to the second port B-, and the other end of the third resistor R3 is grounded.

Wherein, the second diode D2 plays a protective role, and the second resistor R2 and the third resistor R3 are used to limit the current. It should be noted that the resistance of the third resistor R3 is relatively large, so that when a third current loop is formed, the third current is not sufficient to enable the first trigger circuit 124 to generate a start signal.

Optionally, the second current limiting circuit 123 further includes: an eighth resistor R8;

One end of the eighth resistor R8 is connected to the other end of the second resistor R2, and the other end is connected to the second port B-.

Wherein, the eighth resistor R8 acts as a voltage divider.

Optionally, the first trigger circuit 124 includes: a first optocoupler U1 and a fourth resistor R4;

One end of the primary side of the first optocoupler U1 is connected to the other end of the second resistor R2, and the other end of the primary side of the first optocoupler U1 is connected to one end of the third resistor R3. One end of the secondary side is electrically connected to one end of the fourth resistor R4, and the other end of the secondary side of the first optocoupler U1 is grounded; and

One end of the fourth resistor R4 is connected to the controller 11, and the other end of the fourth resistor R4 is connected to the second power source.

Wherein, the fourth resistor R4 is connected to the port BAT_Correct of the controller 11. The forward voltage may be 3.3V.

Wherein, the first optocoupler U1 isolates the controller 11 from the battery charging control circuit and plays a protective role. At the same time, the first optocoupler U1 is also used to generate a start signal to pass the control The device 11 controls the working state of the switch circuit 13. The fourth resistor R4 acts as a voltage divider.

Optionally, the first trigger circuit 124 includes: a first switch tube Q1 and a fourth resistor R4;

The control end of the first switch tube Q1 is electrically connected to the other end of the second resistor R2, one end of the first switch tube Q1 is connected to one end of the fourth resistor R4, and the other end of the first switch tube Q1 is connected to The second port B-electrical connection; and

One end of the fourth resistor R4 is electrically connected to the controller 11, and the other end of the fourth resistor R4 is connected to a forward voltage.

Optionally, the first switching tube Q1 may be a triode or a MOS tube.

Wherein, the first switch tube Q1 isolates the controller 11 from the battery charging control circuit to play a protective role. At the same time, the first switch tube Q1 is also used to generate a start signal to pass the controller 11 The working state of the switch circuit 13 is controlled. The fourth resistor R4 acts as a voltage divider.

Specifically, the switch circuit 13 includes: a third switch tube Q3 and a tenth resistor R10;

The control end of the third switch tube Q3 is connected to the controller 11, one end of the third switch tube Q3 is grounded, and the other end of the third switch tube Q3 is connected to the second port. Wherein, the port VSG of the controller 11 is connected to the control terminal of the third switch tube Q3.

One end of the tenth resistor R10 is connected to the control end of the third switch tube Q3, and the other end of the tenth resistor R10 is connected to one end of the third switch tube Q3.

Wherein, the third switch tube may be a triode or a MOS tube, and the control end of the third switch tube is connected to the controller 11, and when the controller 11 sends the start signal to the third switch tube At Q3, the third switching tube Q3 is switched to the on state.

The specific charging process is:

Connect the anode of the battery to the first port B+, the cathode to the second port B-, the anode of the battery, the first resistor R1, the second diode D2, the second resistor R2, the first optocoupler U1, or The first switch tube Q1 and the negative electrode of the battery form a first current loop, and the current flow of the first current loop is the positive electrode of the battery, the first resistor R1, the second diode D2, the second resistor R2, the first optocoupler U1, or The first switch tube Q1, the negative electrode of the battery. The first optocoupler U1 or the first switch tube Q1 generates a start signal and sends it to the controller 11, and the controller 11 controls the switch circuit 13 to be turned on after a delay, wherein the start signal is at a low level, so The first current in the first current loop causes the first optocoupler U1 or the first switching tube Q1 to operate, pulling down the voltage across the primary side of the first optocoupler U1 or pulling down the first switching tube The voltage at both ends of Q1 corresponds to the low level detected by the I/O port of the controller 11, and the controller 11 controls the switch circuit 13 to be in an on state. When the switch circuit 13 is in a conducting state, a second current loop is formed. The second current loop is the first power source Power, the first diode, the battery anode, the battery cathode, and the switch circuit, and the current flow of the second current loop is the first power source Power, the first diode, and the battery anode. , The negative electrode of the battery, the switch circuit, the second current loop, the second current is greater than the first current, and the battery is in a charging state.

It should be noted that when the battery charging control circuit 100 is in a standby state (no battery is connected to the battery charging control circuit 100), there is a third current loop, and the third current loop includes the first power source Power, the second power source, and the second power source. A pole tube D2, a second resistor R2, and a third resistor R3. The current flow of the third current loop is the first power source Power, the second diode D2, the first optocoupler U1, the second resistor R2, and the third resistor. R3 and ground. Because the resistance of the third resistor R3 is sufficiently large, the current of the third current loop is not sufficient to drive the first optocoupler U1 and the first switch Q1 to conduct. Therefore, the switch circuit 13 is in an off state.

In various embodiments of the present invention, the battery charging control circuit includes: a switch circuit; a start circuit connected to the switch circuit, the start circuit includes a first port and a second port, when the positive electrode of the battery is connected to In the first port, the negative electrode of the battery is connected to the second port, and when the switch circuit is in an off state, the startup circuit and the battery form a first current loop, so that the startup circuit generates The start signal, wherein the current flowing through the battery is the first current; the controller is respectively connected to the switch circuit and the start circuit, and is used for delaying control of the switch circuit to be in conduction according to the start signal. The on state, so that the starting circuit, the switch circuit, and the battery form a second current loop, wherein the current flowing through the battery is a second current, and the second current is greater than the first current. The start signal is generated by the first current loop generated by the normal connection of the battery, so that the second current loop is turned on with a delay to charge the battery, and the ignition phenomenon of the battery during charging is avoided.

Please refer to FIG. 5 and the foregoing embodiment. FIG. 5 is a schematic diagram of a battery charging control circuit provided by an embodiment of the present invention. The battery charging control circuit 100 provided by the embodiment of the present invention will be described in detail below with reference to FIG. 5.

As shown in FIG. 5, the battery charging control circuit 100 further includes a reverse connection detection circuit 14. The input end of the reverse connection detection circuit 14 is connected to the second port B-, and the output of the reverse connection detection circuit 14 Terminal is electrically connected to the controller 11;

When the positive pole of the battery is connected to the second port B-, the negative pole of the battery is connected to the first port B+, and the switch circuit 13 is in an off state, the reverse connection detection circuit 14 is used In response to the excitation of the battery, a reverse connection detection signal is generated, so that the controller 11 controls the switch circuit 13 to be in a cut-off state according to the reverse connection detection signal.

Specifically, the reverse connection detection circuit 14 is used to detect whether the battery is reversely connected to the battery charging control circuit 100 (the negative electrode of the battery is connected to the first port, and the positive electrode of the battery is connected to the first port. Two ports), if yes, control the switch circuit 13 to be in an off state to prevent reverse charging of the battery. The output terminal of the reverse connection detection circuit 14 is connected to the I/O port of the controller 11. When the controller 11 receives the reverse connection detection signal sent by the reverse connection detection circuit 14 through the I/O port, it controls the switch circuit 13 to be in an off state to avoid reverse charging of the battery.

Specifically, as shown in FIG. 6, the reverse connection detection circuit 14 includes:

The third current limiting circuit 141 is electrically connected to the second port B-; and

The second trigger circuit 142 is electrically connected to the third current limiting circuit 141;

When the positive electrode of the battery is electrically connected to the second port, the negative electrode of the battery is electrically connected to the first port, and the switch circuit 13 is in the off state, the third current limiting circuit 141 is connected to the The second trigger circuit 142 forms a fourth current loop, so that the second trigger circuit 132 generates a reverse connection detection signal.

Wherein, one end of the second trigger circuit 142 is connected to a first power source Power, and the first power source Power is the same as the first power source Power connected to the startup circuit 12 to ensure that the second trigger circuit 142 is There is no pressure difference. When the battery is connected in the reverse direction (the negative electrode of the battery is connected to the first port B+, and the positive electrode of the battery is connected to the second port B-), the current of the battery flows through the third port. The current limiting circuit 141 and the second trigger circuit 142 enable the second trigger circuit to send a reverse connection detection signal to the controller 11 so that the controller 11 controls the switch circuit 13 to be in an off state. It should be noted that when the second trigger circuit 142 sends a reverse connection detection signal to the server, even if the start signal is received, the switch circuit 13 is still in an off state, in other words, the reverse connection The priority of the detection signal is greater than the priority of the start signal.

Specifically, referring to FIG. 3 and FIG. 4, the third current limiting circuit 141 includes: a third diode D3 and a fifth resistor R5;

The anode of the third diode D3 is connected to the second port B-, and the cathode of the third diode D3 is connected to one end of the fifth resistor R5;

The other end of the fifth resistor R5 is electrically connected to the second trigger circuit 142 and is connected to the first power source Power.

Wherein, the third diode D3 and the fifth resistor R5 are used for current limiting and voltage dividing.

Optionally, the third current limiting circuit 141 further includes: a ninth resistor R9;

One end of the ninth resistor R9 is connected to the other end of the fifth resistor R5, and the other end of the ninth resistor R9 is connected to the first power source Power.

Wherein, the function of the ninth resistor R9 is a partial pressure.

Optionally, the second trigger circuit 142 includes: a second optocoupler U2 and a sixth resistor R6;

One end of the primary side of the second optocoupler U2 is electrically connected to the other end of the fifth resistor R5, the other end of the primary side of the second optocoupler U2 is connected to the first power source Power, and the second optocoupler U2 One end of the secondary side is electrically connected to one end of the sixth resistor R6, and the other end of the secondary side of the second optocoupler U2 is grounded;

One end of the sixth resistor R6 is connected to the controller 11, and the other end of the sixth resistor R6 is connected to a second power source.

Wherein, one end of the sixth resistor R6 is connected to the port BAT_Reverse of the controller 11, and the forward voltage may be 3.3V.

Wherein, the second power source may be a forward voltage of 3.3V.

Wherein, the second optocoupler U2 isolates the controller 11 from the power circuit for protection, and the second optocoupler U2 is also used to generate a reverse connection detection signal to control the controller 11 The switch circuit 13 is in an off state. The sixth resistor R6 acts as a voltage divider.

Optionally, the second trigger circuit 142 includes: a second switch tube Q2 and a sixth resistor R6;

The control terminal of the second switch tube Q2 is connected to the other end of the fifth resistor R5, one end of the second switch tube Q2 is electrically connected to one end of the sixth resistor R6, and the second switch tube Q2 is electrically connected to one end of the sixth resistor R6. The other end is connected to the first power source Power;

One end of the sixth resistor R6 is connected to the controller 11, and the other end of the sixth resistor R6 is connected to a second power source.

Optionally, the second switching tube Q2 may be a triode or a MOS tube.

Wherein, the second switch tube Q2 isolates the controller 11 from the power supply circuit for protection, and at the same time, the second switch tube Q2 is also used to generate a reverse connection detection signal to control the controller 11 The switch circuit 13 is in an off state. The sixth resistor R6 acts as a voltage divider.

The specific control process is:

When the anode of the battery is connected to the second port B-, the cathode of the battery is connected to the first port B+, the anode of the battery, the third diode D3, the fifth resistor R5, and the second light The coupling U2 or the second switching tube Q2 and the first power supply Power form a fourth current loop, and the current flow of the fourth current loop is the positive electrode of the battery, the third diode D3, the fifth resistor R5, and the second optocoupler. U2 or the second switch tube Q2, the first power source Power. When the fourth current loop is formed, the second optocoupler U2 or the second switching tube Q2 generates a reverse connection detection signal and sends it to the controller 11, so that the controller 11 controls the operation of the switching circuit 13 In the cut-off state, it is ensured that the battery will not be reversely charged and the safety performance is improved.

In various embodiments of the present invention, the battery charging control circuit includes: a switch circuit; a start circuit connected to the switch circuit, the start circuit includes a first port and a second port, when the positive electrode of the battery is connected to In the first port, the negative electrode of the battery is connected to the second port, and when the switch circuit is in an off state, the startup circuit and the battery form a first current loop, so that the startup circuit generates The start signal, wherein the current flowing through the battery is the first current; the controller is respectively connected to the switch circuit and the start circuit, and is used for delaying control of the switch circuit to be in conduction according to the start signal. The on state, so that the starting circuit, the switch circuit, and the battery form a second current loop, wherein the current flowing through the battery is a second current, and the second current is greater than the first current. The start signal is generated by the first current loop generated by the normal connection of the battery, so that the second current loop is turned on with a delay to charge the battery, and the ignition phenomenon of the battery during charging is avoided.

Please refer to FIG. 7, which is a schematic diagram of a battery charging control circuit provided by an embodiment of the present invention. The battery charging control circuit 100 provided by the embodiment of the present invention will be described in detail below with reference to FIG. 7.

The battery charging control circuit 100 also includes a reverse connection prompt circuit 15. The input end of the reverse connection prompt circuit 15 is connected to the second port B-, and the output end of the reverse connection prompt circuit 15 is connected to the start circuit. 12 connections;

When the positive pole of the battery is connected to the second port B-, the negative pole of the battery is connected to the first port B+, and the switch circuit 13 is in the cut-off state, the reverse connection prompt circuit 15 is used for In response to the excitation of the battery, a reverse connection prompt signal is generated.

Wherein, the reverse connection prompt signal may be an optical signal for prompting the user that the battery is connected to the battery charging control circuit 100 incorrectly.

Specifically, referring to FIG. 3 and FIG. 4, the reverse connection prompt circuit 15 includes: a seventh resistor R7 and a light emitting diode D4;

One end of the seventh resistor R7 is connected to the second port B-, and the other end of the seventh resistor R7 is connected to the anode of the light emitting diode D4;

The cathode of the light emitting diode D4 is electrically connected to the anode of the first diode D1.

Wherein, the seventh resistor R7 is used for voltage division and current limiting. The light emitting diode D4 is used when the battery is reversely connected to the battery charging control circuit 100 (when the positive pole of the battery is connected to the second port B-, and the negative pole of the battery is connected to the first One port B+) lights up to remind the user of a battery connection error.

The specific workflow is:

When the battery is reversely connected to the battery charging control circuit 100 (when the positive pole of the battery is connected to the second port B-, and the negative pole of the battery is connected to the first port B+), the The anode of the battery, the seventh resistor R7, the light emitting diode D4, the first diode and the cathode of the battery form a fifth current loop, and the current of the fifth current flows to the anode of the battery, the seventh resistor R7, the light emitting diode D4, and the A diode is connected to the negative electrode of the battery, and when the fifth current loop is formed, the light-emitting diode D4 emits light to prompt the user of a battery connection error.

In various embodiments of the present invention, the battery charging control circuit includes: a switch circuit; a start circuit connected to the switch circuit, the start circuit includes a first port and a second port, when the positive electrode of the battery is connected to In the first port, the negative electrode of the battery is connected to the second port, and when the switch circuit is in an off state, the startup circuit and the battery form a first current loop, so that the startup circuit generates The start signal, wherein the current flowing through the battery is the first current; the controller is respectively connected to the switch circuit and the start circuit, and is used for delaying control of the switch circuit to be in conduction according to the start signal. The on state, so that the starting circuit, the switch circuit, and the battery form a second current loop, wherein the current flowing through the battery is a second current, and the second current is greater than the first current. The start signal is generated by the first current loop generated by the normal connection of the battery, so that the second current loop is turned on with a delay to charge the battery, and the ignition phenomenon of the battery during charging is avoided.

Please refer to FIG. 8, which is an electronic device 200 provided by an embodiment of the present invention, including a battery 300 and the aforementioned battery charging control circuit 100. The electronic device 200 is used to prevent reverse charging and ignition of the battery. The battery may be a lithium battery, a nickel-cadmium battery, or other storage batteries. The electronic device 200 includes a battery 300 and the battery charging control circuit 100 as described above, and the battery 300 is connected to the battery charging control circuit 100. The battery 300 can be used to provide power for various electronic devices, such as aircraft (such as drones, etc.), automobiles, electric bicycles, terminal devices, wearable devices, and so on.

In an embodiment of the present invention, the electronic device includes a battery and a battery charging control circuit, the battery charging control circuit includes: a switch circuit; a start circuit connected to the switch circuit, the start circuit includes a first port and a first port Two ports, when the positive pole of the battery is connected to the first port, the negative pole of the battery is connected to the second port, and the switch circuit is in the off state, the starting circuit and the battery form a first A current loop to make the starting circuit generate a starting signal, wherein the current flowing through the battery is the first current; the controller is respectively connected to the switch circuit and the starting circuit, and is used for starting according to the starting Signal, delay control the switch circuit to be in the conducting state, so that the start circuit, the switch circuit and the battery form a second current loop, wherein the current flowing through the battery is the second current, so The second current is greater than the first current. The start signal is generated by the first current loop generated by the normal connection of the battery, so that the second current loop is turned on with a delay to charge the battery, and the ignition phenomenon of the battery during charging is avoided.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; under the idea of the present invention, the technical features of the above embodiments or different embodiments can also be combined. The steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above. For the sake of brevity, they are not provided in the details; although the present invention has been described in detail with reference to the foregoing embodiments, it is common in the art The technical personnel should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the implementations of this application Examples of the scope of technical solutions.

Claims (19)

A battery charging control circuit, characterized in that it comprises: Switch circuit The starting circuit is electrically connected to the switch circuit. The starting circuit includes a first port and a second port. When the positive electrode of the battery is electrically connected to the first port, the negative electrode of the battery is electrically connected to the second port, and When the switch circuit is in the off state, the starting circuit and the battery form a first current loop, so that the starting circuit generates a starting signal, wherein the current flowing through the battery is the first current; The controller is respectively electrically connected to the switch circuit and the start circuit, and is used to delay control the switch circuit to be in the conducting state according to the start signal, so that the start circuit, the switch circuit, and the start circuit are turned on. The battery forms a second current loop, wherein the current flowing through the battery is a second current, and the second current is greater than the first current. The battery charging control circuit according to claim 1, wherein the starting circuit comprises: The first current limiting circuit includes the first port; A unidirectional conduction circuit, connected in parallel with the first current limiting circuit; A second current-limiting circuit electrically connected to the unidirectional conduction circuit, and the second current-limiting circuit includes the second port; The first trigger circuit is electrically connected to the second current limiting circuit and the controller respectively; When the positive pole of the battery is electrically connected to the first port, the negative pole of the battery is connected to the second port, and the switch circuit is in the off state, the first current limiting circuit and the second current limiting circuit A circuit, the first trigger circuit, and the battery form the first current loop, so that the first trigger circuit generates the start signal; When the positive pole of the battery is electrically connected to the first port, the negative pole of the battery is electrically connected to the second port, and the switch circuit is in a conducting state, the unidirectional conducting circuit, the battery, and the The switch circuit forms the second current loop. The battery charging control circuit according to claim 2, wherein: When the battery is not electrically connected between the first port and the second port, the second current limiting circuit and the first trigger circuit form a third current loop, wherein the first trigger The circuit did not generate the start signal. 4. The battery charging control circuit according to claim 3, wherein the first current limiting circuit comprises a first resistor; One end of the first resistor is the first port, and the other end of the first resistor is electrically connected to the second current limiting circuit and used to connect to a first power source. The battery charging control circuit according to claim 4, wherein the unidirectional conduction circuit comprises a first diode; The anode of the first diode is electrically connected to the other end of the first resistor, and the cathode of the first diode is electrically connected to the first port. The battery charging control circuit according to claim 5, wherein the second current limiting circuit comprises a second diode, a second resistor, and a third resistor; The anode of the second diode is electrically connected to the anode of the first diode, and the cathode of the second diode is electrically connected to one end of the second resistor; The other end of the second resistor is electrically connected to one end of the third resistor and the first trigger circuit; and One end of the third resistor is electrically connected to the second port, and the other end of the third resistor is grounded. 7. The battery charging control circuit of claim 6, wherein the first trigger circuit comprises a first optocoupler and a fourth resistor; One end of the primary side of the first optocoupler is electrically connected to the other end of the second resistor, the other end of the primary side of the first optocoupler is electrically connected to one end of the third resistor, and the first optocoupler is electrically connected to one end of the third resistor. One end of the secondary side is electrically connected to one end of the fourth resistor, and the other end of the secondary side of the first optocoupler is grounded; and One end of the fourth resistor is electrically connected to the controller, and the other end of the fourth resistor is used to connect to a second power source. The battery charging control circuit according to claim 6, wherein the first trigger circuit comprises a first switch tube and a fourth resistor; The control end of the first switch tube is electrically connected to the other end of the second resistor, one end of the first switch tube is electrically connected to one end of the fourth resistor, and the other end of the first switch tube is electrically connected to The second port is electrically connected; and One end of the fourth resistor is electrically connected to the controller, and the other end of the fourth resistor is used to connect to a second power source. The battery charging control circuit according to any one of claims 1 to 8, wherein: The battery charging control circuit further includes a reverse connection detection circuit, an input end of the reverse connection detection circuit is electrically connected to the second port, and an output end of the reverse connection detection circuit is electrically connected to the controller; When the positive electrode of the battery is electrically connected to the second port, the negative electrode of the battery is electrically connected to the first port, and the switch circuit is in the off state, the reverse connection detection circuit is used to respond to all The excitation of the battery generates a reverse connection detection signal, so that the controller controls the switch circuit to be in a cut-off state according to the reverse connection detection signal. The battery charging control circuit according to claim 9, wherein the reverse connection detection circuit comprises: The third current limiting circuit is electrically connected to the second port; and The second trigger circuit is electrically connected to the third current limiting circuit; When the positive pole of the battery is electrically connected to the second port, the negative pole of the battery is electrically connected to the first port, and the switch circuit is in the off state, the third current limiting circuit is connected to the first port. The two trigger circuits form a fourth current loop, so that the second trigger circuit generates a reverse connection detection signal. 11. The battery charging control circuit according to claim 10, wherein the third current limiting circuit comprises a third diode and a fifth resistor; The anode of the third diode is electrically connected to the second port, and the cathode of the third diode is electrically connected to one end of the fifth resistor; and The other end of the fifth resistor is electrically connected to the second trigger circuit and used to connect to the first power source. 11. The battery charging control circuit of claim 11, wherein the second trigger circuit comprises a second optocoupler and a sixth resistor; One end of the primary side of the second optocoupler is electrically connected to the other end of the fifth resistor, and the other end of the primary side of the second optocoupler is used to connect to the first power source. One end of the secondary side is electrically connected to one end of the sixth resistor, and the other end of the secondary side of the second optocoupler is grounded; and One end of the sixth resistor is electrically connected to the controller, and the other end of the sixth resistor is used to connect to a second power source. The battery charging control circuit according to claim 11, wherein the second trigger circuit comprises a second switch tube and a sixth resistor; The control end of the second switch tube is electrically connected to the other end of the fifth resistor, one end of the second switch tube is electrically connected to one end of the sixth resistor, and the other end of the second switch tube is used for To access the first power source; One end of the sixth resistor is electrically connected to the controller, and the other end of the sixth resistor is used to connect to a second power source. The battery charging control circuit according to claim 5, wherein: The battery charging control circuit further includes a reverse connection prompt circuit, an input end of the reverse connection prompt circuit is electrically connected to the second port, and an output end of the reverse connection prompt circuit is electrically connected to the start circuit; When the positive pole of the battery is connected to the second port, the negative pole of the battery is connected to the first port, and the switch circuit is in an off state, the reverse connection prompt circuit is used to respond to the battery The stimulus to produce a reverse connection prompt signal. The battery charging control circuit according to claim 14, wherein the reverse connection prompt circuit comprises a seventh resistor and a light emitting diode; One end of the seventh resistor is electrically connected to the second port, and the other end of the seventh resistor is electrically connected to the anode of the light emitting diode; The cathode of the light emitting diode is electrically connected to the anode of the first diode. The battery charging control circuit according to claim 6, wherein the second current limiting circuit further comprises an eighth resistor; One end of the eighth resistor is electrically connected to the other end of the second resistor, and the other end of the eighth resistor is connected to the second port. 11. The battery charging control circuit according to claim 11, wherein the third current limiting circuit further comprises a ninth resistor; One end of the ninth resistor is electrically connected to the other end of the fifth resistor, and the other end of the ninth resistor is used to connect to the first power source. The battery charging control circuit according to any one of claims 1-17, wherein the switch circuit comprises a third switch tube and a tenth resistor; The control end of the third switch tube is electrically connected to the controller, one end is grounded, and the other end is connected to the second port; One end of the tenth resistor is electrically connected to the control end of the third switch tube, and the other end of the tenth resistor is electrically connected to one end of the third switch tube. An electronic device, comprising a battery and the battery charging control circuit according to any one of claims 1-18, and the battery is connected to the battery charging control circuit.

Images