CN211266579U - Power supply control circuit and power supply equipment - Google Patents

Abstract

The power supply control circuit and the power supply device provided by the present application relate to the technical field of electronic circuits. In the present application, the power supply control circuit includes: an external interface, the external interface includes an input interface and an output interface; a transformer unit, the input end of the transformer unit is connected to the input interface, and the output end is connected to the output interface; a feedback unit, the The input end of the feedback unit is connected with the output end of the transformer unit; the control unit, the feedback end of the control unit is connected with the output end of the feedback unit, and the output end is connected with the control end of the transformer unit. Wherein, when the control unit determines through the feedback unit that the second power supply does not supply power to the electrical equipment normally, based on the voltage of the second power supply when the power supply is normal, the control unit controls the transformation unit to convert the voltage provided by the first power supply and output it to the electrical equipment . Through the above arrangement, the problem of a single power supply voltage in the power supply of the first power supply in the prior art can be improved.

Description

Power supply control circuit and power supply equipment

technical field

The present application relates to the technical field of electronic circuits, and in particular, to a power supply control circuit and a power supply device.

Background technique

In the use of some electrical equipment, in order to ensure the continuity of power supply, a backup power supply is generally configured, so that when the main power supply cannot supply power to the electrical equipment normally (for example, it cannot supply power or cannot supply power according to normal requirements), Supply power to electrical equipment.

The inventor found that, in the prior art, since the backup power supply can only output the inherent voltage when supplying power to the electrical equipment, there is a problem of a single power supply voltage.

Utility model content

In view of this, the purpose of the present application is to provide a power supply control circuit and a power supply device to improve the problem of a single power supply voltage in the power supply of the first power supply in the prior art.

To achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

A power supply control circuit, comprising:

an external interface, the external interface includes an input interface and an output interface, the input interface is used for connecting the first power supply, and the output interface is used for connecting the second power supply and the electrical equipment;

a transformer unit, the input end of the transformer unit is connected with the input interface, and the output end is connected with the output interface;

a feedback unit, the input end of the feedback unit is connected with the output end of the transformer unit;

a control unit, the feedback end of the control unit is connected with the output end of the feedback unit, and the output end is connected with the control end of the transformer unit;

Wherein, when the control unit determines through the feedback unit that the second power supply does not supply power to the electrical equipment normally, based on the voltage of the second power supply when the power supply is normally supplied, the control unit controls the transformer unit to convert the first power supply to the electrical equipment. The voltage provided by a power source is converted and output to the electrical equipment.

In a preferred choice of the embodiment of the present application, in the above-mentioned power supply control circuit, the feedback unit includes:

a voltage divider assembly, the input end of the voltage divider assembly is connected to the output end of the transformer unit, and the output end is connected to the feedback end of the control unit;

a first voltage divider control component, the input end of the first voltage divider control component is connected with the output end of the transformer unit, and the output end is connected with the output end of the voltage divider component, so as to be based on the output end of the transformer unit The voltage output from the terminal performs voltage division processing on the voltage of the output terminal of the voltage dividing component.

In a preferred choice of the embodiment of the present application, in the above-mentioned power supply control circuit, the voltage divider component includes:

a first resistor, the first end of the first resistor is used as the input end of the voltage dividing component;

A second resistor, after the first end of the second resistor is connected to the second end of the first resistor, it is used as the output end of the voltage dividing component, and the second end of the second resistor is grounded.

In a preferred choice of the embodiment of the present application, in the above-mentioned power supply control circuit, the first voltage divider control component includes:

a third resistor, the first end of the third resistor is used as the output end of the first voltage divider control component;

a first switching device, the high-potential end of the first switching device is connected to the second end of the third resistor, and the low-potential end is grounded;

a first breakdown diode, the cathode of the first breakdown diode is used as the input end of the first voltage divider control component, and the anode is connected to the control end of the first switching device;

Wherein, the first breakdown diode provides the control end of the first switching device with the voltage before and after reverse breakdown by the voltage provided by the output end of the transformer unit or the voltage provided by the second power supply Different voltage signals are used to control whether the high-potential terminal and the low-potential terminal of the first switching device are conductive.

In a preferred choice of the embodiment of the present application, in the above-mentioned power supply control circuit, the first voltage divider control component further includes:

a fourth resistor, the first end of the fourth resistor is connected to the anode of the first breakdown diode, and the second end of the fourth resistor is connected to the control end of the first switching device;

A fifth resistor, the first end of the fifth resistor is connected to the second end of the fourth resistor, and the second end of the fifth resistor is grounded.

In a preferred option of the embodiment of the present application, in the above-mentioned power supply control circuit, the feedback unit further includes at least one second voltage division control component, and each of the second voltage division control components includes:

a second breakdown diode, the cathode of the second breakdown diode is connected to the cathode of the first breakdown diode;

a second switching device, the control terminal of the second switching device is connected to the anode of the second breakdown diode, and the low potential terminal is grounded;

a sixth resistor, the first end of the sixth resistor is connected to the high potential end of the second switching device;

Wherein, the reverse breakdown voltage of the second breakdown diode is different from the reverse breakdown voltage of the first breakdown diode, so that when the voltage provided by the output end of the transformer unit is different, the The second switching device controls whether the sixth resistor adjusts the voltage of the output terminal of the voltage dividing component.

In a preferred choice of the embodiment of the present application, in the above power supply control circuit, there are multiple second voltage divider control components, and each of the second voltage divider control components includes a reverse direction of the second breakdown diode The breakdown voltage is different;

Wherein, when the voltages provided by the output ends of the transformer units are different, the number of the second breakdown diodes that are reversely broken down is different, so as to control the conduction of the second switching devices of different numbers, so that the sixth diodes of different numbers are turned on. The resistor adjusts the voltage at the output of the voltage divider assembly.

In a preferred choice of the embodiment of the present application, in the above-mentioned power supply control circuit, when there are multiple sixth resistors for adjusting the voltage of the output end of the voltage dividing component, the multiple sixth resistors are connected in series, And a plurality of the sixth resistors connected in series are connected in parallel with the third resistors.

In a preferred choice of the embodiment of the present application, in the above-mentioned power supply control circuit, the transformer unit includes:

A transformer assembly, the input end of the transformer assembly serves as the input end of the transformer unit, the output end of the transformer assembly serves as the output end of the transformer unit, and the control end of the transformer assembly serves as the transformer a control terminal of the unit, used for boosting the voltage provided by the first power supply based on the control signal of the control unit;

A filter component, which is connected to the output end of the transformer component, and is used for filtering the voltage provided by the output end of the transformer component.

On the basis of the above, an embodiment of the present application also provides a power supply device, including:

the first power supply;

a second power source, the second power source is used to supply power to the electrical equipment;

The above-mentioned power supply control circuit, the power supply control circuit is respectively connected to the first power supply, the second power supply and the electrical equipment, and is used for when the second power supply does not normally supply power to the electrical equipment, based on the The voltage when the second power supply is normally supplied is converted to the voltage provided by the first power supply and output to the electrical equipment.

The power supply control circuit and power supply device provided by the present application, through the cooperative arrangement of the transformer unit, the feedback unit and the control unit, can control the transformer unit to convert the voltage provided by the first power source when the second power source does not supply power to the electrical equipment normally. After conversion, it is output to the electrical equipment to supply power to the electrical equipment. In this way, since the control unit can control the transformer unit to perform voltage conversion based on the voltage when the second power supply is normally supplied with power, in different application environments, due to the different supply voltages of the second power supply, the power supply control circuit provided by the present application can convert the first power supply The voltage of a power supply is converted with different requirements to supply power to electrical equipment with different voltage requirements, thereby improving the problem of a single supply voltage in the power supply of the first power supply in the prior art, thereby avoiding the problem of a single supply voltage caused by a single supply voltage. The problem that the power supply can only supply power to the electrical equipment with a specific voltage requirement has high practical value.

In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic block diagram of an application of a power supply device provided by an embodiment of the present application.

FIG. 2 is a schematic block diagram of a power supply control circuit provided by an embodiment of the present application.

FIG. 3 is a schematic circuit diagram of a transformer unit provided by an embodiment of the present application.

FIG. 4 is a schematic circuit diagram of a feedback unit provided by an embodiment of the present application.

FIG. 5 is a schematic circuit diagram of a feedback unit provided by an embodiment of the present application.

FIG. 6 is a schematic circuit diagram of a plurality of second voltage division control units provided in an embodiment of the present application.

Icons: 10-power supply equipment; 20-power equipment; 100-power supply control circuit; 110-transformer unit; 111-transformer component; L1-first inductance element; Q3-third switching device; R7-seventh resistor ; D1-first diode; 113-filter component; C1-first capacitor; 120-feedback unit; 121-voltage divider component; R1-first resistor; R2-second resistor; 123-first voltage divider control Component; R3-third resistor; Q1-first switching device; ZD1-first breakdown diode; R4-fourth resistor; R5-fifth resistor; 125-second voltage divider control component; ZD2-second breakdown diode; Q2-second switching device; R6-sixth resistor; 130-control unit; 141-input interface; 143-output interface; 200-first power supply; 300-second power supply.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is only a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

As shown in FIG. 1 , an embodiment of the present application provides a power supply device 10 for supplying power to an electrical device 20 . The power supply device 10 may include a power supply control circuit 100 , a first power supply 200 and a second power supply 300 .

In detail, the first power source 200 can be used as a backup power source of the electrical equipment 20 , and the second power source 300 can be used as a main power source of the electrical equipment 20 . In this way, the second power supply 300 can be used to directly supply power to the electrical equipment 20, and the first power supply 200 can be used to supply power to the electrical equipment 20 through the The power supply control circuit 100 converts the voltage provided by the first power supply 200 and outputs it to the powered device 20 based on the voltage of the second power supply 300 when the power is normally supplied, so as to supply power to the powered device 20 .

With reference to FIG. 2 , an embodiment of the present application further provides a power supply control circuit 100 that can be applied to the above-mentioned power supply device 10 . The power supply control circuit 100 may include a transformer unit 110, a feedback unit 120, a control unit 130 and an external interface.

In detail, the external interface may include an input interface 141 and an output interface 143, the input interface 141 may be used to connect the first power supply 200 of the power supply device 10, and the output interface 143 may be used to connect the power supply device 20 and the power supply. The second power source 300 of the device 10 .

In addition, the input end of the transformer unit 110 is connected to the input interface 141, the output end is connected to the output interface 143, and the input end of the feedback unit 120 is connected to the output end of the transformer unit 110, so The feedback end of the control unit 130 is connected to the output end of the feedback unit 120 , and the output end is connected to the control end of the transformer unit 110 .

Wherein, when the control unit 130 determines through the feedback unit 120 that the second power supply 300 does not supply power to the electrical equipment 20 normally, the control unit 130 controls the transformer based on the voltage of the second power supply 300 when the power supply is normal The unit 110 converts the voltage provided by the first power source 200 and outputs it to the electrical device 20 .

Based on the above settings, since the control unit 130 can control the transformer unit 110 to perform voltage conversion based on the voltage of the second power supply 300 when the power supply is normal, in different application environments, the second power supply 300 different power supply voltages, the power supply control circuit 100 can convert the voltage of the first power supply 200 to different requirements, so as to supply power to the electrical equipment 20 with different voltage requirements, thereby improving the first power supply 200 in the prior art. There is a problem of a single power supply voltage in the power supply of the 2000A, thereby avoiding the problem that the first power supply 200 can only supply power to the electrical equipment 20 with a specific voltage requirement due to the single power supply voltage.

For example, in an alternative example, the rated working voltage of the electrical device 20 is 24V, and the voltage of the second power supply 300 is 24V during normal power supply. If the control unit 130 is passing the feedback unit 120 determines that the current power supply of the second power supply 300 is less than 24V, and can control the transformer unit 110 to convert the voltage provided by the first power supply 200 to 24V and then output it to the electrical device 20 to replace the second power supply 200. The power supply 300 supplies power to the powered device 20 .

Wherein, when the rated working voltage of the electrical equipment 20 is upgraded from the above-mentioned 24V to 36V, since the voltage of the second power supply 300 during normal power supply will also correspondingly change to 36V, therefore, if the control unit 130 is in It is determined by the feedback unit 120 that the current power supply of the second power supply 300 is less than 36V, and the transformer unit 110 can be controlled to convert the voltage provided by the first power supply 200 to 36V and then output it to the electrical device 20 to Instead of the second power source 300 , power is supplied to the powered device 20 .

Based on this, when the rated working voltage of the electrical equipment 20 is 24V, the first power supply 200 can provide the electrical equipment with a voltage of 24V through the transformer unit 110; When the rated working voltage is upgraded to 36V, the first power supply 200 can provide the electrical device 20 with a voltage of 36V through the transformer unit 110 . In this way, automatic switching of different gear voltages can be performed based on different power supply requirements.

In the first aspect, it should be noted that the transformer unit 110 has a specific structure that is not limited, and can be selected according to actual application requirements.

For example, in an alternative example, the voltage provided by the first power supply 200 needs to be stepped down before outputting, such as converting a voltage of 54V into 36V or 24V for output.

For another example, in another alternative example, the voltage provided by the first power supply 200 needs to be bucked or boosted before output, such as converting a 54V voltage into 36V or 24V output, or 54V The voltage is converted to 100V output.

For another example, in another alternative example, considering that in many practical applications, the voltage provided by the first power supply 200 is generally lower than the voltage of the powered device 20 , therefore, with reference to FIG. 3 , the The transformation unit 110 may include a transformation component 111 and a filter component 113 .

Wherein, the input end of the transformer assembly 111 can be used as the input end of the transformer unit 110 to be connected to the input interface 141 . The output end of the transformer assembly 111 can be used as the output end of the transformer unit 110 and is connected to the output interface 143 . The control end of the transformer assembly 111 can be used as the control end of the transformer unit 110 and is connected to the output end of the control unit 130 . In this way, the transformer component 111 can be used to boost the voltage provided by the first power source 200 based on the control signal of the control unit 130 .

In addition, the filtering component 113 is connected to the output end of the transformer component 111, and is used for filtering the voltage provided by the output end of the transformer component 111, so as to improve the stability of the voltage output through the output end.

Optionally, the number and types of electrical components included in the transformer assembly 111 are not limited, and can be selected according to actual application requirements.

For example, in an alternative example, the transformer assembly 111 may include a transformer to perform the boosting process based on the transformer.

For another example, in another alternative example, the transformer component 111 may include a first inductance element L1 , a third switching device Q3 , a seventh resistor R7 and a first diode D1 .

In detail, the first end of the first inductance element L1 can be used as the input end of the transformer component 111 and is connected to the input interface 141 . The high-potential end of the third switching device Q3 is connected to the second end of the first inductance element L1, and the control end of the third switching device Q3 can be used as the control end of the transformer component 111, which is connected to the second end of the first inductance element L1. The output terminal of the control unit 130 is connected. The first end of the seventh resistor R7 is connected to the low potential end of the third switching device Q3, and the second end of the seventh resistor R7 is grounded. The anode of the first diode D1 is connected to the second end of the first inductance element L1, and the cathode of the first diode D1 can be used as the output end of the transformer component 111, and the output The interface 143 is connected.

In this way, the control unit 130 can control the third switching device Q3 to be turned on and off alternately, so that the first inductance element L1 can generate an induced voltage, and the induced voltage is the same as the voltage provided by the first power supply 200 After the superposition, the output is output through the output end of the transformer component 111, so as to realize the boosting process.

In addition, the first diode D1 can be used to avoid reverse charging of the first power supply 200 when the second power supply 300 normally supplies power to the electrical device 20 .

The specific type of the third switching device Q3 is not limited, and can be selected according to actual application requirements, for example, it can be an N-type MOS transistor with lower on-power consumption.

Optionally, the number and type of electrical components of the filter assembly 113 are not limited, and can be selected according to actual application requirements. For example, in an alternative example, the filtering component 113 may include a first capacitor C1.

Wherein, the first end of the first capacitor C1 can be connected to the output end of the transformer component 111 (eg, the cathode of the first diode D1 described above), for providing the output end of the transformer assembly 111 with The voltage is filtered.

In the second aspect, it should be noted for the feedback unit 120 that the specific structure of the feedback unit 120 is not limited, and can be selected according to actual application requirements.

For example, in an alternative example, if only the voltage output by the output end of the transformer unit 110 needs to be directly fed back to the control unit 130, the control unit 130 may include a voltage division control component.

For another example, in another alternative example, in order to avoid the problem that the control unit 130 is damaged by a large voltage, with reference to FIG. 4 , the feedback unit 120 may include a voltage dividing component 121 and a first voltage dividing control component 123 .

In detail, the input end of the voltage dividing component 121 is connected to the output end of the transformer unit 110 , and the output end is connected to the feedback end of the control unit 130 . The input end of the first voltage dividing control component 123 is connected to the output end of the transformer unit 110 , and the output end is connected to the output end of the voltage dividing component 121 , so as to output an output terminal based on the output end of the transformer unit 110 . The voltage at the output terminal of the voltage dividing component 121 is subjected to voltage division processing.

Wherein, the first voltage divider control component 123 can control the output end of the voltage divider component 121 to output different voltages based on whether the output voltage of the output end of the transformer unit 110 is greater than a preset voltage, so that the feedback The unit 120 may acquire different voltage signals, and then perform corresponding voltage division processing on the voltage transformation unit 110 based on the voltage signals.

For example, in combination with the foregoing examples, the rated working voltage of the electrical device 20 is 24V, and the voltage of the second power supply 300 is 24V during normal power supply. The current power supply of the second power supply 300 is less than 24V (eg, 12V), that is, the transformer unit 110 is currently not working, and the output voltage of the output terminal of the transformer unit 110 is the voltage of the second power source 300 , eg, 12V. At this time, the control unit 130 may control the transformer unit 110 to perform boosting processing on the voltage provided by the second power supply 300 and output the voltage.

Wherein, in order to avoid the problem that the control unit 130 is damaged by supplying an excessively high voltage to the control unit 130 due to the boosting process, the voltage output at the output end of the transformer unit 110 rises to the preset value. When the voltage is low, the first voltage dividing control component 123 can control the output end of the voltage dividing component 121 to provide a fixed feedback voltage to the control unit 130 .

For example, in a specific application example, combined with the foregoing example, the preset voltage is 30V, and the output voltage at the output end of the transformer unit 110 is less than 30V, and the control unit 130 can continuously control the The voltage transformation unit 110 performs a boosting process, so that the voltage of the output terminal of the voltage dividing component 121 also continues to rise. After a period of boosting processing, if the output voltage of the output terminal of the transformer unit 110 is equal to 30V, the first voltage dividing control component 123 may divide the voltage of the output terminal of the voltage dividing component 121 processing to stabilize the voltage of the output terminal of the voltage dividing component 121 at a fixed value (eg, a fixed feedback voltage value of the control unit 130 ), so as to avoid the problem of the control unit 130 being damaged.

Optionally, the type and quantity of electrical components included in the voltage dividing component 121 are not limited, and can be selected according to actual application requirements.

For example, in an alternative example, the voltage dividing component 121 may include a first resistor R1 and a second resistor R2. The first end of the first resistor R1 serves as the input end of the voltage dividing component 121 and is connected to the output end of the voltage transforming component. After the first end of the second resistor R2 is connected to the second end of the first resistor R1 , it serves as the output end of the voltage dividing component 121 and is connected to the feedback end of the control unit 130 . In addition, the second end of the second resistor R2 is grounded.

In this way, after the voltage output from the output terminal of the transformer unit 110 is applied to the first resistor R1 and the second resistor R2, based on the voltage division of the first resistor R1 and the second resistor R2, The voltage across the second resistor R2 is output to the feedback terminal of the control unit 130 .

In a specific application example, based on the foregoing example, if the voltage of the feedback terminal of the control unit 130 needs to be stabilized at 24V, and when the output voltage of the output terminal of the transformer unit 110 is less than 30V, the first The voltage dividing ratio between the first resistor R1 and the second resistor R2 is 1:5. In this way, when the voltage output by the output terminal of the transformer unit 110 rises to 30V, based on the voltage dividing ratio of 1:5, the voltage value across the second resistor R2 is 25V (greater than 24V). At this time, since the output voltage of the output terminal of the transformer unit 110 is equal to 30V, the first voltage division control component 123 can adjust the voltage division ratio of the first resistor R1 and the second resistor R2, The adjusted voltage divider ratio is 1:4. In this way, a voltage of 24V can be provided to the feedback terminal of the control unit 130 .

Optionally, the type and quantity of electrical components included in the first voltage division control assembly 123 are also not limited, and can be selected according to actual application requirements.

For example, in an alternative example, the first voltage dividing control component 123 may include a third resistor R3, a first switching device Q1 and a first breakdown diode ZD1.

In detail, the first end of the third resistor R3 can be used as the output end of the first voltage dividing control component 123, and is connected to the output end of the voltage dividing component 121 (such as the first end of the second resistor R2 described above). ). The high potential terminal of the first switching device Q1 is connected to the second terminal of the third resistor R3, and the low potential terminal is grounded. The cathode of the first breakdown diode ZD1 can be used as the input end of the first voltage divider control component 123 to be connected to the output end of the transformer unit 110 . In addition, the anode of the first breakdown diode ZD1 is connected to the control terminal of the first switching device Q1.

Wherein, before and after reverse breakdown of the voltage provided by the output end of the transformer unit 110 or the voltage provided by the second power supply 300, the first breakdown diode ZD1 is directed to the first switching device Q1 The control terminal of the Q1 provides different voltage signals to control whether the connection between the high-potential terminal and the low-potential terminal of the first switching device Q1 is conducted.

For example, in a specific application example, combined with the foregoing examples, the reverse breakdown voltage of the first breakdown diode ZD1 is 30V. If the voltage at the output end of the transformer unit 110 or the second power supply The voltage provided by 300 rises to 30V, which will cause the first breakdown diode ZD1 to be reversely broken down, so as to provide a high level to the control terminal of the first switching device Q1, so that the high level of the first switching device Q1 The potential terminal and the low potential terminal are electrically connected, so that the voltage dividing ratio between the second resistor R2 and the first resistor R1 is adjusted based on the shunting of the second resistor R2 by the third resistor R3.

The specific type of the first switching device Q1 is not limited, and can be selected according to actual application requirements. For example, in an alternative example, the first switching device Q1 may be an N-type MOS transistor with lower on-resistance.

In addition, in some examples, in order to avoid the problem that the voltage provided by the first breakdown diode ZD1 that is broken down is too high to cause damage to the first switching device Q1, the first voltage divider control component 123 may further include: The fourth resistor R4 and the fifth resistor R5.

In detail, the first end of the fourth resistor R4 is connected to the anode of the first breakdown diode ZD1, and the second end of the fourth resistor R4 is connected to the control end of the first switching device Q1. The first end of the fifth resistor R5 is connected to the second end of the fourth resistor R4, and the second end of the fifth resistor R5 is grounded. In this way, based on the voltage division between the fourth resistor R4 and the fifth resistor R5, the voltage across the fifth resistor R5 can be applied to the first switching device Q1 to control the high voltage of the first switching device Q1 Conduction between the potential terminal and the low potential terminal.

Further, in order to improve the voltage conversion capability of the power supply control circuit 100 to the first power supply 200, so that different voltages can be output based on different requirements, in this embodiment, in conjunction with FIG. 5, the feedback unit 120 further A second partial pressure control assembly 125 may be included.

In detail, the second voltage dividing control component 125 may include a second breakdown diode ZD2, a second switching device Q2 and a sixth resistor R6. Wherein, the cathode of the second breakdown diode ZD2 is connected to the cathode of the first breakdown diode ZD1, the control terminal of the second switching device Q2 is connected to the anode of the second breakdown diode ZD2, and the low potential The terminal is grounded, and the first terminal of the sixth resistor R6 is connected to the high potential terminal of the second switching device Q2.

In addition, the reverse breakdown voltage of the second breakdown diode ZD2 is different from the reverse breakdown voltage of the first breakdown diode ZD1, so that when the voltage provided by the output end of the transformer unit 110 is different, Whether the sixth resistor R6 adjusts the voltage of the output terminal of the voltage dividing component 121 is controlled by the second switching device Q2.

For example, in a specific application example, combined with the foregoing examples, the reverse breakdown voltage of the first breakdown diode ZD1 is 30V, and the reverse breakdown voltage of the second breakdown diode ZD2 is 36V.

If the voltage provided by the output terminal of the transformer unit 110 is 30V, the first breakdown diode ZD1 is reversely broken down, the second breakdown diode ZD2 is not reversely broken down, and the first switch The high-potential end and the low-potential end of the device Q1 are turned on, and the high-potential end and the low-potential end of the second switching device Q2 are turned off, so that the third resistor R3 conducts the second resistor R2 Shunt, the sixth resistor R6 does not shunt the second resistor R2.

If the voltage provided by the output terminal of the transformer unit 110 is 36V, the first breakdown diode ZD1 is reversely broken down, the second breakdown diode ZD2 is reversely broken down, and the first switching device The high-potential end and the low-potential end of Q1 are conductive, and the high-potential end and the low-potential end of the second switching device Q2 are conductive, so that the third resistor R3 shunts the second resistor R2 . The sixth resistor R6 shunts the second resistor R2.

It can be understood that, in the above example, in the second voltage divider control component 125, in order to prevent the second switching device Q2 from being damaged, the second voltage divider control component 125 may further include two resistors (such as R01 and R02) shown in FIG. 5 are used to provide a driving voltage to the second switching device Q2 after voltage division.

Optionally, the number of the second voltage division control components 125 is not limited, and can be selected according to actual application requirements.

For example, in an alternative example, the second voltage division control component 125 may be one. For another example, in another alternative example, there may be multiple second voltage division control components 125 .

Wherein, there are a plurality of the second voltage division control components 125 , and the reverse breakdown voltages of the second breakdown diodes ZD2 included in each of the second voltage division control components 125 are different. In this way, when the voltages provided by the output terminals of the transformer unit 110 are different, the numbers of the second breakdown diodes ZD2 that are reversely broken down are different, so as to control the conduction of the second switching devices Q2 of different numbers, so that different numbers of the second breakdown diodes ZD2 are turned on. The sixth resistor R6 adjusts the voltage of the output terminal of the voltage dividing component 121 .

For example, in a specific application example, the number of the second voltage divider control components 125 is three. In combination with the foregoing examples, the reverse breakdown voltage of the first breakdown diode ZD1 is 30V, and the first breakdown diode ZD1 has a reverse breakdown voltage of 30V. The reverse breakdown voltage of the second breakdown diode ZD2 is 36V, the reverse breakdown voltage of the second second breakdown diode ZD2 is 40V, and the reverse breakdown voltage of the third second breakdown diode ZD2 is 48V.

If the voltage provided by the output terminal of the transformer unit 110 is 30V, the first breakdown diode ZD1 is reversely broken down, and the three second breakdown diodes ZD2 are not reversely broken down, and the first breakdown diode ZD2 is not reversely broken down. The high-potential terminal and the low-potential terminal of one switching device Q1 are turned on, and the high-potential terminals and low-potential terminals of the three second switching devices Q2 are all turned off, so that the third resistor R3 The second resistor R2 performs shunt, and none of the three sixth resistors R6 shunts the second resistor R2.

If the voltage provided by the output terminal of the transformer unit 110 is 36V, the first breakdown diode ZD1 and the first second breakdown diode ZD2 are reverse breakdown, the second breakdown diode and the third breakdown diode ZD2 The through diode ZD2 is not broken down in the reverse direction, the high potential end and the low potential end of the first switching device Q1 and the first second switching device Q2 are conductive, and the second and third second switching devices Both the high potential terminal and the low potential terminal of Q2 are turned off, so that the third resistor R3 and the first sixth resistor R6 both shunt the second resistor R2, and the second and third sixth resistors Neither of the resistors R6 shunts the second resistor R2.

If the voltage provided by the output terminal of the transformer unit 110 is 48V, the first breakdown diode ZD1 and the three second breakdown diodes ZD2 are reversely broken down, and the first switching device Q1 and the three Both the high-potential end and the low-potential end of the second switching device Q2 are turned on, so that the third resistor R3 and the three sixth resistors R6 all shunt the second resistor R2.

It can be understood that when there are two or more (that is, multiple) sixth resistors R6 to shunt the second resistor R2, the relative connection relationship between the sixth resistors R6 is not limited, It can be selected according to actual application requirements.

For example, in an alternative example, the two or more sixth resistors R6 may be connected in parallel, so that the two or more sixth resistors R6 and the second resistor R2 are respectively form a parallel connection.

For another example, in another alternative example, referring to FIG. 6 , the two or more sixth resistors R6 may be connected in series, so that after the two or more sixth resistors R6 are connected in series , and then connected in parallel with the second resistor R2.

In the third aspect, it should be noted for the control unit 130 that the specific structure of the control unit 130 is not limited, and can be selected according to actual application requirements.

For example, in an alternative example, the control unit 130 may be a switching power supply chip, and a voltage feedback pin (FB pin) of the switching power supply chip may be used as a feedback terminal of the control unit 130 .

In summary, the power supply control circuit 100 and the power supply device 10 provided by the present application, through the cooperative arrangement of the transformer unit 110 , the feedback unit 120 and the control unit 130 , can be used when the second power supply 300 does not normally supply power to the electrical device 20 . , control the transformer unit 110 to convert the voltage provided by the first power source 200 and output it to the electrical equipment 20 to supply power to the electrical equipment 20 . In this way, since the control unit 130 can control the voltage transformation unit 110 to perform voltage conversion based on the voltage of the second power supply 300 when the power supply is normal, in different application environments, due to the different supply voltages of the second power supply 300, the power supply control provided by the present application The circuit 100 can convert the voltage of the first power supply 200 to different requirements, so as to supply power to the electrical equipment 20 with different voltage requirements, thereby improving the problem of a single supply voltage in the power supply of the first power supply 200 in the prior art, thereby avoiding the problem of single supply voltage. Due to the single power supply voltage, the first power supply 200 can only supply power to the electrical equipment 20 with a specific voltage requirement, which has high practical value.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. A power supply control circuit, characterized in that, comprising: an external interface, the external interface includes an input interface and an output interface, the input interface is used for connecting the first power supply, and the output interface is used for connecting the second power supply and the electrical equipment; a transformer unit, the input end of the transformer unit is connected with the input interface, and the output end is connected with the output interface; a feedback unit, the input end of the feedback unit is connected with the output end of the transformer unit; a control unit, the feedback end of the control unit is connected with the output end of the feedback unit, and the output end is connected with the control end of the transformer unit; Wherein, when the control unit determines through the feedback unit that the second power supply does not supply power to the electrical equipment normally, based on the voltage of the second power supply when the power supply is normally supplied, the control unit controls the transformer unit to convert the first power supply to the electrical equipment. The voltage provided by a power source is converted and output to the electrical equipment. 2. The power supply control circuit according to claim 1, wherein the feedback unit comprises: a voltage divider assembly, the input end of the voltage divider assembly is connected to the output end of the transformer unit, and the output end is connected to the feedback end of the control unit; a first voltage divider control component, the input end of the first voltage divider control component is connected with the output end of the transformer unit, and the output end is connected with the output end of the voltage divider component, so as to be based on the output end of the transformer unit The voltage output from the terminal performs voltage division processing on the voltage of the output terminal of the voltage dividing component. 3. The power supply control circuit according to claim 2, wherein the voltage dividing component comprises: a first resistor, the first end of the first resistor is used as the input end of the voltage dividing component; A second resistor, after the first end of the second resistor is connected to the second end of the first resistor, it is used as the output end of the voltage dividing component, and the second end of the second resistor is grounded. 4. The power supply control circuit according to claim 2, wherein the first voltage division control component comprises: a third resistor, the first end of the third resistor is used as the output end of the first voltage divider control component; a first switching device, the high-potential end of the first switching device is connected to the second end of the third resistor, and the low-potential end is grounded; a first breakdown diode, the cathode of the first breakdown diode is used as the input end of the first voltage divider control component, and the anode is connected to the control end of the first switching device; Wherein, the first breakdown diode provides the control end of the first switching device with the voltage before and after reverse breakdown by the voltage provided by the output end of the transformer unit or the voltage provided by the second power supply Different voltage signals are used to control whether the high-potential terminal and the low-potential terminal of the first switching device are conductive. 5. The power supply control circuit according to claim 4, wherein the first voltage divider control component further comprises: a fourth resistor, the first end of the fourth resistor is connected to the anode of the first breakdown diode, and the second end of the fourth resistor is connected to the control end of the first switching device; A fifth resistor, the first end of the fifth resistor is connected to the second end of the fourth resistor, and the second end of the fifth resistor is grounded. 6 . The power supply control circuit according to claim 4 , wherein the feedback unit further comprises a second voltage dividing control component, and the second voltage dividing control component comprises: 6 . a second breakdown diode, the cathode of the second breakdown diode is connected to the cathode of the first breakdown diode; a second switching device, the control terminal of the second switching device is connected to the anode of the second breakdown diode, and the low potential terminal is grounded; a sixth resistor, the first end of the sixth resistor is connected to the high potential end of the second switching device; Wherein, the reverse breakdown voltage of the second breakdown diode is different from the reverse breakdown voltage of the first breakdown diode, so that when the voltage provided by the output end of the transformer unit is different, the The second switching device controls whether the sixth resistor adjusts the voltage of the output terminal of the voltage dividing component. 7 . The power supply control circuit according to claim 6 , wherein there are multiple second voltage division control components, and each of the second voltage division control components includes a reverse strike of a second breakdown diode. 8 . The breakdown voltage is different; Wherein, when the voltages provided by the output ends of the transformer units are different, the number of the second breakdown diodes that are reversely broken down is different, so as to control the conduction of the second switching devices of different numbers, so that the sixth diodes of different numbers are turned on. The resistor adjusts the voltage at the output of the voltage divider assembly. 8 . The power supply control circuit according to claim 7 , wherein when there are multiple sixth resistors for adjusting the voltage of the output end of the voltage dividing component, a plurality of the sixth resistors are connected in series, and A plurality of the sixth resistors connected in series are connected in parallel with the third resistors. 9. The power supply control circuit according to any one of claims 1-8, wherein the transformer unit comprises: A transformer assembly, the input end of the transformer assembly serves as the input end of the transformer unit, the output end of the transformer assembly serves as the output end of the transformer unit, and the control end of the transformer assembly serves as the transformer a control terminal of the unit, used for boosting the voltage provided by the first power supply based on the control signal of the control unit; A filter component, which is connected to the output end of the transformer component, and is used for filtering the voltage provided by the output end of the transformer component. 10. A power supply device, comprising: the first power supply; a second power source, the second power source is used to supply power to the electrical equipment; The power supply control circuit according to any one of claims 1 to 9, the power supply control circuit is respectively connected to the first power supply, the second power supply and the electrical device, for use when the second power supply is not connected to the power supply. When the electrical equipment is normally powered, the voltage provided by the first power source is converted and output to the electrical equipment based on the voltage when the second power source is normally powered.

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