WO2019196517A1 - Aerosol generating device and electric circuit thereof - Google Patents

Abstract

Provided are an aerosol generating device (100) and an electric circuit thereof: a voltage drop stabilizing circuit and an output end of the voltage drop stabilizing circuit, wherein the aerosol generating device (100) output end is used for outputting a constant voltage lower than the heating voltage of a heating element when the resistance of the heating element is detected. The aerosol generating device (100) circuit exhibits an improved accuracy when detecting the resistance of a heating element.

Description

Aerosol generating device and circuit thereof Technical field

The utility model relates to an aerosol generating device and a circuit thereof.

Background technique

The aerosol generating system, also known as electronic cigarette, is a product that allows users to use nicotine and other substances by steaming or heating.

A common electronic cigarette is usually divided into two parts: a suction rod part (including a suction rod sleeve and an atomizer housed in the suction rod sleeve, a storage tank, etc.), and a battery rod part (including a battery rod sleeve and a battery holder). The control circuit and battery in the pole cover). The rod sleeve and the battery rod sleeve are typically threaded to form an overall electronic cigarette of equal or substantially equal overall.

In the prior art, there are many circuits of the following electronic cigarettes: when heating, the second semiconductor switch tube is turned on by the first semiconductor switch tube to turn off, so that the resistance wire is electrically connected to the heating circuit, and the output voltage of the battery is opposite. The resistance wire is heated; when it is required to detect the resistance of the resistance wire, the first semiconductor switch tube turns off the second semiconductor switch tube to be turned on, so that the resistance wire is connected to the detection circuit, and the output voltage of the battery passes through a large resistance value. The current limiting resistor supplies power to the resistance wire, so that the voltage detecting circuit detects the voltage of the resistance wire, and finally calculates the resistance value of the resistance wire.

Utility model content

However, in the prior art, when detecting the resistance of the resistance wire, it is necessary to ignore the on-resistance of the switching tube, thereby causing an error in the detection result. In order to overcome the deficiencies in the prior art, the present invention provides an aerosol generating device and an electric circuit thereof.

An electric circuit for generating an aerosol generating device, comprising: a buck-type voltage stabilizing circuit; an output end of the buck-type voltage stabilizing circuit is electrically connected to a heating element of the aerosol generating device; and the output end is used at a detecting station The resistance of the heating member outputs a stable voltage lower than the heating voltage of the heating member.

The circuit also includes a heating switch; the heating voltage supplies power to the heating element through the heating switch.

The output is for not outputting a voltage when the resistance of the heating element is not detected.

The circuit further includes a reference resistor; the output is electrically coupled to the heating element through the reference resistor.

The buck regulator circuit is a buck regulator chip, and the buck regulator chip includes an enable terminal, and the enable terminal is configured to receive an enable signal when detecting a resistance of the heating component; The buck regulator chip is configured to control whether the output terminal outputs a voltage according to an enable signal.

The circuit further includes a first electrode and a second electrode, the two terminals of the heating member being respectively for electrically connecting with the first electrode and the second electrode.

The circuit further includes a voltage detecting circuit; the second electrode is grounded, and the voltage detecting circuit is configured to detect a voltage of the first electrode.

The heating switch includes a P-channel switch tube and an N-channel switch tube; a first end of the P-channel switch tube is electrically connected to a heating voltage, and a second end is electrically connected to the first electrode; the N-channel switch The first end of the tube is electrically connected to the heating voltage and the control end of the P-channel switch tube, and the second end is grounded.

The utility model also provides an aerosol generating device, comprising a heating switch and a microprocessor, further comprising a step-down type voltage stabilizing chip and a reference resistor; and a heating voltage to the heating element of the aerosol generating device through the heating switch Power supply; the buck regulator chip includes an enable end and an output end, the output end is electrically connected to the heating element; the enable end is connected to a first signal output end of the microprocessor, The microprocessor is configured to output an enable signal at the first signal output end when detecting the resistance of the heating element; the output end is configured to output a lower than the heating voltage when the enable end receives the enable signal Stabilize the voltage.

The heating switch includes a P-channel switch tube and an N-channel switch tube; a first end of the P-channel switch tube is electrically connected to a heating voltage, and a second end is electrically connected to the first electrode; the N-channel switch The first end of the tube is electrically connected to the heating voltage and the control end of the P-channel switch tube, the second end is grounded, and the control end of the N-channel switch tube is connected to the second signal output end of the microprocessor .

The aerosol generating device further includes a first electrode, a second electrode, and a voltage detecting circuit; two terminals of the heating member are respectively connected to the first electrode and the second electrode; and the second electrode is grounded The voltage detecting circuit is configured to detect a voltage of the first electrode.

The output of the buck regulator circuit outputs a stable voltage lower than the voltage of the detection circuit voltage and the heating voltage to the heating element to detect the resistance of the heating element, thereby avoiding the presence of the on-resistance of the semiconductor switching tube. The detection error is therefore more accurate.

DRAWINGS

1 is a circuit block diagram of an embodiment of an aerosol generating device of the present invention;

Figure 2 shows a heating and detecting circuit of the existing electronic cigarette;

3 is a circuit block diagram of another embodiment of the aerosol generating device of the present invention;

4 is a schematic diagram of an embodiment of an aerosol generating system of the present invention.

detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The aerosol-generating matrix refers to a substance which can be mixed with air under certain conditions to form an aerosol, which may be in a liquid state or in a solid state. For a liquid aerosol generating matrix, it is usually necessary to volatilize the aerosol generating matrix into a gas under heating conditions, and after the temperature drops to a certain temperature, the aerosol matrix gas condenses in the air to form an aerosol. The composition of the aerosol-forming matrix in liquid form comprises heating a volatile fuming oil, which may include glycerol (glycerol), propylene glycol, flavor (or fragrance) and nicotine (nicotine), among the above-mentioned cigarette oils, nicotine and / or flavor can be replaced by tobacco extract. Smoke oil may also not contain nicotine.

As shown in FIG. 1 , it is a circuit block diagram of an embodiment of an aerosol generating device. The aerosol generating device includes a heating switch, a buck regulator circuit, a reference resistor, a first electrode P1, a second electrode P2, and a voltage detecting circuit. , heating parts.

One end of the heating member is electrically connected to the first electrode P1, and the other end is electrically connected to the second electrode P2, thereby being inserted into the circuit. The buck regulator circuit is used to step down the voltage of the detection circuit to output a stable voltage lower than the voltage of the detection circuit. The heating voltage is electrically connected to the heating member through the heating switch; the output end of the step-down voltage regulator circuit is electrically connected to the heating member through the reference resistor. When detecting the resistance of the heating member, the step-down regulator circuit is for outputting a stable voltage Vo lower than the voltage of the detection circuit voltage and the heating voltage at the output terminal.

When the heating element needs to be heated, the heating switch is controlled to be turned on (at this time, the step-down voltage regulator circuit can output a stable voltage or not to output a voltage), and the heating voltage supplies power to the heating member, so that the heating element generates heat, thereby generating gas. Sol. When it is necessary to detect the resistance of the heating member, the step-down regulator circuit is controlled to output a stable voltage Vo, while the heater switch is controlled to be turned off, and the stable voltage supplies power to the heating member via the reference resistor R0. The voltage detecting circuit detects the voltage V across the heating member. In one embodiment, when the second electrode P2 is grounded, the voltage detecting circuit detects the voltage of the first electrode P1 as the voltage across the heating member.

The resistance Rx between the first electrode P1 and the second electrode P2 can be calculated according to the following formula: Rx = VR0 / (Vo - V).

The step-down voltage stabilizing circuit outputs a stable voltage Vo lower than the voltage of the detecting circuit voltage and the heating voltage, and the first electrode P1 and the second electrode which are detected can be detected while reducing the current flowing through the heating member while reducing the detecting resistance. The resistance Rx between P2 (including the resistance of the heating element) is more precise. For example as shown in FIG. 2, an electronic cigarette is a conventional heating resistance detection circuit and, when necessary to heat the heating element _{(heating element} corresponding to R) to generate an aerosol, _heating control MOS switch Q is turned on and MOS switch Q _detection off, the current through the _{heating element} R and Q _heating; R need to detect when the _{heating element,} the _heating control Q and Q _detection is turned OFF, the current through _{the heating element} R, _{the reference resistance} R, Q _heating, by ignoring the resistance _detected Q Size, calculate the R _{heating element} according to the formula. However, since the on-resistance of the Q _detection is neglected, a large error occurs in the detection result. Especially in some cases, the heating current of the heating element is very large (for example, at 1-4A), and the resistance of the heating element changes by mΩ (for example, 1-1.35 Ω) as the temperature of the heating element changes during heating. However, the on-resistance of the MOS tube is also in the range of tens to hundreds of mΩ, or even larger, so the detection method in FIG. 2 brings a large detection error. The scheme shown in Figure 1 can avoid the error of this detection result, because the additional resistance brought by such a switch tube is not introduced in the calculation process.

As shown in Figure 3, it is a circuit schematic of a more specific embodiment of an aerosol generating device.

The aerosol generating device also includes a microprocessor (MCU). The buck regulator circuit is a buck regulator chip, the buck regulator chip includes an enable terminal EN, and the enable terminal EN is connected to the first signal output end of the microprocessor to receive the first control signal (even if the signal is available) The microprocessor outputs an enable signal at the first signal output when detecting the resistance of the heating element. When the enable end receives the enable signal (for example, when receiving a high level), the output of the output is lower than the heating. The voltage and the stable voltage of the detection circuit voltage; when the enable terminal does not receive the enable signal (for example, when a low level is received), the output terminal does not output a voltage. The detection circuit voltage and the heating voltage may be the same or different values. In the present embodiment, both are the battery voltage V _{BAT of the} aerosol generating device. The output terminal of the buck regulator chip is electrically connected to the first electrode P1 through a reference resistor R _{reference resistor} .

The heating switch comprises a P-channel switch tube Q2 and an N-channel switch tube Q1; the first end of the P-channel switch tube Q2 is electrically connected to the heating voltage V _BAT , the second end is electrically connected to the first electrode P1; and the N-channel switch tube Q1 The first end is electrically connected to the heating voltage V _BAT and the control end of the P-channel switch tube, the second end is grounded, and the control end of the N-channel switch tube Q1 is connected to the second signal output end of the microprocessor to receive the second control signal. The P-channel switching transistor and the N-channel switching transistor may be MOS transistors or triodes.

In a more specific embodiment, the control terminal of the P-channel switch Q2 and the common terminal of the N-channel switch Q1 are connected to V _BAT through a resistor R1, and the second control signal is input to the control terminal of Q1 through the resistor R2, and the resistor R3 is crossed. Connected between the control terminal of Q1 and ground, the voltage detecting circuit is connected to the first electrode P1 through the resistor R4.

The voltage detecting circuit may include an amplifying circuit and an AD converting circuit. After the amplifying circuit amplifies the voltage, the analog voltage is converted into a digital signal by the AD converting circuit, and finally the voltage is detected by the microprocessor, and finally the first electrode P1 and the first electrode are calculated. The resistance between the two electrodes P2. The AD conversion circuit can be separate from the microprocessor or integrated inside the microprocessor.

When the heating element needs to be heated, the second control signal outputs a high level control Q1 is turned on, the control end of Q2 is pulled to a low level, so that Q2 is turned on, and the heating voltage V _BAT supplies power to the heating element, so that the heating element It generates heat and produces an aerosol. When it is necessary to detect the resistance of the heating element, the first control signal enables the buck regulator chip, the buck regulator chip outputs a stable voltage Vo, and the second control signal outputs a low level (Q1 is turned off and causes Q2 is turned off), and the regulated voltage supplies power to the heating element via the reference resistor R0.

It should be noted that the heating element may be disposed in the aerosol generating device or may be disposed in the aerosol generating article.

As shown in FIG. 4, it is a schematic structural view of an embodiment of an aerosol generating system. The aerosol generating system includes an aerosol generating device 100 and a disposable aerosol generating article 200 that cooperates with the aerosol generating device 100.

The disposable aerosol-generating article 200 includes a heating member, an oil guiding member, an oil storage assembly, an inner electrode sheet of the product, and an outer electrode sheet of the product. One end of the heating member is electrically connected to the electrode piece in the product, and the other end is electrically connected to the outer electrode piece of the product, and the heating member forms physical contact with the oil guiding member. The oil guiding member is for adsorbing the liquid aerosol generating substrate flowing out from the oil storage assembly, and the oil guiding member may be a material having liquid adsorption ability such as cotton, fiber or porous material.

The aerosol generating device 100 further includes a device housing 110, and a battery disposed within the device housing 110, an internal electrode of the device (eg, the second electrode P2), and an external electrode of the device (eg, the first electrode P1). The device housing 110 is provided with a receiving chamber for inserting the disposable aerosol-generating article 200, and the inner electrode of the device and the outer electrode of the device are located at the bottom of the receiving chamber.

When the disposable aerosol-generating article 200 is inserted into the receiving chamber, the outer electrode of the device is electrically connected to the outer electrode sheet of the product, and the inner electrode of the device is in contact with and electrically connected to the electrode sheet in the article, so that the heating member is inserted into the circuit of the aerosol generating device.

It should be understood that the above preferred embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting, and those skilled in the art may modify the technical solutions described in the above preferred embodiments, or All of the technical features are equivalently replaced; all such modifications and substitutions are intended to fall within the scope of the appended claims.

Claims (11)

A circuit for an aerosol generating device, comprising: a buck regulator circuit; An output end of the buck regulator circuit is electrically connected to a heating element of the aerosol generating device; The output is for outputting a stable voltage lower than a heating voltage of the heating member when detecting the resistance of the heating member. The circuit of claim 1 wherein: Also includes a heating switch; The heating voltage supplies power to the heating element through the heating switch. The circuit of claim 2 wherein: The output is for not outputting a voltage when the resistance of the heating element is not detected. A circuit according to any of claims 1-3, characterized in that Also includes a reference resistor; The output is electrically connected to the heating element through the reference resistor. A circuit as claimed in claim 1 or 3, wherein The buck regulator circuit is a buck regulator chip, and the buck regulator chip includes an enable terminal, and the enable terminal is configured to receive an enable signal when detecting a resistance of the heating component; The buck regulator chip is configured to control whether the output terminal outputs a voltage according to an enable signal. The circuit of claim 4 wherein: Also included is a first electrode and a second electrode, the two terminals of the heating member being respectively for electrically connecting with the first electrode and the second electrode. The circuit of claim 6 wherein: Also includes a voltage detection circuit; The second electrode is grounded, and the voltage detecting circuit is configured to detect a voltage of the first electrode. The circuit of claim 6 wherein: Also includes a heating switch; The heating voltage is supplied to the heating member through the heating switch; The heating switch comprises a P-channel switching tube and an N-channel switching tube; The first end of the P-channel switch tube is electrically connected to the heating voltage, and the second end is electrically connected to the first electrode; The first end of the N-channel switch tube is electrically connected to the heating voltage and the control end of the P-channel switch tube, and the second end is grounded. An aerosol generating device includes a heating switch and a microprocessor, and is characterized in that it further comprises a step-down voltage regulator chip and a reference resistor; Heating a voltage through the heating switch to supply power to the heating element of the aerosol generating device; The buck regulator chip includes an enable end and an output end, the output end is electrically connected to the heating element; the enable end is connected to a first signal output end of the microprocessor, and the micro processing The device is configured to output an enable signal at the first signal output end when detecting the resistance of the heating element; the output end is configured to output a stable voltage lower than the heating voltage when the enable end receives the enable signal . The aerosol generating device according to claim 9, wherein Further comprising a first electrode and a second electrode, the two terminals of the heating member being respectively for electrically connecting with the first electrode and the second electrode; The heating switch comprises a P-channel switching tube and an N-channel switching tube; The first end of the P-channel switch tube is electrically connected to the heating voltage, and the second end is electrically connected to the first electrode; a first end of the N-channel switch is electrically connected to the heating voltage and a control end of the P-channel switch, and a second end is grounded, and a control end of the N-channel switch is connected to the microprocessor The second signal output. The aerosol generating device according to claim 10, wherein Also including a first electrode, a second electrode, and a voltage detecting circuit; The two terminals of the heating member are respectively connected to the first electrode and the second electrode; The second electrode is grounded, and the voltage detecting circuit is configured to detect a voltage of the first electrode.

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