WO2019165742A1

WO2019165742A1 - Voltage output circuit and method, and electronic cigarette

Info

Publication number: WO2019165742A1
Application number: PCT/CN2018/095095
Authority: WO
Inventors: 邱伟华; 樊桂梅
Original assignee: 常州市派腾电子技术服务有限公司
Priority date: 2018-03-02
Filing date: 2018-07-10
Publication date: 2019-09-06
Also published as: CN108491017A

Abstract

A voltage output circuit and method, and an electronic cigarette. The voltage output circuit comprises a power source (300) and a step-down circuit (200). The step-down circuit (200) is connected to the power source (300) and configured to convert the power supply voltage of the power source (300) to an operating voltage, wherein the operating voltage is less than or equal to the limit discharge voltage of the power source (300), and the operating voltage is the voltage of a working device (400) connected to the voltage output circuit during normal operation. According to the voltage output circuit and method, and the electronic cigarette, the power supply voltage of the power source (300) is converted to an operating voltage by means of the step-down circuit (200), so that even if the power supply voltage of the power source (300) is reduced, or even reduced to the limit discharge voltage, the working device (400), such as an atomizer, can still operate at a normal operating voltage, thereby solving the problem in the prior art that the electronic cigarette may be unable to operate as the battery power decreases.

Description

Voltage output circuit, method and electronic cigarette

Technical field

The present invention relates to the field of electronic devices, and in particular, to a voltage output circuit, method, and electronic cigarette.

Background technique

In order to give users more experience, in addition to the smoking function, there are many functions, such as multimedia browsing, touch screen operation, navigation, solar charging, etc., which means that manufacturers can better sell their own electronic cigarettes. product.

However, as the battery of the electronic cigarette is continuously discharged, the power is gradually reduced, and the voltage that the battery can output is also continuously reduced. Therefore, in the existing solution, after the battery power is reduced, there may be a problem that the electronic cigarette does not work normally.

Summary of the invention

The invention provides a voltage output circuit, a method and an electronic cigarette, which can solve the problem that the electronic cigarette may not work normally as the battery power is reduced.

The technical solution adopted by the present invention to solve the technical problem is as follows:

The invention discloses a voltage output circuit comprising a power supply and a step-down circuit; the step-down circuit is connected to the power source for converting a power supply voltage of the power source into an operating voltage, wherein the working voltage is less than or equal to The limit discharge voltage of the power source, and the operating voltage is a voltage when the working device connected to the voltage output circuit operates normally.

In one embodiment, the voltage output circuit further includes a control circuit electrically connected to the step-down circuit, and the step-down circuit is configured to convert a power supply voltage of the power source according to a control signal of the control circuit For the operating voltage.

In one embodiment, the control circuit includes a control chip, and the control chip includes a control signal input end and a modulation signal output end, and the control signal input end of the control chip receives the power supply of the power source through the first switching element. Voltage and grounded through the initial ground resistance.

In one embodiment, the step-down circuit includes a buck switch chip, and the buck switch chip includes a first pass end, a first control end, and a second pass end, and the first path of the buck switch chip The terminal receives the power supply voltage of the power source, the first control end of the buck switch chip is connected to the modulation signal output end of the control chip, and the second path end of the buck switch chip outputs the working voltage.

In one embodiment, the control chip further includes a detection enable signal output end, a first current receiving end, and a second current receiving end, wherein the voltage output circuit further includes a resistance detecting circuit, and the detecting of the control chip The energy signal output end is connected to the resistance detecting circuit;

The resistance detecting circuit includes a third current limiting resistor, a fourth current limiting resistor, a first detecting resistor, a second detecting resistor, a third detecting resistor, a third filter capacitor, a fourth filter capacitor, and a second switching component;

The third path end of the second switching element receives the power supply voltage of the power source, and is connected to the detection enable signal output end of the control chip through the third current limiting resistor, and the second switching element The second control terminal is connected to the detection enable signal output end of the control chip through the fourth current limiting resistor, and the fourth pass end of the second switching element passes the first detecting resistor and the buck switch chip The second path ends are connected;

One end of the second detecting resistor is grounded through the third filter capacitor, and is connected to the first current detecting end of the control chip, and the other end of the second detecting resistor and the second end of the buck switch chip Connected to the path end;

One end of the third detecting resistor is grounded through the fourth filter capacitor, and is connected to a second current detecting end of the control chip, and the other end of the third detecting resistor and the fourth end of the second switching element The path ends are connected.

In one embodiment, the step-down circuit includes a modulation switching element, a storage inductor, a filter capacitor, and a freewheeling diode. The modulation switching element is configured to be driven according to the pulse width modulation signal, and to turn on a power supply voltage of the power source during driving, the modulation switching element includes an input end, a control end, and an output end, and the input of the modulation switching element The terminal receives the supply voltage of the power source, and the control terminal of the modulation switching element receives the pulse width modulation signal. The energy storage inductor is used for energy storage and power supply, a first end of the energy storage inductor is connected to an output end of the modulation switching element, and a second end of the energy storage inductor outputs the operating voltage. The filter capacitor is used for energy storage and power supply. The first end of the filter capacitor is connected to the second end of the energy storage inductor, and the second end of the filter capacitor is grounded. The anode of the freewheeling diode is grounded, and the cathode of the freewheeling diode is connected to the output of the modulation switching element.

The present invention also provides a voltage output method, comprising: obtaining a power supply voltage of a power source; converting the power supply voltage into an operating voltage by a step-down circuit, wherein the operating voltage is less than or equal to a limit discharge voltage of the power source, and The operating voltage is the voltage at which the working device is driven to operate normally.

In one embodiment, the voltage output method further includes: detecting, by the resistance detecting circuit, a resistance value of the connected working device; converting, by the step-down circuit, a power supply voltage of the power source to correspond to the resistance value Operating Voltage.

The invention also provides an electronic cigarette comprising the above voltage output circuit.

In one embodiment, the electronic cigarette includes an atomizer, and after receiving the operating voltage, the atomizer atomizes the aerosol-forming substrate according to the working voltage for the user to smoke.

The embodiment further provides an electronic cigarette, the electronic cigarette comprising a processor and a memory, wherein the memory stores at least one program instruction, and the processor implements the voltage output method by loading and executing the at least one program instruction.

The embodiment further provides a computer storage medium having at least one program instruction stored therein, the at least one program instruction being loaded and executed by the processor to implement the voltage output method described above.

The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are:

The invention provides a voltage output circuit, a method and an electronic cigarette, wherein a power supply voltage of a power source is converted into a working voltage by a step-down circuit, wherein the working voltage is less than or equal to a limit discharge voltage of the power source, and the working voltage is connected to the voltage output circuit. The voltage of the working equipment during normal operation, so that even if the power supply voltage of the power supply is lowered, or even reduced to the limit discharge voltage, the working equipment such as the atomizer can still operate at a normal working voltage, which solves the problem that the battery power decreases with the prior art. The problem that e-cigarettes may not work.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

DRAWINGS

1 is a schematic diagram of a voltage output circuit of a first embodiment of the present invention;

2 is a circuit connection diagram of a voltage output circuit of a second embodiment of the present invention;

Fig. 3 is a circuit connection diagram of a voltage output circuit of a third embodiment of the present invention.

Detailed ways

In order to further explain the technical means and functions of the present invention for achieving the intended purpose of the present invention, the specific embodiments and structures of the voltage output circuit, method and electronic cigarette according to the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Features and effects, as detailed below.

The foregoing and other objects, features, and advantages of the invention will be apparent from The technical means and functions of the present invention for achieving the intended purpose can be more deeply and specifically understood by the description of the embodiments, but the drawings are only for the purpose of reference and description, and are not intended to limit.

First embodiment

1 is a schematic diagram of a voltage output circuit of a first embodiment of the present invention. As shown in FIG. 1, the voltage output circuit of the present embodiment includes a power supply 300 and a step-down circuit 200. The step-down circuit 200 is connected to the power supply 300 for converting the power supply voltage of the power supply 300 into an operating voltage, wherein the operating voltage is less than or equal to The limit discharge voltage of the power source 300, and the operating voltage is the voltage at which the working device 400 connected to the voltage output circuit operates normally.

Specifically, the step-down circuit 200 is connected to the power source 300, and the power supply voltage on the connected power source 300 is converted into an operating voltage by the step-down circuit 200, wherein the operating voltage is less than or equal to the limit discharge voltage of the power source 300, and the operating voltage is a voltage The voltage at which the working device 400 connected to the output circuit is operating normally. Wherein, the limit amplification voltage is the minimum value of the power supply voltage that can be output after the power source 300 is completely discharged; the limit discharge voltage and the full power voltage of the power source 300 are related to the type of the battery and the number of sections of the battery used, and the present invention This is not limited.

The above-mentioned power source 300 refers to power supply for each component in the electronic cigarette, and may be a rechargeable battery or a non-rechargeable battery. The battery type may be a lithium battery, an alkaline dry battery, a nickel hydrogen battery, or a cadmium nickel. Batteries, lead-acid batteries, iron-nickel batteries, metal oxide batteries, zinc-silver batteries, zinc-nickel batteries, oxyhydrogen fuel cells, solar cells, and the like. The number of batteries is determined by the capacity of each battery and the total capacity required for the electronic cigarette.

Therefore, even if the power supply voltage of the power source 300 is lowered or even reduced to the limit discharge voltage, the step-down circuit 200 can normally output an operating voltage equal to or less than the limit discharge voltage, and the operating voltage is the voltage at which the working device 400 operates normally, and the voltage is The working device 400 connected to the output circuit, for example, the atomizer can still operate at a normal working voltage after receiving the working voltage, which solves the problem that the electronic cigarette may not work as the battery power decreases in the prior art.

In one embodiment, the voltage output circuit further includes a control circuit 100 electrically connected to the step-down circuit 200, and the step-down circuit 200 is configured to convert the power supply voltage of the power source 300 into an operating voltage according to a control signal of the control circuit 100. Specifically, the control circuit 100 outputs a pulse width modulation signal; the step-down circuit 200 is connected to the control circuit 100 and is driven when receiving a pulse width modulation signal of an active level (for example, the active level of the PMOS transistor is a low level), The supply voltage on the connected power source 300 is converted into an operating voltage.

In one embodiment, the voltage output circuit further includes a resistance detecting circuit 500 electrically connected to the step-down circuit 200, and the resistance detecting circuit 500 is configured to detect the resistance value of the connected working device 400. The step-down circuit 200 is configured to convert the supply voltage into an operating voltage corresponding to the resistance value according to the resistance value detected by the resistance detecting circuit 500. The corresponding relationship between the different resistance values and the operating voltage may be pre-stored, and after detecting the resistance value, the operating voltage corresponding to the detected resistance value is queried according to the correspondence relationship. The operating voltage corresponding to the resistance value may be lower than the limit discharge voltage or higher than the limit discharge voltage.

The voltage output circuit of the embodiment converts the power supply voltage of the power source into a working voltage through the step-down circuit 200, wherein the working voltage is less than or equal to the limit discharge voltage of the power source 300, and the working voltage is normal to the working device 400 connected to the voltage output circuit. The voltage at the time of operation, so that even if the power supply voltage of the power source 300 is lowered or even lowered to the limit discharge voltage, the working device 400 such as the atomizer can still operate at a normal operating voltage, which solves the problem that the battery power decreases as in the prior art. The problem that e-cigarettes may not work.

Second embodiment

Fig. 2 is a circuit connection diagram of a voltage output circuit of a second embodiment of the present invention. As shown in FIG. 2, in the voltage output circuit of this embodiment, the control circuit 100 includes a control chip U1, and the step-down circuit 200 includes a buck switch chip U2.

Specifically, the control chip U1 includes a control signal input terminal 11 and a modulation signal output terminal 12. The control signal input terminal 11 of the control chip U1 receives the power supply voltage VCC_BAR of the power supply through the first switching element SW1, and is grounded through the initial grounding resistance R1.

Specifically, the buck switch chip U2 includes a first pass end 21, a first control end 22, and a second pass end 23. The first path end 21 of the buck switch chip U2 receives the power supply voltage VCC_BAR of the power supply, and the first control terminal 22 of the buck switch chip U2 is connected to the modulation signal output terminal 12 of the control chip U1.

In one embodiment, the control chip U1 can be, but is not limited to, a model number N76E003-MSOP10* ICP integrated chip, and the control signal input terminal 11 is an AIN5/STADC/IC3/PWM3/P0-4 pin. The modulated signal output 12 is a P0-6/TXD/AIN3 pin.

In one embodiment, the buck switch chip U2 can be, but is not limited to, a PMOS (positive channel metal Oxide Semiconductor) tube integrated chip of the type DTQ3205. The first path end 21 of the buck switch chip U2 is a source, the second path end 23 is a drain, and the first control end 22 is a gate. In other embodiments, the buck switch chip U2 can also be other types or other types of integrated chips.

Specifically, when the first switching element SW1 is turned on, the control signal input terminal 11 receives the high level signal, and therefore, the modulation signal output terminal 12 of the control chip U1 outputs the pulse modulation signal to the first control of the buck switch chip U2. End 22, such that the first control terminal 22 of the buck switch chip U2 controls the first path end 21 and the first pass terminal when receiving a pulse width modulated signal of an active level (eg, the active level of the PMOS transistor is low) The two-pass terminal 23 is turned on, thereby causing the second via terminal 23 to output a driving voltage VOUT whose voltage value is smaller than the voltage value of the power supply voltage VCC_BAR of the power source.

In one embodiment, the control signal input terminal 11 of the control chip U1 receives the power supply voltage VCC_BAR of the power supply through the first current limiting resistor R2 and the first switching element SW1; and/or the first control terminal 22 of the buck switch chip U2. The second current limiting resistor R3 is connected to the modulation signal output terminal 12 of the control chip U1.

In one embodiment, the control chip U1 further includes a first power source 300 receiving end 13 and a first ground end 14 . The receiving end 13 of the first power source 300 of the control chip U1 receives the power supply voltage VCC_BAR of the power supply through the first filter resistor R4, and is connected to the first ground terminal 14 of the control chip U1 through the first filter capacitor C1 and the second filter capacitor C2 connected in parallel. .

In one embodiment, the first power source 300 receiving end 13 and the first ground end 14 can be, but are not limited to, the VDD pin and the GND pin of the N76E003-MSOP10*ICP integrated chip, respectively.

In one embodiment, the voltage output circuit further includes a resistance detecting circuit 500 electrically connected to the step-down circuit 200, the resistance detecting circuit 500 is configured to detect a resistance value of the connected working device 400; and the step-down circuit 200 is configured to The resistance value detected by the detection circuit 500 converts the supply voltage into an operating voltage corresponding to the resistance value.

In one embodiment, the resistance detecting circuit 500 includes a third current limiting resistor R5, a fourth current limiting resistor R6, a first detecting resistor R7, a second detecting resistor R8, a third detecting resistor R9, and a third filtering capacitor C3. The fourth filter capacitor C4 and the second switching element SW2; the third path end of the second switching element SW2 receives the power supply voltage of the power source, and is connected to the first end of the third current limiting resistor R5, and the second of the second switching element SW2 The control end is connected to the first end of the fourth current limiting resistor R6, the fourth end of the second switching element SW2 is connected to the first end of the first detecting resistor R7; the second end and the fourth end of the third current limiting resistor R5 The second end of the second detecting resistor R8 is connected to the ground through the third filter capacitor C3, and the second end of the second detecting resistor R8 is connected to the second end of the first detecting resistor R7, and The working device 400 is connected; the first end of the third detecting resistor R9 is grounded through the fourth filter capacitor C4, and the second end of the third detecting resistor R9 is connected to the fourth path end of the second switching element SW2.

In one embodiment, the voltage output circuit further includes a detection enable signal output terminal 15, a first current receiving terminal 16, a second current receiving terminal 17, and a detection enable signal output terminal 15 and a third current limiting resistor R5. The two ends are connected; the first current receiving end 16 is connected to the first end of the second detecting resistor R8; and the second current receiving end 17 is connected to the first end of the third detecting resistor R9. In an embodiment, the detection enable signal output terminal 15, the first current receiving terminal 16, and the second current receiving terminal 17 may be limited to the port of the control chip U1.

In one embodiment, the detection enable signal output terminal 15, the first current receiving terminal 16, and the second current receiving terminal 17 can be, but are not limited to, AIN7/CLO/IC1/PWM1/ of the N76E003-MSOP10*ICP integrated chip, respectively. P1 pin, AIN6/IC5/PWM5/P0-3 pin, P0-6/TXD/AIN3 pin.

In one embodiment, the second switching element SW2 may be a PNP type transistor, the third path end of the second switching element SW2 is an emitter, the second control end of the second switching element SW2 is a base, and the second switching element The fourth path end of SW2 is a collector. In other embodiments, the second switching element SW2 can also be other types of transistors such as PMOS transistors and the like. Hereinafter, the second switching element SW2 will be described as an example of a PNP type triode. Specifically, when the first switching element SW1 is not turned on or off, the detection enable signal output terminal 15 of the control chip U1 outputs a low level signal, thereby causing the second switching element SW2 to be turned on, and controlling the first of the chip U1. The current receiving end 16 and the second current receiving end 17 respectively receive the current flowing through the second detecting resistor R8 and the third detecting resistor R9, and according to the current difference received by the first current receiving end 16 and the second current receiving end 17 The value captures the resistance of the working device 400, such as an atomizer.

Specifically, the voltage output circuit of the embodiment outputs a pulse width modulation signal to the buck switch chip U2 by using the control chip U1, so that the buck switch chip U2 converts the power supply voltage of the power source 300 into an operating voltage according to the pulse width modulation signal. Wherein, the working voltage is less than or equal to the limit discharge voltage of the power source 300, and the working voltage is the voltage when the working device 400 connected to the voltage output circuit operates normally. Thus, even if the supply voltage of the power source 300 is lowered or even lowered to the limit discharge voltage, the step-down circuit 200 can output an operating voltage smaller than the limit discharge voltage, and the operating voltage is the voltage at which the working device 400 connected to the voltage output circuit operates normally. Then, the working device 400, such as the atomizer, can always work normally after receiving the operating voltage. The voltage output circuit of this embodiment can output the operating voltage VOUT by using only the control chip U1 and the buck switch chip U2, so the structure is simple. In addition, in the embodiment, the current limiting protection can be performed by using the first current limiting resistor R2 and the second current limiting resistor R3 to prevent circuit damage, so that the stability of the voltage output circuit is enhanced.

In the voltage output circuit of this embodiment, since only the control chip U1 and the step-down switching chip U2 can output the operating voltage VOUT, the structure is simple. The voltage output circuit converts the power supply voltage of the power source 300 into an operating voltage according to the pulse width modulation signal output by the control circuit 100, wherein the operating voltage is less than or equal to the limit discharge voltage of the power source 300, and the operating voltage is a voltage output circuit. The voltage of the connected working device 400 during normal operation, so that even if the power supply voltage of the power supply 300 is lowered, even to the limit discharge voltage, the working device 400 such as the atomizer can always operate normally after receiving the operating voltage.

Third embodiment

Fig. 3 is a circuit connection diagram of a voltage output circuit of a third embodiment of the present invention. As shown in FIG. 3, please refer to FIG. 2 at the same time, this embodiment is basically the same as the second embodiment, and the difference is that the step-down circuit 200 includes a modulation switching element T1, a storage inductor L1, a filter capacitor C21, and a freewheeling. Diode D1. The modulation switching element T1 is used for driving according to a pulse width modulation signal. When driving, the power supply voltage of the power supply 300 is turned on. The modulation switching element T1 includes an input end, a control end, and an output end. The input end of the modulation switching element T1 receives the power supply of the power supply 300. The voltage, the control terminal of the modulation switching element T1 receives the pulse width modulated signal. The energy storage inductor L1 is used for energy storage and power supply, the first end of the energy storage inductor L1 is connected to the output end of the modulation switch element T1, and the second end of the energy storage inductor L1 outputs the working voltage. The filter capacitor C21 is used for energy storage and power supply. The first end of the filter capacitor C21 is connected to the second end of the storage inductor L1, and the second end of the filter capacitor C21 is grounded. The anode of the freewheeling diode D1 is grounded, and the cathode of the freewheeling diode D1 is connected to the output of the modulation switching element T1.

Specifically, the control end of the modulation switching element T1 of the present embodiment is driven according to a pulse width modulation signal of an effective level (for example, an active level of the PMOS transistor is low level) output by the control circuit 100, thereby modulating the switching element T1. The input end and the output end are turned on, and the energy storage inductor L1 and the filter capacitor C21 are energy storage components. When the modulation switch element T1 is turned on, the energy storage inductor L1 and the filter capacitor C21 perform energy storage. The inductor L1, the filter capacitor C21 and the freewheeling diode D1 form a circuit loop, and the energy storage inductor L1 and the filter capacitor C21 supply power, thereby converting the power supply voltage of the power source 300 into an operating voltage, wherein the operating voltage is less than or equal to the limit of the power source 300. The discharge voltage, and the operating voltage is the voltage at which the working device 400 connected to the voltage output circuit operates normally. Thus, even if the supply voltage of the power source 300 is lowered or even lowered to the limit discharge voltage, the step-down circuit 200 can output an operating voltage smaller than the limit discharge voltage, and the operating voltage is the voltage at which the working device 400 connected to the voltage output circuit operates normally. Then, the working device 400, such as the atomizer, can always work normally after receiving the operating voltage.

The voltage output circuit of the embodiment adopts a modulation switching element T1, a storage energy inductor L1 and a filter capacitor C21 to convert the power supply voltage of the power source 300 into an operating voltage, wherein the working voltage is less than or equal to the limit discharge voltage of the power source 300, and works. The voltage is the voltage at which the working device 400 connected to the voltage output circuit operates normally, so that even if the power supply voltage of the power source 300 is lowered or even reduced to the limit discharge voltage, the working device 400 such as the atomizer can always operate normally after receiving the operating voltage. .

Fourth embodiment

The embodiment provides a voltage output method, comprising: obtaining a power supply voltage of a power source; converting a power supply voltage into a working voltage by a step-down circuit, wherein the working voltage is less than or equal to a limit discharge voltage of the power source 300, and the working voltage is a driving working device. 400 voltage during normal operation.

In one embodiment, the voltage output method further includes: detecting the resistance value of the connected working device 400 through the resistance detecting circuit 500; converting the power supply voltage of the power source 300 to the operating voltage corresponding to the resistance value through the step-down circuit 200.

A voltage output method of the present invention converts a power supply voltage of the power source 300 into an operating voltage, wherein the operating voltage is less than or equal to a limit discharge voltage of the power source 300, and the operating voltage is a voltage at which the operating device 400 is normally operated, thereby even The power supply voltage of the power supply 300 is lowered, even to the limit discharge voltage, and the working device 400, such as the atomizer, can still operate at a normal operating voltage after receiving the operating voltage, which solves the problem in the prior art as the battery power decreases. The problem that smoke may not work.

Fifth embodiment

The embodiment provides an electronic cigarette, and the electronic cigarette includes the voltage output circuit in the above embodiment.

In one embodiment, the electronic cigarette includes an atomizer, and after receiving the working voltage, the atomizer atomizes the aerosol-forming substrate according to the working voltage for the user to suck, that is, the atomizer of the embodiment is the above One of the working devices 400 of the embodiment. In particular, the aerosol-forming substrate can be, but is not limited to, a liquid smoke such as sesame, tobacco, and the like. Specifically, the power supply voltage of the power source is converted into an operating voltage by the step-down circuit 200, wherein the voltage of the atomizer during normal operation is an operating voltage, and the operating voltage is less than or equal to the limit discharge voltage of the power source 300, so that even the power source 300 The supply voltage is reduced, even to the limit discharge voltage, and the atomizer can always operate normally after receiving the operating voltage.

In the electronic cigarette of the embodiment, the power supply voltage of the power source is converted into an operating voltage by the step-down circuit 200, wherein the working voltage is less than or equal to the limit discharge voltage of the power source 300, and the working voltage is the normal operation of the working device 400 connected to the voltage output circuit. The voltage, so that even if the power supply voltage of the power supply 300 is lowered, or even reduced to the limit discharge voltage, the atomizer can still operate at a normal operating voltage, which solves the problem that the electronic cigarette may not work as the battery power decreases in the prior art. The problem.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The present invention has been described above by way of preferred embodiments, but is not intended to limit the invention, and any skilled person skilled in the art. The present invention may be modified or modified to equivalent variations without departing from the technical scope of the present invention, without departing from the scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

Claims

A voltage output circuit, comprising: a power supply (300) and a step-down circuit (200);

The step-down circuit (200) is connected to the power source (300), and the step-down circuit (200) is configured to convert a power supply voltage of the power source (300) into an operating voltage, wherein the operating voltage is less than or equal to The limit discharge voltage of the power source (300), and the operating voltage is a voltage at which the working device (400) connected to the voltage output circuit operates normally.
The voltage output circuit according to claim 1, wherein said voltage output circuit further comprises a control circuit (100) electrically connected to said step-down circuit (200), said step-down circuit (200) The supply voltage of the power source (300) is converted to the operating voltage according to a control signal of the control circuit (100).
The voltage output circuit according to claim 2, wherein said control circuit (100) comprises a control chip (U1), said control chip (U1) comprising a control signal input terminal (11) and a modulation signal output terminal ( 12), the control signal input terminal (11) of the control chip (U1) receives the power supply voltage of the power source (300) through the first switching element, and is grounded through the initial grounding resistance (R1).
The voltage output circuit according to claim 3, wherein said step-down circuit (200) comprises a buck switch chip (U2), said buck switch chip (U2) comprising a first pass end (21), a first control terminal (22) and a second path end (23), a first path end (21) of the buck switch chip (U2) receives a supply voltage of the power source 300, and the buck switch chip (U2) The first control terminal (22) is connected to the modulation signal output terminal (12) of the control chip (U1), and the second path terminal (23) of the buck switch chip (U2) outputs the operating voltage.
The voltage output circuit of claim 2 wherein said step-down circuit (200) comprises

a modulation switching element (T1) for driving according to the pulse width modulation signal, the modulation switching element (T1) comprising an input end, a control end and an output end, the input end of the modulation switching element (T1) receiving a supply voltage of the power supply (300), the control end of the modulation switching element (T1) receiving the pulse width modulation signal;

a storage inductor (L1) for storing and supplying power, a first end of the energy storage inductor (L1) being connected to an output end of the modulation switching element (T1), and the energy storage inductor (L1) The two ends output the operating voltage;

a filter capacitor (C21) for storing and supplying power, a first end of the filter capacitor (C21) being connected to a second end of the energy storage inductor (L1), and a second end of the filter capacitor (C21) Grounding

A freewheeling diode (D1), the anode of which is connected to the anode of the freewheeling diode (D1), and the cathode of the freewheeling diode (D1) is connected to the output of the modulation switching element (T1).
The voltage output circuit according to any one of claims 1 to 5, wherein the voltage output circuit further comprises a resistance detecting circuit 500 electrically connected to the step-down circuit (200), the resistance detecting circuit 500 a resistance value of the working device (400) for detecting connection;

The step-down circuit (200) is configured to convert the supply voltage to an operating voltage corresponding to the resistance value according to a resistance value detected by the resistance detecting circuit (500).
The voltage output circuit according to claim 6, wherein said resistance detecting circuit (500) comprises a third current limiting resistor (R5), a fourth current limiting resistor (R6), a first detecting resistor (R7), a second detecting resistor (R8), a third detecting resistor (R9), a third filter capacitor (C3), a fourth filter capacitor (C4), and a second switching element;

a third path end of the second switching element receives a supply voltage of the power source, and is connected to a first end of the third current limiting resistor (R5), and a second control end of the second switching element a fourth current limiting resistor (R6) is connected to the first end, and a fourth path end of the second switching element is connected to the first end of the first detecting resistor (R7); the third current limiting resistor ( a second end of R5) is connected to a second end of the fourth current limiting resistor (R6);

a first end of the second detecting resistor (R8) is grounded through the third filter capacitor (C3), a second end of the second detecting resistor (R8) and a first detecting resistor (R7) The two ends are connected and connected to the working device (400);

a first end of the third detecting resistor (R9) is grounded through the fourth filter capacitor (C4), a second end of the third detecting resistor (R9) and a fourth end of the second switching element Connected.
The voltage output circuit according to claim 7, wherein said voltage output circuit further comprises a detection enable signal output terminal (15), a first current receiving terminal (16), and a second current receiving terminal (17), The detection enable signal output terminal (15) is connected to the second end of the third current limiting resistor (R5); the first current receiving end (16) and the first end of the second detecting resistor (R8) Connected; the second current receiving end (17) is connected to the first end of the third detecting resistor (R9).
A voltage output method, comprising:

Obtain the power supply voltage of the power supply;

The supply voltage is converted to an operating voltage by a step-down circuit, wherein the operating voltage is less than or equal to a limit discharge voltage of the power source, and the operating voltage is a voltage when the working device is driven to operate normally.
The method of claim 9 wherein the method further comprises:

Detecting a resistance value of the connected working device through a resistance detecting circuit;

The power supply voltage of the power source is converted into an operating voltage corresponding to the resistance value by the step-down circuit.
An electronic cigarette characterized by comprising the voltage output circuit according to any one of claims 1 to 8.