Reverse connection prevention circuit, atomization device and electronic equipment

Abstract

The application discloses a reverse connection prevention circuit, an atomization device and electronic equipment, and belongs to the technical field of electronic circuits. By connecting a selection circuit, when the battery voltage is negative, the battery voltage is stopped from being transmitted through an internal switch tube, so as to disconnect the output of the power supply voltage. When the power supply voltage is disconnected, the control circuit stops outputting the control signal. When the control signal is disconnected, the power circuit stops converting the battery voltage into the driving voltage, so as to stop the work of the resistive load. Therefore, when the battery is reversely connected (the battery voltage is negative), the output of the power supply voltage is disconnected, so that the possibility of damage of the control circuit is reduced without configuring a lithium battery protection circuit, and the hardware design is simplified. The power circuit is powered by the battery voltage, so that the switch tube in the selection circuit only needs to bear the energy consumption of the control circuit, the power of the switch tube is reduced, and the volume and cost are reduced.

Description

Technical Field

[0001] This application belongs to the field of electronic circuit technology, and in particular relates to a reverse connection protection circuit, an atomizing device, and an electronic device. Background Technology

[0002] As the demand for atomizing devices increases, the welding speed requirement is getting faster and faster. Due to the fundamental difference between humans and machines, frequent welding can lead to misoperation, such as connecting the positive and negative terminals of the battery incorrectly, which can damage some components on the circuit board. To avoid the above problems, related atomizing devices are usually designed with lithium battery protection circuits. However, this improvement solution increases the space size and cost, which is not conducive to miniaturization design.

[0003] Therefore, the related reverse connection protection circuit hardware design is complex, bulky, and costly. Utility Model Content

[0004] The purpose of this application is to provide a reverse connection protection circuit, atomizing device, and electronic device, which aims to solve the problems of complex hardware design, large size, and high cost of related reverse connection protection circuits.

[0005] This application provides a reverse connection protection circuit, including:

[0006] Connected to a battery used to provide battery voltage, including:

[0007] The access selection circuit is connected to the battery and is used to access the battery voltage. In response to the battery voltage being negative, it stops transmitting the battery voltage through the internal switching transistor to disconnect the output of the power supply voltage.

[0008] A control circuit, connected to the access selection circuit, is used to stop outputting control signals in response to the disconnection of the power supply voltage;

[0009] A power circuit, connected to the battery, the access selection circuit, and the control circuit, is used to stop converting the battery voltage into a drive voltage in response to the disconnection of the control signal, so as to stop the resistive load from operating.

[0010] In one embodiment, it further includes:

[0011] An indicator circuit, connected to the battery, the power circuit, and the access selection circuit, is used to indicate when the battery voltage is negative.

[0012] In one embodiment, it further includes:

[0013] A charging circuit, connected to the battery, the access selection circuit, and the power circuit, is used to output a charging status signal in response to the input of DC power.

[0014] The access selection circuit is also used to transmit the battery voltage through an internal switching transistor and output the power supply voltage in response to the battery voltage being positive, so as to power the control circuit.

[0015] The control circuit is also used to output a first-level charging enable signal according to the charging status signal when the battery voltage is greater than or equal to a preset voltage.

[0016] The charging circuit is also used to convert the input DC power into a charging voltage in response to the charging enable signal of the first level.

[0017] The battery is specifically used to charge according to the charging voltage and output the battery voltage;

[0018] The charging voltage is equal to the battery voltage;

[0019] The control circuit is also used to stop working when the battery voltage is lower than the preset voltage, and to make the charging enable signal in a high-impedance state.

[0020] The charging circuit is also configured to convert the input DC power into a trickle charging voltage in response to the charging enable signal in a high-impedance state, so as to trickle charge the battery.

[0021] In one embodiment, it further includes:

[0022] A pressure detection circuit, connected to the control circuit, is used to detect the pressure and output a pressure detection signal.

[0023] The control circuit is also configured to power on according to the supply voltage, output the control signal according to the air pressure detection signal, and output the charging enable signal of the second level in response to the air pressure detection signal;

[0024] The power circuit is also used to convert the battery voltage into the drive voltage according to the control signal, so that the resistive load operates according to the drive voltage;

[0025] The charging circuit is also configured to stop converting the input DC power into a charging voltage in response to the second-level charging enable signal, thereby stopping the charging of the battery;

[0026] The polarity of the first level is opposite to that of the second level.

[0027] In one embodiment, it further includes:

[0028] A sampling circuit, connected to the resistive load and the power circuit, is used to sample the driving voltage and output a sampling signal.

[0029] The control circuit is specifically used to power on according to the supply voltage, output the control signal according to the air pressure detection signal and the sampling signal, and output the charging enable signal of the second level in response to the air pressure detection signal.

[0030] In one embodiment, the control circuit is further configured to output a display signal and a display enable signal based on the air pressure detection signal;

[0031] The reverse connection protection circuit also includes:

[0032] A switching circuit, connected to the access selection circuit and the control circuit, is used to transmit the power supply voltage according to the display enable signal;

[0033] The display circuit is connected to the switching circuit and the control circuit, and is used to power on according to the power supply voltage and to display according to the display signal.

[0034] In one embodiment, the access selection circuit includes a first field-effect transistor and a first resistor; wherein the switching transistor inside the access selection circuit is the first field-effect transistor;

[0035] The source of the first field-effect transistor and the first end of the first resistor are connected and together form the input terminal of the access selection circuit, which is connected to the battery to receive the battery voltage;

[0036] The drain of the first field-effect transistor forms the output terminal of the access selection circuit, which is connected to the control circuit to output the supply voltage;

[0037] The gate of the first field-effect transistor and the second terminal of the first resistor are both connected to the power supply ground.

[0038] In one embodiment, the control circuit includes a microprocessor, a first capacitor, and a second resistor;

[0039] The power supply terminal of the microprocessor is connected to the first terminal of the first capacitor and the first terminal of the second resistor.

[0040] The second end of the second resistor constitutes the power supply terminal of the control circuit and is connected to the access selection circuit to receive the power supply voltage;

[0041] The first general-purpose input / output terminal of the microprocessor constitutes the control signal output terminal of the control circuit, and is connected to the power circuit to output the control signal;

[0042] The second general-purpose input / output terminal of the microprocessor constitutes the charging enable signal output terminal of the control circuit, and is connected to the charging circuit to output the charging enable signal.

[0043] The third general-purpose input / output terminal of the microprocessor constitutes the charging status signal input terminal of the control circuit and is connected to the charging circuit to receive the charging status signal.

[0044] The fourth general-purpose input / output terminal of the microprocessor constitutes the sampling signal input terminal of the control circuit and is connected to the sampling circuit to receive the sampling signal;

[0045] The fifth general-purpose input / output terminal of the microprocessor constitutes the air pressure detection signal input terminal of the control circuit and is connected to the air pressure detection circuit to receive the air pressure detection signal.

[0046] The sixth general-purpose input / output terminal of the microprocessor constitutes the display enable signal output terminal of the control circuit, and is connected to the switching circuit to output the display enable signal.

[0047] The seventh and eighth general-purpose input / output terminals of the microprocessor constitute the display signal output terminal of the control circuit, which is connected to the display circuit to output a display signal.

[0048] This utility model embodiment also provides an atomizing device, which includes the above-described reverse connection protection circuit.

[0049] This utility model embodiment also provides an electronic device, which includes the above-described reverse connection protection circuit.

[0050] The beneficial effects of this utility model embodiment compared with the prior art are as follows: Since the access selection circuit responds to the negative battery voltage by stopping the transmission of battery voltage through the internal switching transistor, thereby disconnecting the output of the supply voltage; the control circuit responds to the disconnection of the supply voltage by stopping the output of the control signal; the power circuit responds to the disconnection of the control signal by stopping the conversion of the battery voltage into the drive voltage, thereby stopping the resistive load from working; thus, in the case of reverse connection of the battery (battery voltage is negative), the output of the supply voltage is disconnected, thereby reducing the possibility of control circuit breakdown and damage without the need to configure a lithium battery protection circuit, simplifying the hardware design; and since the power circuit is powered by the battery voltage, the switching transistor inside the access selection circuit only needs to bear the energy consumption of the control circuit, reducing the power of the switching transistor, thereby reducing the size and cost. Attached Figure Description

[0051] To more clearly illustrate the technical utility model in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 A schematic diagram of a reverse polarity protection circuit provided in an embodiment of this application;

[0053] Figure 2 This is a schematic diagram of another structure of the reverse connection protection circuit provided in one embodiment of this application;

[0054] Figure 3 This is a schematic diagram of another structure of the reverse connection protection circuit provided in one embodiment of this application;

[0055] Figure 4 This is a schematic diagram of another structure of the reverse connection protection circuit provided in one embodiment of this application;

[0056] Figure 5 This is a schematic diagram of another structure of the reverse connection protection circuit provided in one embodiment of this application;

[0057] Figure 6 This is a schematic diagram of another structure of the reverse connection protection circuit provided in one embodiment of this application;

[0058] Figure 7 This is a partial example circuit diagram of a reverse connection protection circuit provided in an embodiment of this application. Detailed Implementation

[0059] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0060] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0061] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0063] Figure 1 A schematic diagram of the reverse connection protection circuit provided in a preferred embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0064] The aforementioned reverse connection protection circuit is connected to the battery 80 used to provide battery voltage and includes an access selection circuit 10, a control circuit 20, and a power circuit 30.

[0065] The access selection circuit 10 is connected to the battery 80 and is used to access the battery voltage. In response to the battery voltage being negative, it stops transmitting the battery voltage through the internal switching transistor to disconnect the output of the power supply voltage.

[0066] The control circuit 20, connected to the access selection circuit 10, is used to stop outputting control signals in response to the disconnection of the power supply voltage;

[0067] The power circuit 30, connected to the battery 80, the access selection circuit 10, and the control circuit 20, is used to stop converting the battery voltage into a drive voltage in response to the disconnection of a control signal, so as to stop the resistive load from working.

[0068] It should be noted that the control signal can be a PWM signal. The control circuit 20 may include a microprocessor.

[0069] like Figure 2 As shown, the above-mentioned reverse connection protection circuit also includes an indicator circuit 40.

[0070] The indicator circuit 40, connected to the battery 80, the power circuit 30 and the access selection circuit 10, is used to indicate in response to a negative battery voltage.

[0071] Through the above technical solution, the indicator circuit 40 provides an indication when the battery voltage is negative to alarm for reverse connection of the battery 80, thereby improving the safety of the reverse connection protection circuit.

[0072] like Figure 3 As shown, the above-mentioned reverse connection protection circuit also includes a charging circuit 50.

[0073] The charging circuit 50 is connected to the battery 80, the access selection circuit 10 and the power circuit 30, and is used to output a charging status signal in response to the access of the DC input.

[0074] The access selection circuit 10 is also used to transmit the battery voltage through the internal switching transistor and output the supply voltage to power the control circuit 20 in response to the battery voltage being positive.

[0075] The control circuit 20 is also used to output a first-level charging enable signal according to the charging status signal when the battery voltage is greater than or equal to the preset voltage.

[0076] The charging circuit 50 is also used to convert the input DC power into a charging voltage in response to a first-level charging enable signal;

[0077] Battery 80 is specifically used to charge the battery according to the charging voltage and output the battery voltage.

[0078] The charging voltage is equal to the battery voltage.

[0079] The control circuit 20 is also used to stop working when the battery voltage is lower than the preset voltage and to make the charging enable signal in a high impedance state.

[0080] The charging circuit 50 is also used to convert the input DC power into a trickle charging voltage in response to a high-impedance state charging enable signal, so as to trickle charge the battery 80.

[0081] When the battery voltage is greater than or equal to the preset voltage, the voltage difference between the input voltage (the voltage of the input DC power) and the output voltage (i.e., the battery voltage) of the charging circuit 50 is small, and the internal loss of the charging circuit 50 is the product of the voltage difference and the output current of the charging circuit 50, so normal charging (charging with a larger current) can be performed. At the same time, when the battery voltage is less than the preset voltage, the voltage difference between the input voltage (the voltage of the input DC power) and the output voltage (i.e., the battery voltage) of the charging circuit 50 is large, so trickle charging is performed on the battery 80 to reduce the possibility of large internal losses in the charging circuit 50.

[0082] like Figure 4 As shown, the above-mentioned reverse connection protection circuit also includes a gas pressure detection circuit 60.

[0083] The air pressure detection circuit 60 is connected to the control circuit 20 and is used to detect air pressure and output an air pressure detection signal.

[0084] The access selection circuit 10 is also used to access the battery voltage. In response to a positive battery voltage, the battery voltage is transmitted through the internal switching transistor to output the power supply voltage.

[0085] The control circuit 20 is also used to power on according to the supply voltage, output a control signal according to the air pressure detection signal, and output a second-level charging enable signal in response to the air pressure detection signal.

[0086] The power circuit 30 is also used to convert the battery voltage into a drive voltage according to the control signal so that the resistive load can operate according to the drive voltage;

[0087] The charging circuit 50 is also used to stop converting the input DC power into a charging voltage in response to the disconnection of the second-level charging enable signal, so as to stop charging the battery 80.

[0088] The polarity of the first level is opposite to that of the second level.

[0089] With the above technical solution, when applied to an atomizing device, the reverse connection protection circuit can convert the battery voltage into a driving voltage when the air pressure is lower than the preset air pressure, so that the resistive load can work according to the driving voltage. When the power circuit 30 is performing voltage conversion, it stops charging the battery 80, reducing the possibility of the battery 80 being charged and discharged at the same time, and improving the reliability and safety of the reverse connection protection circuit.

[0090] like Figure 5 As shown, the above-mentioned reverse connection protection circuit also includes a sampling circuit 70.

[0091] The sampling circuit 70, connected to the resistive load 90 and the power circuit 30, is used to sample the drive voltage and output a sampling signal.

[0092] The control circuit 20 is specifically used to power on according to the supply voltage, output a control signal according to the air pressure detection signal and the sampling signal, and output a second-level charging enable signal in response to the air pressure detection signal.

[0093] Voltage feedback has been established by sampling the drive voltage, which improves the stability of the drive voltage.

[0094] like Figure 6 As shown, the control circuit 20 is also used to output a display signal and a display enable signal based on the air pressure detection signal; the above-mentioned reverse connection protection circuit also includes a switch circuit 01 and a display circuit 02.

[0095] Switching circuit 01, connected to access selection circuit 10 and control circuit 20, is used to transmit power supply voltage according to display enable signal;

[0096] The display circuit 02 is connected to the switch circuit 01 and the control circuit 20, and is used to power on according to the power supply voltage and to display according to the display signal.

[0097] Through the above technical solution, when the air pressure is lower than the preset air pressure, the power circuit 30 converts the battery voltage into a driving voltage so that the resistive load works according to the driving voltage, while the display circuit 02 displays, thus enriching the product's functions; and the switching circuit 01 can transmit the power supply voltage to make the display circuit 02 work only when the air pressure is lower than the preset air pressure, thus saving energy.

[0098] Figure 7 The diagram illustrates a partial example circuit structure of the reverse connection protection circuit provided in an embodiment of the present invention. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown, and are described in detail below:

[0099] The access selection circuit 10 includes a first field-effect transistor M1 and a first resistor R1; wherein, the switching transistor inside the access selection circuit 10 is the first field-effect transistor M1;

[0100] The source of the first field-effect transistor M1 and the first end of the first resistor R1 are connected and together form the input terminal of the access selection circuit 10, which is connected to the battery 80 to receive the battery voltage; the drain of the first field-effect transistor M1 forms the output terminal of the access selection circuit 10, which is connected to the control circuit 20 to output the power supply voltage; the gate of the first field-effect transistor M1 and the second end of the first resistor R1 are connected to the power supply ground.

[0101] The access selection circuit 10 has a simple hardware structure and low cost.

[0102] The control circuit 20 includes a microprocessor U1, a first capacitor C1, and a second resistor R2;

[0103] The power supply terminal VCC of microprocessor U1 is connected to the first terminal of the first capacitor C1 and the first terminal of the second resistor R2; the second terminal of the second resistor R2 constitutes the power supply terminal of control circuit 20, which is connected to the access selection circuit 10 to receive the supply voltage; the first general-purpose input / output terminal PA2 of microprocessor U1 constitutes the control signal output terminal of control circuit 20, which is connected to power circuit 30 to output a control signal; the second general-purpose input / output terminal PA4 of microprocessor U1 constitutes the charging enable signal output terminal of control circuit 20, which is connected to charging circuit 50 to output a charging enable signal; the third general-purpose input / output terminal PA7 of microprocessor U1 constitutes the charging status signal input terminal of control circuit 20, which is connected to charging circuit 50 to receive the charging status signal. The fourth general-purpose input / output terminal PA0 of the microprocessor U1 constitutes the sampling signal input terminal of the control circuit 20 and is connected to the sampling circuit 70 to receive the sampling signal; the fifth general-purpose input / output terminal PA12 of the microprocessor U1 constitutes the air pressure detection signal input terminal of the control circuit 20 and is connected to the air pressure detection circuit 60 to receive the air pressure detection signal; the sixth general-purpose input / output terminal PA5 of the microprocessor U1 constitutes the display enable signal output terminal of the control circuit 20 and is connected to the switch circuit 01 to output the display enable signal; the seventh general-purpose input / output terminal PA6 and the eighth general-purpose input / output terminal PA7 of the microprocessor U1 constitute the display signal output terminal of the control circuit 20 and are connected to the display circuit 02 to output the display signal.

[0104] The charging circuit 50 includes a linear charger U2, a second capacitor C2, a third resistor R3, and a fourth resistor R4. The power input terminal IN of the linear charger U2 constitutes the DC power input terminal of the charging circuit 50 to receive DC power. The charging status output terminal CHRG of the linear charger U2 constitutes the charging status signal output terminal of the charging circuit 50 to output a charging status signal. The charging current program terminal ISET of the linear charger U2 is connected to the first terminal of the third resistor R3. The ground terminal GND of the linear charger U2, the first terminal of the second capacitor C2, and the first terminal of the fourth resistor R4 are all connected to the power ground. The second terminals of the third resistor R3 and the second terminals of the fourth resistor R4 are connected and together constitute the charging enable signal input terminal of the charging circuit 50, which is connected to the control circuit 20 to receive the charging enable signal. The battery terminal BAT of the linear charger U2 and the second terminal of the second capacitor C2 are connected and together constitute the battery voltage output terminal of the charging circuit 50, which is connected to the battery 80, the access selection circuit 10, and the power circuit 30 to output the battery voltage.

[0105] It is understandable that by setting the charging enable signal to the first level, the second level, or the high impedance state, different levels of current can flow into the charging current program terminal ISET of the linear charger U2. The linear charger U2 can detect this current and enter different working states (such as normal current output, trickle output, and circuit disconnection output).

[0106] The power circuit 30 includes a second field-effect transistor M2, a fifth resistor R5, and a sixth resistor R6. The source of the second field-effect transistor M2 and the first end of the fifth resistor R5 are connected and together form the input terminal of the power circuit 30, which is connected to the battery 80 and the access selection circuit 10 to receive the battery voltage. The drain of the second field-effect transistor M2 forms the output terminal of the power circuit 30 and is connected to a resistive load to output a drive voltage. The gate of the first field-effect transistor M1 is connected to the second end of the fifth resistor R5 and the first end of the sixth resistor R6. The second end of the sixth resistor R6 forms the control terminal of the power circuit 30 and is connected to the control circuit 20 to receive the control signal.

[0107] The air pressure detection circuit 60 includes an air pressure sensor U3, a microphone MIC, a third capacitor C3, and a seventh resistor R7. The power supply terminal VDD of the air pressure sensor U3 is connected to the first terminal of the third capacitor C3 and the first terminal of the seventh resistor R7. The switching terminal SW of the air pressure sensor U3 is connected to the positive terminal of the microphone MIC. The ground terminal GND of the air pressure sensor U3, the negative terminal of the microphone MIC, and the second terminal of the third capacitor C3 are all connected to the power supply ground. The output terminal OUT of the air pressure sensor U3 constitutes the output terminal of the air pressure detection circuit 60 and is connected to the control circuit 20 to output an air pressure detection signal.

[0108] The sampling circuit 70 includes an eighth resistor R8 and a ninth resistor R9; the first end of the eighth resistor R8 forms the input terminal of the sampling circuit 70, which is connected to the resistive load and the power circuit 30 to receive the driving voltage; the second end of the eighth resistor R8 and the first end of the ninth resistor R9 are connected and together form the output terminal of the sampling circuit 70, which is connected to the control circuit 20 to output the sampling signal; the second end of the ninth resistor R9 is connected to the power supply ground.

[0109] The switching circuit 01 includes a third field-effect transistor M3 and a tenth resistor R10. The source of the third field-effect transistor M3 and the first end of the tenth resistor R10 are connected and together form the input terminal of the switching circuit 01, which is connected to the switching circuit 01 to receive the power supply voltage. The drain of the third field-effect transistor M3 forms the output terminal of the switching circuit 01, which is connected to the display to output the transmitted power supply voltage. The gate of the third field-effect transistor M3 and the second end of the tenth resistor R10 are connected and together form the control terminal of the switching circuit 01, which is connected to the control circuit 20 to receive the display enable signal.

[0110] The indicator circuit 40 includes a light-emitting diode (LED) and an eleventh resistor (R11). The positive terminal of the LED forms the input terminal of the indicator circuit 40 and is connected to the battery 80 and the access selection circuit 10 to receive the battery voltage. The negative terminal of the LED is connected to the first terminal of the eleventh resistor (R11), and the second terminal of the eleventh resistor (R11) is connected to the power supply ground.

[0111] The following is based on the working principle. Figure 7 Further explanation is provided below:

[0112] Battery 80 outputs battery voltage. When battery 80 is reverse-connected, the battery voltage is negative, and the gate-source voltage of the first field-effect transistor M1 is positive. Due to the PMOS transistor of the first field-effect transistor M1, the first field-effect transistor M1 is turned off and stops transmitting battery voltage, thereby disconnecting the output of the supply voltage. The power supply terminal VCC of microprocessor U1 disconnects the input of the supply voltage, microprocessor U1 stops working and stops outputting control signals from the first general-purpose input / output terminal PA2 of microprocessor U1 to the gate of the second field-effect transistor M2. The second field-effect transistor M2 is turned off and stops converting the battery voltage into a drive voltage, thereby stopping the resistive load from working.

[0113] In one embodiment, the power input terminal IN of the linear charger U2 is connected to an input DC power supply. In response to the input DC power supply, the linear charger U2 outputs a charging status signal from its charging status output terminal CHRG to the third general-purpose input / output terminal PA7 of the microprocessor U1. Based on the charging status signal, the microprocessor U1 outputs a first-level charging enable signal from its second general-purpose input / output terminal PA4 to the charging current program terminal ISET of the linear charger U2. In response to the first-level charging enable signal, the linear charger U2 converts the input DC power supply into a charging voltage and outputs it from its battery terminal BAT to the battery 80. The battery 80 charges according to the charging voltage and outputs a battery voltage. It should be noted that the charging voltage is equal to the battery voltage. If the battery voltage is less than a preset voltage, the microprocessor U1 stops working and sets the charging enable signal to a high-impedance state. In response to the high-impedance charging enable signal, the linear charger U2 converts the input DC power supply into a trickle charging voltage and outputs it from its battery terminal BAT to the battery 80. The battery 80 charges according to the trickle charging voltage.

[0114] In another embodiment, a pressure sensor U3 and a microphone MIC detect the air pressure, outputting a pressure detection signal from the output terminal OUT of the pressure sensor U3 to the fifth general-purpose input / output terminal PA12 of the microprocessor U1. When the battery 80 is positively connected, the gate-source voltage of the first field-effect transistor M1 is negative. Due to the PMOS transistor of the first field-effect transistor M1, the first field-effect transistor M1 is turned on and transmits the battery voltage as the output of the supply voltage. The microprocessor U1 is powered on according to the supply voltage and outputs a control signal from the first general-purpose input / output terminal PA2 of the microprocessor U1 to the gate of the first field-effect transistor M1 according to the air pressure detection signal. In response to the air pressure detection signal, the microprocessor U1 outputs a second-level charging enable signal from the second general-purpose input / output terminal PA4 to the charging current program terminal ISET of the linear charger U2. The first field-effect transistor M1 converts the battery voltage into a drive voltage according to the control signal, so that the resistive load operates according to the drive voltage. In response to the second-level charging enable signal, the linear charger U2 stops converting the input DC power into a charging voltage, thereby stopping the charging of the battery 80.

[0115] This utility model embodiment also provides an atomizing device, which includes the above-described reverse connection protection circuit.

[0116] This utility model embodiment also provides an electronic device, which includes the above-described reverse connection protection circuit.

[0117] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0118] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A reverse connection protection circuit, characterized in that, Connected to a battery used to provide battery voltage, including: The access selection circuit is connected to the battery and is used to access the battery voltage. In response to the battery voltage being negative, it stops transmitting the battery voltage through the internal switching transistor to disconnect the output of the power supply voltage. A control circuit, connected to the access selection circuit, is used to stop outputting control signals in response to the disconnection of the power supply voltage; A power circuit, connected to the battery, the access selection circuit, and the control circuit, is used to stop converting the battery voltage into a drive voltage in response to the disconnection of the control signal, so as to stop the resistive load from operating.

2. The reverse connection protection circuit as described in claim 1, characterized in that, Also includes: An indicator circuit, connected to the battery, the power circuit, and the access selection circuit, is used to indicate when the battery voltage is negative.

3. The reverse connection protection circuit as described in claim 1, characterized in that, Also includes: A charging circuit, connected to the battery, the access selection circuit, and the power circuit, is used to output a charging status signal in response to the input of DC power. The access selection circuit is also used to transmit the battery voltage through an internal switching transistor and output the power supply voltage in response to the battery voltage being positive, so as to power the control circuit. The control circuit is also used to output a first-level charging enable signal according to the charging status signal when the battery voltage is greater than or equal to a preset voltage. The charging circuit is also used to convert the input DC power into a charging voltage in response to the charging enable signal of the first level. The battery is specifically used to charge according to the charging voltage and output the battery voltage; The charging voltage is equal to the battery voltage; The control circuit is also used to stop working when the battery voltage is lower than the preset voltage, and to make the charging enable signal in a high-impedance state. The charging circuit is also configured to convert the input DC power into a trickle charging voltage in response to the charging enable signal in a high-impedance state, so as to trickle charge the battery.

4. The reverse connection protection circuit as described in claim 3, characterized in that, Also includes: A pressure detection circuit, connected to the control circuit, is used to detect the pressure and output a pressure detection signal. The control circuit is also configured to power on according to the supply voltage, output the control signal according to the air pressure detection signal, and output the charging enable signal of the second level in response to the air pressure detection signal; The power circuit is also used to convert the battery voltage into the drive voltage according to the control signal, so that the resistive load operates according to the drive voltage; The charging circuit is also configured to stop converting the input DC power into a charging voltage in response to the second-level charging enable signal, thereby stopping the charging of the battery; The polarity of the first level is opposite to that of the second level.

5. The reverse connection protection circuit as described in claim 4, characterized in that, Also includes: A sampling circuit, connected to the resistive load and the power circuit, is used to sample the driving voltage and output a sampling signal. The control circuit is specifically used to power on according to the supply voltage, output the control signal according to the air pressure detection signal and the sampling signal, and output the charging enable signal of the second level in response to the air pressure detection signal.

6. The reverse connection protection circuit as described in claim 4, characterized in that, The control circuit is also used to output a display signal and a display enable signal based on the air pressure detection signal; The reverse connection protection circuit also includes: A switching circuit, connected to the access selection circuit and the control circuit, is used to transmit the power supply voltage according to the display enable signal; The display circuit is connected to the switching circuit and the control circuit, and is used to power on according to the power supply voltage and to display according to the display signal.

7. The reverse connection protection circuit as described in any one of claims 1 to 6, characterized in that, The access selection circuit includes a first field-effect transistor and a first resistor; wherein, the switching transistor inside the access selection circuit is the first field-effect transistor; The source of the first field-effect transistor and the first end of the first resistor are connected and together form the input terminal of the access selection circuit, which is connected to the battery to receive the battery voltage; The drain of the first field-effect transistor forms the output terminal of the access selection circuit, which is connected to the control circuit to output the supply voltage; The gate of the first field-effect transistor and the second terminal of the first resistor are both connected to the power supply ground.

8. The reverse connection protection circuit as described in claim 1, characterized in that, The control circuit includes a microprocessor, a first capacitor, and a second resistor. The power supply terminal of the microprocessor is connected to the first terminal of the first capacitor and the first terminal of the second resistor. The second end of the second resistor constitutes the power supply terminal of the control circuit and is connected to the access selection circuit to receive the power supply voltage; The first general-purpose input / output terminal of the microprocessor constitutes the control signal output terminal of the control circuit, and is connected to the power circuit to output the control signal; The second general-purpose input / output terminal of the microprocessor constitutes the charging enable signal output terminal of the control circuit, and is connected to the charging circuit to output the charging enable signal. The third general-purpose input / output terminal of the microprocessor constitutes the charging status signal input terminal of the control circuit and is connected to the charging circuit to receive the charging status signal. The fourth general-purpose input / output terminal of the microprocessor constitutes the sampling signal input terminal of the control circuit and is connected to the sampling circuit to receive the sampling signal; The fifth general-purpose input / output terminal of the microprocessor constitutes the air pressure detection signal input terminal of the control circuit and is connected to the air pressure detection circuit to receive the air pressure detection signal. The sixth general-purpose input / output terminal of the microprocessor constitutes the display enable signal output terminal of the control circuit, and is connected to the switching circuit to output the display enable signal. The seventh and eighth general-purpose input / output terminals of the microprocessor constitute the display signal output terminal of the control circuit, which is connected to the display circuit to output a display signal.

9. An atomizing device, characterized in that, The atomizing device includes the reverse connection protection circuit as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, The electronic device includes a reverse connection protection circuit as described in any one of claims 1 to 8.

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