Power supply circuit and emergency device

Abstract

The application provides a power supply circuit and an emergency device. The power supply circuit comprises: a switching circuit having a first interface end connected to an energy storage component and a second interface end connected to a load; a power supply module configured to provide a working power supply; a driving circuit connected to the switching circuit and the power supply module, in a working state, the driving circuit is configured to output a first driving signal converted from the working power supply to the switching circuit to indicate the switching circuit to switch to a conducting state; and a protection circuit configured to indicate the driving circuit to switch to a standby state when a signal voltage of the first driving signal is less than a target voltage, the driving circuit is configured to output a second driving signal to the switching circuit in the standby state to indicate the switching circuit to switch to an off state. Thus, when the voltage of the working power supply is insufficient, the driving circuit keeps outputting the second driving signal, and the switching circuit keeps off, thereby avoiding forcibly turning on the switching circuit by the first driving signal in the case that the voltage of the first driving signal is insufficient, and causing the switching circuit to malfunction.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a power supply circuit and emergency equipment. Background Technology

[0002] In the use of motor vehicles, the vehicle's battery needs to provide starting current to start the engine. However, when the battery is low on power, it cannot provide starting current. Therefore, in such cases, emergency equipment is needed to provide emergency power to the vehicle's battery.

[0003] The power supply circuit of emergency equipment is usually controlled by electronic switches (such as MOSFETs). However, if the power module is low in power or the temperature is low, forcibly turning on the MOSFET will cause the power supply circuit to malfunction, such as causing the MOSFET to explode. These malfunctions may damage the emergency equipment or even cause a fire, which will hinder and endanger the user's use. Utility Model Content

[0004] The main purpose of this application is to provide a power supply circuit and emergency equipment, which aims to improve the power supply safety of the power supply circuit.

[0005] In a first aspect, this application provides a power supply circuit, including:

[0006] A switching circuit has a first interface terminal for connecting an energy storage component and a second interface terminal for connecting a load, and the switching circuit has a switchable off state and an on state. In the on state, the first interface terminal and the second interface terminal are connected.

[0007] The power module is used to provide operating power.

[0008] The driving circuit is connected to the switching circuit and the power supply module. The driving circuit has a switchable working state and a standby state. In the working state, the driving circuit can output a first driving signal to the switching circuit to indicate that the switching circuit switches to the conducting state. The first driving signal is obtained by the working power supply.

[0009] A protection circuit, connected to the drive circuit, is used to output a protection signal to the drive circuit when the signal voltage of the first drive signal is less than the target voltage, so as to indicate that the drive circuit switches to standby mode. In standby mode, the drive circuit outputs a second drive signal to the switch circuit to indicate that the switch circuit switches to off mode.

[0010] In some implementations, the drive circuit includes:

[0011] The voltage conversion circuit has its input terminal connected to the power supply module and its output terminal connected to the switching circuit. The voltage conversion circuit is used to perform voltage conversion processing on the working power supply to obtain a first drive signal, and outputs the first drive signal from the output terminal of the voltage conversion circuit to the switching circuit.

[0012] The grounding switch circuit has its first terminal connected to the output terminal of the voltage conversion circuit, and its second terminal grounded.

[0013] The trigger circuit is connected to the grounding switch circuit and is used to output a switching signal to the grounding switch circuit in response to the input trigger signal. The switching signal is used to indicate to the grounding switch circuit to switch the connection between the first terminal and the second terminal.

[0014] Under the condition that the protection circuit outputs a protection signal, the first and second terminals of the grounding switch circuit are connected and do not respond to the switching signal.

[0015] In some implementations, the protection circuit includes:

[0016] Zener diode, the cathode of which is connected to the output terminal of the voltage conversion circuit;

[0017] The first switching transistor has its first terminal connected to the output terminal of the voltage conversion circuit, its second terminal grounded, and its controlled terminal connected to the anode of the Zener diode.

[0018] The second switch has its first terminal connected to the controlled terminal of the grounding switch circuit, its second terminal grounded, and its controlled terminal connected to its first terminal.

[0019] In some implementations, the protection circuit also includes a protection resistor, through which the anode of the Zener diode is grounded.

[0020] In some implementations, the grounding switch circuit includes a third switching transistor, a first voltage divider resistor, and a second voltage divider resistor;

[0021] The first terminal of the third switching transistor is connected to the switching circuit and to the output terminal of the voltage conversion circuit through the first voltage divider resistor. The second terminal of the third switching transistor is grounded. The controlled terminal of the third switching transistor is connected to the trigger circuit and to the output terminal of the voltage conversion circuit through the second voltage divider resistor.

[0022] In some implementations, the third switch is a P-channel MOSFET.

[0023] In some implementations, the drive circuit further includes a voltage regulator circuit connected between the power supply module and the input terminal of the voltage conversion circuit. The voltage regulator circuit is used to regulate the operating power supplied by the power supply module and input it to the voltage conversion circuit.

[0024] In some implementations, the power module includes:

[0025] Internal power supply; or,

[0026] The power interface circuit has one end connected to the drive circuit and the other end used to connect to an external power source.

[0027] In some implementations, during operation, the drive circuit can also output a third drive signal to the power supply switch signal to indicate that the switch circuit switches to the off state.

[0028] In some implementations, in the off state, the first interface terminal and the second interface terminal of the switching circuit are turned off.

[0029] Secondly, this application also provides a power supply circuit, comprising:

[0030] A switching circuit has a first interface terminal for connecting an energy storage component and a second interface terminal for connecting a load, and the switching circuit has a switchable off state and an on state. In the on state, the first interface terminal and the second interface terminal are connected.

[0031] The power module is used to provide operating power.

[0032] The driving circuit is connected to the switching circuit and the power supply module. The driving circuit can output a first driving signal to the switching circuit to indicate that the switching circuit switches to the on state. The first driving signal is obtained by conversion from the working power supply.

[0033] A protection circuit, connected to the drive circuit, is used to output a protection signal to the drive circuit when the signal voltage of the first drive signal is less than the target voltage, so as to indicate that the drive circuit should not output the first drive signal.

[0034] Thirdly, this application also provides an emergency device, including a housing, an energy storage component, and a power supply circuit as provided in any embodiment of this application, wherein at least a portion of the energy storage component and the power supply circuit are disposed within the housing.

[0035] In summary, embodiments of this application provide a power supply circuit and an emergency device. One power supply circuit includes: a switching circuit having a first interface terminal for connecting an energy storage component and a second interface terminal for connecting a load, and the switching circuit having a switchable off state and an on state. In the on state, the first interface terminal and the second interface terminal are connected; a power module for providing operating power; a drive circuit connected to the switching circuit and the power module, the drive circuit having a switchable operating state and a standby state, and in the operating state, the drive circuit can output a first drive signal to the switching circuit to indicate that the switching circuit switches to the on state, wherein the first drive signal is obtained by converting the operating power; and a protection circuit connected to the drive circuit for outputting a protection signal to the drive circuit when the signal voltage of the first drive signal is less than the target voltage, to indicate that the drive circuit switches to the standby state, and in the standby state, the drive circuit outputs a second drive signal to the switching circuit to indicate that the switching circuit switches to the off state. In the power supply circuit provided in this application embodiment, the switching circuit can switch to an off state or an on state based on the driving signal output by the driving circuit. When the voltage of the working power supply provided by the power module is insufficient, the protection circuit outputs a protection signal to the driving circuit to indicate that the driving circuit switches to a standby state, so that the driving circuit continues to output the second driving signal and the switching circuit remains off, thereby avoiding the failure of the switching circuit caused by forcibly using the first driving signal to turn on the switching circuit when the voltage of the first driving signal is insufficient. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic diagram of a power supply circuit according to an embodiment of this application;

[0038] Figure 2 This is a schematic diagram illustrating an application scenario of a power supply circuit provided in one embodiment of this application.

[0039] Figure 3 This is a schematic diagram illustrating an application scenario of another embodiment of the power supply circuit provided in one embodiment of this application;

[0040] Figure 4 A schematic diagram of another embodiment of the power supply circuit provided in one embodiment of this application;

[0041] Figure 5 A schematic diagram of another embodiment of the power supply circuit provided in this application;

[0042] Figure 6 A schematic diagram of the circuit structure of the grounding switch circuit and the protection circuit in one embodiment of the power supply circuit provided in this application;

[0043] Figure 7 This is a schematic diagram of a module of an implementation of an emergency device provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Power supply circuit; 10. Switching circuit; 11. First interface terminal; 12. Second interface terminal; 20. Power module; 21. Internal power supply; 22. Power interface circuit; 30. Drive circuit; 31. Voltage conversion circuit; 32. Grounding switch circuit; 33. Trigger circuit; 34. Voltage regulator circuit; 40. Protection circuit;

[0046] 200. Emergency equipment; 300. Energy storage components; 400. Housing; 500. Controller; 600. Triggering components; 700. Target load;

[0047] ZD1, Zener diode; Q1, first switching transistor; Q2, second switching transistor; Q3, third switching transistor; R1, first voltage divider resistor; R2, second voltage divider resistor; R3, protection resistor. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0050] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] Please refer to the following first. Figures 1 to 3 , Figure 1 This is a schematic diagram of a module of a power supply circuit according to an embodiment of this application. Figure 2 This is a schematic diagram illustrating an application scenario of a power supply circuit provided in one embodiment of this application. Figure 3This is a schematic diagram illustrating an application scenario of another embodiment of the power supply circuit provided in one embodiment of this application.

[0052] Specifically, when the energy storage component 300 is connected to the target load 700, the power supply circuit 100 can connect the connection circuit between the energy storage component 300 and the target load 700 to supply the power output of the energy storage component 300 to the target load 700. For example, if the target load 700 is a car battery, the energy storage component 300 can provide emergency power or charge the car battery.

[0053] Furthermore, the car battery can be a rechargeable battery or a supercapacitor. Rechargeable batteries include, but are not limited to, sodium batteries, lithium batteries, and lead-acid batteries.

[0054] like Figures 1 to 3 As shown, the power supply circuit 100 provided in the first aspect embodiment of this application includes a switching circuit 10, a power module 20, a drive circuit 30, and a protection circuit 40. The specific implementation of each circuit will be described below.

[0055] The switching circuit 10 has a first interface terminal 11 for connecting to the energy storage component 300 and a second interface terminal 12 for connecting to a load. The switching circuit 10 has a switchable off state and an on state. In the on state, the first interface terminal 11 and the second interface terminal 12 of the switching circuit 10 are connected. By way of example and not limitation, in the off state, the first interface terminal 11 and the second interface terminal 12 of the switching circuit 10 are turned off.

[0056] As one embodiment, the switching circuit 10 can be switched to the on state under the instruction of the first driving signal. As another embodiment, the switching circuit 10 can be switched to the on state under the instruction of the second driving signal. The first and second driving signals can be provided by the driving circuit 30, as detailed in the subsequent description of the driving circuit 30.

[0057] In one embodiment, the switching circuit 10 can be connected to the energy storage component 300 through the first interface terminal 11, and the switching circuit 10 can be connected to the target load 700 through the second interface terminal 12. When both the energy storage component 300 and the switching circuit 10 are connected to the switching circuit 10, if the switching circuit 10 is switched to the on state, the power supply current output by the energy storage component 300 can flow into the switching circuit 10 through the first interface terminal 11 and flow to the target load 700 through the second interface terminal 12 to provide emergency power or charge the target load 700. Conversely, if the switching circuit 10 is switched to the off state, the power supply current output by the energy storage component 300 cannot provide emergency power or charge the target load 700.

[0058] As one embodiment, the switching circuit 10 includes an electronically controlled switching unit, such as a MOSFET or a transistor, wherein the two ends of the switching unit are the first interface terminal 11 and the second interface terminal 12 of the switching circuit 10, respectively. Furthermore, the switching circuit 10 may include one switching unit, or it may include two, three, or more switching units connected in parallel.

[0059] The power module 20 provides operating power, and the drive circuit 30 is connected to the switch circuit 10 and the power module 20. The drive circuit 30 has switchable operating and standby states. In the operating state, the drive circuit 30 outputs a first drive signal to the switch circuit 10 to indicate that the switch circuit 10 switches to the on state. The first drive signal is obtained by converting the operating power supply. In the standby state, the drive circuit 30 outputs a second drive signal to the switch circuit 10 to indicate that the switch circuit 10 switches to the off state.

[0060] As one embodiment, the drive circuit 30 is used to convert the operating power supply into a first drive signal. As another embodiment, the first drive signal may also be obtained by converting the operating power supply through other circuits in the power supply circuit 100.

[0061] As one embodiment, when the switching circuit 10 includes a switching unit, the driving circuit 30 is connected to the controlled terminal of the switching unit and is used to output a first driving signal and a second driving signal to the controlled terminal to switch the switching unit on and off.

[0062] The protection circuit 40 is connected to the drive circuit 30 and is used to output a protection signal to the drive circuit 30 when the signal voltage of the first drive signal is less than the target voltage, so as to indicate that the drive circuit 30 switches to the standby state, so that the drive circuit 30 in the standby state outputs a second drive signal to the switch circuit 10 to indicate that the switch circuit 10 switches to the off state.

[0063] In some implementations, during operation, the drive circuit 30 may also output a third drive signal to the power supply switch signal to indicate that the switch circuit 10 switches to the off state.

[0064] Specifically, in operation, the drive circuit 30 can output either a first drive signal or a third drive signal to the power supply switch signal based on user input, to indicate the on / off state of the switch circuit 10. It should be understood that even if the drive circuit 30 does not output the first drive signal to the switch circuit 10, it can still be considered as the drive circuit 30 outputting the third drive signal to the switch circuit 10.

[0065] As one embodiment, the second driving signal and the third driving signal can be the same signal output by the driving circuit 30, both used to indicate that the switching circuit 10 switches to the off state. For example, the second driving signal and the third driving signal can both be low-level signals.

[0066] It should be noted that since the first drive signal is obtained by converting the operating power supply, the signal voltage of the first drive signal matches the power supply voltage. Specifically, when the power supply voltage decreases, the signal voltage of the first drive signal will decrease accordingly. Furthermore, when the signal voltage of the first drive signal is less than the target voltage, the voltage value of the first drive signal will be insufficient to turn on the switching circuit 10.

[0067] It should also be noted that the signal voltage of the first drive signal can be detected by the protection circuit 40, or it can be detected by the controller 500 in the power supply circuit 100 (e.g., Figure 4 It can be detected by the sampling circuit / detection circuit additionally set in the power supply circuit 100.

[0068] The power supply circuit 100 typically includes an electronically controlled switching unit. This switching unit is controlled to turn on by a first driving signal output from the drive circuit 30. However, when the power supply voltage provided by the power module 20 is insufficient, the signal voltage of the first driving signal will also be low. Forcibly turning on the switching unit using the first driving signal at this time will cause a malfunction in the power supply circuit 100. These malfunctions may damage the emergency equipment 200 or even cause a fire, hindering and endangering the user's operation. Additionally, the power module 20 can be an internal power supply 21 or a power interface circuit 22 for connecting to an external power supply. Insufficient power or low temperature of the aforementioned power supply may lead to insufficient power supply voltage provided by the power module 20, resulting in the signal voltage of the first driving signal being lower than the target voltage.

[0069] For example, the switching unit includes a MOSFET, and the driving circuit 30 is connected to the gate of the MOSFET to control the switching between the source and drain of the MOSFET. When the voltage strength of the first driving signal input to the gate is too low, the voltage between the gate and source of the MOSFET is insufficient, and the MOSFET may explode.

[0070] Based on this, in the power supply circuit 100 provided in this application embodiment, when the voltage of the working power supply provided by the power module 20 is insufficient, the protection circuit 40 outputs a protection signal to the drive circuit 30 to instruct the drive circuit 30 to switch to standby mode, so that the drive circuit 30 continues to output the second drive signal and the switch circuit 10 remains closed, thereby avoiding the switch circuit 10 from being forcibly turned on by the first drive signal when the voltage of the first drive signal is insufficient, which would cause the switch circuit 10 to malfunction and improve the power supply safety of the power supply circuit 100.

[0071] In addition, the controller 500 in this application embodiment may include a programmable logic controller (PLC), a central processing unit (CPU), a microcontroller unit (MCU), other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The above are merely examples; any module that can implement the function of the controller 500 falls within the protection scope of this application embodiment.

[0072] like Figure 4 As shown, in some embodiments, the drive circuit 30 includes:

[0073] The voltage conversion circuit 31 has its input terminal connected to the power supply module 20 and its output terminal connected to the switching circuit 10. The voltage conversion circuit 31 is used to perform voltage conversion processing on the working power supply to obtain a first drive signal, and outputs the first drive signal from the output terminal of the voltage conversion circuit 31 to the switching circuit 10.

[0074] Grounding switch circuit 32, the first terminal of grounding switch circuit 32 is connected to the output terminal of voltage conversion circuit 31, and the second terminal of grounding switch circuit 32 is grounded;

[0075] Trigger circuit 33 is connected to grounding switch circuit 32 and is used to output switching signal to grounding switch circuit 32 in response to input trigger signal. The switching signal is used to indicate to grounding switch circuit 32 to switch the connection between the first terminal and the second terminal.

[0076] When the protection circuit 40 outputs a protection signal, the first and second terminals of the grounding switch circuit 32 are connected and do not respond to the switching signal.

[0077] First, it should be noted that the voltage conversion circuit 31 is used to convert the working power supply to obtain the first drive signal. Therefore, the signal strength of the first drive signal is matched with the signal strength of the working power supply. When the power supply voltage of the working power supply drops, the signal voltage of the first drive signal drops accordingly. When the signal voltage of the first drive signal is less than the target voltage, the first drive signal is insufficient to turn on the switching circuit 10.

[0078] Specifically, when the first and second terminals of the grounding switch circuit 32 are connected, the output terminal of the voltage conversion circuit 31 is grounded through the grounding switch circuit 32. The first drive signal output by the voltage conversion circuit 31 will flow to the ground and will not be input to the switch circuit 10. It should be understood that the drive circuit 30 does not output the first drive signal to the switch circuit 10, which can also be regarded as the drive circuit 30 outputting the second drive signal to the switch circuit 10.

[0079] When the first and second terminals of the grounding switch circuit 32 are disconnected, the first drive signal and / or the second drive signal output by the voltage conversion circuit 31 will be input to the switch circuit 10 through the output terminal to control the conduction and disconnection between the first interface terminal 11 and the second interface terminal 12 of the switch circuit 10.

[0080] Furthermore, when the protection circuit 40 outputs a protection signal, the drive circuit 30 switches to standby mode. In standby mode, the first and second terminals of the grounding switch circuit 32 are connected, and it does not respond to the switching signal. Further, when the protection circuit 40 does not output a protection signal, the grounding switch circuit 32 resumes its response to the switching signal; that is, at this time, the grounding switch circuit 32 can switch the connection between the first and second terminals under the instruction of the switching signal.

[0081] In some embodiments, the controlled terminal of the grounding switch circuit 32 is connected to the protection circuit 40, and the protection signal output by the protection circuit 40 to the grounding switch circuit 32 is used to indicate that the first terminal and the second terminal of the grounding switch circuit 32 are turned off.

[0082] Specifically, the trigger signal is used to indicate whether the path between the first and second terminals of the grounding switch circuit 32 is open or closed. It should be noted that the trigger signal is generated based on the operation performed by the user. For example, the power supply circuit 100 also includes a controller 500, which is connected to the trigger circuit 33. The controller 500 is used to generate a trigger signal and output it to the trigger circuit 33 when the user performs a preset operation or receives an instruction output by the user.

[0083] like Figure 5 As shown, the power supply circuit 100 further includes a trigger component 600 electrically connected to the controller 500, which can be operated by the user to trigger the controller 500, wherein the trigger component 600 is, for example, a button.

[0084] Furthermore, the trigger signal includes a first trigger signal and a second trigger signal, and the switching signal includes a first switching signal corresponding to the first trigger signal and a second switching signal corresponding to the second trigger signal.

[0085] As one embodiment, the first trigger signal is generated based on the user's first trigger operation, and the second trigger signal is generated based on the user's second trigger operation. The first trigger operation and the second trigger operation can be different trigger operations of the user. For example, the user can generate the first trigger signal and the second trigger signal respectively by triggering different trigger components 600, or one of the first trigger signal and the second trigger signal can be generated based on the order in which the user triggers the same trigger component 600.

[0086] Specifically, when the drive circuit 30 is in operation: when the user performs the first trigger operation, the controller 500 generates a first trigger signal and outputs it to the trigger circuit 33. The trigger circuit 33 responds to the first trigger signal and outputs a first switching signal to the grounding switch circuit 32 to control the connection between the first and second terminals of the grounding switch circuit 32. When the user performs the second trigger operation, the controller 500 generates a second switching signal and outputs it to the trigger circuit 33. The trigger circuit 33 responds to the second trigger signal and outputs a second switching signal to the grounding switch circuit 32 to control the disconnection between the first and second terminals of the grounding switch circuit 32.

[0087] To further explain, when the first and second terminals of the grounding switch circuit 32 are disconnected, the first driving signal generated by the voltage conversion circuit 31 is input to the switch circuit 10. When the first and second terminals of the grounding switch circuit 32 are connected, the first driving signal generated by the voltage conversion circuit 31 flows to ground and cannot be input to the switch circuit 10. It should be understood that the driving circuit 30 does not output the first driving signal to the switch circuit 10, which can also be regarded as the driving circuit 30 outputting the second driving signal to the switch circuit 10.

[0088] For example, the first trigger signal is a high-level signal and the second trigger signal is a low-level signal; or, the first trigger signal is a low-level signal and the second trigger signal is a high-level signal. For example, the first switching signal is a high-level signal and the second switching signal is a low-level signal; or, the first switching signal is a low-level signal and the second switching signal is a high-level signal.

[0089] It should be understood that when the signal voltage of the first drive signal is less than the target voltage, the protection circuit 40 outputs a protection signal to the drive circuit 30, so that the first terminal and the second terminal of the grounding switch circuit 32 are connected and do not respond to the switching signal. Therefore, no matter whether the trigger circuit 33 outputs the first switching signal or the second switching signal to the grounding switch circuit 32, the grounding switch circuit 32 remains connected. The first drive signal output by the voltage conversion circuit 31 cannot be output to the switch circuit 10 through the output terminal, but flows to the ground through the grounding switch circuit 32. This avoids the situation where the switch circuit 10 is forcibly connected by the first drive signal when the voltage of the first drive signal is insufficient, which would cause the switch circuit 10 to fail.

[0090] like Figure 6 As shown, in some embodiments, the protection circuit 40 includes:

[0091] Zener diode ZD1, the cathode of Zener diode ZD1 is connected to the output terminal of voltage conversion circuit 31;

[0092] The first switch Q1 has its first terminal connected to the output terminal of the voltage conversion circuit 31, its second terminal grounded, and its controlled terminal connected to the anode of the Zener diode ZD1.

[0093] The second switch Q2 has its first terminal connected to the controlled terminal of the grounding switch circuit 32, its second terminal grounded, and its controlled terminal connected to its first terminal.

[0094] It should be noted that the Zener diode ZD1 has the characteristic that it will break down when the voltage drop between its cathode and anode exceeds the corresponding breakdown voltage. The breakdown voltage is matched to the specific type of Zener diode ZD1. In some embodiments, the breakdown voltage of the Zener diode ZD1 is equal to the target voltage.

[0095] It should also be noted that the protection signal output by the protection circuit 40 to the drive circuit 30 is specifically used to instruct the grounding switch circuit 32 in the drive circuit 30 to turn off. For example, if the controlled terminal of the grounding switch circuit 32 is turned on when it is at a high level and turned off when it is at a low level, then the protection signal output by the protection circuit 40 to the drive circuit 30 is specifically to output a low-level signal to the controlled terminal of the grounding switch circuit 32 / pull down the voltage of the controlled terminal.

[0096] As one embodiment, the first switch Q1 is turned on when the controlled terminal is at a high level and turned off when it is at a low level, and the second switch Q2 is turned on when the controlled terminal is at a high level and turned off when it is at a low level. For example, both the first switch Q1 and the second switch Q2 are NPN transistors.

[0097] Specifically, when the signal voltage of the first drive signal output by the voltage conversion circuit 31 is greater than or equal to the target voltage, the first drive signal can break down the Zener diode ZD1, making the cathode and anode of the Zener diode ZD1 conduct. At this time, the first drive signal flows through the Zener diode ZD1 to the controlled terminal of the first switch Q1, so that the first terminal and the second terminal of the first switch Q1 conduct. When the first terminal and the second terminal of the first switch Q1 conduct, the controlled terminal of the second switch Q2 is grounded. Therefore, the voltage of the controlled terminal of the second switch Q2 is pulled down, so that the first terminal and the second terminal of the second switch Q2 are turned off. Then the controlled terminal of the grounding switch circuit 32 is not grounded, and the voltage of the controlled terminal of the grounding switch circuit 32 will not be pulled down. The grounding switch circuit 32 can switch the connection between the first terminal and the second terminal in response to the switching signal.

[0098] When the signal voltage of the first drive signal output by the voltage conversion circuit 31 is less than the target voltage, the first drive signal cannot break down the Zener diode ZD1, causing an open circuit between the cathode and anode of the Zener diode ZD1. At this time, the first drive signal cannot flow through the Zener diode ZD1 to the controlled terminal of the first switch Q1, so the first terminal and the second terminal of the first switch Q1 are turned off. When the first terminal and the second terminal of the first switch Q1 are turned off, the voltage of the controlled terminal of the second switch Q2 will not be pulled down. The first drive signal output by the voltage conversion circuit 31 makes the first terminal and the second terminal of the second switch Q2 conduct, so the controlled terminal of the grounding switch circuit 32 is grounded, the voltage of the controlled terminal of the grounding switch circuit 32 is pulled down, the grounding switch circuit 32 remains off, and does not respond to the switching signal.

[0099] In some embodiments, the protection circuit 40 further includes a protection resistor R3, through which the anode of the Zener diode ZD1 is grounded.

[0100] Specifically, when the signal voltage of the first drive signal output by the voltage conversion circuit 31 is greater than or equal to the target voltage, the first drive signal breaks down the Zener diode ZD1. The first drive signal flows through the Zener diode ZD1 to the controlled terminal of the first switching transistor Q1. The protection resistor R3 set between the anode of the Zener diode ZD1 and ground can adjust the voltage at the controlled terminal of the first switching transistor Q1, avoiding excessive voltage at the controlled terminal of the first switching transistor Q1 from damaging the first switching transistor Q1, thereby improving the safety and durability of the protection circuit 40 and the power supply circuit 100.

[0101] In some embodiments, the grounding switch circuit 32 includes an electronically controlled third switch Q3, such as a MOSFET or a transistor. Specifically, the third switch Q3 has a first terminal, a second terminal, and a controlled terminal. The first terminal of the third switch Q3 is connected to the output terminal of the voltage conversion circuit 31, the second terminal of the third switch Q3 is grounded, and the controlled terminal of the third switch Q3 is connected to the protection circuit 40 and the trigger circuit 33.

[0102] As one embodiment, the third switch Q3 is turned on when the controlled terminal has a high-level signal and turned off when the controlled terminal has a low-level signal.

[0103] In some implementations, the third switch Q3 is a P-channel MOSFET.

[0104] In some embodiments, the grounding switch circuit 32 further includes a first voltage divider resistor R1 and a second voltage divider resistor R2;

[0105] The first terminal of the third switch Q3 is connected to the switching circuit 10 and to the output terminal of the voltage conversion circuit 31 through the first voltage divider resistor R1. The second terminal of the third switch Q3 is grounded. The controlled terminal of the third switch Q3 is connected to the trigger circuit 33 and to the output terminal of the voltage conversion circuit 31 through the second voltage divider resistor R2.

[0106] Specifically, the first voltage divider resistor R1 and the second voltage divider resistor R2 are used to perform voltage division processing on the first drive signal output by the voltage conversion circuit 31, so as to adjust the voltage difference between the first terminal and the controlled terminal of the third switch Q3 and improve the working stability of the third switch Q3.

[0107] For example, the resistance of the first voltage divider resistor R1 is 40-60KΩ, and the resistance of the second voltage divider resistor R2 is 90-110KΩ.

[0108] like Figure 5 As shown, in some embodiments, the drive circuit 30 further includes a voltage regulator circuit 34, which is connected between the power supply module 20 and the input terminal of the voltage conversion circuit 31. The voltage regulator circuit 34 is used to regulate the working power supplied by the power supply module 20 and input it to the voltage conversion circuit 31.

[0109] It should be understood that insufficient power in the power module 20 or low temperatures may cause instability in the power supply voltage input to the voltage conversion circuit 31, leading to instability in the signal voltage of the first drive signal converted by the voltage conversion circuit 31. Fluctuations in the first drive signal near the target voltage (e.g., when the power supply voltage fluctuates around 5V, the first drive signal voltage fluctuates around 12V) reduce the accuracy of the power supply circuit 100 in detecting the first drive signal voltage and cause the drive circuit 30 to repeatedly switch between operating and standby states, resulting in disordered switching of the switching circuit 10. Therefore, in this embodiment, a voltage regulator circuit 34 is used to regulate the power supply voltage, stabilizing the signal voltage of the first drive signal and preventing fluctuations in the first drive signal from causing repeated switching of the drive circuit 30 between operating and standby states or repeated switching of the switching circuit 10 between off and on states.

[0110] For example, the voltage regulator circuit 34 includes a voltage regulator capacitor with one end connected between the power module 20 and the input terminal of the voltage conversion circuit 31, and the other end grounded.

[0111] In some embodiments, the power module 20 includes:

[0112] Internal power supply 21; or,

[0113] The power interface circuit 22 is connected at one end to the drive circuit 30 and at the other end to an external power source.

[0114] Specifically, such as Figure 2 As shown, the power module 20 includes a power interface circuit 22. An external power source located outside the power supply circuit 100 can be connected to the drive circuit 30 through the power interface circuit 22 and output working power to the drive circuit 30. In one embodiment, the external power source and the energy storage component 300 are the same module.

[0115] Or, such as Figure 3 As shown, the power module 20 includes an internal power supply 21, which is installed in the power supply circuit 100 and can be used for the storage and output of electrical energy.

[0116] As one embodiment, the power module 20 further includes an isolation circuit, one end of which is connected to the internal power supply 21 or the power interface circuit 22, and the other end is connected to the drive circuit 30. Specifically, the internal power supply 21 or the external power supply connected to the power interface circuit 22 is configured to provide isolated power to the drive circuit through the isolation circuit.

[0117] It should be understood that setting up an isolation circuit can completely isolate the power supply (internal power supply 21 or external power supply) from the circuit structure of the rest of the power supply circuit, ensuring the safety of the power supply circuit system.

[0118] like Figures 1 to 6 As shown, a second aspect embodiment of this application also provides a power supply circuit 100, including:

[0119] The switching circuit 10 has a first interface terminal 11 for connecting to the energy storage component 300 and a second interface terminal 12 for connecting to the load. The switching circuit 10 has a switchable off state and an on state. In the on state, the first interface terminal 11 and the second interface terminal 12 are connected.

[0120] Power module 20 is used to provide operating power;

[0121] The drive circuit 30 is connected to the switch circuit 10 and the power module 20. The drive circuit 30 can output a first drive signal to the switch circuit 10 to indicate that the switch circuit 10 switches to the on state. The first drive signal is obtained by conversion from the working power supply.

[0122] The protection circuit 40 is connected to the drive circuit 30 and is used to output a protection signal to the drive circuit 30 when the signal voltage of the first drive signal is less than the target voltage, so as to indicate that the drive circuit 30 does not output the first drive signal.

[0123] Specifically, the drive circuit 30 is connected to the switch circuit 10 and the power module 20, and the drive circuit 30 can output a first drive signal to the switch circuit 10 to indicate that the switch circuit 10 switches to the on state. The first drive signal is obtained by converting the operating power supply. As one embodiment, the drive circuit 30 can also output a second drive signal to the switch circuit 10 to indicate that the switch circuit 10 switches to the off state. It should be understood that even if the drive circuit 30 does not output the first drive signal to the switch circuit 10, it can still be considered that the drive circuit 30 is outputting the second drive signal to the switch circuit 10.

[0124] As one embodiment, the drive circuit 30 is used to convert the operating power supply into a first drive signal. As another embodiment, the first drive signal may also be obtained by converting the operating power supply through other circuits in the power supply circuit 100.

[0125] As one embodiment, when the switching circuit 10 includes a switching unit, the driving circuit 30 is connected to the controlled terminal of the switching unit and is used to output a first driving signal and a second driving signal to the controlled terminal to switch the switching unit on and off.

[0126] The protection circuit 40 is connected to the drive circuit 30 and is used to output a protection signal to the drive circuit 30 when the signal voltage of the first drive signal is less than the target voltage, so as to indicate that the drive circuit 30 does not output the first drive signal.

[0127] In some implementations, during operation, the drive circuit 30 may also output a third drive signal to the power supply switch signal to indicate that the switch circuit 10 switches to the off state.

[0128] Specifically, in operation, the drive circuit 30 can output either a first drive signal or a third drive signal to the power supply switch signal based on user input, to indicate the on / off state of the switch circuit 10. It should be understood that even if the drive circuit 30 does not output the first drive signal to the switch circuit 10, it can still be considered as the drive circuit 30 outputting the third drive signal to the switch circuit 10.

[0129] As one embodiment, the second driving signal and the third driving signal can be the same signal output by the driving circuit 30, both used to indicate that the switching circuit 10 switches to the off state. For example, the second driving signal and the third driving signal can both be low-level signals.

[0130] It should be noted that since the first drive signal is obtained by converting the operating power supply, the signal voltage of the first drive signal matches the power supply voltage. Specifically, when the power supply voltage decreases, the signal voltage of the first drive signal will decrease accordingly. Furthermore, when the signal voltage of the first drive signal is less than the target voltage, the voltage value of the first drive signal will be insufficient to turn on the switching circuit 10.

[0131] It should also be noted that the signal voltage of the first drive signal can be detected by the protection circuit 40, the controller 500 in the power supply circuit 100, or the sampling / detection circuit additionally provided in the power supply circuit 100.

[0132] The power supply circuit 100 typically includes an electronically controlled switching unit. This switching unit is controlled to turn on by a first driving signal output from the drive circuit 30. However, when the power supply voltage provided by the power module 20 is insufficient, the signal voltage of the first driving signal will also be low. Forcibly turning on the switching unit using the first driving signal at this time will cause a malfunction in the power supply circuit 100. These malfunctions may damage the emergency equipment 200 or even cause a fire, hindering and endangering the user's operation. Additionally, the power module 20 can be an internal power supply 21 or a power interface circuit 22 for connecting to an external power supply. Insufficient power or low temperature of the aforementioned power supply may lead to insufficient power supply voltage provided by the power module 20, resulting in the signal voltage of the first driving signal being lower than the target voltage.

[0133] For example, the switching unit includes a MOSFET, and the driving circuit 30 is connected to the gate of the MOSFET to control the switching between the source and drain of the MOSFET. When the voltage strength of the first driving signal input to the gate is too low, the voltage between the gate and source of the MOSFET is insufficient, and the MOSFET may explode.

[0134] Based on this, in the power supply circuit 100 provided in the embodiments of this application, when the voltage of the working power supply provided by the power module 20 is insufficient, the protection circuit 40 outputs a protection signal to the drive circuit 30 to instruct the drive circuit 30 not to output the first drive signal and the switch circuit 10 to remain closed, thereby avoiding the switch circuit 10 from being forcibly turned on by the first drive signal when the voltage of the first drive signal is insufficient, which would cause the switch circuit 10 to malfunction and improve the power supply safety of the power supply circuit 100.

[0135] Furthermore, in the second aspect embodiment, the specific implementation methods of the remaining modules in the switching circuit 10, power module 20, drive circuit 30, protection circuit 40 and power supply circuit 100 can be referred to the specific description in the first aspect embodiment, and will not be repeated here.

[0136] Please see Figure 7 The third aspect of this application also provides an emergency device 200, including a housing 400, an energy storage component 300, and a power supply circuit 100 as provided in any embodiment of this application, wherein at least part of the energy storage component 300 and the power supply circuit 100 are structurally disposed within the housing 400.

[0137] In summary, this application provides a power supply circuit 100 and an emergency device 200. One power supply circuit 100 includes: a switching circuit 10 having a first interface terminal 11 for connecting to an energy storage component 300 and a second interface terminal 12 for connecting to a load; the switching circuit 10 has a switchable off state and an on state; in the on state, the first interface terminal 11 and the second interface terminal 12 are connected; a power module 20 for providing operating power; and a drive circuit 30 connected to the switching circuit 10 and the power module 20, the drive circuit 30 having a switchable operating state. In the power supply circuit 100 provided in this application embodiment, the switching circuit 10 can switch to an off state or an on state based on the driving signal output by the driving circuit 30. When the voltage of the working power supply provided by the power module 20 is insufficient, the protection circuit 40 outputs a first driving signal to the switching circuit 10 to indicate that the switching circuit 10 switches to a conducting state. The first driving signal is obtained by converting the working power supply. A protection circuit 40, connected to the driving circuit 30, outputs a protection signal to the driving circuit 30 when the voltage of the first driving signal is less than the target voltage, indicating that the driving circuit 30 switches to a standby state. In the standby state, the driving circuit 30 outputs a second driving signal to the switching circuit 10 to indicate that the switching circuit 10 switches to an off state. In the working state, the switching circuit 10 can switch to an off state or an on state based on the driving signal output by the driving circuit 30. When the voltage of the working power supply provided by the power module 20 is insufficient, the protection circuit 40 outputs a protection signal to the driving circuit 30 to indicate that the driving circuit 30 switches to a standby state. This ensures that the driving circuit 30 continues to output the second driving signal, and the switching circuit 10 remains off, preventing the switching circuit 10 from malfunctioning due to forcibly using the first driving signal to conduct when the voltage of the first driving signal is insufficient.

[0138] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0139] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0140] It should also be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0141] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply circuit, characterized in that, include: A switching circuit has a first interface terminal for connecting an energy storage component and a second interface terminal for connecting a load, and the switching circuit has a switchable off state and an on state, wherein in the on state, the first interface terminal and the second interface terminal are connected. The power module is used to provide operating power. A driving circuit is connected to the switching circuit and the power module. The driving circuit has a switchable working state and a standby state. In the working state, the driving circuit can output a first driving signal to the switching circuit to indicate that the switching circuit switches to the conducting state. The first driving signal is obtained by the working power supply. A protection circuit, connected to the drive circuit, is used to output a protection signal to the drive circuit when the signal voltage of the first drive signal is less than the target voltage, so as to indicate that the drive circuit switches to the standby state. In the standby state, the drive circuit outputs a second drive signal to the switch circuit to indicate that the switch circuit switches to the off state.

2. A power supply circuit, characterized in that, include: A switching circuit has a first interface terminal for connecting an energy storage component and a second interface terminal for connecting a load, and the switching circuit has a switchable off state and an on state, wherein in the on state, the first interface terminal and the second interface terminal are connected. The power module is used to provide operating power. A driving circuit is connected to the switching circuit and the power module. The driving circuit can output a first driving signal to the switching circuit to indicate that the switching circuit switches to the on state. The first driving signal is obtained by the working power supply. A protection circuit, connected to the drive circuit, is used to output a protection signal to the drive circuit when the signal voltage of the first drive signal is less than the target voltage, so as to instruct the drive circuit not to output the first drive signal.

3. The power supply circuit as described in any one of claims 1 or 2, characterized in that, The driving circuit includes: A voltage conversion circuit is provided, wherein the input terminal of the voltage conversion circuit is connected to the power supply module, and the output terminal of the voltage conversion circuit is connected to the switching circuit. The voltage conversion circuit is used to perform voltage conversion processing on the working power supply to obtain the first driving signal, and output the first driving signal from the output terminal of the voltage conversion circuit to the switching circuit. A grounding switch circuit, wherein the first terminal of the grounding switch circuit is connected to the output terminal of the voltage conversion circuit, and the second terminal of the grounding switch circuit is grounded; A trigger circuit is connected to the grounding switch circuit and is used to output a switching signal to the grounding switch circuit in response to an input trigger signal. The switching signal is used to indicate to the grounding switch circuit to switch the connection between the first terminal and the second terminal. When the protection circuit outputs the protection signal, the first and second terminals of the grounding switch circuit are connected and do not respond to the switching signal.

4. The power supply circuit as described in claim 3, characterized in that, The protection circuit includes: A Zener diode, the cathode of which is connected to the output terminal of the voltage conversion circuit; The first switching transistor has its first terminal connected to the output terminal of the voltage conversion circuit, its second terminal grounded, and its controlled terminal connected to the anode of the Zener diode. The second switch has its first terminal connected to the controlled terminal of the grounding switch circuit, its second terminal grounded, and its controlled terminal connected to its first terminal.

5. The power supply circuit as described in claim 4, characterized in that, The protection circuit also includes a protection resistor, through which the anode of the Zener diode is grounded.

6. The power supply circuit as described in claim 3, characterized in that, The grounding switch circuit includes a third switching transistor, a first voltage divider resistor, and a second voltage divider resistor; The first terminal of the third switching transistor is connected to the switching circuit and to the output terminal of the voltage conversion circuit through the first voltage divider resistor. The second terminal of the third switching transistor is grounded. The controlled terminal of the third switching transistor is connected to the trigger circuit and to the output terminal of the voltage conversion circuit through the second voltage divider resistor.

7. The power supply circuit as described in claim 6, characterized in that, The third switch is a P-channel MOSFET.

8. The power supply circuit as described in claim 3, characterized in that, The driving circuit also includes a voltage regulator circuit, which is connected between the power supply module and the input terminal of the voltage conversion circuit. The voltage regulator circuit is used to regulate the working power supplied by the power supply module and input it to the voltage conversion circuit.

9. The power supply circuit as described in any one of claims 1 or 2, characterized in that, The power module includes: Internal power supply; or, A power interface circuit, one end of which is connected to the drive circuit, and the other end of which is used to connect to an external power source.

10. The power supply circuit as described in any one of claims 1 or 2, characterized in that, In the operating state, the drive circuit can also output a third drive signal to the power supply switch signal to indicate that the switch circuit switches to the off state.

11. The power supply circuit as described in any one of claims 1 or 2, characterized in that, In the off state, the first interface terminal and the second interface terminal of the switching circuit are turned off.

12. An emergency device, characterized in that, The emergency equipment includes a housing, an energy storage component, and a power supply circuit as described in any one of claims 1-11, wherein at least a portion of the energy storage component and the power supply circuit are disposed within the housing.

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