Power supply circuit and emergency device

Abstract

This application provides a power supply circuit and emergency equipment. The power supply circuit includes: a power supply switch circuit for connecting an energy storage component and a load to form a power supply loop; a sampling circuit for sampling the electrical signal strength on the power supply loop; and a latching circuit connected to the sampling circuit and having a latching state and an unlocking state. The latching circuit is configured to enter the latching state and output a first shutdown signal to the power supply switch circuit when the electrical signal strength exceeds a first strength threshold until it switches back to the unlocking state. The power supply switch circuit is also used to shut down the power supply loop between the energy storage component and the load in response to the first shutdown signal. By causing the latching circuit to enter the latching state to maintain the output of the first shutdown signal to the power supply switch circuit when an overcurrent occurs in the power supply loop between the energy storage component and the load, overcurrent protection can be achieved by quickly and stably shutting down the power supply switch circuit, thus avoiding damage to the power supply circuit or load due to overcurrent and improving the power supply safety and stability of the power supply circuit.

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] To prevent overcurrent when supplying power to a vehicle, emergency equipment typically includes a microcontroller. The sampled current information is input into the microcontroller, which determines whether an overcurrent has occurred. If an overcurrent occurs, the microcontroller disconnects the emergency equipment from the vehicle's battery.

[0004] However, since the judgment and control operations of the microcontroller require a certain response time, and the timing of each operation is inconsistent, the current value of the overcurrent protection is inconsistent, and the protection speed is not fast enough. Summary of the Invention

[0005] The main purpose of this application is to provide a power supply circuit and emergency equipment, which can quickly and stably shut off the power supply circuit to provide overcurrent protection when an overcurrent is detected in the power supply circuit between the energy storage component and the load, so as to avoid accidental activation of the power supply circuit by the user and the resulting safety hazard.

[0006] In a first aspect, this application provides a power supply circuit, the power supply circuit comprising:

[0007] A power supply switching circuit is used to connect the energy storage component and the load to form a power supply loop between the energy storage component and the load.

[0008] A sampling circuit is used to sample the electrical signal strength on the power supply circuit.

[0009] A latching circuit is connected to a sampling circuit. The latching circuit has a latching state and an unlocking state. The latching circuit is configured to enter the latching state and output a first turn-off signal to the power supply switch circuit when the electrical signal strength exceeds a first strength threshold, until the latching circuit switches the latching state to the unlocking state.

[0010] The power supply switch circuit is also used to shut off the power supply circuit between the energy storage component and the load in response to the first shutdown signal.

[0011] In some implementations, the power supply switching circuit includes:

[0012] A switching circuit, one end of which is used to connect to the energy storage component and the other end of which is used to connect to the load, has a switchable on state and off state, and the switching circuit forms a power supply loop between the energy storage component and the load when it is on.

[0013] The first control circuit, connected to the latching circuit and the switching circuit, is at least used to control the switching circuit to switch to the off state in response to the first off signal, so as to shut off the power supply circuit.

[0014] In some embodiments, the latching circuit is also used to respond to a preset operation in the unlocked state to output a first conduction signal to the power supply switching circuit so that the power supply switching circuit responds to the first conduction signal to conduct the power supply circuit.

[0015] In some embodiments, the power supply circuit further includes a second control circuit, which is connected to the sampling circuit, the power supply switching circuit, and the latching circuit, and is used for:

[0016] When the electrical signal strength on the power supply circuit exceeds the first strength threshold, a second shutdown signal is output to the power supply switch circuit so that the power supply switch circuit shuts off the power supply circuit in response to the second shutdown signal.

[0017] At a preset time point after the second shutdown signal is output, a reset signal is output to the latch circuit. The reset signal is used to instruct the latch circuit to switch the latch state to the unlock state.

[0018] In some implementations, the second control circuit includes a microcontroller unit connected to the sampling circuit, the power supply switching circuit, and the latching circuit.

[0019] In some implementations, the latch circuit includes a latch unit having a set input, a reset input, and a signal output, wherein a sampling circuit is connected to the set input, a second control circuit is connected to the reset input, and a first control circuit is connected to the signal output.

[0020] The latch unit is used to continuously output a first shutdown signal to the first control circuit when the electrical signal strength exceeds a first strength threshold, and to stop outputting the first shutdown signal when a reset signal is received from the reset input terminal from the second control circuit.

[0021] In some implementations, the second control circuit is also used to output a second conduction signal to the power supply switch circuit to enable the power supply switch circuit to conduct the power supply circuit when the electrical signal strength does not exceed the first strength threshold.

[0022] In some implementations, the second control circuit is used to output a reset signal to the latch circuit after a first duration has elapsed from the time node at which the second shutdown signal is first output.

[0023] In some implementations, the first duration is 60 seconds.

[0024] In some implementations, the second control circuit is used to output a reset signal to the latch circuit at a first time point after the electrical signal strength drops to a second strength threshold.

[0025] In some implementations, the latching circuit is also used to switch from the unlocked state to the latched state at a second time point after the electrical signal strength drops to a third strength threshold.

[0026] Among them, the third intensity threshold is less than or equal to the first intensity threshold.

[0027] In some embodiments, the power supply circuit further includes a preprocessing circuit connected between the sampling circuit and the latching circuit. The preprocessing circuit is used to preprocess the electrical signal strength sampled by the sampling circuit to convert it into a detection signal, and transmit the detection signal to the latching circuit. The latching circuit is used to determine the electrical signal strength on the power supply circuit based on the signal strength of the detection signal.

[0028] In some implementations, the preprocessing circuit includes:

[0029] An amplifier circuit, connected to a sampling circuit, is used to amplify the electrical signal sampled by the sampling circuit to generate an amplified signal;

[0030] The comparator circuit has a positive input terminal, a negative input terminal, and a comparator output terminal. The positive input terminal is used to receive a preset reference voltage, the negative input terminal is connected to the amplifier circuit to receive the amplified signal, and the comparator output terminal is connected to the latch circuit.

[0031] In some implementations, the load includes a vehicle battery. When the power supply switching circuit is turned on to form a power supply loop between the energy storage component and the vehicle battery, the energy storage component supplies power to the load through the power supply switching circuit to start the vehicle.

[0032] Secondly, this application also provides an emergency device, which includes a housing, an energy storage component, and any of the power supply circuits provided in the embodiments of this application, wherein at least a portion of the energy storage component and the power supply circuit are disposed within the housing.

[0033] This application provides a power supply circuit and an emergency device. The power supply circuit includes: a power supply switch circuit for connecting an energy storage component and a load to form a power supply loop between the energy storage component and the load; a sampling circuit for sampling the electrical signal strength on the power supply loop; and a latching circuit connected to the sampling circuit. The latching circuit has a latching state and an unlocking state, and is configured to enter the latching state and output a first shutdown signal to the power supply switch circuit when the electrical signal strength exceeds a first strength threshold, until the latching circuit switches the latching state to the unlocking state. The power supply switch circuit is also used to shut off the power supply loop between the energy storage component and the load in response to the first shutdown signal. The power supply circuit and emergency equipment provided in this application embodiment establish a power supply loop between the energy storage component and the load through a power supply switch circuit. When an overcurrent is detected in the power supply loop between the energy storage component and the load, the latching circuit enters a latching state to maintain the output of the first shutdown signal to the power supply switch circuit. This can quickly and stably shut down the power supply switch circuit for overcurrent protection, avoiding permanent damage or even fire to the power supply circuit or load due to overcurrent in the power supply loop. This improves the safety and stability of the power supply circuit and prevents the power supply loop from being accidentally turned on again by the user, thus avoiding potential safety hazards. Attached Figure Description

[0034] 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.

[0035] Figure 1 A schematic diagram of a module of one embodiment of the power supply circuit provided in this application;

[0036] Figure 2 A schematic diagram of the circuit structure of one embodiment of the power supply circuit provided in this application;

[0037] Figure 3 A schematic diagram of the circuit structure of the latch circuit in one embodiment of the power supply circuit provided in this application;

[0038] Figure 4 A schematic diagram of the circuit structure of another embodiment of the power supply circuit provided in this application;

[0039] Figure 5 A schematic diagram of the circuit structure of another embodiment of the power supply circuit provided in this application.

[0040] Figure 6 A schematic diagram of a module for one embodiment of the emergency equipment provided in this application;

[0041] Explanation of reference numerals in the attached figures:

[0042] 100. Power supply circuit; 200. Energy storage component; 300. Load; 400. Housing; 500. Emergency equipment; 10. Power supply switch circuit; 11. First control circuit; 12. Switch circuit; 121. First connection circuit; 122. Second connection circuit; 123. Switch assembly; 20. Sampling circuit; 30. Latch circuit; 31. Latch unit; 40. Second control circuit; 41. Microcontroller unit; 50. Preprocessing circuit; 51. Amplification circuit; 52. Comparison circuit; Q1. Switching transistor. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] To prevent overcurrent when supplying power to a vehicle, emergency equipment typically includes a microcontroller. The sampled current information is input into the microcontroller, which determines whether an overcurrent has occurred. If an overcurrent occurs, the microcontroller disconnects the emergency equipment from the vehicle's battery.

[0048] However, since the judgment and control operations of the microcontroller require a certain response time, and the timing of each operation is inconsistent, the current value of the overcurrent protection is inaccurate, and the protection speed is not fast enough. Therefore, this application provides a power supply circuit and emergency equipment.

[0049] Please refer to Figures 1 to 2 , Figure 1This is a schematic diagram of a module of one embodiment of the power supply circuit provided in this application. Figure 2 This is a schematic diagram of the circuit structure of one embodiment of the power supply circuit provided in this application.

[0050] like Figure 1 and Figure 2 As shown, the power supply circuit 100 includes: a power supply switch circuit 10, a sampling circuit 20, and a latch circuit 30. The following is a detailed description of each module in the power supply circuit 100.

[0051] Specifically, the first end of the power supply switch circuit 10 is used to connect the energy storage component 200, and the second end of the power supply switch circuit 10 is used to connect the load 300, so that a power supply circuit is formed between the energy storage component 200 and the load 300 through the power supply switch circuit 10. The power supply switch circuit 10 has a switchable on state and an off state. In the on state, the energy storage component 200 can supply power to the load 300 through the power supply circuit. In the off state, the power supply circuit is interrupted, and the energy storage component 200 cannot supply power to the load 300.

[0052] In some embodiments, the load 300 includes a vehicle battery. When the power supply switching circuit 10 is turned on to form a power supply loop between the energy storage component 200 and the vehicle battery, the energy storage component 200 supplies power to the load 300 through the power supply switching circuit 10 to start the vehicle.

[0053] For example, the energy storage component 200 is an emergency power source, and the load 300 is a car battery. In a scenario where the car engine urgently needs to be started but the car battery has insufficient power, the car cannot be started normally. At this time, the car battery can be connected to the emergency power source through the power supply circuit 100, so that the energy storage component 200 supplies power to the car battery through the power supply switch circuit 10 in the power supply circuit 100, thereby providing power support for the emergency start-up of the car.

[0054] It should be noted that the power supply circuit 100 provided in this application embodiment may also include an energy storage component 200 and a load 300, but this application embodiment mainly focuses on the power supply circuit 100 without the energy storage component 200 and the load 300.

[0055] Specifically, the sampling circuit 20 is used to sample the electrical signal strength on the power supply circuit.

[0056] For example, the electrical signal strength on the power supply circuit can be either current strength or voltage strength, such as in... Figure 2 In the power supply circuit 100 shown, the sampling circuit 20 samples the current intensity between the negative terminal of the energy storage component 200 and the negative terminal of the load 300, for example, in... Figure 2The sampling circuit 20 shown can obtain the corresponding current intensity by sampling the current intensity of a short section of wire between the negative terminal of the energy storage component 200 and the negative terminal of the load 300.

[0057] Specifically, the latch circuit 30 is connected to the sampling circuit 20. The latch circuit 30 has a latch state and an unlock state. In the latch state, the latch circuit 30 will maintain its output signal until the latch circuit 30 switches to the unlock state.

[0058] The latching circuit 30 is configured to enter a latching state and output a first shutdown signal to the power supply switch circuit 10 when the electrical signal strength exceeds a first strength threshold, until the latching circuit 30 switches the latching state to the unlocking state. It should be noted that when the latching circuit 30 switches the latching state to the unlocking state, the latching circuit 30 stops outputting the first shutdown signal to the power supply switch circuit 10.

[0059] The power supply switching circuit 10 is also used to shut off the power supply circuit between the energy storage component 200 and the load 300 in response to the first shutdown signal. Based on this, when the electrical signal strength sampled by the sampling circuit 20 exceeds the first strength threshold, the power supply circuit between the energy storage component 200 and the load 300 remains closed until the latching circuit 30 switches from the latching state to the unlocking state.

[0060] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the circuit structure of the latch circuit in one embodiment of the power supply circuit provided in this application.

[0061] like Figure 3 As shown, the latch circuit 30 further includes a latch unit 31, which is, for example, an SR latch. The following is a detailed description of the SR latch as the latch circuit 30:

[0062] The SR latch consists of two NAND gates, and the output of each NAND gate is connected to one of the inputs of the other NAND gate. The S terminal of the SR latch is connected to the sampling circuit 20. When the S terminal receives the first turn-off signal, it can quickly enter the latching state and output the first turn-off signal to the power supply switch circuit 10, thereby responding to overcurrent protection more quickly. This avoids the problem of deviation in the overcurrent protection current value caused by the different detection and judgment time of the microcontroller in the existing microcontroller-based solution.

[0063] The power supply circuit 100 and emergency equipment 500 provided in this application embodiment establish a power supply loop between the energy storage component 200 and the load 300 through the power supply switch circuit 10. When an overcurrent is detected in the power supply loop between the energy storage component 200 and the load 300, the latch circuit 30 enters a latching state to maintain the output of the first shutdown signal to the power supply switch circuit 10. This can quickly and stably shut down the power supply switch circuit 10 for overcurrent protection, avoiding permanent damage or even fire to the power supply circuit 100 or the load 300 due to overcurrent in the power supply loop. This improves the safety and stability of the power supply circuit 100 in supplying power and avoids the safety hazard caused by accidental contact by the user that could lead to the power supply loop being reconnected.

[0064] like Figure 2 As shown, in some embodiments, the power supply switching circuit 10 includes:

[0065] The switching circuit 12 has one end for connecting the energy storage component 200 and the other end for connecting the load 300, and has a switchable on state and off state. In the on state, the switching circuit 12 forms a power supply loop between the energy storage component 200 and the load 300.

[0066] The first control circuit 11 is connected to the latch circuit 30 and the switch circuit 12, and is used at least to control the switch circuit 12 to switch to the off state in response to the first off signal, so as to shut off the power supply circuit.

[0067] Specifically, the first control circuit 11 is used to control the switch circuit 12 to switch to the off state when it receives the first off signal output by the latch circuit 30. For example, the switch circuit 12 is provided with a switch component 123, and the first control circuit 11 is connected to the switch component 123 to control the opening and closing of the switch component 123.

[0068] More specifically, in one embodiment, the energy storage component 200 has a positive terminal and a negative terminal, and the load 300 also has a positive terminal and a negative terminal. The switching circuit 12 includes a first connection circuit 121, a second connection circuit 122, and a switching component 123. The first end of the first connection circuit 121 is used to connect to the positive terminal B1 of the energy storage component 200, and the second end of the first connection circuit 121 is used to connect to the positive terminal P1 of the load 300. The first end of the second connection circuit 122 is used to connect to the negative terminal B2 of the energy storage component 200, and the second end of the second connection circuit 122 is used to connect to the negative terminal P2 of the load 300. The switching component 123 is disposed on the first connection circuit 121. When the power supply switching circuit 10 is in the on state, the switching component 123 connects the positive terminal B1 of the energy storage component 200 to the positive terminal P1 of the load 300. When the power supply switching circuit 10 is in the off state, the switching component 123 disconnects the connection between the positive terminal B1 of the energy storage component 200 and the positive terminal P1 of the load 300.

[0069] The switching assembly 123 will be described in detail below. The switching assembly 123 includes at least one switching transistor Q1. For example, the following description will use the example of the switching assembly 123 including the switching transistor Q1, where the switching transistor Q1 is a MOSFET:

[0070] The source and drain of the MOSFET are connected to the positive terminal B1 of the energy storage component 200 and the positive terminal P1 of the load 300, respectively. The gate of the MOSFET is connected to the output terminal of the first control circuit 11. The first control circuit 11 controls the switching circuit 12 to switch to the on state by outputting a conduction control signal to the gate of the switching transistor Q1, so that the switching transistor Q1 is turned on. Conversely, the first control circuit 11 controls the switching circuit 12 to switch to the off state by outputting a turn-off control signal to the gate of the switching transistor Q1, so that the switching transistor Q1 is turned off. The conduction control signal and the turn-off control signal are respectively a high-level signal and a low-level signal, depending on the type of MOSFET.

[0071] It should be noted that the above embodiments are only used to illustrate that the first control circuit 11 controls the power supply circuit to be turned on and off through a switching transistor Q1, and are not intended to limit the switching assembly 123.

[0072] The switching assembly 123 may also include multiple sub-switches Q1 connected in parallel between the positive terminal B1 of the energy storage assembly 200 and the positive terminal P1 of the load 300, and the first control circuit 11 is connected to the gate of each sub-switches Q1 to simultaneously control the conduction and turn-off of each sub-switches Q1, thereby improving the power supply stability of the power supply switching circuit 10.

[0073] In some embodiments, the latching circuit 30 is also used to output a first conduction signal to the power supply switching circuit 10 in response to a preset operation in the unlocked state, so that the power supply switching circuit 10 conducts the power supply circuit in response to the first conduction signal.

[0074] Specifically, the preset operations include at least one of the following:

[0075] Received user input;

[0076] It receives command signals from other circuit components (such as the second control circuit 40) in the power supply circuit 100.

[0077] It should be understood that the user input operation or the second control circuit 40 controls the latch circuit 30 to output a first conduction signal to the power supply switch circuit 10, which can turn on the power supply switch circuit 10 so that the energy storage component 200 can start supplying power to the load 300, or restore power supply after the power supply switch circuit 10 is turned off due to overcurrent.

[0078] Please see Figure 4 , Figure 4A schematic diagram of the circuit structure of another embodiment of the power supply circuit provided in this application.

[0079] like Figure 4 As shown, in some embodiments, the power supply circuit 100 further includes a second control circuit 40, which is connected to the sampling circuit 20, the power supply switch circuit 10, and the latch circuit 30, and is used for:

[0080] When the electrical signal strength on the power supply circuit exceeds the first strength threshold, a second shutdown signal is output to the power supply switch circuit 10 so that the power supply switch circuit 10 shuts off the power supply circuit in response to the second shutdown signal.

[0081] At a preset time point after the second shutdown signal is output, a reset signal is output to the latch circuit 30. The reset signal is used to instruct the latch circuit 30 to switch the latch state to the unlock state.

[0082] Specifically, when the electrical signal strength on the power supply circuit exceeds the first strength threshold, the first shutdown signal output by the latch circuit 30 to the power supply switch circuit 10 and the second shutdown signal output by the second control circuit 40 to the power supply switch circuit 10 are both used to instruct the power supply switch circuit 10 to shut down the power supply circuit. At a preset time node after the second control circuit 40 outputs the second shutdown signal, the second control circuit 40 outputs a reset signal to the latch circuit 30 to switch the latch circuit 30 to the unlocked state. At this time, the latch circuit 30 can respond to the preset operation and output a first conduction signal to the power supply switch circuit 10 to enable the power supply switch circuit 10 to conduct the power supply circuit in response to the first conduction signal.

[0083] In some embodiments, the second control circuit 40 includes a microcontroller unit 41 connected to the sampling circuit 20, the power supply switch circuit 10, and the latch circuit 30.

[0084] For example, the microcontroller unit 41 is a single-chip microcomputer. The latch circuit 30 includes a latch unit 31, which is, for example, an SR latch. The microcontroller unit 41 is connected to the R terminal of the SR latch to output a reset signal to the R terminal of the SR latch, so that the SR latch switches to the unlocked state.

[0085] Taking the latch circuit 30 as an SR latch and the second control circuit 40 as a microcontroller as an example, the microcontroller, including the microcontroller, requires a certain response time to judge the overcurrent and control the power supply switch circuit 10, which leads to a deviation in the current value of the overcurrent protection and the protection speed is not fast enough.

[0086] Based on this, when the electrical signal strength on the power supply circuit exceeds the first strength threshold (i.e., overcurrent occurs), the SR latch first quickly outputs a first shutdown signal to the power supply switch circuit 10 to shut down the power supply switch circuit 10. Then, the microcontroller outputs a second shutdown signal to the power supply switch circuit 10 to ensure that the power supply switch circuit 10 is shut down. Then, at a preset time node after the second control circuit 40 outputs the second shutdown signal, the second control circuit 40 resets the SR latch to the unlocked state, which allows the SR latch to respond to the preset operation and output a first conduction signal to the power supply switch circuit 10 to turn on the power supply circuit.

[0087] Therefore, by using the SR latch and the microcontroller together, the power supply switch circuit 10 can be controlled to turn on and off. It can quickly and stably turn off the power supply circuit for overcurrent protection, and can restore the power supply circuit to a conductive state after a period of time.

[0088] It should be understood that, in addition to the SR latch and the microcontroller, other latch units 31 or other microcontroller units 41 can achieve the same technical effect.

[0089] In some embodiments, the latch circuit 30 includes a latch unit 31, which has a set input terminal, a reset input terminal and a signal output terminal. The sampling circuit 20 is connected to the set input terminal, the second control circuit 40 is connected to the reset input terminal and the first control circuit 11 is connected to the signal output terminal.

[0090] The latch unit 31 is used to continuously output a first shutdown signal to the first control circuit 11 when the electrical signal strength exceeds a first strength threshold, and to stop outputting the first shutdown signal when a reset signal is received from the reset input terminal by the second control circuit 40.

[0091] Specifically, the latch unit 31 is configured to determine the electrical signal strength sampled by the sampling circuit 20 through the set input terminal, and output a first turn-off signal or a first turn-on signal to the first control circuit 11 through the signal output terminal. The second control circuit 40 is configured to output a reset signal to the reset input terminal of the latch unit 31.

[0092] Taking latch unit 31 as an example of an SR latch, the S terminal of the SR latch is connected to the sampling circuit 20, the R terminal of the SR latch is connected to the second control circuit 40, and the Q terminal of the SR latch is connected to the first control circuit 11.

[0093] In some embodiments, the second control circuit 40 is also used to output a second conduction signal to the power supply switch circuit 10 so that the power supply switch circuit 10 conducts the power supply circuit when the electrical signal strength does not exceed the first strength threshold.

[0094] Specifically, if the electrical signal strength does not exceed the first strength threshold, it indicates that the current in the power supply circuit between the energy storage component 200 and the load 300 is not overcurrent. At this time, the second control circuit 40 can output a second conduction signal to the power supply switch circuit 10 to indicate that the power supply switch circuit 10 conducts the power supply circuit, and the energy storage component 200 can normally supply power to the load 300.

[0095] It should be understood that, in addition to the first turn-on signal output by the latching circuit 30 to the switching circuit 12, the second turn-on signal output by the second control circuit 40 to the switching circuit 12 also indicates that the switching circuit 12 turns on the power supply circuit between the energy storage component 200 and the load 300.

[0096] In some implementations, the second control circuit 40 is used to output a reset signal to the latch circuit 30 after a first duration has elapsed from the time node at which the second shutdown signal is started to be output.

[0097] It should be understood that the reset control of the latch circuit 30 can be controlled by the second control circuit 40.

[0098] Specifically, after the first duration has elapsed since the second shutdown signal was output, the latch circuit 30 receives the reset signal output by the second control circuit 40 and resets to the unlocked state. At this time, the latch circuit 30 can respond to the preset operation and output the first turn-on signal to the power supply switch circuit 10 so that the power supply switch circuit 10 responds to the first turn-on signal to turn on the power supply circuit.

[0099] For example, the first duration is 60 seconds.

[0100] It should be understood that setting the latch circuit 30 to maintain the output of the first shutdown signal to the power supply switch circuit 10 in the latched state to indicate that the power supply switch circuit 10 is shut off is intended to avoid the safety hazard caused by the power supply circuit being turned on again due to user accidental touch, and to improve the protection effect. However, after the latch circuit 30 has been in the locked state for a certain period of time, the user should also be allowed to input the operation again so that the latch circuit 30 can control the power supply switch circuit 10 to resume conduction.

[0101] In some implementations, the second control circuit 40 is used to output a reset signal to the latch circuit 30 at a first time point after the electrical signal strength drops to a second strength threshold.

[0102] Specifically, when the electrical signal strength sampled by the sampling circuit 20 drops to the second strength threshold, it indicates that there is no overcurrent in the current power supply circuit. Therefore, at the corresponding first time node, the second control circuit 40 can output a reset signal to the latch circuit 30 to control the latch circuit 30 to switch to the unlocked state.

[0103] It should be understood that if the electrical signal strength sampled by the sampling circuit 20 exceeds the first strength threshold, it may be due to a circuit fault in the power supply circuit 100 or overheating caused by prolonged operation of some components or circuits in the power supply circuit 100, leading to overcurrent. In this case, the power supply circuit needs to be shut off to stop the overcurrent. Conversely, if the electrical signal strength drops to the second strength threshold, it may be because the circuit fault in the power supply circuit 100 has been resolved, or because the corresponding components or circuits have cooled down after the power supply circuit 100 was interrupted. In this case, the user should be allowed to input an operation again to allow the latching circuit 30 to control the power supply switch circuit 10 to resume conduction, thereby allowing the power supply circuit 100 to continue to be used.

[0104] In some implementations, the latching circuit 30 is also used to switch from the unlocked state to the latched state at a second time point after the electrical signal strength drops to the third strength threshold.

[0105] Among them, the third intensity threshold is less than or equal to the first intensity threshold.

[0106] Specifically, the reset control of the latch circuit 30 can also be actively controlled by the latch circuit 30. At the second time point after the latch circuit 30 confirms that the electrical signal strength has dropped to the third strength threshold, it actively switches from the unlocked state to the latched state.

[0107] The second time node can refer to the moment when the electrical signal strength drops to the third strength threshold, or it can refer to the moment when the electrical signal strength drops to the third strength threshold and then a preset time period has elapsed.

[0108] In some embodiments, the power supply circuit 100 further includes a preprocessing circuit 50 connected between the sampling circuit 20 and the latching circuit 30. The preprocessing circuit 50 is used to preprocess the electrical signal strength sampled by the sampling circuit 20 to convert it into a detection signal, and transmit the detection signal to the latching circuit 30. The latching circuit 30 is used to determine the electrical signal strength on the power supply circuit based on the signal strength of the detection signal.

[0109] Specifically, the latch circuit 30 includes a latch unit 31, the set input terminal of the latch unit 31 is connected to the preprocessing circuit 50, and the preprocessing circuit 50 is used to input the detection signal to the set input terminal so that the latch circuit 30 determines whether an overcurrent has occurred in the power supply circuit based on the signal strength of the detection signal.

[0110] In some embodiments, the preprocessing circuit 50 includes:

[0111] Amplifier circuit 51 is connected to sampling circuit 20 and is used to amplify the electrical signal sampled by sampling circuit 20 to generate an amplified signal.

[0112] The comparator circuit 52 has a positive input terminal, a negative input terminal, and a comparator output terminal. The positive input terminal is used to receive a preset reference voltage, the negative input terminal is connected to the amplifier circuit 51 to receive the amplified signal, and the comparator output terminal is connected to the latch circuit 30.

[0113] It should be understood that the electrical signal sampled by the sampling circuit 20 may have intensity fluctuations or low intensity, making it difficult to directly determine whether an overcurrent has occurred in the power supply circuit. Therefore, it is necessary to preprocess the electrical signal intensity sampled by the sampling circuit 20, which includes at least amplification and comparison processing.

[0114] The amplified signal is, for example, a voltage signal.

[0115] For example, the detection signal includes two types: a high-level signal and a low-level signal. When the reference voltage is greater than the amplified signal, the detection signal is a high-level signal, which confirms that an overcurrent phenomenon has occurred in the power supply circuit. When the reference voltage is not greater than the amplified signal, the detection signal is a low-level signal, which confirms that no overcurrent phenomenon has occurred in the power supply circuit.

[0116] Please see Figure 6 , Figure 6 This is a schematic diagram of a module of an embodiment of the emergency equipment 500 provided in this application.

[0117] like Figure 6 As shown, this application also provides an emergency device 500, which includes a housing 400, an energy storage component 200, and any of the power supply circuits 100 provided in the embodiments of this application. At least part of the energy storage component 200 and the power supply circuit 100 are structurally disposed within the housing 400.

[0118] Specifically, the emergency device 500 includes a vehicle emergency jump starter and / or battery clamps.

[0119] The emergency device 500 can supply power to loads 300, such as car batteries, to provide electrical support for the normal ignition and starting of loads 300.

[0120] The energy storage component 200 of the emergency equipment 500 is preferably located inside the housing 400, and the power supply circuit 100 of the emergency equipment 500 is also preferably located inside the housing 400. These can be configured according to actual conditions and are not limited here.

[0121] In summary, this application provides a power supply circuit 100 and an emergency device 500. The power supply circuit 100 includes: a power supply switch circuit 10 for connecting an energy storage component 200 and a load 300 to form a power supply loop between the energy storage component 200 and the load 300; a sampling circuit 20 for sampling the electrical signal strength on the power supply loop; and a latching circuit 30 connected to the sampling circuit 20. The latching circuit 30 has a latching state and an unlocking state, and is configured to enter the latching state and output a first shutdown signal to the power supply switch circuit 10 when the electrical signal strength exceeds a first strength threshold, until the latching circuit 30 switches the latching state to the unlocking state. The power supply switch circuit 10 is also used to shut off the power supply loop between the energy storage component 200 and the load 300 in response to the first shutdown signal. The power supply circuit 100 and emergency equipment 500 provided in this application embodiment establish a power supply loop between the energy storage component 200 and the load 300 through the power supply switch circuit 10. When an overcurrent is detected in the power supply loop between the energy storage component 200 and the load 300, the latch circuit 30 is latched to maintain the output of the first shutdown signal to the power supply switch circuit 10. This can quickly and stably shut down the power supply switch circuit 10 for overcurrent protection, avoiding permanent damage or even fire to the power supply circuit 100 or the load 300 due to overcurrent in the power supply loop. This improves the safety and stability of the power supply circuit 100 in supplying power and avoids the situation where the power supply loop is accidentally turned on again by the user, causing a safety hazard.

[0122] It should be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a," "an," and "the" are intended to include the plural forms. The terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0123] 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.

[0124] 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 equivalent modifications or substitutions that can be easily conceived should be included 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 power supply switching circuit is used to connect the energy storage component and the load to form a power supply loop between the energy storage component and the load. A sampling circuit is used to sample the electrical signal strength on the power supply circuit. A latching circuit is connected to the sampling circuit. The latching circuit has a latching state and an unlocking state. The latching circuit is configured to enter the latching state and output a first shutdown signal to the power supply switch circuit when the electrical signal strength exceeds a first strength threshold, until the latching circuit switches the latching state to the unlocking state. The power supply switch circuit is also used to shut off the power supply circuit between the energy storage component and the load in response to the first shutdown signal.

2. The power supply circuit as described in claim 1, characterized in that, The power supply switching circuit includes: A switching circuit, one end of which is used to connect to the energy storage component and the other end of which is used to connect to the load, and has a switchable on state and off state, and the switching circuit forms the power supply loop between the energy storage component and the load in the on state. A first control circuit, connected to the latching circuit and the switching circuit, is at least used to control the switching circuit to switch to the off state in response to the first shutdown signal, so as to shut down the power supply circuit.

3. The power supply circuit as described in claim 1, characterized in that, The latching circuit is also used to respond to a preset operation in the unlocked state and output a first conduction signal to the power supply switching circuit so that the power supply switching circuit conducts the power supply circuit in response to the first conduction signal.

4. The power supply circuit as described in claim 2, characterized in that, The power supply circuit further includes a second control circuit, which is connected to the sampling circuit, the power supply switching circuit, and the latching circuit, and is used for: When the electrical signal strength on the power supply circuit exceeds the first strength threshold, a second shutdown signal is output to the power supply switch circuit so that the power supply switch circuit shuts off the power supply circuit in response to the second shutdown signal. At a preset time point after the second shutdown signal is output, a reset signal is output to the latch circuit. The reset signal is used to instruct the latch circuit to switch the latch state to the unlock state.

5. The power supply circuit as described in claim 4, characterized in that, The second control circuit includes a microcontroller unit connected to the sampling circuit, the power supply switch circuit, and the latch circuit.

6. The power supply circuit as described in claim 4, characterized in that, The latch circuit includes a latch unit, which has a set input terminal, a reset input terminal and a signal output terminal. The sampling circuit is connected to the set input terminal, the second control circuit is connected to the reset input terminal, and the first control circuit is connected to the signal output terminal. The latch unit is configured to continuously output the first shutdown signal to the first control circuit when the electrical signal strength exceeds the first strength threshold, and to stop outputting the first shutdown signal when the reset signal output by the second control circuit is received from the reset input terminal.

7. The power supply circuit as described in claim 4, characterized in that, The second control circuit is further configured to output a second conduction signal to the power supply switch circuit to enable the power supply switch circuit to conduct the power supply circuit when the electrical signal strength does not exceed the first strength threshold.

8. The power supply circuit as described in claim 4, characterized in that, The second control circuit is used to output the reset signal to the latch circuit after a first time period has elapsed since the time node at which the second shutdown signal is first output.

9. The power supply circuit as described in claim 8, characterized in that, The first duration is 60 seconds.

10. The power supply circuit as described in claim 4, characterized in that, The second control circuit is used to output the reset signal to the latch circuit at a first time point after the electrical signal strength drops to the second strength threshold.

11. The power supply circuit according to any one of claims 1-10, characterized in that, The latching circuit is also used to switch from the unlocked state to the latched state at a second time node after the electrical signal strength drops to the third strength threshold. Wherein, the third intensity threshold is less than or equal to the first intensity threshold.

12. The power supply circuit as described in any one of claims 1-10, characterized in that, The power supply circuit further includes a preprocessing circuit connected between the sampling circuit and the latching circuit. The preprocessing circuit is used to preprocess the electrical signal strength sampled by the sampling circuit to convert it into a detection signal, and transmit the detection signal to the latching circuit. The latching circuit is used to determine the electrical signal strength on the power supply circuit based on the signal strength of the detection signal.

13. The power supply circuit as described in claim 12, characterized in that, The preprocessing circuit includes: An amplifier circuit is connected to the sampling circuit and is used to amplify the electrical signal sampled by the sampling circuit to generate an amplified signal. The comparator circuit has a positive input terminal, a negative input terminal, and a comparator output terminal. The positive input terminal is used to receive a preset reference voltage, the negative input terminal is connected to the amplifier circuit to receive the amplified signal, and the comparator output terminal is connected to the latch circuit.

14. The power supply circuit according to any one of claims 1-10, characterized in that, The load includes a car battery. When the power supply switch circuit is turned on to form a power supply loop between the energy storage component and the car battery, the energy storage component supplies power to the load through the power supply switch circuit to start the car.

15. 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 1-14, wherein at least a portion of the energy storage component and the power supply circuit are disposed within the housing.

Images