Short-circuit protection circuit and energy storage power supply

Abstract

The utility model relates to the technical field of energy storage power supplies, and mainly provides a short circuit protection circuit and an energy storage power supply, the circuit comprises a switch module, a protection module and a detection module; the switch module is connected with the detection module, the protection module and the battery, the detection module is connected with the protection module, and the switch module and the protection module are both used for receiving driving signals. The switch module is used for starting to work after receiving the driving signal so as to output the power supply voltage of the battery; the detection module is used for controlling the protection module to stop working when the output voltage of the switch module is greater than a preset voltage, so that the switch module continuously works according to the driving signal; and when the output voltage is smaller than the preset voltage, it is considered that a short-circuit fault occurs, and at the moment, the control protection module works based on the driving signal to enable the switch module to stop working, so that the situation that the energy storage power supply fails due to the fact that the battery is still in a working state during short circuit is avoided, and the service life of the energy storage power supply is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage power supply especially relates to a short circuit protection circuit and energy storage power supply.

BACKGROUND

[0002] In the energy storage system, the battery is often connected with the direct current power (DC) through the switching tube to realize the switching and collaborative work of multiple power supply modes and meet the power demand of the equipment under different working conditions.

[0003] However, when the device connected with the DC output occurs short circuit fault, the current in the circuit will increase sharply, and since there is electrical connection between the battery and the DC, the excessive short circuit current will generate a large pressure drop in the circuit, thereby causing the output voltage of the battery to be pulled down. When the input voltage of the battery is lower than the normal working voltage threshold of the switching tube, the switching tube may not be normally turned on or turned off, so that the voltage and current borne by the switching tube exceed its voltage stress and current stress, which easily causes damage to the switching tube. Once the switching tube is damaged, the power transmission path of the entire power supply system will be destroyed, thereby causing the energy storage system to malfunction and reducing the service life of the energy storage system.

UTILITARY MODEL CONTENT

[0004] The utility model embodiment provides a kind of short circuit protection circuit and energy storage power supply, to solve the technical problem that energy storage system in prior art is short-circuited, energy storage power supply is prone to malfunction, service life is low.

[0005] To solve the above technical problems, one technical scheme of the utility model embodiment is to provide a short circuit protection circuit, the short circuit protection circuit includes switching module, protection module and detection module;

[0006] The switching module is connected with the detection module and the protection module respectively, the detection module is connected with the protection module, and the switching module is also connected with the battery. The switching module and the protection module are also used to receive driving signals.

[0007] The switching module is used to start working according to the driving signal to output the power supply voltage of the battery after receiving the driving signal.

[0008] The detection module is used to detect the output voltage of the switching module, and when the output voltage is greater than the preset voltage, the protection module is controlled to stop working, so that the switching module continues to work according to the driving signal. And

[0009] When the output voltage is less than the preset voltage, the protection module is controlled to work based on the driving signal, so that the switch module is controlled to stop working based on the protection module, thereby stopping outputting the power supply voltage.

[0010] Optionally, the detection module comprises a detection unit and a first control unit.

[0011] The detection unit is connected with the switch module and the first control unit respectively, and the first control unit is connected with the protection module.

[0012] The detection unit is configured to detect the output voltage of the switch module, and output a first control signal to the first control unit when the output voltage is greater than a preset voltage, so that the first control unit controls the protection module to stop working according to the first control signal; and

[0013] When the output voltage is less than the preset voltage, a second control signal is output to the first control unit, so that the first control unit controls the protection module to start working according to the second control signal, thereby causing the switch module to be disconnected.

[0014] Optionally, the detection unit comprises a Zener diode ZD1.

[0015] The cathode of the Zener diode ZD1 is connected with the switch module, and the anode of the Zener diode ZD1 is connected with the first control unit.

[0016] Optionally, the first control unit comprises a resistor R7, a resistor R9 and a switch tube Q4.

[0017] The control end of the switch tube Q4 is connected with the detection unit through the resistor R7, the control end of the switch tube Q4 is also connected with the second end of the switch tube Q4 through the resistor R9, the first end of the switch tube Q4 is connected with the protection module, and the second end of the switch tube Q4 is configured to be grounded.

[0018] Optionally, the protection module comprises a switch tube Q3, a resistor R5 and a resistor R8.

[0019] The control end of the switch tube Q3 receives a driving signal through the resistor R5, the control end of the switch tube Q3 is also connected with the detection module, the control end of the switch tube Q3 is also connected with the second end of the switch tube Q3 through the resistor R8, the first end of the switch tube Q3 is connected with the switch module, and the second end of the switch tube Q3 is configured to be grounded.

[0020] Optionally, the protection module further comprises a capacitor C2.

[0021] The first end of the capacitor C2 is connected with the control end of the switch tube Q3, and the second end of the capacitor C2 is used for grounding;

[0022] The capacitor C2 is used for receiving the driving signal, so that the switch tube Q3 is delayed to be turned on.

[0023] Optionally, the switch module comprises a second control unit and a switch unit.

[0024] The second control unit is connected with the switch unit, the switch unit is connected with the detection module, and the second control unit is further used for receiving a driving signal.

[0025] The second control unit is used for receiving an off signal output by the protection module, and stops working based on the off signal, so as to control the switch unit to be disconnected.

[0026] When the off signal is not received, the switch unit is controlled to be connected based on the driving signal, so that the power supply voltage of the battery is output.

[0027] Optionally, the second control unit comprises a switch tube Q2, a resistor R4 and a resistor R6.

[0028] The control end of the switch tube Q2 receives a driving signal through the resistor R4, and the control end of the switch tube Q2 is further connected with the second end of the switch tube Q2 through the resistor R6, the first end of the switch tube Q2 is connected with the switch unit, and the second end of the switch tube Q2 is used for grounding.

[0029] Optionally, the switch unit comprises a switch tube Q1, a resistor R1 and a resistor R2.

[0030] The control end of the switch tube Q1 is connected with the second control unit through the resistor R2, the first end of the switch tube Q1 is connected with the battery, the first end of the switch tube Q1 is further connected with the control end of the switch tube Q1 through the resistor R1, and the second end of the switch tube Q1 is used for connecting the electric device.

[0031] To solve the above technical problems, another technical scheme adopted by the embodiment of the utility model is to provide a kind of energy storage power supply, and the energy storage power supply comprises:

[0032] Battery;And

[0033] The short-circuit protection circuit described above.

[0034] Different from the related art, the utility model provides a kind of short-circuit protection circuit and energy storage power supply, the short-circuit protection circuit includes switching module, protection module and detection module;The switching module is connected with the detection module and the protection module respectively, the detection module is connected with the protection module, the switching module is also connected with battery, the switching module and the protection module are also used to receive driving signal.The switching module is used to work according to the driving signal after receiving the driving signal, to export the power supply voltage of the battery to consumer equipment;The detection module is used to detect the output voltage of the switching module, and when the output voltage is greater than preset voltage, the protection module is controlled to stop working, so that the switching module continues to work according to the driving signal, so that the switching module continues to transmit the power supply voltage;And when the output voltage is less than the preset voltage, then consider that the consumer equipment is in short-circuit state, at this moment, the protection module is controlled to work based on the driving signal, to make the switching module stop working, to avoid the condition that the battery is still in working state when consumer equipment is short-circuited and leads to the failure of energy storage power supply, to further improve the service life of the energy storage power supply. BRIEF DESCRIPTION OF DRAWINGS

[0035] One or more embodiments are illustrated by way of example in the accompanying drawings that are not intended to be limiting of the embodiments, in which like references numbers refer to like elements, unless otherwise specified. The drawings are not necessarily to scale, the emphasis instead being placed upon illustrating the principles of the embodiments.

[0036] Figure 1 It is a schematic diagram of application scenario provided by the utility model embodiment;

[0037] Figure 2 It is the structure block diagram of short-circuit protection circuit provided by the utility model embodiment;

[0038] Figure 3 It is the circuit diagram of short-circuit protection circuit provided by the utility model embodiment. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is combined with drawing and embodiment, and the utility model is further detailed.It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0040] The technical features involved in the various embodiments of the present application described below do not constitute conflicts with each other and can be combined with each other.

[0041] When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can be present.

[0042] The terms "first", "second", and the like, in the description and in the claims of the utility model, are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more.

[0043] Unless otherwise defined, all technical and scientific terms used in the specification are the same as those commonly understood by those skilled in the art of the utility model. The terms used in the specification of the utility model are only for the purpose of describing the specific embodiments, not for limiting the utility model. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0044] Please refer to Figure 1 , Figure 1 is a schematic diagram of an application scenario provided by the utility model embodiment, as Figure 1 shown, the application scenario 1 includes an energy storage power supply 100, a direct current power supply 200 and a load 300, the energy storage power supply 100 is connected with the load 300 through the direct current power supply 200, the direct current power supply 200 is used to receive the power supply voltage output by the energy storage power supply 100 and converts and processes the power supply voltage to output preset direct current to the load 300, so that the load 300 works normally. It should be noted that when the energy storage power supply 100 supplies power to the load 300, the voltage output by the energy storage power supply 100 may be alternating current, and the working voltage of the load 300 is direct current. At this time, the alternating current is output to the direct current power supply 200, so that the alternating current is converted into direct current by the direct current power supply 200 and input to the load 300, so that the load 300 works normally.

[0045] In still another embodiment, when the energy storage power supply 100 outputs direct current, there may be a mismatch between the voltage output by the energy storage power supply 100 and the load 300. Therefore, during the process of the energy storage power supply 100 supplying power to the load 300, the energy storage power supply 100 inputs voltage to the direct current power supply 200 to adjust the direct current by the direct current power supply 200, so that the direct current input to the load 300 matches the working voltage.

[0046] In some embodiments, as shown in Figure 1 The energy storage power supply 100 further comprises a battery 10 connected with the direct current power supply 200, and the battery 10 is used to output voltage to the direct current power supply 200. However, when the direct current power supply 200 supplies power to the load 300 based on the voltage output by the battery 10, if the load 300 has a short circuit fault, the current of the direct current power supply 200 will increase sharply, so that the voltage of the battery 10 is pulled down, and the energy storage power supply 100 is damaged. Based on this, in order to protect the energy storage power supply 100, the energy storage power supply 100 further comprises a short circuit protection circuit 20 connected with the battery 10 and the direct current power supply 200, respectively, and the short circuit protection circuit 20 is used to detect the output voltage of the battery 10 in real time, so as to cut off the output of the battery 10 when the output voltage of the battery 10 is pulled down, thereby avoiding the situation that the energy storage power supply 100 is damaged due to the short circuit at the output end of the direct current power supply 200.

[0047] In another embodiment, as shown in Figure 1 The energy storage power supply 100 further comprises a controller 30 connected with the short circuit protection circuit 20, and the controller 30 is used to output a driving signal to the short circuit protection circuit 20 when the energy storage power supply 100 outputs voltage through the direct current power supply 200, so that the short circuit protection circuit 20 outputs the power supply voltage of the battery 10 to the direct current power supply 200 when the output end of the direct current power supply 200 is normal. When the output end of the direct current power supply 200 is short-circuited, the power supply voltage of the battery 10 is disconnected, thereby protecting the energy storage power supply 100.

[0048] In some embodiments, please refer to Figure 2 , Figure 2 The structure block diagram of the short circuit protection circuit provided by the embodiment of the utility model is shown in Figure 2 The short circuit protection circuit 20 comprises a switch module 21, a protection module 22 and a detection module 23.

[0049] The switch module 21 is connected with the detection module 23 and the protection module 22, respectively, the detection module 23 is connected with the protection module 22, and the switch module 21 is further connected with the battery 10. The switch module 21 and the protection module 22 are also used to receive driving signals.

[0050] The switch module 21 is used to start working according to the driving signal after receiving the driving signal, so as to output the power supply voltage of the battery 10.

[0051] The detection module 23 is configured to detect the output voltage of the switch module 21, and when the output voltage is greater than a preset voltage, control the protection module 22 to stop working, so that the switch module 21 continues to work according to the driving signal; and

[0052] When the output voltage is less than the preset voltage, control the protection module 22 to work based on the driving signal, so as to stop the switch module 21 from working based on the control of the protection module 22, thereby stopping outputting the power supply voltage.

[0053] Specifically, when the battery 10 outputs the voltage, the switch module 21 receives the driving signal output by the controller 30 and starts to work according to the driving signal, so as to output the power supply voltage of the battery 10 to the DC power supply 200. When the battery 10 outputs the power supply voltage through the switch module 21, the detection module 23 detects the power supply voltage output by the switch module 21 in real time, and judges whether the power supply voltage is greater than a preset voltage. If the power supply voltage is greater than the preset voltage, it is considered that the output end of the DC power supply 200 is normal. At this time, the detection module 23 controls the protection module 22 to stop working, so that the switch module 21 continues to be in the on state according to the driving signal, thereby making the energy storage power supply 100 continuously output the voltage to the DC power supply 200. If the power supply voltage is less than the preset voltage, it is considered that the output end of the DC power supply 200 has a short circuit fault. At this time, the detection module 23 controls the protection module 22 to start working according to the driving signal, so as to control the switch module 21 to stop working according to the protection module 22, thereby making the energy storage power supply 100 stop outputting, and further protecting the energy storage power supply 100. It should be noted that when the output end of the DC power supply 200 has a short circuit, the current of the DC power supply 200 will increase sharply, thereby making the voltage of the battery 10 be pulled down, and further causing the output voltage of the switch module 21 to be reduced. Based on this, whether a short circuit fault occurs can be judged by detecting the output voltage of the switch module 21, thereby achieving the purpose of protecting the energy storage power supply 100.

[0054] In some embodiments, as shown in Figure 2 The detection module 23 includes a detection unit 231 and a first control unit 232;

[0055] The detection unit 231 is connected with the switch module 21 and the first control unit 232 respectively, and the first control unit 232 is connected with the protection module 22;

[0056] The detection unit 231 is configured to detect the output voltage of the switch module 21, and output a first control signal to the first control unit 232 when the output voltage is greater than a preset voltage, so that the first control unit 232 controls the protection module 22 to stop working according to the first control signal; and

[0057] When the output voltage is less than the preset voltage, a second control signal is output to the first control unit 232, so that the first control unit 232 controls the protection module 22 to start working according to the second control signal, so that the switch module 21 is disconnected.

[0058] Specifically, when the switch module 21 starts working, the power supply voltage of the battery 10 is output to the DC power supply 200 through the switch module 21, at this time, the detection unit 231 detects the power supply voltage output by the switch module 21 in real time, and when the power supply voltage is greater than a preset voltage, a first control signal is output to the first control unit 232, so that the first control unit 232 starts working based on the first control signal, so that the protection module 22 stops working. When the power supply voltage is less than the preset voltage, a second control signal is output to the first control unit 232, so that the first control unit 232 stops working based on the second control signal, so that the protection module 22 starts working based on the driving signal.

[0059] In some embodiments, please refer to Figure 3 , Figure 3 is a circuit diagram of a short circuit protection circuit provided by the utility model embodiment, as Figure 3 shown, the detection unit 231 includes a voltage stabilizing tube ZD1;The first control unit 232 includes resistance R7, resistance R9 and switch tube Q4;

[0060] The cathode of the voltage stabilizing tube ZD1 is connected with the switch module 21, and the anode of the voltage stabilizing tube ZD1 is connected with the first control unit 232.

[0061] The control end of the switch tube Q4 is connected with the detection unit 231 through the resistance R7, and the control end of the switch tube Q4 is also connected with the second end of the switch tube Q4 through resistance R9, the first end of the switch tube Q4 is connected with the protection module 22, and the second end of the switch tube Q4 is used for grounding.

[0062] Specifically, when the switch module 21 outputs the power supply voltage to the direct current power supply 200, the power supply voltage also flows into the voltage stabilizing tube ZD1. At this time, if the power supply voltage is greater than the preset voltage, the voltage stabilizing tube ZD1 is broken down. After the voltage stabilizing tube ZD1 is broken down, the power supply voltage flows into the control end of the switch tube Q4 through the voltage stabilizing tube ZD1 and the resistor R7, so that the switch tube Q4 is turned on. After the switch tube Q4 is turned on, the protection module 22 stops working, so that the switch module 21 continuously stays in the on state based on the driving signal. If the power supply voltage is less than the preset voltage, the voltage stabilizing tube ZD1 is not broken down, so that the switch tube Q4 stays in the off state. After the switch tube Q4 is turned off, the protection module 22 starts working according to the driving signal, so that the switch module 21 stops working. The preset voltage is the voltage stabilizing value of the voltage stabilizing tube ZD1.

[0063] In some embodiments, as shown in FIG. 2, the protection module 22 includes a switch tube Q3, a resistor R5 and a resistor R8. Figure 3

[0064] The control end of the switch tube Q3 receives a driving signal (DC-EN) through the resistor R5. The control end of the switch tube Q3 is also connected with the detection module 23. The control end of the switch tube Q3 is also connected with the second end of the switch tube Q3 through the resistor R8. The first end of the switch tube Q3 is connected with the switch module 21. The second end of the switch tube Q3 is used for grounding.

[0065] Specifically, after the switch tube Q4 is turned on according to the first control signal, the voltage at the control end of the switch tube Q3 is pulled down, so that the switch tube Q3 stays in the off state. After the switch tube Q3 is turned off, the switch module 21 continuously stays in the on state according to the driving signal. After the switch tube Q4 is turned off according to the second control signal, the driving signal is input to the control end of the switch tube Q3 through the resistor R5, so that the switch tube Q3 is turned on, and then the switch module 21 stays in the off state.

[0066] In yet another embodiment, as shown in FIG. 3, the protection module 22 further includes a capacitor C2. The first end of the capacitor C2 is connected with the control end of the switch tube Q3. The second end of the capacitor C2 is used for grounding. Figure 3

[0067] ​​The capacitor C2 is used to receive the driving signal to delay the switch-on of the switch tube Q3. It is to be noted that when the controller 30 outputs the driving signal, the switch module 21 will be switched on based on the driving signal, and the driving signal will also charge the capacitor C2 through the resistor R5. During the charging of the capacitor C2, the switch tube Q4 will be switched on based on the first control signal to pull down the voltage of the switch tube Q3. At this time, even if the voltage of the capacitor C2 meets the switch-on threshold of the switch tube Q3, the switch tube Q3 is still in the off state. When the switch tube Q4 is switched off based on the second control signal, the switch tube Q3 will be switched on based on the voltage stored in the capacitor C2. When the switch tube Q3 is switched on, the switch module 21 will be in the off state, and at this time, the switch tube Q3 will also be continuously switched on based on the driving signal.

[0068] In some embodiments, as shown in Figure 2 The switch module 21 includes a second control unit 211 and a switch unit 212.

[0069] The second control unit 211 is connected with the switch unit 212, the switch unit 212 is connected with the detection module 23, and the second control unit 211 is further used to receive a driving signal. The switch unit 212 is further connected with the battery 10.

[0070] The second control unit 211 is used to receive an off signal output by the protection module 22, and stop working based on the off signal to control the switch unit 212 to be disconnected; and

[0071] When the off signal is not received, start working according to the driving signal to control the switch unit 212 to be connected, so as to output the power supply voltage of the battery 10.

[0072] Specifically, the second control unit 211 is used to receive a driving signal output by the controller 30 or an off signal output by the protection module 22. When the off signal is not received, control the switch unit 212 to be switched on according to the driving signal to output the power supply voltage of the battery 10 to the direct current power supply 200. When the off signal is received, control the switch unit 212 to be switched off according to the off signal to stop transmitting the power supply voltage of the battery 10.

[0073] In some embodiments, as shown in Figure 3 The second control unit 211 includes a switch tube Q2, a resistor R4 and a resistor R6; and the switch unit 212 includes a switch tube Q1, a resistor R1 and a resistor R2.

[0074] The control end of the switch tube Q2 receives a driving signal through the resistor R4, and is also connected with the second end of the switch tube Q2 through the resistor R6. The first end of the switch tube Q2 is connected with the switch unit 212, and the second end of the switch tube Q2 is grounded.

[0075] The control end of the switch tube Q1 is connected with the second control unit 211 through the resistor R2. The first end of the switch tube Q1 is connected with the battery 10, and is also connected with the control end of the switch tube Q1 through the resistor R1. The second end of the switch tube Q1 is connected with the electrical equipment.

[0076] It can be known that the electrical equipment is the direct current power supply 200. When the switch tube Q3 starts to work according to the driving signal, the voltage of the control end of the switch tube Q2 is pulled low (i.e. the second control unit 211 receives an off signal), and when the voltage of the control end of the switch tube Q2 is pulled low, the switch tube Q2 is in the off state, and the switch tube Q1 is also in the off state, so as to stop outputting the power supply voltage of the battery 10. When the switch tube Q3 is off based on the switch tube Q4, the switch tube Q2 receives the driving signal output by the controller 30 and is turned on based on the driving signal. When the switch tube Q2 is turned on, the switch tube Q1 is also turned on, so as to output the power supply voltage of the battery 10 to the direct current power supply 200. It should be noted that the driving signal is a continuous high-level signal, so when the switch tube Q3 stops working, the switch tube Q2 will be continuously turned on based on the driving signal, so as to maintain the switch tube Q1 in the on state, and thus the energy storage power supply 100 continuously outputs the power supply voltage to the direct current power supply 200. If the switch tube Q3 is turned on based on the driving signal, the control end of the switch tube Q2 will be pulled low by the switch tube Q3, so that the switch tube Q2 is in the off state, the switch tube Q1 is also in the off state, and thus the energy storage power supply 100 stops outputting the power supply voltage.

[0077] In some embodiments, as Figure 3As shown, when the energy storage power supply 100 supplies power to the load 300 through the DC power supply 200, the controller 30 outputs a driving signal to the control terminals of the switch tube Q2 and the switch tube Q3. At this time, the driving signal controls the switch tube Q2 to be turned on and charges the capacitor C2. After the switch tube Q2 is turned on, the switch tube Q1 is also turned on, and the power supply voltage of the battery 10 is output to the DC power supply 200 through the switch tube Q1. At this time, if the DC power supply 200 is in a normal working state, the battery voltage output by the switch tube Q1 will break through the Zener diode ZD1 and flow into the control terminal of the switch tube Q4 through the Zener diode ZD1 to control the switch tube Q4 to be turned on. After the switch tube Q4 is turned on, the control terminal voltage of the switch tube Q3 is pulled low, so that the switch tube Q3 is in an off state. At this time, the switch tube Q2 can be continuously turned on based on the driving signal, so that the energy storage power supply 100 continuously outputs voltage to the DC power supply 200. If the output end of the DC power supply 200 is in a short-circuit state, the power supply voltage of the battery 10 will be pulled low, so that the power supply voltage output by the switch tube Q1 is not enough to break through the Zener diode ZD1. When the Zener diode ZD1 is not broken through, the switch tube Q4 is also turned off. At this time, the switch tube Q3 is turned on based on the driving signal. After the switch tube Q3 is turned on, the control terminal voltage of the switch tube Q2 is pulled low, so that the switch tube Q2 is in an off state, and the switch tube Q1 is also turned off, thereby stopping the energy storage power supply 100 from outputting power supply voltage. Based on this, the short-circuit protection circuit 20 can monitor the output voltage of the battery 10 in real time, thereby protecting the energy storage power supply 100 and prolonging the service life of the energy storage power supply 100.

[0078] The utility model discloses a short circuit protection circuit the short circuit protection circuit includes switch module, protection module and detection module, the switch module is connected with detection module and protection module respectively, detection module is connected with protection module, the switch module still is connected with battery, the switch module and protection module still are all used for receiving drive signal. The switch module is used for starting work according to drive signal after receiving drive signal, to export power supply voltage of battery to consumer equipment, detection module is used for detecting the output voltage of switch module, and when the output voltage is greater than preset voltage, control protection module stops working, to make switch module continue to work according to drive signal, to make switch module continue transmission power supply voltage, and when the output voltage is less than preset voltage, then think that consumer equipment is in short circuit state, control protection module works based on drive signal at this time, to make switch module stop working, to avoid the condition of the emergence of the battery still in working condition and lead to the failure of energy storage power supply when consumer equipment short circuit, further improve the service life of energy storage power supply.

[0079] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the utility model, but not to limit them; under the idea of the utility model, the technical features of the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above, which are not provided in details for simplicity; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A short-circuit protection circuit, characterized by comprising: The short circuit protection circuit comprises a switching module, a protection module and a detection module; The switching module is connected with the detection module and the protection module respectively, the detection module is connected with the protection module, and the switching module is further connected with a battery; the switching module and the protection module are further configured to receive a driving signal; The switching module is configured to start working according to the driving signal to output a power voltage of the battery after receiving the driving signal; The detection module is configured to detect an output voltage of the switching module, and control the protection module to stop working when the output voltage is greater than a preset voltage, so that the switching module continues to work according to the driving signal; and control the protection module to work based on the driving signal when the output voltage is less than the preset voltage, so as to control the switching module to stop working based on the protection module, thereby stopping outputting the power voltage.

2. The short circuit protection circuit according to claim 1, characterized in that The detection module comprises a detection unit and a first control unit; The detection unit is connected with the switching module and the first control unit respectively, and the first control unit is connected with the protection module; The detection unit is configured to detect an output voltage of the switching module, and output a first control signal to the first control unit when the output voltage is greater than a preset voltage, so that the first control unit controls the protection module to stop working according to the first control signal; and output a second control signal to the first control unit when the output voltage is less than the preset voltage, so that the first control unit controls the protection module to start working according to the second control signal, thereby disconnecting the switching module.

3. The short circuit protection circuit of claim 2, wherein The detection unit comprises a voltage stabilizing tube ZD1; The cathode of the voltage stabilizing tube ZD1 is connected with the switching module, and the anode of the voltage stabilizing tube ZD1 is connected with the first control unit.

4. The short circuit protection circuit of claim 2, wherein The first control unit comprises a resistor R7, a resistor R9 and a switching tube Q4; The control end of the switching tube Q4 is connected with the detection unit through the resistor R7, the control end of the switching tube Q4 is further connected with the second end of the switching tube Q4 through the resistor R9, the first end of the switching tube Q4 is connected with the protection module, and the second end of the switching tube Q4 is configured to be grounded.

5. The short circuit protection circuit of claim 1, wherein The protection module comprises a switching tube Q3, a resistor R5 and a resistor R8; The control end of the switching tube Q3 receives a driving signal through the resistor R5, the control end of the switching tube Q3 is further connected with the detection module, and the control end of the switching tube Q3 is further connected with the second end of the switching tube Q3 through the resistor R8; the first end of the switching tube Q3 is connected with the switching module, and the second end of the switching tube Q3 is configured to be grounded.

6. The short circuit protection circuit of claim 5, wherein The protection module further comprises a capacitor C2; The first end of the capacitor C2 is connected with the control end of the switching tube Q3, and the second end of the capacitor C2 is configured to be grounded; The capacitor C2 is configured to receive the driving signal, so that the switching tube Q3 is turned on in delay.

7. The short circuit protection circuit of claim 1, wherein The switching module comprises a second control unit and a switching unit; The second control unit is connected with the switch unit, and the switch unit is connected with the detection module; the second control unit is also used for receiving a driving signal, and the switch unit is also connected with the battery; The second control unit is used for receiving an off signal output by the protection module and stopping working based on the off signal to control the switch unit to be disconnected; and When the off signal is not received, the second control unit starts working according to the driving signal to control the switch unit to be connected, so as to output the power voltage of the battery.

8. The short circuit protection circuit of claim 7, wherein The second control unit comprises a switch tube Q2, a resistor R4 and a resistor R6; The control end of the switch tube Q2 receives a driving signal through the resistor R4, and the control end of the switch tube Q2 is also connected with the second end of the switch tube Q2 through the resistor R6; the first end of the switch tube Q2 is connected with the switch unit, and the second end of the switch tube Q2 is used for grounding.

9. The short circuit protection circuit of claim 7, wherein The switch unit comprises a switch tube Q1, a resistor R1 and a resistor R2; The control end of the switch tube Q1 is connected with the second control unit through the resistor R2; the first end of the switch tube Q1 is connected with the battery; the first end of the switch tube Q1 is also connected with the control end of the switch tube Q1 through the resistor R1; and the second end of the switch tube Q1 is used for connecting an electric device.

10. An energy storage power supply, characterized by, The energy storage power supply comprises: a battery; and The short circuit protection circuit according to any one of claims 1-9.

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