Input overvoltage protection circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supply mainly provides input overvoltage protection circuit and energy storage system, and this circuit includes control module, and the flyback module and detection module connected with control module respectively, and detection module, control module and flyback module still all are connected with power supply. Detection module judges whether the power voltage exceeds the preset voltage through real -time detection power voltage of power supply. If not exceed the preset voltage, then make control module receive power voltage, and according to power voltage control flyback module normal work to output power voltage. And when power voltage exceeds the preset voltage, detection module will output control signal to control module, so that control module stops working according to the control signal, thereby control flyback module stops working to stop output power voltage, so that in power voltage overvoltage, timely disconnect output, avoid the damage of device, and then improve the security of energy storage system, prolong the service life of energy storage system.

Description

[Technical Field]

[0001] This utility model relates to the technical field of energy storage power supply, and in particular to an input overvoltage protection circuit and energy storage system. [Background Technology]

[0002] The stability of power input is crucial during the operation of electronic equipment. Due to factors such as mains voltage fluctuations, power supply equipment failures, or external electromagnetic interference, the input voltage often experiences abnormal increases. Once an input overvoltage occurs, the excessively high voltage in the preceding stage will directly impact the subsequent stage components, exceeding their withstand voltage range, thereby causing damage to the subsequent components and even leading to serious consequences such as equipment malfunction or system crash. Therefore, to protect components from damage during abnormal voltage conditions, it is necessary to provide an input overvoltage protection circuit. [Utility Model Content]

[0003] This utility model provides an input overvoltage protection circuit and an energy storage system, aiming to solve the technical problem of low safety in existing energy storage systems.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide an input overvoltage protection circuit, the input overvoltage protection circuit including a detection module, a control module and a flyback module;

[0005] The detection module is connected to the control module, the control module is connected to the flyback module, and the detection module, control module and flyback module are also connected to a power supply.

[0006] The detection module is used to detect the power supply voltage in real time and output a control signal when the power supply voltage exceeds a preset voltage.

[0007] The control module is configured to, when not receiving the control signal, output a drive signal to the flyback module based on the power supply voltage, so that the flyback module starts working and outputs the power supply voltage; and

[0008] Upon receiving the control signal, the output of the drive signal is stopped, thereby causing the flyback module to stop working and thus stopping the output of the power supply voltage.

[0009] Optionally, the flyback module includes a switch Q3, a transformer T1, a diode D3, a capacitor CE2, a resistor R7, and a resistor R11;

[0010] The control terminal of the switching transistor Q3 is connected to the control module. The first terminal of the switching transistor Q3 is connected to the first winding of the primary side of the transformer T1. The second terminal of the switching transistor Q3 is grounded through the resistor R11. The first winding of the primary side of the transformer T1 is also connected to the power supply. The second winding of the secondary side of the transformer T1 is connected to the anode of the diode D3. The cathode of the diode D3 is connected to the first terminal of the capacitor CE2. The second terminal of the capacitor CE2 is connected to the second winding of the secondary side of the transformer T1. The resistor R7 is connected in parallel with the capacitor CE2.

[0011] Optionally, the control module includes an input unit and a first control unit;

[0012] The input unit is connected to the power supply and the first control unit respectively. The first control unit is also connected to the flyback module, and the input unit is also connected to the detection module.

[0013] The input unit is used to receive the power supply voltage from the power source, and, when no control signal is received, to input an operating voltage to the first control unit based on the power supply voltage; and

[0014] Upon receiving the control signal, the input of the operating voltage to the first control unit is stopped;

[0015] The first control unit is configured to start working according to the working voltage after receiving the working voltage, and output a drive signal to the flyback module to make the flyback module start working.

[0016] Optionally, the input unit includes resistor R5, resistor R6, and diode D1;

[0017] The resistor R6 is connected to the power supply, and the resistor R6 is also connected to the anode of the diode D1 through the resistor R5. The cathode of the diode D1 is connected to the first control unit.

[0018] Optionally, the first control unit includes chip U1, resistors R8, R9, R10, R12 and capacitor C1;

[0019] The power supply pin of chip U1 is connected to the input unit. The power supply pin of chip U1 is also grounded through capacitor C1. The drive pin of chip U1 is connected to resistor R8. Resistor R8 is also connected to the control terminal of switch Q3 and resistor R9. Resistor R9 is also connected to the second terminal of switch Q3. The detection pin of chip U1 is connected to resistor R11 through resistor R10. The RT pin of chip U1 is grounded through resistor R12.

[0020] Optionally, the primary side of the transformer T1 further includes a feedback winding, and the first control unit further includes a diode D2, a capacitor CE3, a resistor R13, and a resistor R14;

[0021] The feedback winding of the primary side of the transformer T1 is connected to the anode of the diode D2. The cathode of the diode D2 is grounded through the capacitor CE3. The cathode of the diode D2 is also connected to the power supply pin of the chip U1. The feedback winding of the primary side of the transformer T1 is also connected to the resistor R14. The resistor R14 is connected to the feedback pin of the chip U1. The resistor R14 is also grounded through the resistor R13.

[0022] Optionally, the detection module includes a detection unit and a second control unit;

[0023] The detection unit is connected to the power supply and the second control unit respectively, and the second control unit is connected to the control module;

[0024] The detection unit is used to detect the power supply voltage in real time, and when the power supply voltage is greater than a preset voltage, it controls the second control unit to work so that the second control unit outputs a control signal to the control module.

[0025] Optionally, the detection unit includes resistors R1 and R2 and a Zener diode DZ1;

[0026] The resistor R1 is connected to the power supply, and the resistor R1 is also connected to the cathode of the Zener diode ZD1 through the resistor R2. The anode of the Zener diode ZD1 is connected to the second control unit.

[0027] Optionally, the second control unit includes a switch Q1, a switch Q2, a resistor R3, and a resistor R4;

[0028] The control terminal of the switch Q1 is connected to the detection unit. The control terminal of the switch Q1 is also grounded through the resistor R3. The first terminal of the switch Q1 is connected to the control terminal of the switch Q2. The control terminal of the switch Q2 is also grounded through the resistor R4. The first terminal of the switch Q2 is connected to the control module. The second terminals of both the switch Q1 and the switch Q2 are grounded.

[0029] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is: to provide an energy storage system, the energy storage system comprising:

[0030] Power supply; and

[0031] The input overvoltage protection circuit described above.

[0032] Unlike related technologies, this utility model provides an input overvoltage protection circuit and an energy storage system. The circuit includes a detection module, a control module, and a flyback module. The detection module is connected to the control module, and the control module is connected to the flyback module. All three modules are also connected to a power supply. The detection module monitors the power supply voltage in real time to determine if it exceeds a preset voltage. If the voltage does not exceed the preset voltage, the control module receives the power supply voltage and controls the flyback module to operate normally, thereby outputting the power supply voltage. When the power supply voltage exceeds the preset voltage, the detection module outputs a control signal to the control module, causing the control module to stop operating, thus stopping the flyback module from outputting the power supply voltage. This timely disconnection of the output when the power supply voltage is overvoltage prevents damage to components, thereby improving the safety and extending the lifespan of the energy storage system. [Attached Image Description]

[0033] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0034] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present utility model;

[0035] Figure 2 A circuit diagram of an input overvoltage protection circuit provided for an embodiment of this utility model;

[0036] Figure 3 This is a circuit diagram of an input overvoltage protection circuit provided in an embodiment of this utility model.

Detailed Implementation Methods

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0038] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0039] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0040] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0041] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0042] Please see Figure 1 , Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present utility model, such as... Figure 1 As shown, this application scenario 1 includes an energy storage system 100 and a load 200; the energy storage system 100 and the load 200 are connected, and the energy storage system 100 is used to supply power to the load 200.

[0043] Furthermore, such as Figure 1As shown, the energy storage system 100 includes a power supply 10 and an input overvoltage protection circuit 20; the power supply 10 is connected to the load 200 through the input overvoltage protection circuit 20. The power supply 10 supplies power to the load 200, but when the output voltage of the power supply 10 is too high, it can easily damage the load 200, thereby reducing the safety and reliability of the energy storage system 100. Therefore, when the energy storage system 100 supplies power to the load 200, the input voltage of the power supply 10 is input to the load 200 through the input overvoltage protection circuit 20. When the input voltage exceeds a preset voltage, the input overvoltage protection circuit 20 stops outputting, thereby preventing the power supply voltage of the power supply 10 from being input to the load 200, thus protecting the load 200 and improving the reliability of the energy storage system 100. The power supply 10 can be a photovoltaic input source, battery, or other power supply device. For example, when the power supply 10 is a photovoltaic input source, the input voltage of the photovoltaic input source is affected by the sunlight conditions, which may lead to an excessively high input voltage. If this input voltage is directly applied to the load 200, it may damage the load 200. Therefore, by introducing the input overvoltage protection circuit 20, the situation where a large voltage is applied to the load 200 and causes damage to the load 200 can be effectively prevented.

[0044] In some embodiments, please refer to Figure 2 , Figure 2 A circuit diagram of an input overvoltage protection circuit provided for an embodiment of this utility model is shown below. Figure 2 As shown, the input overvoltage protection circuit 20 includes a detection module 21, a control module 22, and a flyback module 23;

[0045] The detection module 21 is connected to the control module 22, the control module 22 is connected to the flyback module 23, and the detection module 21, the control module 22 and the flyback module 23 are also connected to the power supply 10.

[0046] The detection module 21 is used to detect the power supply voltage of the power supply 10 in real time, and output a control signal when the power supply voltage exceeds a preset voltage;

[0047] The control module 22 is configured to output a drive signal to the flyback module 23 based on the power supply voltage of the power supply 10 when no control signal is received, so that the flyback module 23 starts working and outputs the power supply voltage of the power supply 10; and

[0048] Upon receiving the control signal, the output of the drive signal is stopped, thereby causing the flyback module 23 to stop working and thus stop outputting the power supply voltage.

[0049] When the energy storage system 100 starts working, the power supply 10 outputs the power voltage to the detection module 21, the control module 22, and the flyback module 23. When the detection module 21 receives the power voltage, it determines whether the power voltage is greater than a preset voltage. If the power voltage is less than the preset voltage, the detection module 21 will not output a control signal to the control module 22. When the control module 22 does not receive the control signal, it receives the power voltage and outputs a drive signal to the flyback module 23 based on the power voltage, causing the flyback module 23 to start working based on the drive signal, thereby outputting the power voltage to the load 200.

[0050] If the power supply voltage is greater than the preset voltage, the detection module 21 will output a control signal to the control module 22. When the control module 22 receives the control signal, it will stop working based on the control signal, thereby stopping the output of the drive signal to the flyback module 23, so that the flyback module 23 stops working. After the flyback module 23 stops working, the power supply voltage will not be input to the load 200, thereby causing the load 200 to stop working and protecting the load 200 from damage.

[0051] In some embodiments, such as Figure 2 As shown, the detection module 21 includes a detection unit 211 and a second control unit 212;

[0052] The detection unit 221 is connected to the power supply 10 and the second control unit 212 respectively, and the second control unit 212 is connected to the control module 22;

[0053] The detection unit 211 is used to detect the power supply voltage of the power supply 10 in real time, and control the second control unit 212 to work when the power supply voltage is greater than the preset voltage, so that the second control unit 212 outputs a control signal to the control module 22.

[0054] When the energy storage system 100 starts working, the power supply 10 outputs a power voltage. When the detection unit 211 receives the power voltage, it checks whether the power voltage is greater than a preset voltage. When the power voltage is greater than the preset voltage, the detection unit 211 outputs a first signal to the second control unit 212, so that the second control unit 212 starts working based on the first signal, thereby outputting a control signal to the control module 22.

[0055] When the detection unit 211 detects that the power supply voltage is lower than the preset voltage, it outputs a second signal to the second control unit 212. Upon receiving the second signal, the second control unit 212 stops operating based on the second signal, thereby ceasing to output control signals to the control module 22.

[0056] In yet another embodiment, please refer to Figure 3 , Figure 3 This is a circuit diagram of an input overvoltage protection circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the detection unit 211 includes resistors R1 and R2 and a Zener diode DZ1;

[0057] The resistor R1 is connected to the power supply 10, and the resistor R1 is also connected to the cathode of the Zener diode ZD1 through the resistor R2. The anode of the Zener diode ZD1 is connected to the second control unit 212.

[0058] When the power supply 10 outputs a power voltage, this voltage is input to the Zener diode ZD1 through resistors R1 and R2. If the Zener diode ZD1 breaks down, the power voltage is considered to be greater than the preset voltage. The second control unit 212 receives the first signal and starts operating according to the first signal. If the Zener diode ZD1 does not break down, the power voltage is considered to be less than the preset voltage, and a second signal is output to the second control unit 212 to stop its operation. In this embodiment, the resistance values ​​of resistors R1 and R2, and the Zener voltage of the Zener diode ZD1, are set according to the preset voltage. Once the power voltage exceeds the preset voltage, an overvoltage condition is considered to have occurred, triggering overvoltage protection.

[0059] In yet another embodiment, such as Figure 3 As shown, the second control unit 212 includes a switching transistor Q1, a switching transistor Q2, a resistor R3, and a resistor R4;

[0060] The control terminal of the switch Q1 is connected to the detection unit 211. The control terminal of the switch Q1 is also grounded through the resistor R3. The first terminal of the switch Q1 is connected to the control terminal of the switch Q2. The control terminal of the switch Q2 is also grounded through the resistor R4. The first terminal of the switch Q2 is connected to the control module 22. The second terminals of both the switch Q1 and the switch Q2 are grounded.

[0061] Specifically, when the power supply voltage is greater than a preset voltage, the detection unit 211 outputs a first signal to the control terminal of the switching transistor Q1, causing the switching transistor Q1 to turn on based on the first signal. After the switching transistor Q1 turns on, the switching transistor Q2 also turns on. When the switching transistor Q2 turns on, the power supply voltage is consumed by the switching transistor Q2, thereby causing the control module 22 to receive a control signal and stop working based on the control signal.

[0062] If the power supply voltage is less than the preset voltage, the detection unit 211 will output a second signal to the control terminal of the switch Q1 to turn off the second signal of the switch Q1. When the switch Q1 is turned off, the switch Q2 will also be turned off, so that the control module 22 receives the power supply voltage and starts working based on the power supply voltage.

[0063] In some embodiments, such as Figure 2 As shown, the control module 22 includes an input unit 221 and a first control unit 222;

[0064] The input unit 221 is connected to the power supply 10 and the first control unit 222 respectively. The first control unit 222 is also connected to the flyback module 23. The input unit 221 is also connected to the detection module 21.

[0065] The input unit 221 is used to receive the power supply voltage of the power supply 10, and, when no control signal is received, input an operating voltage to the first control unit 222 based on the power supply voltage; and

[0066] Upon receiving the control signal, the input of the operating voltage to the first control unit 222 is stopped;

[0067] The first control unit 222 is used to start working according to the working voltage after receiving the working voltage, so as to output a drive signal to the flyback module 23, so that the flyback module 23 starts working.

[0068] When the power supply 10 outputs a power supply voltage, if the detection module 21 detects that the power supply voltage is less than the preset voltage, the detection module 21 will not output a control signal. At this time, the input unit 221 will receive the power supply voltage, convert it into a working voltage, and input it to the first control unit 222 so that the first control unit 222 starts working based on the working voltage; and when the first control unit 222 starts working, it will output a drive signal to the flyback module 23, thereby causing the flyback module 23 to start working.

[0069] If the detection module 21 detects that the power supply voltage is greater than a preset voltage, it will output a control signal to the input unit 221. Upon receiving the control signal, the input unit 221 will discharge the power supply voltage based on the control signal, thus preventing the first control unit 222 from receiving the operating voltage. At this time, the first control unit 222 will stop working, thereby stopping the output of the drive signal and consequently stopping the output of the power supply voltage to the load 200, thus ceasing to supply power to the load 200.

[0070] In some other embodiments, such as Figure 3 As shown, the input unit 221 includes resistor R5, resistor R6 and diode D1;

[0071] The resistor R6 is connected to the power supply 10, and the resistor R6 is also connected to the anode of the diode D1 through the resistor R5. The cathode of the diode D1 is connected to the first control unit 222.

[0072] Specifically, when the energy storage system 100 starts working, the power supply 10 outputs a power supply voltage. If the detection module 21 does not output a control signal, this power supply voltage is input to the first control unit 222 through resistors R6 and R5 and diode D1, causing the first control unit 222 to start working. However, if the detection module 21 outputs the control signal, the power supply voltage is input to the ground terminal through resistors R6 and R5 and diode D1, and is not input to the first control unit 222, causing the first control unit 222 to stop working.

[0073] In another embodiment, such as Figure 3 As shown, the flyback module 23 includes a switching transistor Q3, a transformer T1, a diode D3, a capacitor CE2, a resistor R7, and a resistor R11;

[0074] The control terminal of the switching transistor Q3 is connected to the control module 22. The first terminal of the switching transistor Q3 is connected to the first winding N1 of the primary side of the transformer T1. The second terminal of the switching transistor Q3 is grounded through the resistor R11. The first winding N1 of the primary side of the transformer T1 is also connected to the power supply 10. The second winding N3 of the secondary side of the transformer T1 is connected to the anode of the diode D3. The cathode of the diode D3 is connected to the first terminal of the capacitor CE2. The second terminal of the capacitor CE2 is connected to the second winding N3 of the secondary side of the transformer T1. The resistor R7 is connected in parallel with the capacitor CE2.

[0075] It should be noted that the drive signal is a pulse signal. When the control module 22 receives the power supply voltage, it inputs the drive signal to the control terminal of the switching transistor Q3, so that the switching transistor Q3 is turned on or off based on the drive signal. When the switching transistor Q3 is turned on, the power supply voltage of the power supply 10 flows into the ground terminal through the first winding N1 of the transformer T1, the switching transistor Q3, and the resistor R11. That is, the current on the first winding N1 of the primary side of the transformer T1 begins to rise. Since the diode D3 is in reverse bias at this time, the first winding N1 of the primary side of the transformer T1 begins to store energy. When the switching transistor Q3 is turned off based on the pulse signal, the current on the first winding N1 is reversed. At this time, the diode D3 is forward biased, and the second winding N3 of the secondary side of the transformer T1 charges the capacitor CE2 through the diode D3. Based on this, it can start working after receiving the drive signal output by the control module 22, thereby outputting the power supply voltage to the load 200 to supply power to the load 200.

[0076] In another embodiment, such as Figure 3 As shown, the first control unit 222 includes chip U1, resistors R8, R9, R10, R12 and capacitor C1;

[0077] The power supply pin (VDD) of chip U1 is connected to the input unit 221. The power supply pin of chip U1 is also grounded through capacitor C1. The drive pin (GATE) of chip U1 is connected to resistor R8. Resistor R8 is also connected to the control terminal of switch Q3 and resistor R9. Resistor R9 is also connected to the second terminal of switch Q3. The detection pin (SENSE) of chip U1 is connected to resistor R11 through resistor R10. The RT pin of chip U1 is grounded through resistor R12.

[0078] Specifically, when the input unit 221 does not receive the control signal, the power supply voltage will be input to the power supply pin of the chip U1 through the input unit 221, so that the chip U1 starts working based on the power supply voltage. After the chip U1 starts working, it will output a drive signal to the control terminal of the switching transistor Q3, so that the switching transistor Q3 starts working based on the drive signal.

[0079] When the input unit 221 receives the control signal, it will stop transmitting the power supply voltage to the power supply pin of the chip U1. When the chip U1 does not receive the power supply voltage, it will stop working and thus stop outputting the drive signal.

[0080] In another embodiment, such as Figure 3 As shown, the primary side of the transformer T1 also includes a feedback winding N2, and the first control unit 222 also includes a diode D2, a capacitor CE3, a resistor R13, and a resistor R14.

[0081] The feedback winding N2 of the primary side of the transformer T1 is connected to the anode of the diode D2. The cathode of the diode D2 is grounded through the capacitor CE3. The cathode of the diode D2 is also connected to the power supply pin of the chip U1. The feedback winding N2 of the primary side of the transformer T1 is also connected to the resistor R14. The resistor R14 is connected to the feedback pin (FB) of the chip U1. The resistor R14 is also grounded through the resistor R13.

[0082] When a corresponding current is generated in the second winding N3 of the secondary side of the transformer T1, current also flows through the feedback winding N2 of the primary side of the transformer T1. When current is generated in the feedback winding N2, this current is input to the capacitor CE3 through the diode D2 to charge the capacitor CE3. At the same time, the feedback pin of the chip U1 also receives the current signal from the feedback winding N2 through the resistors R13 and R14, and adjusts the drive signal according to the current signal, thereby stabilizing the output voltage of the transformer T1.

[0083] In some embodiments, after the capacitor CE3 has finished charging based on the current on the feedback winding N2, the capacitor CE3 will also discharge to the power supply pin of the chip U1 to provide the chip U1 with an operating voltage, thereby enabling the chip U1 to start working based on the discharge voltage of the capacitor CE3.

[0084] In some embodiments, such as Figure 3 As shown, when the energy storage system 100 starts working, the power supply voltage of the power supply 10 is input to the Zener diode ZD1 through resistors R1 and R2. At this time, if the Zener diode ZD1 is not broken down, the switching transistors Q1 and Q2 are in the off state (no control signal output), thereby allowing the power supply voltage to be input to the power pin of the chip U1 through resistors R6 and R5 and diode D1, causing the chip U1 to start working. After the chip U1 starts working, it outputs a pulse signal (drive signal) to the switching transistor Q3, causing Q3 to cycle through turning on and off. During the on / off process of the switching transistor Q3, the transformer T1 transmits the power supply voltage to the load 200, causing the load 200 to start working.

[0085] When the power supply voltage is overvoltage, the Zener diode ZD1 breaks down, causing the switching transistors Q1 and Q2 to conduct. With Q2 conducting, the power supply voltage flows to ground through resistors R6 and R5, diode D1, and Q2, preventing the power supply pins of chip U1 from receiving operating voltage and causing chip U1 to stop working. When chip U1 stops working, it does not output a drive signal, causing transformer T1 to stop transmitting the power supply voltage, thereby stopping the load 200 from operating, protecting it from damage, and improving the reliability of the energy storage system 100.

[0086] This utility model embodiment provides an input overvoltage protection circuit, which includes a detection module, a control module, and a flyback module. The detection module is connected to the control module, and the control module is connected to the flyback module. All three modules are also connected to a power supply. The detection module detects the power supply voltage in real time to determine whether the voltage exceeds a preset voltage. If the voltage does not exceed the preset voltage, the control module receives the power supply voltage and controls the flyback module to operate normally, thereby outputting the power supply voltage. When the power supply voltage exceeds the preset voltage, the detection module outputs a control signal to the control module, causing the control module to stop operating, thus stopping the flyback module from outputting the power supply voltage. This ensures timely disconnection of the output when the power supply voltage is overvoltaged, preventing damage to the components, thereby improving the safety of the energy storage system and extending its service life.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An input overvoltage protection circuit, characterized in that, The input overvoltage protection circuit includes a detection module, a control module, and a flyback module; The detection module is connected to the control module, the control module is connected to the flyback module, and the detection module, control module and flyback module are also connected to a power supply. The detection module is used to detect the power supply voltage in real time and output a control signal when the power supply voltage exceeds a preset voltage. The control module is used to output a drive signal to the flyback module based on the power supply voltage when the control signal is not received, so as to start the flyback module to work and output the power supply voltage of the power supply. as well as Upon receiving the control signal, the output of the drive signal is stopped, thereby causing the flyback module to stop working and thus stopping the output of the power supply voltage.

2. The input overvoltage protection circuit according to claim 1, characterized in that, The flyback module includes a switch Q3, a transformer T1, a diode D3, a capacitor CE2, a resistor R7, and a resistor R11; The control terminal of the switching transistor Q3 is connected to the control module. The first terminal of the switching transistor Q3 is connected to the first winding of the primary side of the transformer T1. The second terminal of the switching transistor Q3 is grounded through the resistor R11. The first winding of the primary side of the transformer T1 is also connected to the power supply. The second winding of the secondary side of the transformer T1 is connected to the anode of the diode D3. The cathode of the diode D3 is connected to the first terminal of the capacitor CE2. The second terminal of the capacitor CE2 is connected to the second winding of the secondary side of the transformer T1. The resistor R7 is connected in parallel with the capacitor CE2.

3. The input overvoltage protection circuit according to claim 2, characterized in that, The control module includes an input unit and a first control unit; The input unit is connected to the power supply and the first control unit respectively. The first control unit is also connected to the flyback module, and the input unit is also connected to the detection module. The input unit is used to receive the power supply voltage of the power supply, and input the operating voltage to the first control unit based on the power supply voltage when the control signal is not received; as well as Upon receiving the control signal, the input of the operating voltage to the first control unit is stopped; The first control unit is configured to start working according to the working voltage after receiving the working voltage, and output a drive signal to the flyback module to make the flyback module start working.

4. The input overvoltage protection circuit according to claim 3, characterized in that, The input unit includes resistor R5, resistor R6, and diode D1; The resistor R6 is connected to the power supply, and the resistor R6 is also connected to the anode of the diode D1 through the resistor R5. The cathode of the diode D1 is connected to the first control unit.

5. The input overvoltage protection circuit according to claim 3, characterized in that, The first control unit includes chip U1, resistors R8, R9, R10, R12 and capacitor C1; The power supply pin of chip U1 is connected to the input unit. The power supply pin of chip U1 is also grounded through capacitor C1. The drive pin of chip U1 is connected to resistor R8. Resistor R8 is also connected to the control terminal of switch Q3 and resistor R9. Resistor R9 is also connected to the second terminal of switch Q3. The detection pin of chip U1 is connected to resistor R11 through resistor R10. The RT pin of chip U1 is grounded through resistor R12.

6. The input overvoltage protection circuit according to claim 5, characterized in that, The primary side of the transformer T1 also includes a feedback winding, and the first control unit also includes a diode D2, a capacitor CE3, a resistor R13, and a resistor R14. The feedback winding of the primary side of the transformer T1 is connected to the anode of the diode D2. The cathode of the diode D2 is grounded through the capacitor CE3. The cathode of the diode D2 is also connected to the power supply pin of the chip U1. The feedback winding of the primary side of the transformer T1 is also connected to the resistor R14. The resistor R14 is connected to the feedback pin of the chip U1. The resistor R14 is also grounded through the resistor R13.

7. The input overvoltage protection circuit according to claim 1, characterized in that, The detection module includes a detection unit and a second control unit; The detection unit is connected to the power supply and the second control unit respectively, and the second control unit is connected to the control module; The detection unit is used to detect the power supply voltage in real time, and when the power supply voltage is greater than a preset voltage, it controls the second control unit to work so that the second control unit outputs a control signal to the control module.

8. The input overvoltage protection circuit according to claim 7, characterized in that, The detection unit includes resistor R1, resistor R2, and Zener diode DZ1; The resistor R1 is connected to the power supply, and the resistor R1 is also connected to the cathode of the Zener diode ZD1 through the resistor R2. The anode of the Zener diode ZD1 is connected to the second control unit.

9. The input overvoltage protection circuit according to claim 7, characterized in that, The second control unit includes a switch Q1, a switch Q2, a resistor R3, and a resistor R4; The control terminal of the switch Q1 is connected to the detection unit. The control terminal of the switch Q1 is also grounded through the resistor R3. The first terminal of the switch Q1 is connected to the control terminal of the switch Q2. The control terminal of the switch Q2 is also grounded through the resistor R4. The first terminal of the switch Q2 is connected to the control module. The second terminals of both the switch Q1 and the switch Q2 are grounded.

10. An energy storage system, characterized in that, The energy storage system includes: Power supply; and The input overvoltage protection circuit as described in any one of claims 1-9.

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