Negative voltage turn-off circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supply mainly provides a kind of negative pressure shutdown circuit and energy storage system, the circuit includes energy storage control module, and the negative pressure generation module and isolation conducting module are connected with energy storage control module respectively, and energy storage control module is also connected with first power supply, and isolation conducting module is also used to connect controlled device, and control module is also used to receive pulse signal.Energy storage control module is used to receive the first voltage of first power supply when pulse signal is first state, and start charging based on first voltage;And when pulse signal is second state, discharge to drive negative pressure generation module to generate negative pressure to negative pressure generation module, simultaneously, output first control signal control isolation conducting module enters first conducting state, to accurately input negative pressure to controlled device. Based on this, it can save cost while making controlled device shut down quickly, so as to avoid the emergence of controlled device misdirected on, and then improve the reliability of energy storage system.

Description

[Technical Field] This utility model relates to the technical field of energy storage power supply, and in particular to a negative pressure shutdown circuit and energy storage system. [Background Technology] In power electronic systems, the reliability and switching losses of switching devices (such as MOSFETs or IGBTs) in DC-DC, DC-AC, and AC-DC converters are key factors affecting system performance. Especially in high-frequency switching applications, the rapid turn-on and turn-off of the switching transistors significantly impact efficiency, electromagnetic interference (EMI), and device lifespan. Traditional drive circuits typically employ positive voltage turn-on and zero voltage turn-off. However, due to the unavoidable parasitic parameters such as parasitic inductance and capacitance in power circuits, as well as the influence of diode reverse recovery current, the switching devices are prone to generating sharp voltage spikes at the moment of turn-off. This can lead to device breakdown or accidental turn-on, thereby reducing system reliability.

[0001] To address the reliability issues of traditional drive methods during the turn-off phase, negative voltage turn-off technology has gradually become an important optimization direction for power device drive circuits. Its core principle is to apply a negative voltage at the instant the switching device turns off, ensuring rapid and complete turn-off and avoiding false turn-on caused by gate voltage oscillations or noise. Simultaneously, the presence of the negative voltage can effectively suppress voltage spikes during the turn-off process, reducing the electrical stress on the device and extending its lifespan. However, traditional negative voltage turn-off circuits typically require complex isolation power supplies or additional driver chips, increasing system cost and design complexity. [Utility Model Content] This utility model provides a negative pressure shutdown circuit and an energy storage system, aiming to solve the technical problems of high cost and low reliability of negative pressure shutdown circuits in existing energy storage systems.

[0002] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide a negative pressure shutdown circuit, the negative pressure shutdown circuit including an energy storage control module, a negative pressure generation module and an isolation conduction module; The energy storage control module is connected to the negative pressure generation module and the isolation and conduction module respectively. The energy storage control module is also connected to the first power supply. The isolation and conduction module is also used to connect the controlled device. The energy storage control module is also used to receive pulse signals. The energy storage control module is used to receive a first voltage from the first power source when the pulse signal is in a first state, and to start charging based on the first voltage; and When the pulse signal is in the second state, a first control signal is output, and the negative pressure generating module is started to discharge, so that the negative pressure generating module generates negative pressure; The isolation and conduction module is used to enter a first conduction state according to the first control signal when it receives the first control signal, thereby outputting the negative pressure in the negative pressure generation module to the controlled device.

[0003] Optionally, the isolation and conduction module is also used to connect to a second power source; The energy storage control module is also used to output a second control signal to the isolation conduction module when the pulse signal is in the first state; The isolation and conduction module is used to enter a second conduction state when it receives the second control signal, so as to input the second voltage of the second power supply to the controlled device, thereby controlling the controlled device to conduct.

[0004] Optionally, the energy storage control module includes a control unit, a switching unit, and an energy storage unit; The control unit is connected to the switching unit and the isolation and conduction module respectively. The switching unit is also connected to the energy storage unit and the negative pressure generation module. The control unit is also used to connect to a third power source. The switching unit is also used to connect to a first power source. The control unit is also used to receive the pulse signal. The control unit is configured to output a second control signal to the isolation conduction module when the pulse signal is in the first state, and control the switching unit to enter the second operating state, thereby enabling the switching unit to transmit the first voltage; and When the pulse signal is in the second state, a first control signal is output, and the switching unit is controlled to enter the first working state; The energy storage unit is used to begin charging based on the first voltage output by the switching unit when the switching unit enters the second operating state; and When the switching unit enters the first working state, the negative pressure generating module is discharged based on the switching unit, so that the negative pressure generating module generates negative pressure.

[0005] Optionally, the control unit includes a switch Q8, a resistor R7, a resistor R11, and a resistor R12; The control terminal of the switch Q8 receives pulse signals through the resistor R11. The control terminal of the switch Q8 is also grounded through the resistor R12. The first terminal of the switch Q8 is connected to the third power supply through the resistor R7. The first terminal of the switch Q8 is also connected to the switch unit and the isolation conduction module respectively.

[0006] Optionally, the switching unit includes a switching transistor Q5, a switching transistor Q7, and a resistor R8; The control terminal of the switching transistor Q5 is connected to the control unit. The first terminal of the switching transistor Q5 is connected to the first power supply through the resistor R8. The second terminal of the switching transistor Q5 is connected to the energy storage unit and the first terminal of the switching transistor Q7. The control terminal of the switching transistor Q7 is connected to the control unit. The second terminal of the switching transistor Q7 is connected to the negative pressure generation module. The second terminal of the switching transistor Q7 is also used for grounding.

[0007] Optionally, the energy storage unit includes a capacitor C1 and a diode D1; The first terminal of capacitor C1 is connected to the second terminal of switch Q5 and the first terminal of switch Q7, respectively. The second terminal of capacitor C1 is connected to the anode of diode D1, and the cathode of diode D1 is used for grounding.

[0008] Optionally, the negative pressure generating module includes a capacitor C2 and a diode D2; The first end of the capacitor C2 is used for grounding, the second end of the capacitor C2 is connected to the isolation and conduction module, the second end of the capacitor C2 is also connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the energy storage unit.

[0009] Optionally, the isolation and conduction module includes a switch Q1, a switch Q2, a resistor R1, and a resistor R2; The control terminal of the switch Q1 is connected to the energy storage control module through the resistor R2. The first terminal of the switch Q1 is connected to the second power supply through the resistor R1. The second terminal of the switch Q1 is connected to the controlled device and the first terminal of the switch Q2. The control terminal of the switch Q2 is connected to the resistor R2. The second terminal of the switch Q2 is connected to the negative pressure generation module.

[0010] Optionally, the isolation and conduction module further includes resistor R3, resistor R9, and diode D3; The first end of the resistor R9 is connected to the second end of the switch Q1, the second end of the resistor R9 is connected to the controlled device, the second end of the resistor R9 is also grounded through the resistor R3, the cathode of the diode D3 is connected to the first end of the switch Q2, and the anode of the diode D3 is connected to the controlled device.

[0011] 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: Controller; Controlled devices; and The negative voltage shutdown circuit described above.

[0012] Unlike related technologies, this utility model provides a negative pressure shutdown circuit and energy storage system. The negative pressure shutdown circuit includes an energy storage control module, a negative pressure generation module, and an isolation conduction module. The energy storage control module is connected to both the negative pressure generation module and the isolation conduction module, and is also connected to a first power source. The isolation conduction module is used to connect to a controlled device, and the control module is also used to receive pulse signals. When the pulse signal is in a first state, the energy storage control module receives a first voltage from the first power source and starts charging based on the first voltage. When the pulse signal is in a second state, it discharges the negative pressure generation module to drive it to generate a negative pressure, while simultaneously outputting a first control signal to control the isolation conduction module to enter a first conduction state, thereby accurately inputting the negative pressure to the controlled device. Based on this, the controlled device can be quickly shut off while saving costs, thus avoiding mis-conduction and improving the reliability of the energy storage system. [Attached Image Description] 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.

[0013] Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention; Figure 2 This is a structural block diagram of a negative pressure shut-off circuit provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of a negative pressure shutdown circuit provided in an embodiment of the present invention.

Detailed Implementation Methods

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] Please see Figure 1 , Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the energy storage system 100 includes a controller 10 and a controlled device 20.

[0019] In some embodiments, the controlled device 20 may be a power device such as a transistor, MOSFET, or IGBT. The controlled device 20 receives pulse signals output by the controller 10 and turns on or off based on these pulse signals. However, when the controlled device 20 turns off based on the pulse signal, due to the inherent characteristics of the power device, current spikes may occur due to parasitic parameters or reverse current, potentially damaging the controlled device 20 or even causing false turn-on. Therefore, to improve the stability of the energy storage system 100, such as... Figure 1 As shown, the energy storage system 100 also includes a negative voltage shutdown circuit 30, which is connected to both the controlled device 20 and the controller 10. The negative voltage shutdown circuit 30 receives pulse signals output by the controller 10 and, when the pulse signal is in a first state, controls the controlled device 20 to operate normally (conduct); while, when the pulse signal is in a second state, it generates a negative voltage and applies it to the controlled device 20, causing the controlled device 20 to quickly shut down based on the negative voltage. This avoids voltage spikes during shutdown, thereby protecting the controlled device 20 and improving the reliability of the energy storage system 100.

[0020] In some embodiments, the controlled device 20 can form a voltage conversion circuit such as a converter. During the operation of the converter, the controlled device 20 periodically turns on or off based on the pulse signal output by the controller 10 to output the target voltage. Therefore, in order to avoid voltage spikes or other issues when the controlled device 20 in the converter is turned off, when the controller 10 outputs a pulse signal, the negative voltage shutdown circuit 30 receives the pulse signal and generates a negative voltage based on the pulse signal. This allows the controlled device 20 to receive the negative voltage and turn off when it needs to be turned off, thereby improving the service life of the controlled device 20 while controlling its rapid shutdown.

[0021] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a negative voltage shutdown circuit provided in an embodiment of this utility model, as shown below. Figure 2 As shown, the negative pressure shutdown circuit 30 includes an energy storage control module 31, a negative pressure generation module 32, and an isolation conduction module 33; The energy storage control module 31 is connected to the negative pressure generation module 32 and the isolation and conduction module 33 respectively. The energy storage control module 31 is also connected to the first power supply (not shown). The isolation and conduction module 33 is also used to connect the controlled device 20. The energy storage control module 31 is also used to receive pulse signals. The energy storage control module 31 is used to receive a first voltage from the first power source when the pulse signal is in a first state, and to start charging based on the first voltage; and When the pulse signal is in the second state, a first control signal is output, and the negative pressure generating module 32 is discharged to generate negative pressure. The isolation and conduction module 33 is used to enter a first conduction state based on the first control signal when it receives the first control signal, thereby outputting the negative pressure in the negative pressure generation module 32 to the controlled device 20.

[0022] Specifically, when the controller 10 outputs a pulse signal, the energy storage control module 31 receives the pulse signal. If the pulse signal is in a first state, the energy storage control module 31 receives the first voltage from the first power source and begins charging based on the first voltage. When the pulse signal is in a second state, on one hand, the energy storage control module 31 outputs a first control signal to the isolation and conduction module 33, causing the isolation and conduction module 33 to enter a first conduction state based on the first control signal; on the other hand, the energy storage control module 31 also begins discharging the negative pressure generation module 32 based on the pulse signal, causing the negative pressure generation module 32 to generate a negative charge. When the isolation and conduction module 33 enters the first conduction state and the negative pressure generation module 32 generates a negative pressure, the negative pressure generated by the negative pressure generation module 32 is applied to the control terminal of the controlled device 20 through the isolation and conduction module 33, thereby causing the controlled device 20 to quickly shut down based on the negative pressure, thus improving the reliability of the energy storage system 100.

[0023] In yet another embodiment, the isolation and conduction module 33 is also used to connect to a second power source (not shown); The energy storage control module 31 is also used to output a second control signal to the isolation and conduction module 33 when the pulse signal is in the first state; The isolation and conduction module 33 is used to enter a second conduction state when it receives the second control signal, so as to input the second voltage of the second power supply to the controlled device 20, thereby controlling the controlled device 20 to conduct.

[0024] Specifically, when the pulse signal is in the first state, the energy storage control module 31 will also output a second control signal to the isolation and conduction module 33. When the isolation and conduction module 33 receives the second control signal, it will enter the second conduction state based on the second control signal. At this time, the second voltage of the second power supply will be input to the controlled device 20 through the isolation and conduction module 33, so that the controlled device 20 can operate normally based on the second voltage.

[0025] In some embodiments, the first state of the pulse signal is a low-level signal, and the second state of the pulse signal is a high-level signal. When the energy storage control module 31 receives the low-level signal, the energy storage control module 31 starts charging; when it receives the low-level signal again, the energy storage control module 31 starts discharging, thereby causing the negative pressure generation module 32 to generate a negative pressure.

[0026] In yet another embodiment, such as Figure 2 As shown, the energy storage control module 31 includes a control unit 311, a switching unit 312, and an energy storage unit 313; The control unit 311 is connected to the switch unit 312 and the isolation and conduction module 33 respectively. The switch unit 312 is also connected to the energy storage unit 313 and the negative pressure generation module 32. The control unit 311 is also used to connect to a third power source. The switch unit 312 is also used to connect to a first power source. The control unit 311 is also used to receive the pulse signal. The control unit 311 is used to output a second control signal to the isolation conduction module 33 when the pulse signal is in the first state, and to control the switching unit 312 to enter the second working state, thereby enabling the switching unit 312 to transmit the first voltage; and When the pulse signal is in the second state, a first control signal is output, and the switching unit 312 is controlled to enter the first working state; The energy storage unit 313 is used to start charging based on the first voltage output by the switching unit 312 when the switching unit 312 enters the second operating state; and When the switching unit 312 enters the first working state, the negative pressure generating module 32 is discharged based on the switching unit 312, so that the negative pressure generating module 32 generates negative pressure.

[0027] Specifically, when the controller 10 outputs a pulse signal, the control unit 311 receives the pulse signal. If the pulse signal is in a first state, the control unit 311 will stop working based on the pulse signal, thereby allowing the third voltage of the third power supply to be input to the switching unit 312, causing the switching unit 312 to enter a second working state. When the switching unit 312 enters the second working state, it will receive and transmit the first voltage of the first power supply to the energy storage unit 313, so that the energy storage unit 313 can start charging based on the first voltage. On the other hand, the control unit 311 will also output a second control signal to the isolation and conduction module 33 based on the pulse signal, so that the isolation and conduction module 33 can enter a second conduction state based on the second control signal. At this time, the second voltage of the second power supply will be input to the controlled device 20 through the isolation and conduction module 33, thereby enabling the controlled device 20 to work normally (conduct).

[0028] If the pulse signal is in the second state, the control unit 311 will start working based on the pulse signal. On one hand, the control unit 311 will control the switching unit 312 to enter the first working state. When the switching unit 312 enters the first working state, the energy storage unit 313 will start discharging to the negative pressure generating module 32 based on the switching unit 312, thereby causing the negative pressure generating module 32 to generate negative pressure. On the other hand, the control unit 311 will output a first control signal to the isolation conduction module 33, so that the isolation conduction module 33 enters the first conduction state based on the first control signal. At this time, the negative pressure generated by the negative pressure generating module 32 will be applied to the control terminal of the controlled device 20 through the isolation conduction module 33, thereby causing the controlled device 20 to turn off quickly, thus avoiding the generation of surge voltage at the moment of turn-off and improving the service life of the controlled device 20.

[0029] In some embodiments, the first power supply, the second power supply, and the third power supply can be power supplies with the same voltage or power supplies with different voltages. By setting different power supplies for each module, electrical isolation is achieved between modules while realizing zoned power supply, avoiding mutual interference between modules, and thus improving the reliability of the energy storage system 100. The negative pressure generated by the negative pressure generation module 32 is determined by the first voltage of the first power supply. Therefore, when setting the first power supply, the parameters of the controlled device 20 need to be referenced to avoid the generated negative pressure failing to accurately and quickly control the controlled device 20 to shut down.

[0030] In some embodiments, please refer to Figure 3 , Figure 3 This is a circuit diagram of a negative voltage shutdown circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the control unit 311 includes a switch Q8, a resistor R7, a resistor R11, and a resistor R12; the switching unit 312 includes a switch Q5, a switch Q7, and a resistor R8; the energy storage unit 313 includes a capacitor C1 and a diode D1. The control terminal of the switch Q8 receives pulse signals through the resistor R11. The control terminal of the switch Q8 is also grounded through the resistor R12. The first terminal of the switch Q8 is connected to the third power supply (+Vcc) through the resistor R7. The first terminal of the switch Q8 is also connected to the switch unit 312 and the isolation conduction module 33 respectively.

[0031] The control terminal of the switching transistor Q5 is connected to the control unit 311. The first terminal of the switching transistor Q5 is connected to the first power supply (+VCC1) through the resistor R8. The second terminal of the switching transistor Q5 is connected to the energy storage unit 313 and the first terminal of the switching transistor Q7 respectively. The control terminal of the switching transistor Q7 is connected to the control unit 311. The second terminal of the switching transistor Q7 is connected to the negative pressure generation module 32. The second terminal of the switching transistor Q7 is also used for grounding.

[0032] The first terminal of capacitor C1 is connected to the second terminal of switch Q5 and the first terminal of switch Q7, respectively. The second terminal of capacitor C1 is connected to the anode of diode D1, and the cathode of diode D1 is used for grounding.

[0033] Specifically, when the controller 10 outputs a pulse signal, if the pulse signal is in the first state, then the switch Q8 is turned off. When the switch Q8 is turned off, on the one hand, the third voltage of the third power supply is input to the control terminal of the switch Q5, and the switch Q5 is turned on (second operating state), while the switch Q7 is turned off. When the switch Q5 is turned on, the first voltage forms a circuit with the resistor R8, the switch Q5, the capacitor C1, and the diode D1, thereby charging the capacitor C1. On the other hand, the third voltage is input to the isolation conduction module 33, so that the isolation conduction module 33 enters the second conduction state, thereby enabling the controlled device 20 to operate normally.

[0034] If the pulse signal is in the second state, then the switch Q8 is turned on according to the pulse signal. When the switch Q8 is turned on, on the one hand, the voltage at the second terminal of the resistor R7 is pulled low, the switch Q5 is turned off, and the switch Q7 is turned on (first working state). When the switch Q7 is turned on, the capacitor C1 discharges to the negative voltage generation module 32 through the switch Q7, thereby causing the negative voltage generation module 32 to generate a negative voltage. On the other hand, when the switch Q8 is turned on, the third voltage of the third power supply is discharged through the switch Q8, thereby outputting a first control signal (low-level signal) to the isolation conduction module 33, so that the isolation conduction module 33 enters the first conduction state, thereby causing the negative voltage of the negative voltage generation module 32 to be applied to the controlled device 20 through the isolation conduction module 33, and the controlled device 20 is quickly turned off.

[0035] In some other embodiments, such as Figure 3 As shown, the negative pressure generating module 32 includes a capacitor C2 and a diode D2; The first end of the capacitor C2 is used for grounding, the second end of the capacitor C2 is connected to the isolation and conduction module 33, the second end of the capacitor C2 is also connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the energy storage unit 313.

[0036] Specifically, when the pulse signal is in the first state, switch Q8 is off and switch Q5 is on. The first voltage charges capacitor C1 through switch Q5, and the voltage at the first terminal of capacitor C1 is positive. When the pulse signal is in the second state, switch Q8 is on, switch Q5 is off, and switch Q7 is on. At this time, capacitor C1, switch Q7, capacitor C2, and diode D2 form a discharge circuit, and capacitor C1 begins to discharge. When capacitor C1 discharges, the first terminal of capacitor C2 is positive, and the voltage at the second terminal of capacitor C2 is negative. Based on this, capacitor C2 can generate a negative voltage.

[0037] In another embodiment, such as Figure 3 As shown, the isolation and conduction module 33 includes a switch Q1, a switch Q2, a resistor R1, and a resistor R2; The control terminal of the switch Q1 is connected to the energy storage control module 31 through the resistor R2. The first terminal of the switch Q1 is connected to the second power supply (+VCC2) through the resistor R1. The second terminal of the switch Q1 is connected to the controlled device 20 (Q6) and the first terminal of the switch Q2 respectively. The control terminal of the switch Q2 is connected to the resistor R2. The second terminal of the switch Q2 is connected to the negative pressure generation module 32.

[0038] Specifically, when the controller 10 outputs a pulse signal, if the pulse signal is in the first state, then the switch Q8 is turned off, and the third voltage of the third power supply is input to the control terminals of the switches Q1 and Q2 through the resistors R7 and R2. At this time, the switch Q1 is turned on, and the switch Q2 is turned off (second on state). When the switch Q1 is turned on, the second voltage is applied to the controlled device 20 through the resistor R1 and the switch Q1 to enable the controlled device 20 to operate normally.

[0039] If the pulse signal is in the second state, then the switch Q8 is turned on, and the voltage of the resistor R2 is pulled low by the switch Q8. At this time, the switch Q1 is turned off, and the switch Q2 is turned on (first conduction state). When the switch Q2 is turned on, the negative voltage generated by the negative voltage generation module 32 is applied to the controlled device 20 through the switch Q2, thereby causing the controlled device 20 to be quickly turned off, thus protecting the controlled device and improving the reliability of the energy storage system.

[0040] In yet another embodiment, such as Figure 3 As shown, the isolation and conduction module 33 also includes resistor R3, resistor R9 and diode D3; The first end of the resistor R9 is connected to the second end of the switch Q1, the second end of the resistor R9 is connected to the controlled device 20, the second end of the resistor R9 is also grounded through the resistor R3, the cathode of the diode D3 is connected to the first end of the switch Q2, and the anode of the diode D3 is connected to the controlled device 20.

[0041] Specifically, when the switching transistor Q1 is turned on and the switching transistor Q2 is turned off, the resistors R9 and R3 divide the second voltage and apply the divided voltage to the controlled device 20 to enable the controlled device 20 to start working. By dividing the second voltage using resistors R9 and R3, the voltage input to the controlled device 20 is precisely controlled to avoid damaging the controlled device 20.

[0042] When switch Q1 is off and switch Q2 is on, the potential of the anode of diode D3 will be higher than the potential of the cathode of diode D3, and diode D3 will conduct in the forward direction. At this time, the voltage of the controlled device 20 will be rapidly pulled down, thereby causing the controlled device 20 to turn off quickly. Based on this, by using a voltage divider resistor and a diode in conjunction, a stable and reliable control over the conduction and rapid turn-off of the controlled device 20 is achieved, thereby improving the reliability of the energy storage system.

[0043] This utility model provides a negative pressure shutdown circuit, which includes an energy storage control module, a negative pressure generation module, and an isolation conduction module. The energy storage control module is connected to both the negative pressure generation module and the isolation conduction module, and is also connected to a first power supply. The isolation conduction module is used to connect to a controlled device, and the control module is also used to receive pulse signals. When the pulse signal is in a first state, the energy storage control module receives a first voltage from the first power supply and starts charging based on the first voltage; and when the pulse signal is in a second state, it discharges the negative pressure generation module to drive it to generate a negative pressure, while simultaneously outputting a first control signal to control the isolation conduction module to enter a first conduction state, thereby accurately inputting the negative pressure to the controlled device. Based on this, the controlled device can be quickly shut off while saving costs, thus avoiding the possibility of the controlled device being mis-energized, and improving the reliability of the energy storage system.

[0044] 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. A negative voltage shut-off circuit, characterized in that, The negative pressure shutdown circuit includes an energy storage control module, a negative pressure generation module, and an isolation conduction module; The energy storage control module is connected to the negative pressure generation module and the isolation and conduction module respectively. The energy storage control module is also connected to the first power supply. The isolation and conduction module is also used to connect the controlled device. The energy storage control module is also used to receive pulse signals. The energy storage control module is used to receive the first voltage of the first power supply when the pulse signal is in the first state, and start charging based on the first voltage; as well as When the pulse signal is in the second state, a first control signal is output, and the negative pressure generating module is started to discharge, so that the negative pressure generating module generates negative pressure; The isolation and conduction module is used to enter a first conduction state according to the first control signal when it receives the first control signal, thereby outputting the negative pressure in the negative pressure generation module to the controlled device.

2. The negative voltage shutdown circuit according to claim 1, characterized in that, The isolation and conduction module is also used to connect to a second power source; The energy storage control module is also used to output a second control signal to the isolation conduction module when the pulse signal is in the first state; The isolation and conduction module is used to enter a second conduction state when it receives the second control signal, so as to input the second voltage of the second power supply to the controlled device, thereby controlling the controlled device to conduct.

3. The negative voltage shutdown circuit according to claim 1 or 2, characterized in that, The energy storage control module includes a control unit, a switching unit, and an energy storage unit; The control unit is connected to the switching unit and the isolation and conduction module respectively. The switching unit is also connected to the energy storage unit and the negative pressure generation module. The control unit is also used to connect to a third power source. The switching unit is also used to connect to a first power source. The control unit is also used to receive the pulse signal. The control unit is configured to output a second control signal to the isolation conduction module when the pulse signal is in the first state, and control the switching unit to enter the second operating state, thereby enabling the switching unit to transmit the first voltage; and When the pulse signal is in the second state, a first control signal is output, and the switching unit is controlled to enter the first working state; The energy storage unit is used to start charging based on the first voltage output by the switching unit when the switching unit enters the second working state. as well as When the switching unit enters the first working state, the negative pressure generating module is discharged based on the switching unit, so that the negative pressure generating module generates negative pressure.

4. The negative voltage shutdown circuit according to claim 3, characterized in that, The control unit includes a switch Q8, a resistor R7, a resistor R11, and a resistor R12; The control terminal of the switch Q8 receives pulse signals through the resistor R11. The control terminal of the switch Q8 is also grounded through the resistor R12. The first terminal of the switch Q8 is connected to the third power supply through the resistor R7. The first terminal of the switch Q8 is also connected to the switch unit and the isolation conduction module respectively.

5. The negative voltage shutdown circuit according to claim 3, characterized in that, The switching unit includes a switching transistor Q5, a switching transistor Q7, and a resistor R8; The control terminal of the switching transistor Q5 is connected to the control unit. The first terminal of the switching transistor Q5 is connected to the first power supply through the resistor R8. The second terminal of the switching transistor Q5 is connected to the energy storage unit and the first terminal of the switching transistor Q7. The control terminal of the switching transistor Q7 is connected to the control unit. The second terminal of the switching transistor Q7 is connected to the negative pressure generation module. The second terminal of the switching transistor Q7 is also used for grounding.

6. The negative voltage shutdown circuit according to claim 5, characterized in that, The energy storage unit includes a capacitor C1 and a diode D1; The first terminal of capacitor C1 is connected to the second terminal of switch Q5 and the first terminal of switch Q7, respectively. The second terminal of capacitor C1 is connected to the anode of diode D1, and the cathode of diode D1 is used for grounding.

7. The negative voltage shutdown circuit according to claim 3, characterized in that, The negative pressure generating module includes capacitor C2 and diode D2; The first end of the capacitor C2 is used for grounding, the second end of the capacitor C2 is connected to the isolation and conduction module, the second end of the capacitor C2 is also connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the energy storage unit.

8. The negative voltage shutdown circuit according to claim 2, characterized in that, The isolation and conduction module includes a switch Q1, a switch Q2, a resistor R1, and a resistor R2; The control terminal of the switch Q1 is connected to the energy storage control module through the resistor R2. The first terminal of the switch Q1 is connected to the second power supply through the resistor R1. The second terminal of the switch Q1 is connected to the controlled device and the first terminal of the switch Q2. The control terminal of the switch Q2 is connected to the resistor R2. The second terminal of the switch Q2 is connected to the negative pressure generation module.

9. The negative voltage shutdown circuit according to claim 8, characterized in that, The isolation and conduction module also includes resistor R3, resistor R9 and diode D3; The first end of the resistor R9 is connected to the second end of the switch Q1, the second end of the resistor R9 is connected to the controlled device, the second end of the resistor R9 is also grounded through the resistor R3, the cathode of the diode D3 is connected to the first end of the switch Q2, and the anode of the diode D3 is connected to the controlled device.

10. An energy storage system, characterized in that, The energy storage system includes: Controller; Controlled devices; and The negative voltage shutdown circuit as described in any one of claims 1-9.

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