A fault detection circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supply mainly provides a kind of fault detection circuit and energy storage system, the circuit includes switch module, control module, detection module and conversion module connected with switch module respectively, detection module is also connected with conversion module, switch module is also used to connect power supply, conversion module is also used to connect load.Control module is used to control switch module transmission power supply voltage to conversion module according to drive signal, to make conversion module transform power supply voltage, to output target voltage for load power supply.Detection module is used to detect target voltage in real time, and when target voltage is greater than preset voltage, it is determined that conversion module appears fault, at this moment, detection module will control switch module to shut off, to stop output power supply voltage.Based on this, it can be judged in real time whether two-way appears fault according to the output of conversion module, and immediately shut off output after determining that fault appears, to improve the security and 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 fault detection circuit and energy storage system. [Background Technology] With the rapid development of the energy storage inverter industry, users are placing increasingly stringent demands on the user experience, reliability, and safety of energy storage products. As the core energy conversion unit in an energy storage inverter, the DC-DC converter circuit plays a crucial role in converting the voltage of the power supply (such as a battery pack) into the voltage required by the load. Its operational stability directly affects the performance of the entire energy storage system.

[0003] In practical applications, DC-DC circuits are prone to damage to internal components (such as switching transistors, diodes, and capacitors) due to factors such as long-term high-load operation, instantaneous voltage surges, and component aging. When these components fail (e.g., switching transistor short-circuit or diode reverse-biased breakdown), an abnormal path is formed in the circuit, causing the input power supply voltage to directly affect the subsequent circuit or abnormal loop, resulting in risks such as overcurrent and overvoltage, and in severe cases, even causing widespread damage to subsequent components. [Utility Model Content] This utility model provides a fault detection circuit and an energy storage system, aiming to solve the technical problem of low safety in existing energy storage systems.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide a fault detection circuit, which includes a control module, a switching module, a conversion module and a detection module; The switch module is connected to the control module and the detection module respectively. The switch module is also connected to the conversion module. The detection module is also connected to the conversion module. The switch module is also used to connect to the power supply. The conversion module is also used to connect to the load. The control module is also used to receive drive signals. The control module is used to control the switch module to turn on according to the drive signal after receiving the drive signal, so that the switch module transmits the power supply voltage of the power supply to the conversion module; The conversion module is used to receive pulse signals and convert the power supply voltage based on the duty cycle of the pulse signals to output a target voltage, thereby supplying power to the load. The detection module is used to detect the target voltage output by the conversion module in real time, and when the target voltage is greater than the preset voltage, it outputs a lock signal to the switch module to control the switch module to turn off, thereby stopping the output of the power supply voltage.

[0006] Optionally, the detection module includes a detection unit and a locking unit; The detection unit is connected to the locking unit and the transformation module respectively, and the locking unit is also connected to the switch module; The detection unit is used to detect the target voltage output by the conversion module in real time, and output a control signal to the locking unit when the target voltage is greater than the preset voltage; The locking unit is used to start working according to the control signal after receiving the control signal, so as to output a locking signal to the switch module, thereby controlling the switch module to turn off.

[0007] Optionally, the detection unit includes a Zener diode ZD3, a resistor R10, and a diode D1; The anode of diode D1 is connected to the conversion module, the cathode of diode D1 is connected to the cathode of Zener diode ZD3 through resistor R10, and the anode of Zener diode ZD3 is connected to the locking unit.

[0008] Optionally, the locking unit includes a switch Q10, a switch Q11, and a resistor R11; The control terminal of the switching transistor Q11 is connected to the anode of the Zener diode ZD3 and the second terminal of the switching transistor Q10, respectively. The first terminal of the switching transistor Q11 is connected to the power supply through the resistor R11. The second terminal of the switching transistor Q11 is connected to the control module. The first terminal of the switching transistor Q11 is also connected to the control terminal of the switching transistor Q10. The first terminal of the switching transistor Q10 is connected to the power supply.

[0009] Optionally, the switching module includes a switching transistor Q1, a diode D3, a Zener diode ZD1, and a resistor R3; The control terminal of the switching transistor Q1 is connected to the resistor R3 and the detection module. The control terminal of the switching transistor Q1 is also connected to the anode of the Zener diode ZD1. The resistor R3 is connected to the control module. The cathode of the Zener diode ZD1 is connected to the cathode of the diode D3. The anode of the diode D3 is connected to the first terminal of the switching transistor Q1. The first terminal of the switching transistor Q1 is also used to connect to the power supply. The second terminal of the switching transistor Q1 is connected to the conversion module.

[0010] Optionally, the control module includes a switch Q5, a resistor R1, and a resistor R2; The control terminal of the switch Q5 receives the drive signal through the resistor R1. The control terminal of the switch Q5 is also grounded through the resistor R2. The first terminal of the switch Q5 is connected to the resistor R3, and the second terminal of the switch Q5 is used for grounding.

[0011] Optionally, the conversion module includes a switching transistor Q2, a diode D4, and an inductor L1; The control terminal of the switch Q2 is used to receive pulse signals. The first terminal of the switch Q2 is connected to the switch module. The second terminal of the switch Q2 is connected to the cathode of the diode D4. The anode of the diode D4 is used to ground. The second terminal of the switch Q2 is also connected to the load through the inductor L1.

[0012] Optionally, the fault detection circuit further includes an anti-backflow module; The anti-backflow module is connected to the transformation module and the detection module respectively, and the anti-backflow module is also used to connect to the load; The anti-backflow module is used to receive the target voltage output by the conversion module and to detect the port voltage of the load in real time. When the port voltage is less than the target voltage, the target voltage is transmitted to the load to supply power to the load. When the port voltage is greater than the target voltage, the path of the port voltage flowing back to the power supply is shut off.

[0013] Optionally, the anti-backflow module includes diode D6, switching transistor Q4, switching transistor Q12, switching transistor Q3, resistor R5, resistor R4, and resistor R6; The first terminal of the switching transistor Q3 is connected to the conversion module and the first terminal of the switching transistor Q12. The control terminal of the switching transistor Q3 is connected to the second terminal of the switching transistor Q3. The second terminal of the switching transistor Q3 is also grounded through the resistor R5. The control terminal of the switching transistor Q12 is grounded through the resistor R6. The control terminal of the switching transistor Q12 is also connected to the second terminal of the switching transistor Q12 through the resistor R4. The anode of the body diode of the switching transistor Q12 is connected to the first terminal of the switching transistor Q12. The cathode of the body diode of the switching transistor Q12 is connected to the second terminal of the switching transistor Q12. The control terminal of the switching transistor Q3 is also connected to the control terminal of the switching transistor Q4. The second terminal of the switching transistor Q12 is also connected to the load and the anode of the diode D6. The cathode of the diode D6 is connected to the first terminal of the switching transistor Q4. The second terminal of the switching transistor Q4 is also connected to the resistor R6.

[0014] 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: Power supply; and The fault detection circuit described above.

[0015] Unlike related technologies, this utility model provides a fault detection circuit and energy storage system. The circuit includes a control module, a switching module, a conversion module, and a detection module. The switching module is connected to both the control module and the detection module, and is also connected to the conversion module. The detection module is also connected to the conversion module. The switching module is used to connect to a power supply, and the conversion module is used to connect to a load. The control module is used to receive a drive signal. Upon receiving the drive signal, the control module controls the switching module to turn on, so that the switching module transmits the power supply voltage to the conversion module. The conversion module receives a pulse signal and converts the power supply voltage based on the duty cycle of the pulse signal to output a target voltage, thereby supplying power to the load. The detection module detects the target voltage output by the conversion module in real time to determine whether the conversion module has malfunctioned. If the target voltage is greater than a preset voltage, the conversion module is considered to have malfunctioned. In this case, the detection module outputs a control signal to the switching module to turn it off, thereby stopping the output of the power supply voltage. Based on this, while adapting to loads with different power supply requirements, the voltage output of the conversion module can be used to determine in real time whether the conversion module has failed, and the output can be immediately shut off after a failure is detected, thereby improving the safety and 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.

[0017] Figure 1 This is a schematic diagram of an application scenario of an energy storage system provided by an embodiment of the present invention; Figure 2 This is a structural block diagram of a fault detection circuit provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of a fault detection circuit provided in an embodiment of this utility model.

Detailed Implementation Methods

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of an energy storage system provided by an embodiment of this 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 is connected to the load 200, and the energy storage system 100 is used to supply power to the load 200 so that the load 200 can start working.

[0024] Among them, such as Figure 1 As shown, the energy storage system 100 includes a power supply 10 and a fault detection circuit 20. The power supply 10 is connected to the fault detection circuit 20, and the fault detection circuit 20 is connected to the load 200. The fault detection circuit 20 receives the power supply voltage output by the power supply 10, converts the power supply voltage into a target voltage, and outputs it to the load 200 to supply power to the load 200. It should be noted that when the fault detection circuit 20 converts the power supply voltage, if the fault detection circuit 20 malfunctions (e.g., the circuit forms an abnormal path), it may lead to the risk of overcurrent or overvoltage, thereby damaging downstream devices. Therefore, in order to improve the safety and reliability of the energy storage system, after converting the power supply voltage into the target voltage, the fault detection circuit 20 also detects the target voltage to determine whether the fault detection circuit 20 has malfunctioned based on the magnitude of the target voltage. When a fault is detected, the circuit stops working, thereby avoiding damage to downstream devices and improving the reliability of the energy storage system 100.

[0025] In some embodiments, the energy storage system 100 further includes a controller (not shown), which is connected to the fault detection circuit 20 and is used to control the operating state of the fault detection circuit 20.

[0026] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a fault detection circuit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the fault detection circuit 20 includes a control module 21, a switching module 22, a conversion module 23, and a detection module 24; The switch module 22 is connected to the control module 21 and the detection module 24 respectively. The switch module 22 is also connected to the conversion module 23. The detection module 24 is also connected to the conversion module 23. The switch module 22 is also used to connect to the power supply 10. The conversion module 23 is also used to connect to the load 200. The control module 21 is also used to receive drive signals. The control module 21 is used to control the switch module 22 to be turned on according to the drive signal after receiving the drive signal, so that the switch module 22 transmits the power supply voltage of the power supply 10 to the conversion module 23. The conversion module 23 is used to receive pulse signals and convert the power supply voltage based on the duty cycle of the pulse signals to output a target voltage, thereby supplying power to the load 200. The detection module 24 is used to detect the target voltage output by the conversion module 23 in real time, and when the target voltage is greater than the preset voltage, it outputs a lock signal to the switch module 22 to control the switch module 22 to turn off, thereby stopping the output of the power supply voltage. Specifically, when the energy storage system 100 is connected to the load 200, the control module 21 receives a drive signal and controls the switching module 22 to turn on based on the drive signal, thereby allowing the power supply voltage of the power supply 10 to be transmitted to the conversion module 23 through the switching module 22. The conversion module 23 receives a pulse signal and, upon receiving the power supply voltage, converts the power supply voltage based on the duty cycle of the pulse signal, and finally outputs the converted target voltage to the load 200 to supply power to the load 200.

[0027] During the voltage conversion process of the conversion module 23, if the conversion module 23 malfunctions, the power supply voltage will be directly output to the load 200, potentially causing overcurrent or overvoltage in the load 200 and damaging it. Therefore, to improve the reliability of the energy storage system 100, the detection module 24 continuously monitors the target voltage output by the conversion module 23 and determines whether the target voltage is greater than a preset voltage. If the target voltage is less than the preset voltage, the conversion module 23 is considered to be working normally and supplying power to the load 200. If the target voltage is greater than the preset voltage, the conversion module 23 is determined to have malfunctioned. In this case, the detection module 24 outputs a lock signal to the switch module 22 to turn it off, thereby stopping the transmission of the power supply voltage from the power source 10. When the switch module 22 stops transmitting the power supply voltage, the conversion module 23 also stops outputting the target voltage, thus stopping supplying power to the load 200. Based on this, when the conversion module 23 fails, the downstream devices can be effectively protected, thereby improving the reliability of the energy storage system 100.

[0028] It is known that the preset voltage is set based on the target voltage and the power supply voltage. By setting the preset voltage to be greater than the target voltage and less than the power supply voltage, when the detection module 24 detects that the target voltage is greater than the preset voltage, it can be determined that the conversion module 23 has malfunctioned, thereby controlling the switching module 22 to turn off, thereby stopping the output and protecting the downstream circuit.

[0029] In some other embodiments, such as Figure 2 As shown, the detection module 24 includes a detection unit 241 and a locking unit 242; The detection unit 241 is connected to the locking unit 242 and the transformation module 23 respectively, and the locking unit 242 is connected to the switch module 22; The detection unit 241 is used to detect the target voltage output by the conversion module 23 in real time, and output a control signal to the locking unit 242 when the target voltage is greater than the preset voltage. The locking unit 242 is used to start working according to the control signal after receiving the control signal, so as to output a locking signal to the switch module 22, thereby controlling the switch module 22 to turn off.

[0030] Specifically, after the conversion module 23 outputs the target voltage, the detection unit 241 will detect the target voltage in real time and determine whether the target voltage is greater than the preset voltage. If the target voltage is greater than the preset voltage, the detection unit 241 will output a control signal to the locking unit 242, so that the locking unit 242 starts working based on the control signal. After the locking unit 242 starts working, it will output a locking signal to the switching module 22, so that the switching module 22 turns off based on the locking signal, thereby stopping the output of the power supply voltage of the power supply 10.

[0031] If the target voltage is less than the preset voltage, the detection unit 241 will not output the control signal, and the locking unit 242 will not output the locking signal. In this case, the switch module 22 will transmit the power supply voltage normally based on the control module 21 being in the on state.

[0032] In some embodiments, please refer to Figure 3 , Figure 3 This is a circuit diagram of a fault detection circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the detection unit 241 includes a Zener diode ZD3, a resistor R10, and a diode D1; the locking unit 242 includes a switch Q10, a switch Q11, and a resistor R11. The anode of diode D1 is connected to the conversion module 23, the cathode of diode D1 is connected to the cathode of Zener diode ZD3 through resistor R10, and the anode of Zener diode ZD3 is connected to the locking unit 242.

[0033] The control terminal of the switching transistor Q11 is connected to the anode of the Zener diode ZD3 and the second terminal of the switching transistor Q10, respectively. The first terminal of the switching transistor Q11 is connected to the power supply 10 through the resistor R11. The second terminal of the switching transistor Q11 is connected to the control module 21. The first terminal of the switching transistor Q11 is also connected to the control terminal of the switching transistor Q10. The first terminal of the switching transistor Q10 is connected to the power supply 10.

[0034] Specifically, when the conversion module 23 outputs the target voltage, the target voltage is also input to the cathode of the Zener diode ZD3 through the diode D1. If the target voltage is greater than the Zener voltage of the Zener diode ZD3, the Zener diode ZD3 will break down. When the Zener diode ZD3 breaks down, the switching transistor Q11 turns on, and the switching transistor Q10 also turns on. When both switching transistors Q11 and Q10 are on, a lockout signal is output to the switching module 22, thereby controlling the switching module 22 to turn off, stopping the transmission of the power supply voltage, and thus causing the conversion module 23 to stop outputting the target voltage. Based on this, when the conversion module 23 fails, it can be controlled to stop outputting, thereby protecting downstream devices and improving the reliability of the energy storage system.

[0035] In some other embodiments, such as Figure 3 As shown, the control module 21 includes a switch Q5, a resistor R1, and a resistor R2; the switching module 22 includes a switch Q1, a diode D3, a Zener diode ZD1, and a resistor R3. The control terminal of the switch Q5 receives the drive signal through the resistor R1. The control terminal of the switch Q5 is also grounded through the resistor R2. The first terminal of the switch Q5 is connected to the resistor R3, and the second terminal of the switch Q5 is used for grounding.

[0036] The control terminal of the switching transistor Q1 is connected to the resistor R3 and the detection module 24 respectively. The control terminal of the switching transistor Q1 is also connected to the anode of the Zener diode ZD1. The resistor R3 is connected to the control module 21. The cathode of the Zener diode ZD1 is connected to the cathode of the diode D3. The anode of the diode D3 is connected to the first terminal of the switching transistor Q1. The first terminal of the switching transistor Q1 is also used to connect to the power supply 10. The second terminal of the switching transistor Q1 is connected to the conversion module 23.

[0037] Specifically, when the switching transistor Q5 receives the drive signal through the resistor R1, it will turn on based on the drive signal. When Q5 is on, the control terminal voltage of the switching transistor Q1 is pulled low by the resistor R3, thus turning on Q1. When Q1 is on, the power supply voltage can be output to the conversion module 23 through Q1, allowing the conversion module 23 to output a target voltage to the load 200 to power it. When the Zener diode ZD3 breaks down (i.e., the target voltage output by the conversion module 23 is greater than the preset voltage), the switching transistor Q11 remains continuously on, thus keeping it off (i.e., receiving a lockout signal). When Q1 is off, the conversion module 23 also loses the power supply voltage and stops operating, thereby protecting downstream devices. It should be noted that the Zener diode ZD1 and diode D3 are used to clamp the voltage of the switching transistor Q1 to protect it from damage.

[0038] In other embodiments, such as Figure 3 As shown, the conversion module 23 includes a switching transistor Q2, a diode D4, and an inductor L1; The control terminal of the switch Q2 is used to receive pulse signals. The first terminal of the switch Q2 is connected to the switch module 22. The second terminal of the switch Q2 is connected to the cathode of the diode D4. The anode of the diode D4 is used to ground. The second terminal of the switch Q2 is also connected to the load 200 through the inductor L1.

[0039] Specifically, when the switching module 22 outputs a power supply voltage, the switching transistor Q2 receives the power supply voltage and periodically turns on and off based on the duty cycle of the pulse signal, thereby controlling the energy stored in the inductor L1 and outputting the target voltage to the load 200 to power the load 200. When the switching module 22 stops outputting the power supply voltage, there will be no voltage input to the inductor L1, thus stopping the output of the target voltage and protecting the downstream devices.

[0040] In some embodiments, it should be noted that when the conversion unit 23 outputs a target voltage to power the load 200, if the load 200 is an active load, the voltage of the load 200 may flow back to the power supply 10 through the conversion module 23, thereby damaging the power supply 10 and reducing the safety and reliability of the energy storage system. Based on this, as Figure 2 As shown, the fault detection circuit 20 also includes an anti-backflow module 25; The anti-backflow module 25 is connected to the conversion module 23 and the detection module 24 respectively, and the anti-backflow module 25 is also used to connect to the load 200; The anti-backflow module 25 is used to receive the target voltage output by the conversion module 23 and to detect the port voltage of the load 200 in real time, so that when the port voltage is less than the target voltage, the target voltage is transmitted to the load 200 to power the load 200; and The system stops operating when the port voltage exceeds the target voltage, thereby shutting off the path of the port voltage flowing back to the power supply 10.

[0041] Specifically, when the conversion module 23 outputs the target voltage, the anti-backflow module 25 receives the target voltage and simultaneously detects the port voltage at the connection point with the load 200. If the target voltage is greater than the port voltage, the anti-backflow module 25 transmits the target voltage to the load 200 to supply power to the load 200. If the target voltage is less than the port voltage, it is considered that the energy storage system 100 is at risk of backflow. In this case, the anti-backflow module 25 stops transmitting the target voltage and shuts off the path of the port voltage flowing back to the power supply 10, thereby avoiding the risk of backflow in the energy storage system 100 and thus improving the service life of the power supply 10.

[0042] In yet another embodiment, such as Figure 3 As shown, the anti-backflow module includes diode D6, switching transistor Q4, switching transistor Q12, switching transistor Q3, resistor R5, resistor R4, and resistor R6. The first terminal of the switching transistor Q3 is connected to the first terminal of the conversion module 23 and the first terminal of the switching transistor Q12. The control terminal of the switching transistor Q3 is connected to the second terminal of the switching transistor Q3. The second terminal of the switching transistor Q3 is also grounded through the resistor R5. The control terminal of the switching transistor Q12 is grounded through the resistor R6. The control terminal of the switching transistor Q12 is also connected to the second terminal of the switching transistor Q12 through the resistor R4. The anode of the body diode of the switching transistor Q12 is connected to the first terminal of the switching transistor Q12. The cathode of the body diode of the switching transistor Q12 is connected to the second terminal of the switching transistor Q12. The control terminal of the switching transistor Q3 is also connected to the control terminal of the switching transistor Q4. The second terminal of the switching transistor Q12 is also connected to the load 200 and the anode of the diode D6. The cathode of the diode D6 is connected to the first terminal of the switching transistor Q4. The second terminal of the switching transistor Q4 is also connected to the resistor R6.

[0043] Specifically, when the conversion module 23 outputs the target voltage, the target voltage is input to the ground terminal through the body diode of the switching transistor Q12, resistor R4, and resistor R6. At this time, a corresponding voltage drop will be generated across resistor R4. When the voltage drop across resistor R4 is greater than the on-state voltage drop of the switching transistor Q12, the switching transistor Q12 turns on. When the switching transistor Q12 turns on, the target voltage is output to the load 200 through the switching transistor Q12, thereby enabling the load 200 to operate normally. At the same time, the switching transistor Q3 also receives the target voltage and turns on based on the target voltage. When the switching transistor Q3 turns on, the target voltage is input to the control terminal of the switching transistor Q4 through the switching transistor Q3. Simultaneously, the first terminal of the switching transistor Q4 receives the port voltage of the common terminal through diode D6. At this time, if the port voltage is less than the target voltage, the target voltage output by the conversion module 23 will continuously supply power to the load 200 through the switching transistor Q12. When the port voltage is greater than the target voltage (i.e., the difference between the port voltage and the target voltage is greater than the on-state voltage drop of switch Q4), switch Q4 is turned on (at this time, the port voltage is input to the ground terminal through diode D6, switch Q4, and resistor R5). After switch Q4 is turned on, diode D6 and switch Q4 are connected in parallel with switch Q12, its control terminal, and the second terminal of switch Q12. Since the voltage drop of switch Q4 and diode D6 is insufficient to support the conduction of switch Q12, switch Q12 is turned off, thus stopping the transmission of the target voltage. Simultaneously, when switch Q4 is turned on, the control terminal of switch Q3 receives the port voltage. Since the control terminal voltage of switch Q3 is greater than the first terminal voltage of switch Q3, switch Q3 is also turned off. Based on this, voltage backflow to the power supply 10 can be avoided, thereby improving the safety and reliability of the energy storage system.

[0044] In some embodiments, the fault detection circuit 20 includes at least two anti-backflow modules 25 and at least two conversion modules 23, wherein the number of anti-backflow modules 25 is the same as the number of conversion modules 23; The switch module 22 is connected to each of the transformation modules 23, each of the transformation modules 23 is connected to an anti-backflow module 25, and each anti-backflow module 25 is also connected to a load 200.

[0045] It should be noted that the target voltage is determined based on the rated voltage of load 200. By converting the power supply voltage to the target voltage, load 200 operates in its optimal state. However, with the continuous development of energy storage systems, the same energy storage system may connect to different loads. Due to the different rated voltages of these loads, different conversion modules 23 are needed to convert the power supply voltage based on the rated voltage of each load, thereby outputting different target voltage values. Therefore, when power needs to be supplied to at least two loads 200, at least two conversion modules 23 are required to convert the voltage of the power supply 10 and output it to the corresponding load 200 through the anti-backflow module 25, thus providing different supply voltages to different loads 200.

[0046] In some embodiments, if a conversion module 23 malfunctions, the detection module 24 outputs a locking signal to the switching module 22 to stop the switching module 22 from outputting, thereby causing at least two conversion modules 23 to stop operating. It should be noted that when a conversion module 23 malfunctions, it may cause a surge in input current, which may flow back to other conversion modules 23, affecting their operating status. Therefore, when one conversion module malfunctions, the switching module 22 is immediately controlled to stop operating, thus preventing damage to other modules and improving the reliability of the energy storage system.

[0047] In another embodiment, if the port voltage of a certain load 200 is greater than the corresponding target voltage, the corresponding backflow prevention module 25 will shut off the path of the port voltage flowing back to the power supply 10. Furthermore, since the at least two conversion modules 23 share a common input, when the port voltage is greater than the target voltage, this port voltage may also flow back to other conversion modules 23, affecting their operation. By stopping operation, the path of the port voltage flowing back to other conversion modules 23 can be shut off, thereby improving the reliability and safety of the energy storage system.

[0048] This utility model embodiment provides a fault detection circuit, which includes a control module, a switching module, a conversion module, and a detection module. The switching module is connected to the control module and the detection module, and is also connected to the conversion module. The detection module is also connected to the conversion module. The switching module is used to connect to a power supply, and the conversion module is used to connect to a load. The control module is used to receive a drive signal. Upon receiving the drive signal, the control module controls the switching module to turn on, so that the switching module transmits the power supply voltage to the conversion module. The conversion module receives a pulse signal and converts the power supply voltage based on the duty cycle of the pulse signal to output a target voltage, thereby supplying power to the load. The detection module detects the target voltage output by the conversion module in real time to determine whether the conversion module has malfunctioned. If the target voltage is greater than a preset voltage, the conversion module is considered to have malfunctioned. In this case, the detection module outputs a control signal to the switching module to control the switching module to turn off, thereby stopping the output of the power supply voltage. Based on this, while adapting to loads with different power supply requirements, the voltage output of the conversion module can be used to determine in real time whether the conversion module has failed, and the output can be immediately shut off after a failure is detected, thereby improving the safety and reliability of the energy storage system.

[0049] 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, which are not provided in detail for the sake of brevity; 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 fault detection circuit, characterized in that, The fault detection circuit includes a control module, a switching module, a conversion module, and a detection module; The switch module is connected to the control module and the detection module respectively. The switch module is also connected to the conversion module. The detection module is also connected to the conversion module. The switch module is also used to connect to the power supply. The conversion module is also used to connect to the load. The control module is also used to receive drive signals. The control module is used to control the switch module to turn on according to the drive signal after receiving the drive signal, so that the switch module transmits the power supply voltage of the power supply to the conversion module; The conversion module is used to receive pulse signals and convert the power supply voltage based on the duty cycle of the pulse signals to output a target voltage, thereby supplying power to the load. The detection module is used to detect the target voltage output by the conversion module in real time, and when the target voltage is greater than the preset voltage, it outputs a lock signal to the switch module to control the switch module to turn off, thereby stopping the output of the power supply voltage.

2. The fault detection circuit according to claim 1, characterized in that, The detection module includes a detection unit and a locking unit; The detection unit is connected to the locking unit and the transformation module respectively, and the locking unit is also connected to the switch module; The detection unit is used to detect the target voltage output by the conversion module in real time, and output a control signal to the locking unit when the target voltage is greater than the preset voltage; The locking unit is used to start working according to the control signal after receiving the control signal, so as to output a locking signal to the switch module, thereby controlling the switch module to turn off.

3. The fault detection circuit according to claim 2, characterized in that, The detection unit includes a Zener diode ZD3, a resistor R10, and a diode D1; The anode of diode D1 is connected to the conversion module, the cathode of diode D1 is connected to the cathode of Zener diode ZD3 through resistor R10, and the anode of Zener diode ZD3 is connected to the locking unit.

4. The fault detection circuit according to claim 3, characterized in that, The locking unit includes a switch Q10, a switch Q11, and a resistor R11; The control terminal of the switching transistor Q11 is connected to the anode of the Zener diode ZD3 and the second terminal of the switching transistor Q10, respectively. The first terminal of the switching transistor Q11 is connected to the power supply through the resistor R11. The second terminal of the switching transistor Q11 is connected to the control module. The first terminal of the switching transistor Q11 is also connected to the control terminal of the switching transistor Q10. The first terminal of the switching transistor Q10 is connected to the power supply.

5. The fault detection circuit according to claim 1, characterized in that, The switching module includes a switching transistor Q1, a diode D3, a Zener diode ZD1, and a resistor R3; The control terminal of the switching transistor Q1 is connected to the resistor R3 and the detection module. The control terminal of the switching transistor Q1 is also connected to the anode of the Zener diode ZD1. The resistor R3 is connected to the control module. The cathode of the Zener diode ZD1 is connected to the cathode of the diode D3. The anode of the diode D3 is connected to the first terminal of the switching transistor Q1. The first terminal of the switching transistor Q1 is also used to connect to the power supply. The second terminal of the switching transistor Q1 is connected to the conversion module.

6. The fault detection circuit according to claim 5, characterized in that, The control module includes a switch Q5, a resistor R1, and a resistor R2; The control terminal of the switch Q5 receives the drive signal through the resistor R1. The control terminal of the switch Q5 is also grounded through the resistor R2. The first terminal of the switch Q5 is connected to the resistor R3, and the second terminal of the switch Q5 is used for grounding.

7. The fault detection circuit according to claim 1, characterized in that, The conversion module includes a switching transistor Q2, a diode D4, and an inductor L1; The control terminal of the switch Q2 is used to receive pulse signals. The first terminal of the switch Q2 is connected to the switch module. The second terminal of the switch Q2 is connected to the cathode of the diode D4. The anode of the diode D4 is used to ground. The second terminal of the switch Q2 is also connected to the load through the inductor L1.

8. The fault detection circuit according to any one of claims 1-7, characterized in that, The fault detection circuit also includes an anti-backflow module; The anti-backflow module is connected to the transformation module and the detection module respectively, and the anti-backflow module is also used to connect to the load; The backflow prevention module is used to receive the target voltage output by the conversion module and detect the port voltage of the load in real time, so that when the port voltage is less than the target voltage, the target voltage is transmitted to the load to supply power to the load; as well as When the port voltage is greater than the target voltage, the path of the port voltage flowing back to the power supply is shut off.

9. The fault detection circuit according to claim 8, characterized in that, The anti-backflow module includes diode D6, switching transistor Q4, switching transistor Q12, switching transistor Q3, resistor R5, resistor R4, and resistor R6; The first terminal of the switching transistor Q3 is connected to the conversion module and the first terminal of the switching transistor Q12. The control terminal of the switching transistor Q3 is connected to the second terminal of the switching transistor Q3. The second terminal of the switching transistor Q3 is also grounded through the resistor R5. The control terminal of the switching transistor Q12 is grounded through the resistor R6. The control terminal of the switching transistor Q12 is also connected to the second terminal of the switching transistor Q12 through the resistor R4. The anode of the body diode of the switching transistor Q12 is connected to the first terminal of the switching transistor Q12. The cathode of the body diode of the switching transistor Q12 is connected to the second terminal of the switching transistor Q12. The control terminal of the switching transistor Q3 is also connected to the control terminal of the switching transistor Q4. The second terminal of the switching transistor Q12 is also connected to the load and the anode of the diode D6. The cathode of the diode D6 is connected to the first terminal of the switching transistor Q4. The second terminal of the switching transistor Q4 is also connected to the resistor R6.

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

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