Anti-inrush circuit and energy storage system

Abstract

The utility model discloses the technical field of energy storage power supply mainly provides a kind of anti-inversion circuit and energy storage system, the circuit includes switch control module, and the input module and protection module connected with switch control module, input module is also used to connect power supply, switch control module is also used to connect load, and protection module is also connected to the public end of switch control module and load connection.Input module is used to convert power supply voltage into target voltage according to drive signal, and target voltage is transmitted to switch control module, to make switch control module target voltage output to protection module and load, to power supply for load.And in the process of load power supply, protection module will detect the port voltage of public end in real time, and when port voltage is greater than target voltage, determine that load appears inversion.This time control switch control module is closed, to shut off the path of port voltage inversion, avoid the inversion situation when powering active load, to 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 an anti-backflow circuit and energy storage system. [Background Technology] With the rapid development of the energy storage inverter industry, users have placed higher demands on the user experience, functional reliability, and adaptability to various scenarios of energy storage products. Under normal operating conditions, when the voltage output port of an energy storage inverter is connected to a passive load (such as a resistive load or ordinary lighting equipment), electrical energy flows unidirectionally from the power supply side to the load side. However, when the user switches the voltage output port to connect to an active load (such as electronic devices with built-in power supplies or electrical devices with energy feedback functions), the system is prone to a special energy backflow phenomenon during the shutdown phase, which may even further backflow into the battery, the core energy storage unit. This backflow of voltage and accompanying reverse current into the battery can severely disrupt the battery's normal electrochemical balance. [Utility Model Content] This utility model provides an anti-backflow circuit and energy storage system, aiming to solve the technical problem in the prior art that backflow current in energy storage systems will damage circuit devices when connected to active loads, resulting in low service life, low safety and low reliability of energy storage systems.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is to provide an anti-backflow circuit, which includes an input module, a switch control module, and a protection module. The input module is connected to the switch control module, the switch control module is also connected to the protection module, the input module is also used to connect to the power supply, the switch control module is also used to connect to the load, and the protection module is also connected to the common terminal where the switch control module and the load are connected. The input module is used to receive drive signals and start working according to the drive signals to convert the power supply voltage of the power supply into a target voltage and transmit the target voltage to the switch control module; The switch control module is used to receive the target voltage and turn on based on the target voltage to output the target voltage to the protection module and the load, thereby supplying power to the load; The protection module is used to detect the port voltage of the common terminal in real time when the switch control module is turned on, and control the switch control module to turn off when the port voltage is greater than the target voltage, so as to cut off the path of the port voltage flowing back to the power supply.

[0005] Optionally, the protection module is also used to detect the port voltage of the common terminal in real time, and when the port voltage is greater than a preset voltage, output a lock signal to the input module to control the input module to stop working, thereby stopping the output of the target voltage.

[0006] Optionally, the switch control module includes a first switch unit and a first control unit; Both the first switching unit and the first control unit are connected to the input module. Both the first control unit and the first switching unit are also connected to the protection module. The first switching unit is also used to connect to the load. The first control unit is used to receive the target voltage and start working based on the target voltage, thereby transmitting the target voltage to the protection module; The first switching unit is used to receive the target voltage and turn on based on the target voltage, thereby transmitting the target voltage to the load to supply power to the load.

[0007] Optionally, the first switching unit includes a switching transistor Q12, a resistor R4, and a resistor R6; 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 second terminal of the switching transistor Q12 is also used to connect to the load. The first terminal of the switching transistor Q12 is connected to the input module. The anode of the body diode of the switching transistor Q12 is connected to the first terminal of the switching transistor Q12, and the cathode of the body diode of the switching transistor Q12 is connected to the second terminal of the switching transistor Q12.

[0008] Optionally, the first control unit includes a switching transistor Q3 and a resistor R5; The first terminal of the switch Q3 is connected to the input module, the control terminal of the switch Q3 is connected to the second terminal of the switch Q3, the second terminal of the switch Q3 is also grounded through the resistor R5, and the control terminal of the switch Q3 is also connected to the protection module.

[0009] Optionally, the protection module includes a protection unit and a locking unit; The protection unit is connected to the switch control module, and the protection unit is also connected to the common terminal where the switch control module and the load are connected. The locking unit is connected to the protection unit, and the locking unit is also connected to the input module. The protection unit is used to receive the target voltage output by the switch control module and detect the port voltage of the common terminal in real time, so as to control the switch control module to turn off when the port voltage is greater than the target voltage, thereby cutting off the path of the port voltage flowing back to the power supply. The locking unit is used to detect the port voltage of the common terminal in real time, and output a locking signal to the input module when the port voltage is greater than the preset voltage, so that the input module stops working based on the locking signal, thereby stopping the output of the target voltage.

[0010] Optionally, the protection unit includes a diode D6 and a switching transistor Q4; The control terminal of the switching transistor Q4 is connected to the first control unit, the first terminal of the switching transistor Q4 is connected to the cathode of the diode D6, the anode of the diode D6 is connected to the first switching unit and the locking unit respectively, and the second terminal of the switching transistor Q4 is connected to the first switching unit.

[0011] Optionally, the input module includes a conversion unit, a second control unit, and a second switching unit; The second control unit is connected to the second switch unit, the second switch unit is connected to the conversion unit, the conversion unit is connected to the switch control module, the second switch unit is also used to connect to the power supply, and the second control unit is also used to receive drive signals; The second control unit is used to output a control signal to the second switching unit according to the drive signal after receiving the drive signal; The second switching unit is used to receive the control signal and start working according to the control signal, thereby transmitting the power supply voltage to the conversion unit, so that the conversion unit converts the power supply voltage into a target voltage and outputs it; and The system receives the control signal and stops operating when it receives the lock signal, thereby stopping the output of the power supply voltage and causing the conversion unit to stop outputting the target voltage.

[0012] Optionally, the backflow prevention circuit includes at least two protection modules and at least two switch control modules, wherein the number of protection modules is the same as the number of switch control modules; The input module is connected to each of the switch control modules, each of the switch control modules is connected to a protection module, and each of the switch control modules is also connected to a load. 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 backflow prevention circuit described above.

[0013] Unlike related technologies, this utility model provides an anti-backflow circuit and energy storage system. The circuit includes an input module, a switch control module, and a protection module. The input module is connected to the switch control module, which is also connected to the protection module. The input module is further connected to a power supply, and the switch control module is connected to a load. The protection module is connected to the common terminal connecting the switch control module and the load. The input module receives a drive signal and starts operating according to the drive signal to convert the power supply voltage of the power supply into a target voltage and transmit the target voltage to the switch control module. The switch control module receives the target voltage and turns on based on the target voltage to output the target voltage to the protection module and the load, thereby supplying power to the load. During the process of the power supply supplying power to the load through the switch control module, the protection module continuously monitors the port voltage of the common terminal connecting the switch control module and the load to determine whether the load is experiencing backflow. When the port voltage is greater than the target voltage, the control switch control module is turned off to cut off the reverse current path of the port voltage, thereby avoiding reverse current when supplying power to the active load. This improves the service life of the power supply while supplying power to the load, and thus enhances 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.

[0015] 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 an anti-backflow circuit provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of an anti-backflow circuit provided in an embodiment of this utility model.

Detailed Implementation Methods

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] Among them, such as Figure 1 As shown, the energy storage system 100 includes a power supply 10 and an anti-backflow circuit 20. The power supply 10 is connected to the anti-backflow circuit 20, and the anti-backflow circuit 20 is connected to the load 200. The power supply 10 outputs a power voltage to the load 200 through the anti-backflow circuit 20 to supply power to the load 200. It should be noted that when the power supply 10 supplies power to the load 200, if the load 200 is an active load, there is a risk that the current from the load 200 may flow back to the power supply 10, thereby posing a risk of damaging the power supply 10 and reducing the safety and reliability of the energy storage system.

[0023] Based on this, during the process of the power supply 10 supplying power to the load 200, the anti-backflow circuit 20 receives the power supply voltage from the power supply 10, converts the power supply voltage into a target voltage, and transmits it to the load 200, thereby enabling the load 200 to operate normally. During the transmission of the target voltage, the anti-backflow circuit 20 also monitors the port voltage at the connection point with the load 200 in real time and determines whether the port voltage is greater than the target voltage. When the port voltage is greater than the target voltage, it is determined that the energy storage system 100 has a risk of backflow. At this time, the anti-backflow circuit 20 shuts off the path between the power supply 10 and the load 200 to prevent the port voltage from flowing back to the power supply 10, thereby protecting the power supply 10 and improving the safety of the energy storage system 100.

[0024] In some embodiments, the energy storage system 100 further includes a controller (not shown), which is connected to the anti-backflow circuit 20 and is used to control the operating state of the anti-backflow circuit 20.

[0025] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of an anti-backflow circuit provided in an embodiment of this utility model, as shown below. Figure 2 As shown, the anti-backflow circuit 20 includes an input module 21, a switch control module 22, and a protection module 23; The input module 21 is connected to the switch control module 22, the switch control module 22 is also connected to the protection module 23, the input module 21 is also used to connect to the power supply 10, the switch control module 22 is also used to connect to the load 200, and the protection module 23 is also connected to the common terminal where the switch control module 22 and the load 200 are connected. The input module 21 is used to receive the drive signal and start working according to the drive signal to convert the power supply voltage of the power supply 10 into the target voltage and transmit the target voltage to the switch control module 22. The switch control module 22 is used to receive the target voltage and turn on based on the target voltage to output the target voltage to the protection module 23 and the load 200, thereby supplying power to the load 200; The protection module 23 is used to detect the port voltage of the common terminal in real time when the switch control module 22 is turned on, and control the switch control module 22 to turn off when the port voltage is greater than the target voltage, so as to cut off the path of the port voltage flowing back to the power supply 200.

[0026] Specifically, after the energy storage system 100 is connected to the load 200, the input module 21 receives the drive signal and starts working according to the drive signal. When the input module 21 starts working, it receives the power supply voltage from the power supply 10, converts the power supply voltage into a target voltage, and outputs it to the switch control module 22. When the switch control module 22 receives the target voltage, it enters a conducting state based on the target voltage, thereby transmitting the target voltage to the load 200 to supply power to the load 200; simultaneously, the switch control module 22 also transmits the target voltage to the protection module 23. When the switch control module 22 outputs the target voltage, the protection module 23 also monitors the port voltage at the connection point between the switch control module 22 and the load 200 in real time and determines whether the port voltage is greater than the target voltage. If the port voltage is less than the target voltage, the protection module 23 stops working, allowing the switch control module 22 to continuously output the target voltage to the load 200, thus enabling the load 200 to continue working. If the port voltage is greater than the target voltage, it is considered that the energy storage system 100 is at risk of backflow. At this time, the protection module 23 will start working and control the switch control module 22 to stop working, thereby stopping the transmission of the power supply voltage to the load 200 and also shutting off the backflow path of the port voltage 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.

[0027] In some embodiments, such as Figure 2 As shown, the switch control module 22 includes a first switch unit 221 and a first control unit 222; The first switch unit 221 and the first control unit 222 are both connected to the input module 21. The first control unit 222 and the first switch unit 221 are also both connected to the protection module 23. The first switch unit 221 is also used to connect to the load 200. The first control unit 222 is used to receive the target voltage and start working based on the target voltage, thereby transmitting the target voltage to the protection module 23; The first switching unit 221 is used to receive the target voltage and turn on based on the target voltage, thereby transmitting the target voltage to the load 200 to supply power to the load 200.

[0028] Specifically, when the input module 21 outputs the target voltage, the first switching unit 221 receives the target voltage and turns on based on it. Once on, the first switching unit 221 transmits the target voltage to the load 200, thereby supplying power to the load 200. Simultaneously, the first control unit 222 also receives the target voltage and begins operation based on it. At this time, the first control unit 222 outputs the target voltage to the protection module 23. If the port voltage detected by the protection module 23 is less than the target voltage, the protection module 23 will stop operating based on the target voltage.

[0029] In yet another embodiment, please refer to Figure 3 , Figure 3 This is a circuit diagram of an anti-backflow circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the first switching unit 221 includes a switching transistor Q12, a resistor R4, and a resistor R6; the first control unit 222 includes a switching transistor Q3 and a 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 second terminal of the switching transistor Q12 is also used to connect the load 200. The first terminal of the switching transistor Q12 is connected to the input module 21. The anode of the body diode of the switching transistor Q12 is connected to the first terminal of the switching transistor Q12, and the cathode of the body diode of the switching transistor Q12 is connected to the second terminal of the switching transistor Q12.

[0030] The first terminal of the switch Q3 is connected to the input module 21, the control terminal of the switch Q3 is connected to the second terminal of the switch Q3, the second terminal of the switch Q3 is also grounded through the resistor R5, and the control terminal of the switch Q3 is also connected to the protection module 23.

[0031] When the input module 21 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. After 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 will also receive the target voltage and turn on based on the target voltage. When the switching transistor Q3 turns on, the protection module 23 will also receive the target voltage based on the switching transistor Q3.

[0032] In some embodiments, such as Figure 2 As shown, the protection module 23 includes a protection unit 231 and a locking unit 232; The protection unit 231 is connected to the switch control module 22, and the protection unit 231 is also connected to the common terminal where the switch control module 22 and the load 200 are connected. The locking unit 232 is connected to the protection unit 231, and the locking unit 232 is also connected to the input module 21. The protection unit 231 is used to receive the target voltage output by the switch control module 22 and detect the port voltage of the common terminal in real time, so as to control the switch control module 22 to turn off when the port voltage is greater than the target voltage, thereby cutting off the path of the port voltage flowing back to the power supply 10. The locking unit 232 is used to detect the port voltage of the common terminal in real time, and output a locking signal to the input module 21 when the port voltage is greater than the preset voltage, so that the input module 21 stops working based on the locking signal, thereby stopping the output of the target voltage.

[0033] Specifically, when the switch control module 22 starts working, it outputs the target voltage to the load 200 to supply power to the load 200. During the power supply process, to prevent backflow of voltage from the active load to the power supply 10, the protection unit 231 continuously monitors the port voltage at the connection point between the switch control module 22 and the load 200, and determines whether the port voltage is greater than the target voltage. When the port voltage is less than the target voltage, the switch control module 22 is considered to be supplying power to the load 200 normally, and the protection unit 231 stops working based on the target voltage output by the switch control module 22. If the port voltage is greater than the target voltage, a risk of backflow is considered, and the protection unit 231 controls the switch control module 22 to shut down, thereby stopping the switch control module 22 from supplying power to the load 200 and simultaneously cutting off the path of backflow of port voltage to the power supply 10. Based on this, the purpose of preventing backflow can be achieved, thereby improving the safety and reliability of the energy storage system 100.

[0034] It should be noted that after receiving the power supply voltage, the input module 21 transforms the power supply voltage to output the target voltage. However, if the input module 21 malfunctions, an abnormal path will occur, meaning it will directly output the power supply voltage to the switch control module 22. If the switch control module 22 directly outputs the power supply voltage to the load 200, it may cause overcurrent or overvoltage in the load 200, potentially damaging it. Therefore, to improve the reliability of the energy storage system 100, after the input module 21 outputs the target voltage, the locking unit 232 continuously monitors the target voltage. If the target voltage exceeds a preset voltage, it determines that the input module 21 has malfunctioned. At this point, the locking unit 232 outputs a locking signal to the input module 21, causing it to stop working, thus stopping the output of the target voltage and stopping power supply to the load 200. This avoids damage to downstream devices when the input module 21 malfunctions, thereby improving the reliability of the energy storage system 100.

[0035] It is understood 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 locking unit 232 detects that the target voltage is greater than the preset voltage, it can determine that the input module 21 has malfunctioned, thereby controlling the input module 21 to stop working, and then stopping the output to protect the downstream circuit.

[0036] In yet another embodiment, such as Figure 3 As shown, the protection unit 231 includes a diode D6 and a switching transistor Q4; The control terminal of the switching transistor Q4 is connected to the first control unit 222, the first terminal of the switching transistor Q4 is connected to the cathode of the diode D6, the anode of the diode D6 is connected to the first switching unit 221 and the locking unit 232 respectively, and the second terminal of the switching transistor Q4 is connected to the first switching unit 221.

[0037] When switch Q3 is turned on, the target voltage is input to the control terminal of switch Q4 through switch Q3. Simultaneously, the first terminal of switch Q4 receives the port voltage of the common terminal through diode D6. 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). When switch Q4 is turned on, diode D6 and switch Q4 are connected in parallel with switch Q12, its control terminal, and its second terminal. 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. Meanwhile, when the switch Q4 is turned on, the control terminal of the switch Q3 will receive the port voltage. Since the control terminal voltage of the switch Q3 is greater than the first terminal voltage of the switch Q3, the switch Q3 will also be turned off.

[0038] In another embodiment, such as Figure 3 As shown, the locking unit 232 includes a switching transistor Q10, a switching transistor Q11, a Zener diode ZD3, 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 cathode of the Zener diode ZD3 is connected to the protection unit 231. 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 input 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.

[0039] When the switch control module 22 supplies power to the load 200, the port voltage of the common terminal of the switch control module 22 and the load 200 is also input to the cathode of the Zener diode ZD3. If the port 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 switch Q11 turns on, and the switch Q10 also turns on. When both the switch Q11 and the switch Q10 are on, a lockout signal is output to the input module 21, thereby controlling the input module 21 to stop working and thus stop outputting the target voltage.

[0040] In yet another embodiment, such as Figure 2 As shown, the input module 21 includes a conversion unit 211, a second control unit 212, and a second switching unit 213; The second control unit 212 is connected to the second switch unit 213, the second switch unit 213 is connected to the conversion unit 211, the conversion unit 211 is connected to the switch control module 22, the second switch unit 213 is also used to connect to the power supply 10, and the second control unit 212 is also used to receive drive signals. The second control unit 212 is used to output a control signal to the second switching unit 213 according to the drive signal after receiving the drive signal; The second switching unit 213 is used to receive the control signal and start working according to the control signal, thereby transmitting the power supply voltage to the conversion unit 211, so that the conversion unit 211 converts the power supply voltage into a target voltage and outputs it; and The system receives the control signal and stops operating when it receives the lock signal, thereby stopping the output of the power supply voltage and causing the conversion unit 211 to stop outputting the target voltage.

[0041] Specifically, after the energy storage system 100 is connected to the load 200, the second control unit 212 receives a drive signal and starts working based on the drive signal to output a control signal to the second switching unit 213, thereby causing the second switching unit 213 to start working based on the control signal. After the second switching unit 213 starts working based on the control signal, it receives the power supply voltage from the power supply 10 and outputs the power supply voltage to the conversion unit 211, so that the conversion unit 211 converts the power supply voltage to the target voltage and outputs it to the switch control module 22. It should be noted that if the conversion unit 211 malfunctions while converting the power supply voltage, the voltage output through the switch control module 22 will be greater than the preset voltage. In this case, the locking unit 232 will output a locking signal to the second switching unit 213, and upon receiving the locking signal, the second switching unit 213 will stop working based on the locking signal, thereby stopping the output of the power supply voltage, and thus causing the conversion unit 211 to stop working. Based on this, the output can be stopped when the conversion unit 211 fails, thereby protecting the subsequent circuit and improving the reliability of the energy storage system.

[0042] In some embodiments, the controller is further configured to output a pulse signal to the conversion unit 211. When the conversion unit 211 receives the power supply voltage, it converts the power supply voltage into a target voltage based on the duty cycle of the pulse signal, and outputs the converted target voltage to the switch control module 22.

[0043] In other embodiments, such as Figure 2 As shown, the second switching unit 213 includes a switching transistor Q1, a diode D3, a Zener diode ZD1, and a resistor R3; the second control unit 212 includes a switching transistor Q5, a resistor R1, and a resistor R2. The control terminal of the switching transistor Q1 is connected to the resistor R3 and the locking unit 232 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 second control unit 212. 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 unit 211.

[0044] 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.

[0045] 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 (i.e., the control terminal of Q1 receives a control signal), thus turning on Q1. When Q1 is on, the power supply voltage can be output to the conversion unit 211 through Q1. When the Zener diode ZD3 is broken down, the switching transistor Q1 is in a continuously conducting state, thus turning off Q1 (i.e., receiving a lockout signal). When Q1 is off, the conversion unit 211 also cannot receive the power supply voltage, thus stopping the output of the target voltage. It should be noted that the Zener diode ZD1 and diode D3 are used to clamp the voltage to protect the switching transistor Q1 from damage.

[0046] In some embodiments, such as Figure 3 As shown, the conversion unit 211 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 second switch unit 213. 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 switch control module 22 through the inductor L1.

[0047] When the second switching unit 213 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 switching control module 22.

[0048] In some embodiments, the anti-backflow circuit 20 includes at least two protection modules 23 and at least two switch control modules 22, wherein the number of protection modules 23 is the same as the number of switch control modules 22; The input module 21 is connected to each of the switch control modules 22, each of the switch control modules 22 is connected to a protection module 23, and each of the switch control modules 22 is also connected to a load 200.

[0049] It should be noted that the target voltage is determined based on the rated voltage of the load 200. By converting the power supply voltage to the target voltage, the 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 units 211 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, the input module 21 will include at least two conversion units 211. The number of conversion units 211 is the same as the number of switch control modules 22. Each of the at least two conversion units 211 is connected to the second switch unit 213, and each conversion unit 211 is connected to a switch control module 22.

[0050] Each conversion unit 211 is used to receive pulse signals and the power supply voltage output by the second switching unit 213, and convert the power supply voltage into target voltages of different voltage values ​​based on the duty cycle of the pulse signals, and then output them to the corresponding switching control module 22, thereby supplying power to the corresponding load 200 based on the switching control unit 22.

[0051] In some embodiments, if the port voltage of a load 200 is greater than the corresponding target voltage, the corresponding protection module 23 will control the switch control module 22 to shut down based on the port voltage, thereby cutting off the path of port voltage flowing back to the power supply. Furthermore, since the at least two conversion units 211 are modules with a common input, when the port voltage is greater than the target voltage, this port voltage may also flow back to other conversion units 211, affecting the operating status of other modules. By shutting down the corresponding switch control module 22, the path of port voltage flowing back to other conversion units 211 can also be cut off, thereby improving the reliability and safety of the energy storage system.

[0052] In another embodiment, if a conversion unit 211 fails, the protection unit 23 outputs a locking signal to the second switching unit 213 to stop the second switching unit 213 from outputting, thereby causing at least two conversion units 211 to stop operating. It should be noted that when a conversion unit 211 fails, it may cause a surge in input current, which may flow back to other conversion units 211, affecting their operating status. Therefore, when one conversion unit fails, the second switching unit 213 is immediately controlled to stop operating, thereby preventing damage to other modules and improving the reliability of the energy storage system.

[0053] This utility model embodiment provides an anti-backflow circuit, which includes an input module, a switch control module, and a protection module. The input module is connected to the switch control module, which is also connected to the protection module. The input module is further used to connect to a power supply, and the switch control module is further used to connect to a load. The protection module is also connected to the common terminal where the switch control module and the load are connected. The input module receives a drive signal and starts working according to the drive signal to convert the power supply voltage of the power supply into a target voltage and transmit the target voltage to the switch control module. The switch control module receives the target voltage and turns on based on the target voltage to output the target voltage to the protection module and the load, thereby supplying power to the load. During the process of the power supply supplying power to the load through the switch control module, the protection module monitors the port voltage of the common terminal where the switch control module and the load are connected in real time to determine whether the load is experiencing backflow based on the port voltage. When the port voltage is greater than the target voltage, the control switch control module is turned off to cut off the reverse current path of the port voltage, thereby avoiding reverse current when supplying power to the active load. This improves the service life of the power supply while supplying power to the load, and thus enhances the reliability of the energy storage system.

[0054] 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 backflow prevention circuit, characterized in that, The backflow prevention circuit includes an input module, a switch control module, and a protection module; The input module is connected to the switch control module, the switch control module is also connected to the protection module, the input module is also used to connect to the power supply, the switch control module is also used to connect to the load, and the protection module is also connected to the common terminal where the switch control module and the load are connected. The input module is used to receive drive signals and start working according to the drive signals to convert the power supply voltage of the power supply into a target voltage and transmit the target voltage to the switch control module; The switch control module is used to receive the target voltage and turn on based on the target voltage to output the target voltage to the protection module and the load, thereby supplying power to the load; The protection module is used to detect the port voltage of the common terminal in real time when the switch control module is turned on, and control the switch control module to turn off when the port voltage is greater than the target voltage, so as to cut off the path of the port voltage flowing back to the power supply.

2. The anti-backflow circuit according to claim 1, characterized in that, The protection module is also used to detect the port voltage of the common terminal in real time, and when the port voltage is greater than the preset voltage, output a lock signal to the input module to control the input module to stop working, thereby stopping the output of the target voltage.

3. The anti-backflow circuit according to claim 2, characterized in that, The switch control module includes a first switch unit and a first control unit; Both the first switching unit and the first control unit are connected to the input module. Both the first control unit and the first switching unit are also connected to the protection module. The first switching unit is also used to connect to the load. The first control unit is used to receive the target voltage and start working based on the target voltage, thereby transmitting the target voltage to the protection module; The first switching unit is used to receive the target voltage and turn on based on the target voltage, thereby transmitting the target voltage to the load to supply power to the load.

4. The anti-backflow circuit according to claim 3, characterized in that, The first switching unit includes a switching transistor Q12, a resistor R4, and a resistor R6; 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 second terminal of the switching transistor Q12 is also used to connect to the load. The first terminal of the switching transistor Q12 is connected to the input module. The anode of the body diode of the switching transistor Q12 is connected to the first terminal of the switching transistor Q12, and the cathode of the body diode of the switching transistor Q12 is connected to the second terminal of the switching transistor Q12.

5. The anti-backflow circuit according to claim 4, characterized in that, The first control unit includes a switch Q3 and a resistor R5; The first terminal of the switch Q3 is connected to the input module, the control terminal of the switch Q3 is connected to the second terminal of the switch Q3, the second terminal of the switch Q3 is also grounded through the resistor R5, and the control terminal of the switch Q3 is also connected to the protection module.

6. The anti-backflow circuit according to claim 3, characterized in that, The protection module includes a protection unit and a locking unit; The protection unit is connected to the switch control module, and the protection unit is also connected to the common terminal where the switch control module and the load are connected. The locking unit is connected to the protection unit, and the locking unit is also connected to the input module. The protection unit is used to receive the target voltage output by the switch control module and detect the port voltage of the common terminal in real time, so as to control the switch control module to turn off when the port voltage is greater than the target voltage, thereby cutting off the path of the port voltage flowing back to the power supply. The locking unit is used to detect the port voltage of the common terminal in real time, and output a locking signal to the input module when the port voltage is greater than the preset voltage, so that the input module stops working based on the locking signal, thereby stopping the output of the target voltage.

7. The anti-backflow circuit according to claim 6, characterized in that, The protection unit includes a diode D6 and a switching transistor Q4; The control terminal of the switching transistor Q4 is connected to the first control unit, the first terminal of the switching transistor Q4 is connected to the cathode of the diode D6, the anode of the diode D6 is connected to the first switching unit and the locking unit respectively, and the second terminal of the switching transistor Q4 is connected to the first switching unit.

8. The anti-backflow circuit according to any one of claims 2-7, characterized in that, The input module includes a conversion unit, a second control unit, and a second switch unit; The second control unit is connected to the second switch unit, the second switch unit is connected to the conversion unit, the conversion unit is connected to the switch control module, the second switch unit is also used to connect to the power supply, and the second control unit is also used to receive drive signals; The second control unit is used to output a control signal to the second switching unit according to the drive signal after receiving the drive signal; The second switching unit is used to receive the control signal and start working according to the control signal, thereby transmitting the power supply voltage to the conversion unit so that the conversion unit converts the power supply voltage into the target voltage and outputs it. as well as The system receives the control signal and stops operating when it receives the lock signal, thereby stopping the output of the power supply voltage and causing the conversion unit to stop outputting the target voltage.

9. The anti-backflow circuit according to any one of claims 2-7, characterized in that, The backflow prevention circuit includes at least two protection modules and at least two switch control modules, wherein the number of protection modules is the same as the number of switch control modules; The input module is connected to each of the switch control modules, each of the switch control modules is connected to a protection module, and each of the switch control modules is also connected to a load.

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

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