A switching control circuit and an energy storage system

Abstract

This invention relates to the technical field of energy storage power supplies, and more particularly to a switch control circuit and energy storage system. The circuit includes a power supply control module, first and second detection modules and a locking module connected to the power supply control module, a drive module connected to the locking module, and a switch module connected to the drive module. The first and second detection modules and the switch module are also used to connect to a bus capacitor. When the bus voltage is greater than a first preset value, the first detection module outputs a first electrical signal. When the bus voltage reaches a higher second preset value, the second detection module outputs a second electrical signal. At this time, the drive module is turned on and the switch module is activated, and the bus voltage supplies power to the subsequent stage; simultaneously, the locking module outputs a locking signal. When the voltage is less than the second preset value, the drive module remains on due to the locking signal, keeping the switch module continuously on. When the voltage is less than the first preset value, the locking signal disappears, and the switch module is turned off. Based on this, the start-up time can be reduced and energy consumption can be decreased.

Description

Technical Field

[0001] This invention relates to the technical field of energy storage power supplies, and more particularly to a switch control circuit and an energy storage system. Background Technology

[0002] Energy storage power supplies, as popular new energy products, are widely favored by consumers. Currently, to improve auxiliary power conversion efficiency, energy storage power supplies generally adopt high-voltage BUCK circuit solutions. However, when an LLC circuit malfunctions and causes the BUS voltage to fall below the minimum voltage required for normal operation of the inverter circuit, the high-voltage BUCK circuit will continue to operate and output the voltage required by the inverter, failing to protect the inverter circuit by stopping the output. This can easily lead to abnormal operation or even damage to the inverter circuit. Furthermore, when the inverter output is turned off, safety regulations require the BUS voltage to discharge to below a specified value within 5 minutes. However, existing connection structures excessively discharge the BUS voltage to a low voltage close to where the high-voltage BUCK chip stops operating, thereby prolonging the inverter restart time and increasing battery energy consumption. Summary of the Invention

[0003] The present invention provides a switch control circuit and an energy storage system, which aims to solve the technical problems of easy damage to inverter circuits, long restart time, and high energy consumption in existing energy storage systems.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in the embodiments of the present invention is: to provide a switch control circuit, the switch control circuit including a first detection module, a second detection module, a power supply control module, a locking module, a driving module and a switch module; The power supply control module is connected to the first detection module, the second detection module, and the locking module respectively. The locking module is connected to the drive module. The drive module is connected to the second detection module and the switch module respectively. The first detection module, the second detection module, and the switch module are also used to connect to the bus capacitor. The switch module is also used to connect to the load. The first detection module is used to receive the bus voltage of the bus capacitor, and when the bus voltage is greater than a first preset value, output a first electrical signal to the power supply control module; The second detection module is used to receive the bus voltage, and when the bus voltage is greater than a second preset value, output a second electrical signal to the power supply control module and the drive module, wherein the first preset value is greater than the second preset value; The drive module is used to turn on when it receives a lock signal or the second electrical signal, so as to control the switch module to turn on; The power supply control module is used to transmit the first electrical signal to the locking module when it receives the locking signal or the second electrical signal; The locking module is used to output the locking signal to the driving module based on the first electrical signal when the driving module is turned on, and to transmit the locking signal to the power supply control module when the second detection module does not output the second electrical signal.

[0005] Optionally, the power supply control module includes a delayed power supply unit and a control unit; The delayed power supply unit is connected to the first detection module and the locking module respectively, and the delayed power supply unit is also connected to the control unit, which is connected to the second detection module; The control unit is configured to output a first control signal to the delayed power supply unit upon receiving the second electrical signal or the locking signal; and When neither the second electrical signal nor the lock signal is received, a second control signal is output to the delayed power supply unit; The delayed power supply unit is used to receive the first electrical signal, and upon receiving the first control signal, transmit the received first electrical signal to the locking module; and The transmission of the first electrical signal is stopped upon receiving the second control signal.

[0006] Optionally, the delay power supply unit includes a switching transistor Q2, a resistor R2, and a capacitor C5; The control terminal of the switch Q2 is connected to the control unit. The control terminal of the switch Q2 is also connected to the first detection module through the resistor R2. The control terminal of the switch Q2 is also grounded through the capacitor C5. The first terminal of the switch Q2 is connected to the first detection module, and the second terminal of the switch Q2 is connected to the locking module.

[0007] Optionally, the control unit includes a switch Q4, a switch Q6, a resistor R6, and a resistor R8; The control terminal of the switch Q6 is connected to the second detection module and the locking module respectively. The first terminal of the switch Q6 is connected to the first detection module through the resistor R6. The first terminal of the switch Q6 is also connected to the control terminal of the switch Q4 through the resistor R8. The first terminal of the switch Q4 is connected to the delay power supply unit. The second terminals of both the switch Q6 and the switch Q4 are used for grounding.

[0008] Optionally, the first detection module is a Zener diode DZ1; The cathode of the Zener diode DZ1 is connected to the bus capacitor, and the anode of the Zener diode DZ1 is connected to the power supply control module.

[0009] Optionally, the second detection module includes resistor R4, resistor R10, and Zener diode DZ2; The cathode of the Zener diode DZ2 is connected to the bus capacitor through the resistor R4, and the cathode of the Zener diode DZ2 is also grounded through the resistor R10. The anode of the Zener diode DZ2 is connected to the power supply control module and the drive module respectively.

[0010] Optionally, the drive module includes a switching transistor Q5 and a resistor R9; The control terminal of the switch Q5 is connected to the second detection module and the locking module. The control terminal of the switch Q5 is also grounded through the resistor R9. The first terminal of the switch Q5 is connected to the locking module and the switch module respectively, and the second terminal of the switch Q5 is used for grounding.

[0011] Optionally, the locking module includes a switch Q3, a resistor R3, and a resistor R7; The control terminal of the switch Q3 is connected to the first terminal of the switch Q5 through the resistor R7. The first terminal of the switch Q3 is connected to the power supply control module through the resistor R3. The second terminal of the switch Q3 is connected to the control terminal of the switch Q5 and the power supply control module, respectively.

[0012] Optionally, the switching module includes a switching transistor Q1, a resistor R1, and a resistor R5; The control terminal of the switch Q1 is connected to the drive module through the resistor R5. The first terminal of the switch Q1 is connected to the bus capacitor. The first terminal of the switch Q1 is also connected to the control terminal of the switch Q1 through the resistor R1. The second terminal of the switch Q1 is connected to the load.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of the present invention is to provide an energy storage system, the energy storage system comprising: Bus capacitors; and The switching control circuit described in any of the preceding items.

[0014] Unlike related technologies, this invention provides a switch control circuit and energy storage system. The circuit includes a first detection module, a second detection module, a power supply control module, a locking module, a drive module, and a switch module. The power supply control module is connected to the first detection module, the second detection module, and the locking module. The locking module is connected to the drive module. The drive module is connected to the second detection module and the switch module. The first detection module, the second detection module, and the switch module are all used to connect to a bus capacitor. The switch module is also used to connect to a load. The first detection module receives the bus voltage of the bus capacitor and outputs a first electrical signal when the bus voltage is greater than a first preset value. When the bus voltage is greater than a second preset value, it determines that the bus capacitor can normally supply power to the load. At this time, the second detection module outputs a second electrical signal based on the bus voltage and simultaneously sends the second electrical signal to both the power supply control module and the drive module. After receiving the signal, the drive module directly conducts, thereby controlling the switch module to open. The bus voltage is normally transmitted to subsequent stages, ensuring the stable operation of the subsequent circuits. Simultaneously, the locking module receives the first electrical signal output by the power supply control module and outputs a locking signal after the drive module is turned on to maintain the drive module's conduction. When the bus voltage drops below the second preset value, the second detection module stops outputting the second electrical signal. At this time, the drive module can continue to conduct using the locking signal. The power supply control module can also forward the first electrical signal output by the first detection module to the locking module. The locking module continuously outputs a locking signal based on this signal, keeping the switch module in a conducting state, thereby allowing the bus capacitor to quickly discharge the stored energy to meet safety discharge requirements. When the bus voltage further drops below the first preset value, the first detection module stops outputting the first electrical signal, the locking module stops outputting the locking signal, and the drive module and switch module are turned off, cutting off the bus voltage transmission path. Based on this, while ensuring the normal operation of the downstream circuits, excessive discharge of the bus capacitor voltage can be avoided, thereby shortening the voltage boost time during equipment restart, reducing energy consumption, and improving the reliability and stability of the energy storage system. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram illustrating an application scenario of an energy storage system provided by an embodiment of the invention; Figure 2 This is a structural block diagram of a switch control circuit provided in an embodiment of the present invention; Figure 3This is a circuit diagram of a switch control circuit provided in an embodiment of the present invention; Figure 4 This is a circuit diagram of a switch control circuit provided in another embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] It should be noted that, unless otherwise specified, the various features in the embodiments of the present invention can be combined with each other, and all are within the protection scope of the present invention. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different module division or in a different order than that shown in the device schematic diagram or the flowchart.

[0019] 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 invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0020] 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 the invention, such as... Figure 1 As shown, the 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 output voltage to the load 200 to supply power to the load 200.

[0021] Among them, such as Figure 1 As shown, the energy storage system 100 includes a power supply 10, an LLC circuit 20, a bus capacitor C6, a high-voltage BUCK circuit 30, and an inverter circuit 40. The LLC circuit 20 is connected to the power supply 10 and the bus capacitor C6, the bus capacitor C6 is connected to the high-voltage BUCK circuit 30, the high-voltage BUCK circuit 30 is also connected to the inverter circuit 40, and the inverter circuit 40 is used to connect the load 200.

[0022] In some embodiments, the energy storage system 100 further includes a controller (not shown), which is connected to the inverter circuit 40 and is used to control the operating state of the inverter circuit 40.

[0023] Specifically, when the energy storage system 100 is connected to the load 200, the energy storage system 100 needs to start supplying power to the load 200. At this time, the controller will control the inverter circuit 40 to start. After the inverter circuit 40 starts, the LLC circuit 20 will start receiving the power supply voltage output by the power supply 10, convert the power supply voltage into a preset voltage, and input it to the bus capacitor C6 to charge the bus capacitor C6. During the charging process of the bus capacitor C6, the high-voltage BUCK circuit 30 will obtain the bus voltage of the bus capacitor C6 and perform voltage reduction processing on the bus voltage, thereby outputting a voltage to the inverter circuit 40, so that the inverter circuit 40 can invert the voltage and output it to the load 200 to supply power to the load 200.

[0024] During the charging process of the LLC circuit 20 for the bus capacitor C6, if the LLC circuit 20 malfunctions, the energy stored in the bus capacitor C6 will decrease. In this case, the high-voltage BUCK circuit 30 will have insufficient input voltage, resulting in an output voltage that cannot meet the operating requirements of the inverter circuit 40, thus causing the inverter circuit 40 to malfunction. On the other hand, when the load 200 is disconnected from the inverter circuit 40, according to safety regulations, the bus voltage of the bus capacitor C6 needs to be discharged to below a preset threshold within a target time. At this time, the bus capacitor C6 will discharge based on the high-voltage BUCK circuit 30. However, when discharging the bus voltage of the bus capacitor C6 based on the high-voltage BUCK circuit 30, the bus voltage of the bus capacitor C6 may be discharged to a level far below the preset threshold. This means that when the inverter circuit 40 restarts, the bus capacitor C6 must start charging from a low voltage, increasing both the startup time and the energy consumption of the power supply 10. It should be noted that when the load 200 is disconnected from the inverter circuit 40, i.e. the inverter circuit 40 needs to be turned off, the LLC circuit should also be turned off and stop outputting.

[0025] Based on this, such as Figure 1As shown, the energy storage system 100 also includes a switch control circuit 50, which is connected to the bus capacitor C6 and the high-voltage BUCK circuit 30. The switch control circuit 50 is used to detect the bus voltage of the bus capacitor C6 in real time and activates when the bus voltage is greater than a second preset value. When the bus voltage is greater than the second preset value, it is considered that the output of the high-voltage BUCK circuit 30 meets the operating requirements of the inverter circuit 40, and the switch control circuit 50 transmits the bus voltage to the high-voltage BUCK circuit 30. After the switch control circuit 50 is activated, it also determines in real time whether the bus voltage is less than a first preset value. If the bus voltage is greater than the first preset value, it continues to transmit the bus voltage. When the bus voltage is less than the first preset value, it is considered that the bus voltage of the bus capacitor C6 has been discharged below a preset threshold. At this time, in order to reduce startup time and energy consumption, the switch control circuit 50 stops working, thereby stopping the discharge of the voltage stored in the bus capacitor C6. Based on this, the inverter circuit 40 can be ensured to work normally through the switch control circuit 50, which reduces the start-up time and energy consumption of the energy storage system while meeting the safety discharge conditions, thereby improving the reliability of the energy storage system 100.

[0026] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a switch control circuit provided in an embodiment of the present invention, such as... Figure 2 As shown, the switch control circuit 50 includes a first detection module 51, a second detection module 52, a power supply control module 53, a locking module 54, a drive module 55, and a switch module 56; The power supply control module 53 is connected to the first detection module 51, the second detection module 52 and the locking module 54 respectively. The locking module 54 is connected to the drive module 55. The drive module 55 is connected to the second detection module 52 and the switch module 56 respectively. The first detection module 51, the second detection module 52 and the switch module 56 are also used to connect the bus capacitor C6. The switch module 56 is also used to connect the load 200. The first detection module 51 is used to receive the bus voltage of the bus capacitor C6, and when the bus voltage is greater than a first preset value, output a first electrical signal to the power supply control module 53; The second detection module 52 is used to receive the bus voltage, and when the bus voltage is greater than the second preset value, output a second electrical signal to the power supply control module 53 and the drive module 55, wherein the first preset value is greater than the second preset value; The drive module 55 is used to turn on when it receives a lock signal or the second electrical signal, so as to control the switch module 56 to turn on. The power supply control module 53 is used to transmit the first electrical signal to the locking module 54 when it receives the locking signal or the second electrical signal; The locking module 54 is used to output the locking signal to the driving module 55 based on the first electrical signal when the driving module 55 is turned on, and to transmit the locking signal to the power supply control module 53 when the second detection module 52 does not output the second electrical signal.

[0027] Specifically, when the LLC circuit 20 starts working, the bus capacitor C6 begins charging, and the voltage stored in the bus capacitor C6 slowly rises. During this slow rise in the bus voltage of the bus capacitor C6, both the first detection module 51 and the second detection module 52 receive and detect the bus voltage in real time. At this time, if the bus voltage is greater than a first preset value and less than a second preset value, the first detection module 51 will output a first electrical signal to the power supply control module 53 based on the bus voltage, and the second detection module 52 will not output a second electrical signal. The power supply control module 53 will not operate, that is, it will not transmit the first electrical signal to the locking module 54. Consequently, the locking module 54 and the drive module 55 will not operate, and the switch module 56 will be in the open state. When the bus voltage gradually rises to a value greater than the second preset value, it is considered that the bus voltage of the bus capacitor C6 is sufficient to support the working requirements of the inverter circuit 40. The second detection module 52 will then output a second electrical signal to the drive module 55 and the power supply control module 53 based on the bus voltage. When the first detection module 51 outputs a first electrical signal and the second detection module 52 outputs a second electrical signal, the drive module 55 receives the second electrical signal and conducts based on the second electrical signal, thereby outputting a drive signal to the locking module 54 and the switch module 56. When the switch module 56 receives the drive signal, it conducts based on the drive signal, thereby transmitting the bus voltage of the bus capacitor C6 to the high-voltage BUCK circuit 30 so that the high-voltage BUCK circuit 30 processes the bus voltage.

[0028] On the other hand, the power supply control module 53 receives the first electrical signal and the second electrical signal. When it receives both the first and second electrical signals simultaneously, it starts working based on the second electrical signal to transmit the first electrical signal to the locking module 54. The locking module 54 turns on when it receives the drive signal, thereby outputting a locking signal based on the first electrical signal transmitted by the power supply control module 53. That is, after the drive module 55 turns on, as long as the power supply control module 53 can transmit the first electrical signal, both the drive module 55 and the locking module 54 can be in a conducting state. In addition, the second detection module 52 can also control the drive module 55 to turn on by outputting a second electrical signal. Furthermore, the locking module 54 is also connected to the power supply control module 53. At this time, the second detection module 52 outputs a second electrical signal, and the locking module 54 outputs a locking signal, so the power supply control module 53 will receive the locking signal or the second electrical signal and turn on. It should be noted that the second detection module 52 outputs a second electrical signal, while the locking module 54 outputs a locking signal. Whether the power supply control module 53 operates with the locking signal or the second electrical signal depends on the magnitude relationship between the locking signal and the second electrical signal. This can be designed independently and will not affect the implementation of the circuit function.

[0029] After the LLC circuit 20 stops working, the bus capacitor C6 stops charging. At this time, since the switching module 56 is in the on state, the bus voltage will continue to be consumed by the high-voltage BUCK circuit 30, and the voltage stored in the bus capacitor C6 will decrease. During the process of the voltage stored in the bus capacitor C6 decreasing, the first detection module 51 and the second detection module 52 will still detect the bus voltage in real time. If the bus voltage is greater than a first preset value and less than a second preset value, the first detection module 51 will continue to output a first electrical signal, while the second detection module 52 will stop outputting a second electrical signal. At this time, both the drive module 55 and the power supply control module 53 receive the locking signal output by the locking module 54. The power supply control module 53 continues to operate based on the locking signal to continuously transmit the first electrical signal. Simultaneously, the drive module 55 also maintains a conducting state based on the locking signal, thereby continuously outputting a drive signal, causing the locking module 54 to continuously output the locking signal. The switch module 56 can also maintain a conducting state based on the drive signal, thereby causing the bus capacitor C6 to continuously discharge the stored electrical energy through the switch module 56 and the high-voltage BUCK circuit 30, resulting in a decrease in the corresponding bus voltage. When the bus voltage is less than a first preset value, the first detection module 51 stops outputting the first electrical signal. When the first detection module 51 stops outputting the first electrical signal, the power supply control module 53 stops transmitting the first electrical signal, causing the locking module 54 to stop outputting the locking signal. When the locking module 54 stops outputting the locking signal, both the drive module 55 and the power supply control module 53 stop operating. When the drive module 55 stops working, the switch module 56 will also turn off, thereby stopping the transmission of the bus voltage. Based on this, while meeting safety requirements, the bus voltage of the bus capacitor C6 can be discharged to an appropriate value, thus reducing startup time and minimizing resource waste when the inverter circuit 40 restarts.

[0030] In yet another embodiment, such as Figure 2 As shown, the power supply control module 53 includes a delayed power supply unit 531 and a control unit 532; The delayed power supply unit 531 is connected to the first detection module 51 and the locking module 54 respectively. The delayed power supply unit 531 is also connected to the control unit 532. The control unit 532 is connected to the second detection module 52. The control unit 532 is configured to output a first control signal to the delayed power supply unit 531 upon receiving the second electrical signal or the locking signal; and When the second electrical signal and the lock signal are not received, a second control signal is output to the delayed power supply unit 531; The delayed power supply unit 531 is used to receive the first electrical signal, and upon receiving the first control signal, transmit the received first electrical signal to the locking module 54; and The transmission of the first electrical signal is stopped upon receiving the second control signal.

[0031] Specifically, during the charging process of the bus capacitor C6, the bus voltage of the bus capacitor C6 will slowly rise. If the bus voltage is greater than a first preset value and less than a second preset value, the first detection module 51 will output a first electrical signal to the delayed power supply unit 531 based on the bus voltage. Simultaneously, the control unit 532, not receiving the second electrical signal and the locking signal, will output a second control signal to the delayed power supply unit 531. When the delayed control unit 531 receives the second control signal, it will stop working based on the second control signal, thereby stopping the transmission of the first electrical signal to the locking module 54. When the bus voltage is greater than the second preset value, the second detection module 52 will output a second electrical signal. At this time, the control unit 532 will receive the second electrical signal and output a first control signal to the delayed power supply unit 531 based on the second electrical signal, so that the delayed power supply unit 531 starts working based on the first control signal, thereby transmitting the received first electrical signal to the locking module 54, so that the locking module 54 outputs a locking signal.

[0032] When the LLC circuit 20 stops working, the bus voltage of the bus capacitor C6 will drop. At this time, the second detection module 52 will stop outputting the second electrical signal, and the locking signal output by the locking module 54 will be transmitted to the control unit 532, so that the control unit 532 continuously outputs the first control signal to the delay power supply unit 531 based on the locking signal, thereby causing the delay power supply unit 531 to continuously transmit the first electrical signal until the bus voltage is less than the first preset value. Then, the first detection module 51 stops transmitting the first electrical signal, and the delay power supply unit 531 will also stop transmitting the first electrical signal.

[0033] In yet another embodiment, please refer to Figure 3 , Figure 3 This is a circuit diagram of a switch control circuit provided in an embodiment of the present invention, such as... Figure 3 As shown, the delayed power supply unit 531 includes a switch Q2, a resistor R2, and a capacitor C5; the control unit 532 includes a switch Q4, a switch Q6, a resistor R6, and a resistor R8. The control terminal of the switch Q2 is connected to the control unit 532. The control terminal of the switch Q2 is also connected to the first detection module 51 through the resistor R2. The control terminal of the switch Q2 is also grounded through the capacitor C5. The first end of the switch Q2 is connected to the first detection module 51, and the second end of the switch Q2 is connected to the locking module 54.

[0034] The control terminal of the switch Q6 is connected to the second detection module 52 and the locking module 54 respectively. The first terminal of the switch Q6 is connected to the first detection module 51 through the resistor R6. The first terminal of the switch Q6 is also connected to the control terminal of the switch Q4 through the resistor R8. The first terminal of the switch Q4 is connected to the delay power supply unit 531. The second terminals of both the switch Q6 and the switch Q4 are used for grounding.

[0035] Specifically, during the rise of the bus voltage, when the bus voltage is greater than a first preset value and less than a second preset value, on the one hand, the first detection module 51 outputs a first electrical signal, which is input to the capacitor C5 through the resistor R2 to charge the capacitor C5. On the other hand, since the second detection module 52 does not output a second electrical signal, the switch Q6 is turned off. When the switch Q6 is turned off, the first electrical signal is input to the control terminal of the switch Q4 through the resistors R6 and R8, and the switch Q4 is turned on. When the switch Q4 is turned on, the voltage at the control terminal of the switch Q2 is pulled low, and the switch Q2 is turned off. It should be noted that when the first detection module 51 outputs the first electrical signal and the second detection module 52 does not output the second electrical signal, during the process of the switch Q4 being turned on based on the first electrical signal, there may be a situation where the switch Q2 receives the first electrical signal through the resistor R2 and is mistakenly turned on. Therefore, by setting the capacitor C5 to delay the first electrical signal, the situation where the switch Q2 is mistakenly turned on is avoided, thereby improving the reliability of the switch control circuit.

[0036] When the second detection module 52 outputs the second electrical signal, the control terminal of the switch Q6 receives the second electrical signal and turns on based on the second electrical signal. When the switch Q6 turns on, the voltage at the control terminal of the switch Q4 is pulled low, and the switch Q4 turns off. When the switch Q4 turns off, the switch Q2 turns on, and at this time, the switch Q2 transmits the first electrical signal to the locking module 54.

[0037] After the LLC circuit 20 stops working, the bus voltage of the bus capacitor C6 will slowly decrease. When the bus voltage is less than the second preset value but greater than the first preset value, the second detection module 52 stops outputting the second electrical signal. At this time, the switch Q6 will receive the locking signal output by the locking module 54 and maintain its conducting state based on the locking signal. When the switch Q6 is continuously conducting, the switch Q4 will also be continuously turned off, thereby making the switch Q2 continuously conducting, and thus continuously transmitting the first electrical signal to the locking module 54, so that the locking module 54 continuously outputs the locking signal. When the bus voltage is less than the first preset value, the first detection module 51 will stop outputting the first electrical signal, and the switch Q2 will also stop transmitting the first electrical signal. When the locking module 54 does not receive the first electrical signal, it stops outputting a locking signal. At this time, the switch Q6 turns off because it does not receive the locking signal. After Q6 turns off, the switch Q4 turns on, pulling down the control terminal voltage of the switch Q2, causing Q2 to turn off. When the locking module 54 stops outputting the locking signal, the drive module 55 also stops working, and the switch module 56 turns off, thus stopping the discharge of the voltage stored in the bus capacitor C6. This allows the bus capacitor C6 to start charging from the first preset value when the inverter circuit 40 restarts, reducing startup time and energy consumption.

[0038] In yet another embodiment, such as Figure 3 As shown, the first detection module 51 is a Zener diode DZ1; the second detection module 52 includes resistor R4, resistor R10 and Zener diode DZ2. The cathode of the Zener diode DZ1 is connected to the bus capacitor C6, and the anode of the Zener diode DZ1 is connected to the power supply control module 53.

[0039] The cathode of the Zener diode DZ2 is connected to the bus capacitor C6 through the resistor R4, and the cathode of the Zener diode DZ2 is also grounded through the resistor R10. The anode of the Zener diode DZ2 is connected to the power supply control module 53 and the drive module 55 respectively.

[0040] Specifically, the Zener diode DZ1 receives the bus voltage of the bus capacitor C6 in real time. When the bus voltage exceeds the Zener voltage (first preset value) of the Zener diode DZ1, the Zener diode DZ1 breaks down. When the Zener diode DZ1 breaks down, it outputs a first electrical signal to the power supply control module 53. Conversely, when the bus voltage is less than the Zener voltage of the Zener diode DZ1, the Zener diode DZ1 is reverse-biased and cuts off, thus stopping the output of the first electrical signal. Simultaneously, resistors R4 and R10 also receive the bus voltage, divide it, and output the divided bus voltage to the Zener diode DZ2. When the Zener diode DZ2 receives the divided bus voltage, if the divided bus voltage is greater than the Zener diode DZ2's regulated voltage value (second preset value), the Zener diode DZ2 breaks down. At this time, the Zener diode DZ2 outputs a second electrical signal to the power supply control module 53 and the drive module 55. When the divided bus voltage is less than the Zener diode DZ2's regulated voltage value, the Zener diode DZ2 is cut off, thus stopping the output of the second electrical signal.

[0041] In some embodiments, such as Figure 3 As shown, the driving module 55 includes a switch Q5 and a resistor R9; the locking module 54 includes a switch Q3, a resistor R3 and a resistor R7. The control terminal of the switch Q5 is connected to the second detection module 52 and the locking module 54. The control terminal of the switch Q5 is also grounded through the resistor R9. The first terminal of the switch Q5 is connected to the locking module 54 and the switch module 56 respectively, and the second terminal of the switch Q5 is used for grounding.

[0042] The control terminal of the switch Q3 is connected to the first terminal of the switch Q5 through the resistor R7. The first terminal of the switch Q3 is connected to the power supply control module 53 through the resistor R3. The second terminal of the switch Q3 is connected to the control terminal of the switch Q5 and the power supply control module 53 respectively.

[0043] When the first detection module 51 outputs a first electrical signal and the second detection module 52 outputs a second electrical signal, the control terminal of the switch Q5 receives the second electrical signal and turns on based on the second electrical signal. After the switch Q5 turns on, it outputs a drive signal. At this time, the switch module 56 receives the drive signal and turns on based on the drive signal, thereby transmitting the bus voltage to the high-voltage BUCK circuit 30. On the other hand, the control terminal of the switch Q3 also receives the drive signal. At this time, the first terminal of the switch Q3 also receives the first electrical signal through the resistor R3, and the switch Q3 turns on based on the first electrical signal and the drive signal. After the switch Q3 turns on, it outputs a locking signal to the control terminal of the switch Q5, thereby locking the switch Q5 in the on state, and thus keeping the switch module 56 in the on state to continuously transmit the bus voltage.

[0044] When the switch Q3 outputs the locking signal, if the second detection module 52 stops outputting the second electrical signal, the locking signal output by the switch Q3 will be transmitted to the power supply control module 53. This allows the power supply control module 53 to continuously transmit the first electrical signal to the first terminal of the switch Q3 based on the locking signal, thereby maintaining the conduction of the switch Q3 and enabling it to continuously output the locking signal. If the switch Q3 does not receive the first electrical signal, it will turn off and stop outputting the locking signal. When the switch Q5 does not receive the locking signal, it will turn off, and the switch module 56 will also stop working, thus stopping the transmission of the bus voltage. Simultaneously, the power supply control module 53 will also stop working due to the lack of the locking signal. Based on this, the discharge of the voltage stored in the bus capacitor C6 can be stopped, allowing the circuit to meet safety regulations while reducing startup time and energy consumption.

[0045] In yet another embodiment, such as Figure 3 As shown, the switching module 56 includes a switching transistor Q1, a resistor R1, and a resistor R5; The control terminal of the switch Q1 is connected to the drive module 55 through the resistor R5. The first terminal of the switch Q1 is connected to the bus capacitor C6. The first terminal of the switch Q1 is also connected to the control terminal of the switch Q1 through the resistor R1. The second terminal of the switch Q1 is connected to the load 200.

[0046] When the drive module 55 outputs a drive signal, the switch Q1 receives the drive signal through the resistor R5 and turns on based on the drive signal. When the switch Q1 is on, the bus voltage can be output to the high-voltage BUCK circuit 30 through the switch Q1. If the drive module 55 stops outputting the drive signal, the switch Q1 turns off, thereby stopping the transmission of the bus voltage.

[0047] In some embodiments, please refer to Figure 4 , Figure 4 This is a circuit diagram of a switch control circuit provided in another embodiment of the present invention, such as... Figure 4 As shown, when the LLC circuit 20 charges the bus capacitor C6, the Zener diodes DZ1 and DZ2 will detect the bus voltage in real time. When the bus voltage is greater than a first preset value and less than a second preset value, the Zener diode DZ1 is broken down, the Zener diode DZ2 is reverse-biased and cut off, and the Zener diode DZ1 outputs a first electrical signal. At this time, the Zener diode DZ1 outputs a first electrical signal, which charges the capacitor C5 through the resistor R2; at the same time, the switch Q6 is turned off because it does not receive the second electrical signal, and the control terminal of the switch Q4 receives the first electrical signal through the resistors R6 and R8, and turns on based on the first electrical signal. When the switch Q4 is turned on, the control terminal voltage of the switch Q2 is pulled low, the switch Q2 is turned off, the switch Q2 does not transmit the first electrical signal, the switch Q3 stops working because it does not receive the first electrical signal, the switch Q5 is turned off, and the switch Q1 is also turned off, thereby stopping the transmission of the bus voltage of the bus capacitor C6.

[0048] When the bus voltage exceeds a second preset value, the Zener diode DZ2 breaks down, thereby outputting a second electrical signal to the control terminal of the switch Q6. Switch Q6 then turns on, switch Q4 turns off, and switch Q2 turns on. Once switch Q2 is on, it transmits a first electrical signal to the first terminal of switch Q3.

[0049] On the other hand, when the Zener diode ZD2 breaks down, it also transmits a second electrical signal to the control terminal of the switch Q5 to turn on the switch Q5. Once the switch Q5 is on, it outputs a drive signal. At this time, the switch Q1 receives the drive signal and turns on, thereby transmitting the bus voltage of the bus capacitor C6. Simultaneously, the control terminal of the switch Q3 receives the drive signal and turns on based on the drive signal and the first electrical signal. When the switch Q3 turns on, it outputs a lock signal. Both the control terminals of the switches Q5 and Q6 receive the lock signal and maintain their on-state based on it, thus keeping the switch Q1 continuously on and continuously transmitting the bus voltage to the load 200.

[0050] After the LLC circuit 20 stops working, the bus voltage drops. When the bus voltage is greater than a first preset value and less than a second preset value, the Zener diode DZ1 breaks down, continuously outputting the first electrical signal, while the Zener diode DZ2 is turned off, thus stopping the output of the second electrical signal. At this time, the switch Q6 remains on based on the lock signal, the switch Q4 remains off, thus making the switch Q2 continuously on, and the switch Q3 can continuously output the lock signal, thereby discharging the voltage stored in the bus capacitor C6. When the bus voltage is less than the first preset value, the Zener diode DZ1 also turns off, and the switch Q3 turns off because it does not receive the first electrical signal, thus stopping the output of the lock signal. When the switch Q3 stops outputting the lock signal, on the one hand, the switch Q5 turns off, thereby making the switch Q1 also turn off, thus stopping the transmission of the bus voltage; on the other hand, the switch Q6 turns off because it does not receive the lock signal, and the switch Q2 turns off. Based on this, the discharge of the bus voltage can be stopped when the bus voltage is lower than the first preset value, thereby improving the reliability of the circuit.

[0051] This invention provides a switch control circuit, comprising a first detection module, a second detection module, a power supply control module, a locking module, a drive module, and a switch module. The power supply control module is connected to the first detection module, the second detection module, and the locking module. The locking module is connected to the drive module. The drive module is connected to the second detection module and the switch module. The first detection module, the second detection module, and the switch module are all connected to a bus capacitor. The switch module is also connected to a load. The first detection module receives the bus voltage of the bus capacitor and outputs a first electrical signal when the bus voltage is greater than a first preset value. When the bus voltage is greater than a second preset value, it determines that the bus capacitor can normally supply power to the load. At this time, the second detection module outputs a second electrical signal based on the bus voltage and simultaneously sends the second electrical signal to both the power supply control module and the drive module. After receiving the signal, the drive module directly turns on, thereby controlling the switch module to open. The bus voltage is normally transmitted to the subsequent stage, ensuring the stable operation of the subsequent circuit. Simultaneously, the locking module receives the first electrical signal output by the power supply control module and outputs a locking signal after the drive module turns on to maintain the drive module's conduction. When the bus voltage drops below the second preset value, the second detection module stops outputting the second electrical signal. At this time, the drive module can remain on by relying on the lock signal, and the power supply control module can also forward the first electrical signal output by the first detection module to the lock module. The lock module continuously outputs a lock signal based on this signal, keeping the switch module on, thereby allowing the bus capacitor to quickly discharge the stored energy to meet safety discharge requirements. When the bus voltage drops further below the first preset value, the first detection module stops outputting the first electrical signal, the lock module stops outputting the lock signal, and the drive module and switch module are turned off, cutting off the bus voltage transmission path. Based on this, while ensuring the normal operation of the downstream circuit, the bus capacitor voltage is prevented from being excessively discharged, thereby shortening the voltage boost time when the equipment restarts, reducing energy consumption, and thus improving the reliability and stability of the energy storage system.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, 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 the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention 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 the present invention.

Claims

1. A switch control circuit, characterized in that, The switch control circuit includes a first detection module, a second detection module, a power supply control module, a locking module, a drive module, and a switch module; The power supply control module is connected to the first detection module, the second detection module, and the locking module respectively. The locking module is connected to the drive module. The drive module is connected to the second detection module and the switch module respectively. The first detection module, the second detection module, and the switch module are also used to connect to the bus capacitor. The switch module is also used to connect to the load. The first detection module is used to receive the bus voltage of the bus capacitor, and when the bus voltage is greater than a first preset value, output a first electrical signal to the power supply control module; The second detection module is used to receive the bus voltage, and when the bus voltage is greater than a second preset value, output a second electrical signal to the power supply control module and the drive module, wherein the first preset value is greater than the second preset value; The drive module is used to turn on when it receives a lock signal or the second electrical signal, so as to control the switch module to turn on; The power supply control module is used to transmit the first electrical signal to the locking module when it receives the locking signal or the second electrical signal; The locking module is used to output the locking signal to the driving module based on the first electrical signal when the driving module is turned on, and to transmit the locking signal to the power supply control module when the second detection module does not output the second electrical signal.

2. The switch control circuit according to claim 1, characterized in that, The power supply control module includes a delayed power supply unit and a control unit; The delayed power supply unit is connected to the first detection module and the locking module respectively, and the delayed power supply unit is also connected to the control unit, which is connected to the second detection module; The control unit is used to output a first control signal to the delayed power supply unit when it receives the second electrical signal or the locking signal; as well as When neither the second electrical signal nor the lock signal is received, a second control signal is output to the delayed power supply unit; The delayed power supply unit is used to receive the first electrical signal and, upon receiving the first control signal, transmit the received first electrical signal to the locking module. as well as The transmission of the first electrical signal is stopped upon receiving the second control signal.

3. The switch control circuit according to claim 2, characterized in that, The delayed power supply unit includes a switching transistor (Q2), a resistor (R2), and a capacitor (C5). The control terminal of the switch (Q2) is connected to the control unit. The control terminal of the switch (Q2) is also connected to the first detection module through the resistor (R2). The control terminal of the switch (Q2) is also grounded through the capacitor (C5). The first terminal of the switch (Q2) is connected to the first detection module, and the second terminal of the switch (Q2) is connected to the locking module.

4. The switch control circuit according to claim 2, characterized in that, The control unit includes a switch (Q4), a switch (Q6), a resistor (R6), and a resistor (R8). The control terminal of the switching transistor (Q6) is connected to the second detection module and the locking module respectively. The first terminal of the switching transistor (Q6) is connected to the first detection module through the resistor (R6). The first terminal of the switching transistor (Q6) is also connected to the control terminal of the switching transistor (Q4) through the resistor (R8). The first terminal of the switching transistor (Q4) is connected to the delay power supply unit. The second terminals of the switching transistor (Q6) and the second terminals of the switching transistor (Q4) are both used for grounding.

5. The switch control circuit according to claim 1, characterized in that, The first detection module is a Zener diode (DZ1); The cathode of the Zener diode (DZ1) is connected to the bus capacitor, and the anode of the Zener diode (DZ1) is connected to the power supply control module.

6. The switch control circuit according to claim 1, characterized in that, The second detection module includes resistor (R4), resistor (R10), and Zener diode (DZ2). The cathode of the Zener diode (DZ2) is connected to the bus capacitor through the resistor (R4), and the cathode of the Zener diode (DZ2) is also grounded through the resistor (R10). The anode of the Zener diode (DZ2) is connected to the power supply control module and the drive module respectively.

7. The switch control circuit according to any one of claims 1-6, characterized in that, The drive module includes a switching transistor (Q5) and a resistor (R9). The control terminal of the switch (Q5) is connected to the second detection module and the locking module. The control terminal of the switch (Q5) is also grounded through the resistor (R9). The first terminal of the switch (Q5) is connected to the locking module and the switch module respectively, and the second terminal of the switch (Q5) is used for grounding.

8. The switch control circuit according to claim 7, characterized in that, The locking module includes a switch (Q3), a resistor (R3), and a resistor (R7). The control terminal of the switch (Q3) is connected to the first terminal of the switch (Q5) through the resistor (R7). The first terminal of the switch (Q3) is connected to the power supply control module through the resistor (R3). The second terminal of the switch (Q3) is connected to the control terminal of the switch (Q5) and the power supply control module, respectively.

9. The switch control circuit according to claim 7, characterized in that, The switching module includes a switching transistor (Q1), a resistor (R1), and a resistor (R5). The control terminal of the switch (Q1) is connected to the drive module through the resistor (R5). The first terminal of the switch (Q1) is connected to the bus capacitor. The first terminal of the switch (Q1) is also connected to the control terminal of the switch (Q1) through the resistor (R1). The second terminal of the switch (Q1) is connected to the load.

10. An energy storage system, characterized in that, The energy storage system includes: Bus capacitors; and The switch control circuit as described in any one of claims 1-9.

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