An input control circuit and energy storage system

Abstract

The present application relates to the technical field of energy storage power supply, and mainly provides an input control circuit and an energy storage system, which comprises a first detection module, a second detection module and a locking module connected with the first detection module, a switch module connected with the locking module, and the second detection module connected with the locking module. When the bus voltage detected by the first detection module is greater than a first preset value, a first control signal is output, and when the bus voltage is higher than a second preset value with a larger value, a second control signal is output. The locking module controls the switch module to be turned on only when two control signals are received at the same time, preventing the inverter circuit from working abnormally. If there is no second control signal after the locking module works, the switch module is maintained to be turned on according to the first control signal to discharge the bus capacitor; when the first control signal is not received, the locking module turns off the switch module to stop the bus voltage transmission, thereby avoiding excessive discharge of the bus voltage, shortening the inverter restart time and reducing the battery energy consumption.

Description

Technical Field

[0001] This invention relates to the technical field of energy storage power supplies, and more particularly to an input 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 an input control circuit and an energy storage system, aiming to solve the technical problems of inverter circuits in existing energy storage systems not working properly, high time costs, and high energy consumption.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in the embodiments of the present invention is: providing an input control circuit applied to an energy storage system, the energy storage system including an LLC circuit and a bus capacitor, the LLC circuit being connected to the bus capacitor, the bus capacitor being configured to charge based on the output voltage of the LLC circuit when the LLC circuit is working, and to stop charging when the LLC circuit stops working; the input control circuit includes a first detection module, a second detection module, a locking module, and a switching module; The first detection module is connected to the second detection module and the locking module respectively. The second detection module is connected to the locking module. The locking module is also connected to the switch module. The first detection module and the switch module are also used to connect the bus capacitor. The switch module is also used to connect the high-voltage BUCK circuit. The first detection module is used to detect the bus voltage of the bus capacitor in real time, and output a first control signal when the voltage of the bus capacitor is greater than a first preset value; The second detection module is used to receive the bus voltage and output a second control signal to the locking module when the bus voltage is greater than a second preset value; And when the bus voltage is less than a second preset value, the output of the second control signal is stopped, wherein the second preset value is greater than the first preset value; The locking module is configured to start operating upon receiving the first control signal and the second control signal, controlling the switching module to conduct so that the switching module transmits the bus voltage to the high-voltage BUCK circuit; and After starting operation according to the first control signal and the second control signal, the operation state is maintained based on the first control signal to keep the switch module on, thereby enabling the switch module to continuously transmit the bus voltage; and when the first control signal is not received, the switch module is controlled to disconnect to stop transmitting the bus voltage.

[0005] 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 second detection module and the locking module respectively.

[0006] Optionally, the second detection module includes resistors R5 and R6 and a Zener diode DZ2; The cathode of the Zener diode DZ2 is connected to the first detection module through the resistor R5, and the cathode of the Zener diode DZ2 is also grounded through the resistor R6. The anode of the Zener diode DZ2 is connected to the locking module.

[0007] Optionally, the switching module includes a switching transistor Q1 and a resistor R1; The control terminal of the switch Q1 is connected to the locking module. 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 high-voltage BUCK circuit.

[0008] Optionally, the locking module includes a locking unit and a control unit; The locking unit is connected to the first detection module and the control unit respectively, and the control unit is also connected to the second detection module and the switch module respectively; The control unit is used to receive the second control signal and start working when the second control signal is received, so as to output a drive signal to the locking unit and control the switch module to be turned on based on the drive signal; The locking unit is used to receive the first control signal, and when it receives the drive signal, it starts to work based on the first control signal and the drive signal, thereby outputting a locking signal to the control unit so that the control unit maintains its working state based on the locking signal.

[0009] Optionally, the control unit includes a switching transistor Q3, a resistor R2, and a resistor R7; The control terminal of the switch Q3 is connected to the second detection module and the locking unit respectively. The control terminal of the switch Q3 is also grounded through the resistor R7. The first terminal of the switch Q3 is connected to the locking unit. The first terminal of the switch Q3 is also connected to the switch module through the resistor R2. The second terminal of the switch Q3 is used for grounding.

[0010] Optionally, the locking unit includes a switch Q2, a resistor R3, and a resistor R4; The control terminal of the switch Q2 is connected to the control unit through the resistor R4, the first terminal of the switch Q2 is connected to the first detection module through the resistor R3, and the second terminal of the switch Q2 is connected to the control unit.

[0011] Optionally, the input control circuit may further include a protection module; The protection module is connected to the first detection module and the locking module respectively, and the protection module is also used to connect to the high-voltage BUCK circuit; The protection module is used to receive the bus voltage and the output voltage of the high-voltage BUCK circuit, and when the bus voltage is greater than a third preset value or the output voltage is greater than a target voltage value, it outputs a shutdown signal to the locking module to make the locking module stop working, thereby turning off the switch module, wherein the third preset value is greater than the second preset value.

[0012] Optionally, the protection module includes a switch Q7, a resistor R15, a Zener diode DZ5, and a Zener diode DZ6; The control terminal of the switching transistor Q7 is connected to the cathodes of the Zener diodes DZ5 and DZ6 respectively through the resistor R15. The first terminal of the switching transistor Q7 is connected to the locking module, and the second terminal of the switching transistor Q7 is grounded. The cathode of the Zener diode DZ5 is connected to the first detection module, and the cathode of the Zener diode DZ6 is connected to the high-voltage BUCK circuit.

[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: Power supply, LLC circuit, bus capacitor, high voltage BUCK circuit, inverter circuit, and input control circuit as described above; The LLC circuit is connected to the power supply and the bus capacitor respectively. The bus capacitor is also connected to the input control circuit, which is connected to the inverter circuit through the high-voltage BUCK circuit.

[0014] Unlike related technologies, this invention provides an input control circuit and an energy storage system. The input control circuit includes a first detection module, a second detection module, a locking module, and a switching module. The first detection module is connected to both the second detection module and the locking module. The second detection module is connected to the locking module, and the locking module is also connected to the switching module. Both the first detection module and the switching module are used to connect to a bus capacitor. The first detection module detects the bus voltage of the bus capacitor and outputs a first control signal when the bus voltage is greater than a first preset value. The second detection module receives the bus voltage and outputs a second control signal to the locking module when the bus voltage is greater than a second preset value, wherein the second preset value is greater than the first preset value. The locking module only controls the switching module to conduct to transmit the bus voltage when it simultaneously receives the first and second control signals. This prevents the inverter circuit from malfunctioning due to the switching module's conduction when the bus voltage does not meet the normal operating requirements, thus improving the safety of the energy storage system. After startup, if the locking module does not receive the second control signal, it assumes the bus voltage cannot support the inverter circuit's operation. In this case, the locking module responds to the first control signal to keep the switching module on, thereby releasing the energy stored in the bus capacitor. When the locking module does not receive the first control signal, it stops operating, causing the switching module to turn off and stopping the transmission of bus voltage. This prevents excessive discharge of the bus capacitor, which could lead to excessively long startup times during inverter restart, and also reduces battery energy consumption, improving the reliability 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 the input control circuit provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of an input control circuit provided in an embodiment of the present invention; Figure 4 This is a circuit diagram of an input 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 an input control circuit 50, which is connected to the bus capacitor C6 and the high-voltage BUCK circuit 30. The input 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 input control circuit 50 transmits the bus voltage to the high-voltage BUCK circuit 30. After the input 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 input control circuit 50 stops working, thereby stopping the discharge of the voltage stored in the bus capacitor C6. Based on this, the input control circuit 50 can ensure that the inverter circuit 40 can work normally, while meeting the safety discharge conditions, reducing the start-up time and energy consumption of the energy storage system, 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 an input control circuit provided in an embodiment of the present invention, such as... Figure 2 As shown, the input control circuit 50 includes a first detection module 51, a second detection module 52, a locking module 53, and a switch module 54; The first detection module 51 is connected to the second detection module 52 and the locking module 53 respectively. The second detection module 52 is connected to the locking module 53. The locking module 53 is also connected to the switch module 54. The first detection module 51 and the switch module 54 are also used to connect the bus capacitor C6. The switch module 54 is also used to connect the high voltage BUCK circuit 30. The first detection module 51 is used to detect the bus voltage of the bus capacitor C6 in real time, and output a first control signal when the voltage of the bus capacitor C6 is greater than a first preset value; The second detection module 52 is used to receive the bus voltage and output a second control signal to the locking module 53 when the bus voltage is greater than a second preset value; And when the bus voltage is less than a second preset value, the output of the second control signal is stopped, wherein the second preset value is greater than the first preset value; The locking module 53 is configured to start operating upon receiving the first control signal and the second control signal, controlling the switching module 54 to conduct, so that the switching module 54 transmits the bus voltage to the high-voltage BUCK circuit 30; and After starting operation according to the first control signal and the second control signal, the operation state is maintained based on the first control signal to keep the switch module 54 on, thereby enabling the switch module 54 to continuously transmit the bus voltage; and when the first control signal is not received, the switch module 54 is controlled to disconnect to stop transmitting the bus voltage.

[0027] It should be noted that the locking module 53 is designed to start operating upon receiving both the first control signal and the second control signal. Specifically, the locking module 53 requires both the first and second control signals to be received simultaneously for the initial activation of the switch module 54. However, after the switch module 54 is activated, only the first control signal is needed to maintain its activation. In other words, the first and second control signals are the activation conditions for the locking module 53, while the first control signal is the condition for maintaining the switch module 54's activation after the locking module 53 has been activated.

[0028] Specifically, when the LLC circuit 20 starts working, the bus capacitor C6 begins charging, and the voltage stored in the bus capacitor C6 rises. At this time, the first detection module 51 will detect the bus voltage of the bus capacitor C6 in real time, and when the bus voltage is greater than a first preset value and less than a second preset value, it will output a first control signal to the locking module 53. When the bus voltage is greater than the first preset value and less than the second preset value, the first detection module 51 will also output the bus voltage. If the bus voltage of the bus capacitor C6 is less than the first preset value, the first detection module 51 will stop outputting the first control signal and stop transmitting the bus voltage. After the first detection module 51 transmits the bus voltage, the second detection module 52 will receive the bus voltage and determine whether the bus voltage is greater than the second preset value. If the bus voltage is 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. At this time, the second detection module 52 will output a second control signal to the locking module 53. When the locking module 53 receives both the second control signal and the first control signal simultaneously, it will begin operation based on both signals. Once operational, the locking module 53 will output a drive signal to the switching module 54, causing the switching module 54 to conduct. This transmits the bus voltage to the high-voltage BUCK circuit 30, allowing the high-voltage BUCK circuit 30 to process the bus voltage. This ensures that the voltage output by the high-voltage BUCK circuit 30 meets the operational requirements of the inverter circuit 40.

[0029] After the LLC circuit 20 stops working, the bus capacitor C6 stops charging. At this time, since the switch module 54 is in the conducting state, the electrical energy stored in the bus capacitor C6 will be continuously consumed by the high-voltage BUCK circuit 30, and the bus voltage (i.e., the voltage across the bus capacitor C6) will decrease. During the process of the bus voltage 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 continuously output a first control signal, while the second detection module 52 will stop outputting a second control signal. At this time, the locking module 53 only receives the first control signal, but the locking module 53 will maintain its working state based on the received first control signal, thereby maintaining the conduction of the switch module 54, so that the bus capacitor C6 continues to discharge the stored voltage through the high-voltage BUCK circuit 30. When the bus voltage is less than the first preset value, the first detection module 51 will stop outputting the first control signal. At this time, the locking module 53 will stop working because it does not receive the first control signal. When the locking module 53 stops working, the switching module 54 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 resource waste when the inverter circuit 40 restarts.

[0030] It should be noted that during the charging process of the bus capacitor C6, the voltage of the bus capacitor C6 will rise. When the bus voltage rises to a value greater than the second preset value, the switch module 54 is turned on, thereby starting to transmit the bus voltage. After the LLC circuit 20 stops working, the bus voltage stored in the bus capacitor C6 will be discharged to the high-voltage BUCK circuit 30 through the switch module 54, resulting in a decrease in the energy stored in the bus capacitor C6. When the bus voltage is less than the second preset value, although the second detection module 52 will stop working, the locking module 53 will lock the switch module 54 to the on state based on the first control signal output by the first detection module 51, thereby allowing the bus capacitor C6 to discharge rapidly to the high-voltage BUCK circuit 30 through the switch module 54. When the voltage stored in the bus capacitor C6 is discharged below the first preset value, the locking module 53 will stop working, thereby turning off the switch module 54 and stopping the discharge of the bus capacitor C6. Based on this, the voltage output by the high-voltage BUCK circuit 30 can meet the operating requirements of the inverter circuit 40 while reducing the turn-on time and energy consumption.

[0031] In yet another embodiment, please refer to Figure 3 , Figure 3This is a circuit diagram of an input control circuit provided in an embodiment of the present invention, such as... Figure 3 As shown, the first detection module 51 is a Zener diode DZ1; the second detection module 52 includes resistors R5 and R6 and a 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 second detection module 52 and the locking module 53 respectively.

[0032] The cathode of the Zener diode DZ2 is connected to the first detection module 51 through the resistor R5, and the cathode of the Zener diode DZ2 is also grounded through the resistor R6. The anode of the Zener diode DZ2 is connected to the locking module 53.

[0033] Specifically, the Zener diode DZ1 receives the bus voltage of the bus capacitor C6 in real time. When the bus voltage exceeds the Zener diode DZ1's regulated voltage value (first preset value), the Zener diode DZ1 breaks down. After the Zener diode DZ1 breaks down, it outputs a first control signal to the locking module 53 and simultaneously transmits the bus voltage to the second detection module 52. Conversely, when the bus voltage is less than the Zener diode DZ1's regulated voltage value, the Zener diode DZ1 reverse-biased cutoff, thereby stopping the output of the first control signal and the transmission of the bus voltage. When the second detection module 52 receives the bus voltage, resistors R5 and R6 divide the bus voltage 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 is broken down, and at this time, the Zener diode DZ2 outputs a second control signal to the locking module 53. When the divided bus voltage is less than the Zener diode DZ2's regulated voltage value, the Zener diode DZ2 is cut off, thereby stopping the output of the second control signal.

[0034] In yet another embodiment, such as Figure 2 As shown, the locking module 53 includes a locking unit 531 and a control unit 532; The locking unit 531 is connected to the first detection module 51 and the control unit 532 respectively, and the control unit 532 is also connected to the second detection module 52 and the switch module 54 respectively. The control unit 532 is used to receive the second control signal and start working when the second control signal is received, so as to output a drive signal to the locking unit 531 and control the switch module 54 to be turned on based on the drive signal; The locking unit 531 is used to receive the first control signal, and when it receives the drive signal, it starts to work based on the first control signal and the drive signal, thereby outputting a locking signal to the control unit 532 so that the control unit 532 maintains its working state based on the locking signal.

[0035] Specifically, during the charging process of the bus capacitor C6, if the bus voltage is greater than the second preset value, the control unit 532 will receive a second control signal, and the locking unit 531 will receive the first control signal. When the control unit 532 receives the second control signal, it will start working based on the second control signal, thereby outputting a drive signal. When the control unit 532 outputs the drive signal, the switching module 54 will receive the drive signal and turn on based on the drive signal, thereby transmitting the bus voltage to the high-voltage BUCK circuit 30; on the other hand, the locking unit 531 will also receive the drive signal and start working when it receives both the first control signal and the drive signal, thereby outputting a locking signal to the control unit 532, so that the control unit 532 maintains its working state based on the locking signal. At this time, even if the bus voltage is less than the second preset value, the control unit 532 can still maintain its working state, thereby continuously controlling the switching module 54 to turn on, so that the bus capacitor C6 discharges the stored voltage to the high-voltage BUCK circuit 30 through the switching module 54.

[0036] It should be noted that when the control unit 532 receives the locking signal, it maintains its operating state based on the locking signal, thereby continuously outputting a drive signal, which keeps the switch module 54 in a conducting state. Simultaneously, it controls the locking unit 531 to also continuously operate, thereby continuously outputting a locking signal. Based on this, the control unit 532 can continuously control the switch module 54 to conduct based on the locking signal and the first control signal when the first detection module 51 outputs the first control signal, thereby discharging the bus voltage of the bus capacitor C6; and when the LLC circuit 20 stops working and the first detection module 51 stops outputting the first control signal, it controls the switch module 54 to turn off, thereby stopping the discharging of the bus voltage of the bus capacitor C6, thus meeting safety requirements.

[0037] In some embodiments, such as Figure 3 As shown, the control unit 532 includes a switch Q3, a resistor R2, and a resistor R7; the locking unit 531 includes a switch Q2, a resistor R3, and a resistor R4. The control terminal of the switch Q3 is connected to the second detection module 52 and the locking unit 531 respectively. The control terminal of the switch Q3 is also grounded through the resistor R7. The first terminal of the switch Q3 is connected to the locking unit 531. The first terminal of the switch Q3 is also connected to the switch module 54 through the resistor R2. The second terminal of the switch Q3 is used for grounding.

[0038] The control terminal of the switch Q2 is connected to the control unit 532 through the resistor R4, the first terminal of the switch Q2 is connected to the first detection module 51 through the resistor R3, and the second terminal of the switch Q2 is connected to the control unit 532.

[0039] When the first detection module 51 outputs a first control signal and the second detection module 52 outputs a second control signal, the control terminal of the switch Q3 receives the second control signal and turns on based on the second control signal. After the switch Q3 turns on, it outputs a drive signal. At this time, the switch module 54 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 Q2 also receives the drive signal, and simultaneously, the first terminal of the switch Q2 receives the first control signal through the resistor R3. The switch Q2 turns on based on the first and second control signals. After the switch Q2 turns on, it continuously outputs a lock signal to the control terminal of the switch Q3, thereby locking the switch Q3 into a conducting state.

[0040] When the switch Q3 is turned on, the second detection module 52 stops outputting the second control signal. If the first detection module 51 continues to output the first control signal, the switch Q2 will remain on and the switch Q3 will also remain on, so that the switch module 54 continues to transmit the bus voltage.

[0041] If the first detection module 51 stops outputting the first control signal, then the switch Q2 is turned off. When the switch Q2 is turned off, it stops outputting the lock signal, and the switch Q3 is also turned off, thereby turning off the switch module 54. Based on this, startup time and energy consumption can be reduced while meeting safety regulations.

[0042] In yet another embodiment, such as Figure 3 As shown, the switching module 54 includes a switching transistor Q1 and a resistor R1; The control terminal of the switch Q1 is connected to the locking module 53. 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 high-voltage BUCK circuit 30.

[0043] When the locking module 53 outputs a drive signal, the switch Q1 receives the drive signal through the resistor R2 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 locking module 53 stops outputting the drive signal, the switch Q1 turns off, thereby stopping the transmission of the bus voltage.

[0044] It should be noted that during the voltage conversion process of the LLC circuit 20 on the power supply 10, if the voltage stored in the bus capacitor C6 exceeds the third preset value, or if the output voltage of the high-voltage BUCK circuit 30 exceeds the target voltage due to an abnormality, it will cause large-scale damage to the circuit, thereby reducing the reliability and safety of the energy storage system. Therefore, in some embodiments, such as Figure 2 As shown, the input control circuit 50 also includes a protection module 55; The protection module 55 is connected to the first detection module 51 and the locking module 53 respectively, and the protection module 55 is also used to connect to the high voltage BUCK circuit 30. The protection module 55 is used to receive the bus voltage and the output voltage of the high-voltage BUCK circuit 30, and when the bus voltage is greater than a third preset value or the output voltage is greater than a target voltage value, it outputs a shutdown signal to the locking module 53 to make the locking module 53 stop working, thereby turning off the switch module 54, wherein the third preset value is greater than the second preset value.

[0045] The protection module 55 continuously monitors the bus voltage of the bus capacitor C6 and the output voltage of the high-voltage BUCK circuit 30. When the bus voltage exceeds the third preset value or the output voltage exceeds the target voltage, it considers the circuit at risk of damage. In this case, the protection module 55 outputs a shutdown signal to the locking module 53 based on the bus voltage or the output voltage, causing the locking module 53 to stop operating based on the shutdown signal. When the locking module 53 stops operating, the switching module 54 also stops operating, thereby stopping the transmission of the bus voltage and causing the high-voltage BUCK circuit 30 to stop working. This protects the downstream circuitry, preventing large-scale circuit damage and improving the reliability of the energy storage system.

[0046] In yet another embodiment, such as Figure 3 As shown, the protection module 55 includes a switch Q7, a resistor R15, a Zener diode DZ5, and a Zener diode DZ6. The control terminal of the switching transistor Q7 is connected to the cathodes of the Zener diodes DZ5 and DZ6 respectively through the resistor R15. The first terminal of the switching transistor Q7 is connected to the locking module 53, and the second terminal of the switching transistor Q7 is grounded. The cathode of the Zener diode DZ5 is connected to the first detection module 51, and the cathode of the Zener diode DZ6 is connected to the high-voltage BUCK circuit 30.

[0047] Specifically, when the bus voltage exceeds a third preset value, the Zener diode DZ5 breaks down. After breaking down, Zener diode DZ5 controls the switching transistor Q7 to turn on based on the bus voltage. When switching transistor Q7 is on, it outputs a turn-off signal to the locking module 53, causing the locking module 53 to turn off. Similarly, when the output voltage exceeds the Zener voltage of Zener diode DZ6, Zener diode DZ6 breaks down, and switching transistor Q7 turns on, outputting a turn-off signal to turn off the locking module 53.

[0048] In yet another embodiment, such as Figure 3 As shown, the protection module 55 also includes a capacitor C9. The first end of the capacitor C9 is connected to the first end of the switching transistor Q7, and the second end of the capacitor C9 is grounded. The capacitor C9 is used to delay the turn-on time of the switching transistor Q3 to prevent the switching transistor Q3 from turning on before the switching transistor Q7 when the bus voltage is greater than a third preset value, thereby preventing a fault in the subsequent circuit.

[0049] In some embodiments, please refer to Figure 4 , Figure 4 This is a circuit diagram of an input control circuit provided in another embodiment of the present invention, such as... Figure 4As shown, when the LLC circuit 20 charges the bus capacitor C6, the Zener diode DZ1 detects the bus voltage in real time. When the bus voltage is greater than a first preset value, it transmits the bus voltage and outputs a first control signal to the switch Q2. When the Zener diode DZ1 outputs the bus voltage, the Zener diode DZ2 receives the bus voltage and outputs a second control signal to the control terminal of the switch Q3 when the bus voltage is greater than a second preset value. The switch Q3 turns on when it receives the second control signal. When the switch Q3 turns on, the voltage at the control terminal of the switch Q2 is pulled low. At the same time, the resistors R1 and R2 begin to divide the bus voltage, thereby turning on both the switch Q2 and the switch Q1. When the switch Q1 turns on, the bus voltage is output to the high-voltage BUCK circuit 30 through the switch Q1, so that the high-voltage BUCK circuit 30 outputs a suitable voltage to the inverter circuit 40 based on the bus voltage. When the switch Q2 is turned on, the control terminal of the switch Q3 will be pulled high by the switch Q2, so that even if the bus voltage is less than the second preset value, the switch Q3 will still be in the on state until the bus voltage is less than the first preset value, at which point the switch Q2 will be turned off, the switch Q3 will also be turned off, and the switch Q1 will also be turned off.

[0050] If the bus voltage exceeds a third preset value, the Zener diode DZ5 breaks down, the control terminal voltage of the switch Q7 is pulled high, and Q7 turns on. When Q7 turns on, the control terminal voltage of the switch Q3 is pulled low, and Q3 turns off. Switch Q1 also turns off, thus stopping the transmission of the bus voltage. Additionally, when the high-voltage BUCK circuit 30 transforms the bus voltage, the Zener diode DZ6 also monitors the output voltage of the high-voltage BUCK circuit 30 in real time and breaks down when the output voltage exceeds the target voltage. When the Zener diode DZ6 breaks down, switch Q7 turns on, switch Q3 turns off, and switch Q1 turns off, thus stopping the transmission of the bus voltage. Based on this, the reliability of the circuit can be improved.

[0051] This invention provides an input control circuit, comprising a first detection module, a second detection module, a locking module, and a switching module. The first detection module is connected to both the second detection module and the locking module. The second detection module is connected to the locking module, and the locking module is also connected to the switching module. Both the first detection module and the switching module are used to connect to a bus capacitor. The first detection module detects the bus voltage of the bus capacitor and outputs a first control signal when the bus voltage is greater than a first preset value. The second detection module receives the bus voltage and outputs a second control signal to the locking module when the bus voltage is greater than a second preset value, wherein the second preset value is greater than the first preset value. The locking module only controls the switching module to conduct to transmit the bus voltage when it simultaneously receives the first and second control signals. This prevents the inverter circuit from malfunctioning due to the switching module's conduction when the bus voltage does not meet the normal operating requirements, thus improving the safety of the energy storage system. After startup, if the locking module does not receive the second control signal, it assumes the bus voltage cannot support the inverter circuit's operation. In this case, the locking module responds to the first control signal to keep the switching module on, thereby releasing the energy stored in the bus capacitor. When the locking module does not receive the first control signal, it stops operating, causing the switching module to turn off and stopping the transmission of bus voltage. This prevents excessive discharge of the bus capacitor, which could lead to excessively long startup times during inverter restart, and also reduces battery energy consumption, improving the reliability 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. An input control circuit, characterized in that, The invention is applied to an energy storage system, which includes an LLC circuit and a bus capacitor. The LLC circuit is connected to the bus capacitor, and the bus capacitor is configured to charge based on the output voltage of the LLC circuit when the LLC circuit is working, and to stop charging when the LLC circuit stops working. The input control circuit includes a first detection module, a second detection module, a locking module, and a switching module. The first detection module is connected to the second detection module and the locking module respectively. The second detection module is connected to the locking module. The locking module is also connected to the switch module. The first detection module and the switch module are also used to connect the bus capacitor. The switch module is also used to connect the high-voltage BUCK circuit. The first detection module is used to detect the bus voltage of the bus capacitor in real time, and output a first control signal when the voltage of the bus capacitor is greater than a first preset value; The second detection module is used to receive the bus voltage and output a second control signal to the locking module when the bus voltage is greater than a second preset value; And when the bus voltage is less than a second preset value, the output of the second control signal is stopped, wherein the second preset value is greater than the first preset value; The locking module is configured to start operating upon receiving the first control signal and the second control signal, controlling the switching module to conduct so that the switching module transmits the bus voltage to the high-voltage BUCK circuit; and After starting operation according to the first control signal and the second control signal, if the second control signal is not received, the operation state is maintained based on the first control signal to keep the switch module on, thereby enabling the switch module to continuously transmit the bus voltage; and if the first control signal is not received, the switch module is controlled to disconnect to stop transmitting the bus voltage.

2. The input 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 second detection module and the locking module respectively.

3. The input control circuit according to claim 1, characterized in that, The second detection module includes resistors R5 and R6 and a Zener diode DZ2; The cathode of the Zener diode DZ2 is connected to the first detection module through the resistor R5, and the cathode of the Zener diode DZ2 is also grounded through the resistor R6. The anode of the Zener diode DZ2 is connected to the locking module.

4. The input control circuit according to claim 1, characterized in that, The switching module includes a switching transistor Q1 and a resistor R1; The control terminal of the switch Q1 is connected to the locking module. 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 high-voltage BUCK circuit.

5. The input control circuit according to any one of claims 1-4, characterized in that, The locking module includes a locking unit and a control unit; The locking unit is connected to the first detection module and the control unit respectively, and the control unit is also connected to the second detection module and the switch module respectively; The control unit is used to receive the second control signal and start working when the second control signal is received, so as to output a drive signal to the locking unit and control the switch module to be turned on based on the drive signal; The locking unit is used to receive the first control signal, and when it receives the drive signal, it starts to work based on the first control signal and the drive signal, thereby outputting a locking signal to the control unit so that the control unit maintains its working state based on the locking signal.

6. The input control circuit according to claim 5, characterized in that, The control unit includes a switch Q3, a resistor R2, and a resistor R7; The control terminal of the switch Q3 is connected to the second detection module and the locking unit respectively. The control terminal of the switch Q3 is also grounded through the resistor R7. The first terminal of the switch Q3 is connected to the locking unit. The first terminal of the switch Q3 is also connected to the switch module through the resistor R2. The second terminal of the switch Q3 is used for grounding.

7. The input control circuit according to claim 5, characterized in that, The locking unit includes a switch Q2, a resistor R3, and a resistor R4; The control terminal of the switch Q2 is connected to the control unit through the resistor R4, the first terminal of the switch Q2 is connected to the first detection module through the resistor R3, and the second terminal of the switch Q2 is connected to the control unit.

8. The input control circuit according to any one of claims 1-4, characterized in that, The input control circuit also includes a protection module; The protection module is connected to the first detection module and the locking module respectively, and the protection module is also used to connect to the high-voltage BUCK circuit; The protection module is used to receive the bus voltage and the output voltage of the high-voltage BUCK circuit, and when the bus voltage is greater than a third preset value or the output voltage is greater than a target voltage value, it outputs a shutdown signal to the locking module to make the locking module stop working, thereby turning off the switch module, wherein the third preset value is greater than the second preset value.

9. The input control circuit according to claim 8, characterized in that, The protection module includes a switch Q7, a resistor R15, a Zener diode DZ5, and a Zener diode DZ6; The control terminal of the switching transistor Q7 is connected to the cathodes of the Zener diodes DZ5 and DZ6 respectively through the resistor R15. The first terminal of the switching transistor Q7 is connected to the locking module, and the second terminal of the switching transistor Q7 is grounded. The cathode of the Zener diode DZ5 is connected to the first detection module, and the cathode of the Zener diode DZ6 is connected to the high-voltage BUCK circuit.

10. An energy storage system, characterized in that, The energy storage system includes: The power supply, LLC circuit, bus capacitor, high-voltage BUCK circuit, inverter circuit, and input control circuit as described in any one of claims 1-9; The LLC circuit is connected to the power supply and the bus capacitor respectively. The bus capacitor is also connected to the input control circuit, which is connected to the inverter circuit through the high-voltage BUCK circuit.

Images