Drive control circuit, inverter and energy storage device

Abstract

The utility model provides a drive control circuit, an inverter and an energy storage device. The driving control circuit comprises a first high-frequency switch bridge arm, a second high-frequency switch bridge arm, a capacitor series circuit, a first voltage division circuit, a second voltage division circuit, a first discharging circuit, a second discharging circuit, a voltage detection circuit and a voltage-sharing driving circuit. The first end of the voltage-sharing driving circuit is connected with the output end of the voltage detection circuit, the control end of the first discharging circuit and the control end of the second discharging circuit, and the second end of the voltage-sharing driving circuit is connected with the second end of the capacitor series circuit. The voltage-sharing driving circuit drives the first discharge circuit and the second discharge circuit to discharge according to a first voltage at the output end of the voltage detection circuit and a second voltage at the second end of the capacitor series circuit. In the process, the voltage-sharing capability of the capacitor series circuit can be enhanced, and the problems of electrolytic capacitor damage and rectification circuit overvoltage damage caused by capacitor failure or capacitor non-voltage-sharing are improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and more specifically, to a drive control circuit, an inverter, and an energy storage device. Background Technology

[0002] To support a wide voltage range output, some modules of energy storage systems use relays connected in series and parallel. This improves the efficiency and power density of the energy storage system, resulting in superior performance.

[0003] In relevant technical solutions, such as Figure 1 As shown, the first high-frequency switching bridge arm 102' charges the first electrolytic capacitor EC1' and the first capacitor C1', and the second high-frequency switching bridge arm 104' charges the second electrolytic capacitor EC2' and the second capacitor C2'. The first voltage divider circuit 110' and the second voltage divider circuit 112' achieve voltage equalization by equal resistance voltage division.

[0004] The above topology scheme has the following drawbacks:

[0005] First, when one of the first high-frequency switch bridge arm 102' and the second high-frequency switch bridge arm 104' fails, it will cause the voltage on the first electrolytic capacitor EC1' and the first capacitor C1' to rise instantaneously, or cause the voltage on the second electrolytic capacitor EC2' and the second capacitor C2' to rise instantaneously, which can easily cause capacitor failure.

[0006] Secondly, uneven voltage distribution in capacitors can easily occur during shutdown, relay series-parallel switching, pre-charge startup, and when a certain tube or component fails, all of which are operating conditions where the device is not powered on.

[0007] When the above-mentioned defects exist, it will cause overvoltage damage to the first electrolytic capacitor EC1' or the second electrolytic capacitor EC2'. At the same time, it will also cause overvoltage damage to the rectifier circuit in the first high-frequency switch bridge arm 102' and the second high-frequency switch bridge arm 104'. Utility Model Content

[0008] The present invention aims to at least solve the technical problems existing in the prior art or related technologies, such as damage to electrolytic capacitors and damage to rectifier circuits caused by capacitor failure or uneven voltage distribution.

[0009] Therefore, the first aspect of this utility model is that it provides a drive control circuit.

[0010] The second aspect of this invention is that it provides an inverter.

[0011] The third aspect of this utility model is that it provides an energy storage device.

[0012] Therefore, according to a first aspect of the present application, the present application provides a drive control circuit, comprising: a first high-frequency switching bridge arm; a second high-frequency switching bridge arm; a capacitor series circuit, a first end of the capacitor series circuit being connected with a first end of the first high-frequency switching bridge arm, a second end of the capacitor series circuit being connected with a second end of the first high-frequency switching bridge arm and a first end of the second high-frequency switching bridge arm respectively, and a third end of the capacitor series circuit being connected with a second end of the second high-frequency switching bridge arm; a first voltage dividing circuit, a first end of the first voltage dividing circuit being connected with the first end of the capacitor series circuit, and a second end of the first voltage dividing circuit being connected with the second end of the capacitor series circuit; a second voltage dividing circuit, a first end of the second voltage dividing circuit being connected with the second end of the capacitor series circuit, and a second end of the second voltage dividing circuit being connected with the third end of the capacitor series circuit; a first discharging circuit, a first end of the first discharging circuit being connected with the first end of the first voltage dividing circuit, and a second end of the first discharging circuit being connected with the second end of the capacitor series circuit; a second discharging circuit, a first end of the second discharging circuit being connected with the second end of the capacitor series circuit, and a second end of the second discharging circuit being connected with the second end of the second voltage dividing circuit; a voltage detection circuit, a first end of the voltage detection circuit being connected with the first end of the first voltage dividing circuit, and a second end of the voltage detection circuit being connected with the second end of the second voltage dividing circuit; and a voltage equalization driving circuit, a first end of the voltage equalization driving circuit being connected with an output end of the voltage detection circuit, a control end of the first discharging circuit and a control end of the second discharging circuit respectively, a second end of the voltage equalization driving circuit being connected with the second end of the capacitor series circuit, and the voltage equalization driving circuit driving the first discharging circuit and the second discharging circuit to discharge according to a first voltage at the output end of the voltage detection circuit and a second voltage at the second end of the capacitor series circuit.

[0013] The present application provides a drive control circuit, which comprises a first high-frequency switching bridge arm, a second high-frequency switching bridge arm, a capacitor series circuit, a first voltage dividing circuit, a second voltage dividing circuit, a first discharging circuit, a second discharging circuit, a voltage equalization driving circuit and a voltage detection circuit.

[0014] Specifically, when one of the first high-frequency switching bridge arm and the second high-frequency switching bridge arm is short-circuited, the voltage on the capacitor in the capacitor series circuit instantaneously rises, which easily causes the capacitor to fail.

[0015] In the drive control circuit, the first discharge circuit and the second discharge circuit are used to actively equalize voltage, enhance the voltage equalization capability of the capacitor series circuit, and meet the voltage equalization needs in different scenes.

[0016] In addition, the drive control circuit has the following additional technical features.

[0017] In some technical solutions, optionally, the capacitor series circuit comprises: a first energy storage component, a first end of the first energy storage component being connected with a first end of the first high-frequency switching bridge arm, and a second end of the first energy storage component being connected with a second end of the first high-frequency switching bridge arm and a first end of the second high-frequency switching bridge arm respectively; and a second energy storage component, a first end of the second energy storage component being connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively, and a second end of the second energy storage component being connected with a second end of the second high-frequency switching bridge arm.

[0018] In the technical solution, the first energy storage component is used to store the electric energy output by the first high-frequency switching bridge arm, and the second energy storage component is used to store the electric energy output by the second high-frequency switching bridge arm.

[0019] The first energy storage component and the second energy storage component are energy storage components arranged in series, and thus the voltage resistance of the capacitor can be met, and the working needs in different scenes can be met.

[0020] In some technical solutions, optionally, the first energy storage component comprises: a first electrolytic capacitor, a first end of the first electrolytic capacitor being connected with a first end of the first high-frequency switching bridge arm, and a second end of the first electrolytic capacitor being connected with a second end of the first high-frequency switching bridge arm and a first end of the second high-frequency switching bridge arm respectively; and / or a first capacitor, a first end of the first capacitor being connected with the first end of the first high-frequency switching bridge arm, and a second end of the first capacitor being connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively.

[0021] In the technical solution, the first high-frequency switching bridge arm can convert high-frequency pulsating direct current into stable direct current, and then store the direct current electric energy in the first energy storage component.

[0022] In some embodiments, the second energy storage component comprises: a second electrolytic capacitor, a first end of the second electrolytic capacitor is connected to a second end of the first high-frequency switching bridge arm and a first end of the second high-frequency switching bridge arm respectively, and a second end of the second electrolytic capacitor is connected to a second end of the second high-frequency switching bridge arm; and / or a second capacitor, a first end of the second capacitor is connected to a second end of the first high-frequency switching bridge arm and a first end of the second high-frequency switching bridge arm respectively, and a second end of the second capacitor is connected to a second end of the second high-frequency switching bridge arm.

[0023] In this embodiment, the second high-frequency switching bridge arm can convert high-frequency pulsating direct current into stable direct current, and then store the direct current electrical energy in the second energy storage component. The second energy storage component can include only one electrolytic capacitor, only a second capacitor, or both a second electrolytic capacitor and a second capacitor according to actual use requirements.

[0024] In some embodiments, the voltage detection circuit comprises: a first resistor, a first end of the first resistor is connected to a first end of the first voltage dividing circuit; a second resistor, a first end of the second resistor is connected to a second end of the first resistor, a second end of the second resistor is connected to a second end of the second voltage dividing circuit, and the first end of the second resistor is connected to a first end of the voltage equalization driving circuit.

[0025] In this embodiment, the first resistor and the second resistor are used as sampling resistors, and are connected in series. The first end of the first resistor is connected to the first end of the first voltage dividing circuit, and the second end of the second resistor is connected to the second end of the second voltage dividing circuit. Therefore, the voltage output by the first end of the second resistor can represent the voltage of the first end of the first voltage dividing circuit and the second end of the second voltage dividing circuit. In this case, by configuring the resistance values of the first resistor and the second resistor, the voltage output by the first end of the second resistor can be used as the voltage at the midpoint of the sampling resistors.

[0026] In this process, the intermediate value of the voltage at the first end of the first voltage dividing circuit and the voltage at the second end of the second voltage dividing circuit can be obtained, which can be used as a reference for controlling the discharging of the first discharging circuit and the second discharging circuit. In this way, in the case where the voltage equalization of the capacitor series circuit by the first voltage dividing circuit and the second voltage dividing circuit is not good, the first discharging circuit and the second discharging circuit can be used for active voltage equalization, which can improve the problem of capacitor failure or uneven voltage equalization, and prevent the electrolytic capacitor from being damaged and the rectifier circuit from being damaged due to overvoltage.

[0027] In some embodiments, the voltage equalization driving circuit further comprises a third resistor, a first end of the third resistor is connected to the output end of the voltage detection circuit and the control end of the first discharging circuit, and a second end of the third resistor is connected to the second end of the capacitor series circuit; and a fourth resistor, a first end of the fourth resistor is connected to the second end of the capacitor series circuit, and a second end of the fourth resistor is connected to the output end of the voltage detection circuit and the control end of the second discharging circuit.

[0028] In the embodiments, the third resistor is arranged to take the second end of the capacitor series circuit as a reference, and form a voltage at the control end of the first discharging circuit, so as to realize the discharging control of the first discharging circuit and protect the first discharging circuit, thereby reducing the probability of overvoltage damage of the first discharging circuit.

[0029] Similarly, the fourth resistor has a similar function to the third resistor, and details are not repeated here.

[0030] In some embodiments, the voltage equalization driving circuit further comprises a first Zener diode, a first end of the first Zener diode is connected to the control end of the first discharging circuit, and a second end of the first Zener diode is connected to the second end of the capacitor series circuit; and / or a second Zener diode, a first end of the second Zener diode is connected to the second end of the capacitor series circuit, and a second end of the second Zener diode is connected to the control end of the second discharging circuit.

[0031] In the embodiments, the first Zener diode and the second Zener diode are arranged to limit the driving voltage amplitude of the control end of the first discharging circuit and the control end of the second discharging circuit, so as to prevent the driving peak overvoltage from causing damage, thereby improving the reliability of the driving control circuit.

[0032] In some embodiments, the first discharging circuit comprises a first switch tube, a drain of the first switch tube is connected to the first end of the first voltage divider circuit, and a source of the first switch tube is connected to the second end of the capacitor series circuit; the second discharging circuit comprises a second switch tube, a source of the second switch tube is connected to the second end of the capacitor series circuit, and a drain of the second switch tube is connected to the second end of the second voltage divider circuit; wherein the first switch tube is turned on based on the condition that the voltage at the first end of the second resistor is greater than the second voltage and the first difference is greater than or equal to the turn-on voltage of the first switch tube; the first switch tube is turned off based on the condition that the voltage at the first end of the second resistor is greater than the second voltage and the first difference is less than the turn-on voltage of the first switch tube; the second switch tube is turned on based on the condition that the voltage at the first end of the second resistor is less than the second voltage and the first difference is greater than or equal to the turn-on voltage of the second switch tube; the second switch tube is turned off based on the condition that the voltage at the first end of the second resistor is less than the second voltage and the first difference is less than the turn-on voltage of the second switch tube; and the first difference is the voltage difference between the voltage at the first end of the second resistor and the second voltage.

[0033] In the technical solution, in combination with the connection relationship of the first switch tube, the second switch tube, the first high-frequency switch bridge arm, the second high-frequency switch bridge arm, the first energy storage component and the second energy storage component, it can be seen that the first position M corresponding to the second voltage can be regarded as the midpoint position of the first energy storage component and the second energy storage component, at this time, the voltage at the first position can be regarded as the midpoint voltage of the first energy storage component and the second energy storage component.

[0034] At this time, the size between the voltage at the first end of the second resistor and the second voltage can represent the voltage equalization of the first energy storage component and the second energy storage component by the first voltage dividing circuit and the second voltage dividing circuit, and the voltage difference, that is, the first difference, can represent the degree of uneven voltage. When the voltage at the first end of the second resistor is greater than the second voltage and the first difference is greater than or equal to the on-voltage of the first switch tube, it is considered that the voltage across the first energy storage component is greater than the voltage across the second energy storage component. By controlling the conduction of the first switch tube, the voltage on the first energy storage component can be discharged through the first switch tube. With the conduction of the first switch tube, the voltage across the first energy storage component decreases until the voltage across the first energy storage component and the voltage across the second energy storage component are close, that is, the difference between the voltages across the two ends is less than the threshold value of the switch tube, that is, the on-voltage of the first switch tube. The first switch tube is turned off.

[0035] Similarly, based on the condition that the voltage at the first end of the second resistor is less than the second voltage and the first difference is greater than or equal to the on-voltage of the second switch tube, it is considered that the voltage across the first energy storage component is less than the voltage across the second energy storage component. By controlling the conduction of the second switch tube, the voltage on the second energy storage component can be discharged through the second switch tube. With the conduction of the second switch tube, the voltage across the second energy storage component decreases until the voltage across the first energy storage component and the voltage across the second energy storage component are close, that is, the difference between the voltages across the two ends is less than the threshold value of the switch tube, that is, the on-voltage of the second switch tube. The second switch tube is turned off.

[0036] In this process, the first switch tube and the second switch tube are in a self-driven mode, which has fast response speed and relatively simple control, thereby improving the capacitor voltage equalization efficiency and rate.

[0037] In addition, even if the resistance values in the first voltage dividing circuit and the second voltage dividing circuit are different, it does not affect the voltage equalization of the first energy storage component and the second energy storage component in series, which can ensure that the voltage difference between the first energy storage component and the second energy storage component is within a certain difference range, avoid capacitor overvoltage failure in the case of switch tube failure, and increase the system safety.

[0038] In some technical solutions, optionally, the first discharging circuit further comprises a first voltage-sharing resistor connected in series between the drain of the first switch tube and the first end of the first voltage-dividing circuit; and / or the second discharging circuit further comprises a second voltage-sharing resistor connected in series between the drain of the second switch tube and the second end of the second voltage-dividing circuit.

[0039] In this technical solution, the first voltage-sharing resistor and the second voltage-sharing resistor can accelerate the voltage-sharing rate of the first switch tube and the second switch tube, thereby improving the capacitor voltage-sharing efficiency and rate.

[0040] In the above technical solution, the first voltage-sharing resistor and the second voltage-sharing resistor can be valued according to actual use needs, and specific values are not described here.

[0041] According to a second aspect of the present application, the present application provides an inverter, comprising: the drive control circuit according to any one of the above.

[0042] According to a third aspect of the present application, the present application provides an energy storage device, comprising: the drive control circuit according to any one of the above; or the inverter according to the above.

[0043] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0045] Figure 1 A topological schematic diagram of a drive control circuit in the related art is shown;

[0046] Figure 2 A topological schematic diagram of a drive control circuit in the embodiment of the present application is shown;

[0047] Figure 3 A schematic block diagram of a drive control circuit in the embodiment of the present application is shown.

[0048] Wherein, Figure 1 The correspondence between the reference signs and the component names in the accompanying drawings is as follows:

[0049] 102' first high-frequency switch bridge arm, 104' second high-frequency switch bridge arm, EC1' first electrolytic capacitor, C1' first capacitor, EC2' second electrolytic capacitor, C2' second capacitor, 110' first voltage-dividing circuit, 112' second voltage-dividing circuit.

[0050] Wherein, Figure 2 AndFigure 3 The correspondence between the reference signs and the component names is as follows:

[0051] 102 first high-frequency switch bridge arm, 104 second high-frequency switch bridge arm, 106 capacitor series circuit, 1062 first energy storage component, 1064 second energy storage component, 108 first voltage dividing circuit, 110 second voltage dividing circuit, 112 first discharge circuit, 114 second discharge circuit, Q1 first switch tube, Q2 second switch tube, 116 voltage detection circuit, 118 voltage equalization driving circuit, EC1 first electrolytic capacitor, C1 first capacitor, EC2 second electrolytic capacitor, C2 second capacitor, R1 first resistor, R2 second resistor, R3 third resistor, R4 fourth resistor, ZD1 first voltage stabilizing tube, ZD2 second voltage stabilizing tube, ZR1 first voltage equalization resistor, ZR2 second voltage equalization resistor, 1022 first rectifier circuit, 1024 first switch circuit, 1042 second rectifier circuit, 1044 second switch circuit, T1 first transformer, T2 second transformer, D1 first diode, D2 second diode, D3 third diode, D4 fourth diode, D5 fifth diode, D6 sixth diode, D7 seventh diode, D8 eighth diode, 202 bridge rectifier circuit, 204 capacitor series circuit module, 206 capacitor voltage sampling circuit, 208 voltage equalization driving circuit module. DETAILED DESCRIPTION

[0052] In order to enable the above aspects, features and advantages of the present application to be more clearly understood, the following will further describe the present application with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0053] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can be practiced in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0054] In an embodiment of the present application, as Figure 2As shown, a drive control circuit is provided, comprising: a first high-frequency switching bridge arm 102; a second high-frequency switching bridge arm 104; a capacitor series circuit 106, the first end of the capacitor series circuit 106 is connected with the first end of the first high-frequency switching bridge arm 102, the second end of the capacitor series circuit 106 is connected with the second end of the first high-frequency switching bridge arm 102 and the first end of the second high-frequency switching bridge arm 104 respectively, and the third end of the capacitor series circuit 106 is connected with the second end of the second high-frequency switching bridge arm 104; a first voltage dividing circuit 108, the first end of the first voltage dividing circuit 108 is connected with the first end of the capacitor series circuit 106, and the second end of the first voltage dividing circuit 108 is connected with the second end of the capacitor series circuit 106; a second voltage dividing circuit 110, the first end of the second voltage dividing circuit 110 is connected with the second end of the capacitor series circuit 106, and the second end of the second voltage dividing circuit 110 is connected with the third end of the capacitor series circuit 106; a first discharging circuit 112, the first end of the first discharging circuit 112 is connected with the first end of the first voltage dividing circuit 108, and the second end of the first discharging circuit 112 is connected with the second end of the capacitor series circuit 106; a second discharging circuit 114, the first end of the second discharging circuit 114 is connected with the second end of the capacitor series circuit 106, and the second end of the second discharging circuit 114 is connected with the second end of the second voltage dividing circuit 110; a voltage detection circuit 116, the first end of the voltage detection circuit 116 is connected with the first end of the first voltage dividing circuit 108, and the second end of the voltage detection circuit 116 is connected with the second end of the second voltage dividing circuit 110; a voltage equalization driving circuit 118, the first end of the voltage equalization driving circuit 118 is connected with the output end of the voltage detection circuit 116, the control end of the first discharging circuit 112 and the control end of the second discharging circuit 114 respectively, the second end of the voltage equalization driving circuit 118 is connected with the second end of the capacitor series circuit 106, and the voltage equalization driving circuit 118 drives the first discharging circuit 112 and the second discharging circuit 114 to discharge according to the first voltage at the output end of the voltage detection circuit 116 and the second voltage at the second end of the capacitor series circuit 106.

[0055] The utility model provides a kind of drive control circuit, which includes first high-frequency switching bridge arm 102, second high-frequency switching bridge arm 104, capacitor series circuit 106, first voltage dividing circuit 108, second voltage dividing circuit 110, first discharging circuit 112, second discharging circuit 114, voltage equalization driving circuit 118 and voltage detection circuit 116.It can utilize voltage detection circuit 116 to detect the voltage equalization of first voltage dividing circuit 108 and second voltage dividing circuit 110 to capacitor series circuit 106, and then utilize first discharging circuit 112 and second discharging circuit 114 to actively voltage equalization in the case of poor voltage equalization.In this process, the voltage equalization capability of capacitor series circuit 106 can be enhanced, and the problems of electrolytic capacitor damage and rectifier circuit overvoltage damage caused by capacitor failure or uneven voltage can be improved.

[0056] Specifically, when one of the first high-frequency switching bridge arm 102 and the second high-frequency switching bridge arm 104 is short-circuited, the voltage on the capacitor in the capacitor series circuit 106 is instantaneously increased, which is easy to cause the capacitor to be short-circuited. In the working conditions such as shutdown, relay series-parallel switching, pre-charging start-up, and failure of a certain switching tube, the capacitor is easy to be unevenly pressed.

[0057] In the drive control circuit provided in the utility model, the first discharge circuit 112 and the second discharge circuit 114 can be used for active voltage sharing, the voltage sharing capability of the capacitor series circuit 106 is enhanced, and then the voltage sharing needs in different scenes are met.

[0058] In some embodiments, optionally, the capacitor series circuit 106 comprises: a first energy storage component 1062, a first end of the first energy storage component 1062 being connected with a first end of the first high-frequency switching bridge arm 102, and a second end of the first energy storage component 1062 being connected with a second end of the first high-frequency switching bridge arm 102 and a first end of the second high-frequency switching bridge arm 104 respectively; and a second energy storage component 1064, a first end of the second energy storage component 1064 being connected with the second end of the first high-frequency switching bridge arm 102 and the first end of the second high-frequency switching bridge arm 104 respectively, and a second end of the second energy storage component 1064 being connected with a second end of the second high-frequency switching bridge arm 104.

[0059] In the technical scheme, the first energy storage component 1062 can be used for storing the electric energy output by the first high-frequency switching bridge arm 102, and the second energy storage component 1064 can be used for storing the electric energy output by the second high-frequency switching bridge arm 104.

[0060] The first energy storage component 1062 and the second energy storage component 1064 are energy storage components arranged in series, and thus the voltage resistance requirement of the capacitor can be met, and the working needs in different scenes can be met.

[0061] In some embodiments, optionally, the first energy storage component 1062 comprises: a first electrolytic capacitor EC1, a first end of the first electrolytic capacitor EC1 being connected with a first end of the first high-frequency switching bridge arm 102, and a second end of the first electrolytic capacitor EC1 being connected with a second end of the first high-frequency switching bridge arm 102 and a first end of the second high-frequency switching bridge arm 104 respectively; and / or a first capacitor C1, a first end of the first capacitor C1 being connected with a first end of the first high-frequency switching bridge arm 102, and a second end of the first capacitor C1 being connected with a second end of the first high-frequency switching bridge arm 102 and a first end of the second high-frequency switching bridge arm 104 respectively.

[0062] In this embodiment, the first high-frequency switching bridge arm 102 can convert the high-frequency pulsating direct current into stable direct current, and then store the direct current electrical energy in the first energy storage component 1062. The first energy storage component 1062 can include only one electrolytic capacitor according to actual use needs, or only include the first capacitor C1, or include both the first electrolytic capacitor EC1 and the first capacitor C1.

[0063] In some embodiments, optionally, the second energy storage component 1064 includes: a second electrolytic capacitor EC2, a first end of the second electrolytic capacitor EC2 is connected with a second end of the first high-frequency switching bridge arm 102 and a first end of the second high-frequency switching bridge arm 104 respectively, and a second end of the second electrolytic capacitor EC2 is connected with a second end of the second high-frequency switching bridge arm 104; and / or a second capacitor C2, a first end of the second capacitor C2 is connected with the second end of the first high-frequency switching bridge arm 102 and the first end of the second high-frequency switching bridge arm 104 respectively, and a second end of the second capacitor C2 is connected with the second end of the second high-frequency switching bridge arm 104.

[0064] In this embodiment, the second high-frequency switching bridge arm 104 can convert the high-frequency pulsating direct current into stable direct current, and then store the direct current electrical energy in the second energy storage component 1064. The second energy storage component 1064 can include only one electrolytic capacitor according to actual use needs, or only include the second capacitor C2, or include both the second electrolytic capacitor EC2 and the second capacitor C2.

[0065] In some embodiments, optionally, the voltage detection circuit 116 includes: a first resistor R1, a first end of the first resistor R1 is connected with a first end of the first voltage dividing circuit 108; a second resistor R2, a first end of the second resistor R2 is connected with a second end of the first resistor R1, a second end of the second resistor R2 is connected with a second end of the second voltage dividing circuit 110, and the first end of the second resistor R2 is connected with a first end of the voltage equalization driving circuit 118.

[0066] In this embodiment, the first resistor R1 and the second resistor R2 are used as sampling resistors, and are connected in series. The first end of the first resistor R1 is connected with the first end of the first voltage dividing circuit 108, and the second end of the second resistor R2 is connected with the second end of the second voltage dividing circuit 110. Therefore, the voltage output by the first end of the second resistor R2 can represent the voltage of the first end of the first voltage dividing circuit 108 and the second end of the second voltage dividing circuit 110. At this time, by configuring the resistance values of the first resistor R1 and the second resistor R2, the voltage output by the first end of the second resistor R2 can be used as the voltage of the midpoint of the sampling resistors.

[0067] In the process, the intermediate value of the voltage at the first end of the first voltage dividing circuit 108 and the voltage at the second end of the second voltage dividing circuit 110 can be collected, so as to take the intermediate value as a reference for controlling the discharging of the first discharging circuit 112 and the second discharging circuit 114, and then in the case that the voltage division of the capacitor series circuit by the first voltage dividing circuit 108 and the second voltage dividing circuit 110 is poor, the first discharging circuit 112 and the second discharging circuit 114 are used for active voltage division, so as to improve the problem of capacitor failure or uneven voltage division of the capacitor, causing damage to the electrolytic capacitor and the rectifier circuit.

[0068] In some embodiments, optionally, the voltage division driving circuit 118 comprises: a third resistor R3, a first end of the third resistor R3 is connected with the output end of the voltage detection circuit 116 and the control end of the first discharging circuit 112 respectively, and a second end of the third resistor R3 is connected with the second end of the capacitor series circuit 106; and a fourth resistor R4, a first end of the fourth resistor R4 is connected with the second end of the capacitor series circuit 106, and a second end of the fourth resistor R4 is connected with the output end of the voltage detection circuit 116 and the control end of the second discharging circuit 114 respectively.

[0069] In the technical solution, by setting the third resistor R3, the second end of the capacitor series circuit 106 is taken as a reference, and a voltage is formed at the control end of the first discharging circuit 112, so as to realize the discharging control of the first discharging circuit 112 and also protect the first discharging circuit 112, thereby reducing the probability of overvoltage damage of the first discharging circuit 112.

[0070] Similarly, the fourth resistor R4 has a similar function to the third resistor R3, and details are not repeated here.

[0071] In some technical solutions, optionally, the voltage division driving circuit 118 further comprises: a first zener ZD1, a first end of the first zener ZD1 is connected with the control end of the first discharging circuit 112, and a second end of the first zener ZD1 is connected with the second end of the capacitor series circuit 106; and / or a second zener ZD2, a first end of the second zener ZD2 is connected with the second end of the capacitor series circuit 106, and a second end of the second zener ZD2 is connected with the control end of the second discharging circuit 114.

[0072] In the technical solution, the first zener ZD1 and the second zener ZD2 can limit the driving voltage amplitude of the control end of the first discharging circuit 112 and the control end of the second discharging circuit 114, prevent driving peak overvoltage, and cause damage, so as to improve the reliability of the driving control circuit.

[0073] In some embodiments, the first discharging circuit 112 includes a first switch Q1, a drain of the first switch Q1 is connected with the first end of the first voltage divider circuit 108, and a source of the first switch Q1 is connected with the second end of the capacitor series circuit 106; the second discharging circuit 114 includes a second switch Q2, a source of the second switch Q2 is connected with the second end of the capacitor series circuit 106, and a drain of the second switch Q2 is connected with the second end of the second voltage divider circuit 110; wherein, when the voltage at the first end of the second resistor R2 is greater than the second voltage and the first difference is greater than or equal to the on-voltage of the first switch Q1, the first switch Q1 is turned on; when the voltage at the first end of the second resistor R2 is greater than the second voltage and the first difference is less than the on-voltage of the first switch Q1, the first switch Q1 is turned off; when the voltage at the first end of the second resistor R2 is less than the second voltage and the first difference is greater than or equal to the on-voltage of the second switch Q2, the second switch Q2 is turned on; when the voltage at the first end of the second resistor R2 is less than the second voltage and the first difference is less than the on-voltage of the second switch Q2, the second switch Q2 is turned off; the first difference is the voltage difference between the voltage at the first end of the second resistor R2 and the second voltage.

[0074] In this embodiment, according to the connection relationship of the first switch Q1, the second switch Q2, the first high-frequency switch bridge arm 102, the second high-frequency switch bridge arm 104, the first energy storage component 1062 and the second energy storage component 1064, it can be seen that the first position M corresponding to the second voltage can be regarded as the midpoint position of the first energy storage component 1062 and the second energy storage component 1064, and at this time, the voltage at the first position can be regarded as the midpoint voltage of the first energy storage component 1062 and the second energy storage component 1064.

[0075] At this time, the voltage between the voltage at the first end of the second resistor R2 and the second voltage can represent the voltage equalization of the first voltage divider circuit 108 and the second voltage divider circuit 110 to the first energy storage component 1062 and the second energy storage component 1064, and the voltage difference between the two, that is, the first difference, can represent the degree of voltage imbalance. When the voltage at the first end of the second resistor R2 is greater than the second voltage and the first difference is greater than or equal to the on-voltage of the first switch Q1, it is considered that the voltage across the first energy storage component 1062 is greater than the voltage across the second energy storage component 1064, and by controlling the first switch Q1 to be turned on, the voltage on the first energy storage component 1062 can be discharged through the first switch Q1. With the first switch Q1 turned on, the voltage across the first energy storage component 1062 decreases until the voltage across the first energy storage component 1062 and the voltage across the second energy storage component 1064 are close, that is, the difference between the two voltages is less than the threshold value of the switch, that is, the on-voltage of the first switch Q1, and the first switch Q1 is turned off.

[0076] Similarly, in the case that the voltage at the first end of the second resistor R2 is less than the second voltage, and the first difference is greater than or equal to the on-voltage of the second switch Q2, it is considered that the voltage across the first energy storage component 1062 is less than the voltage across the second energy storage component 1064. By controlling the second switch Q2 to be on, the voltage on the second energy storage component 1064 can be discharged through the second switch Q2. As the second switch Q2 is on, the voltage across the second energy storage component 1064 decreases until the voltage across the first energy storage component 1062 is close to the voltage across the second energy storage component 1064, i.e., the difference between the voltages is less than the threshold of the switch, i.e., the on-voltage of the second switch Q2. In this case, the second switch Q2 is off.

[0077] In this process, the first switch Q1 and the second switch Q2 are self-driven, have fast response speed, and are relatively simple to control, thereby improving the efficiency and rate of capacitor voltage sharing.

[0078] In the above embodiments, the gate is denoted as G, the source is denoted as S, and the drain is denoted as D.

[0079] In addition, even if the resistances in the first voltage dividing circuit 108 and the second voltage dividing circuit 110 are different, the voltage sharing of the first energy storage component 1062 and the second energy storage component 1064 in series is not affected, and it can be ensured that the voltage difference between the first energy storage component 1062 and the second energy storage component 1064 is within a certain range of difference, thereby avoiding capacitor overvoltage failure in the case of switch failure and increasing system safety.

[0080] In some embodiments, optionally, the first discharging circuit 112 further includes a first voltage sharing resistor ZR1 connected in series between the drain of the first switch Q1 and the first end of the first voltage dividing circuit 108; and / or the second discharging circuit 114 further includes a second voltage sharing resistor ZR2 connected in series between the drain of the second switch Q2 and the second end of the second voltage dividing circuit 110.

[0081] In this embodiment, the first voltage sharing resistor ZR1 and the second voltage sharing resistor ZR2 can accelerate the voltage sharing rate of the first switch Q1 and the second switch Q2, thereby improving the efficiency and rate of capacitor voltage sharing.

[0082] In the above embodiments, the first voltage sharing resistor ZR1 and the second voltage sharing resistor ZR2 can be valued according to actual use needs, and specific values are not described herein.

[0083] In the above embodiment, the first voltage equalization resistor ZR1 and the second voltage equalization resistor ZR2 play the role of fast voltage equalization, and the capacitor voltage is lowered by discharging through the resistor, and the capacitor is consumed by the resistor, forcing the capacitor voltage to drop. The time of equalizing the voltage of the two capacitors in series is related to the resistance value of the voltage equalization resistor, the capacitance value of the capacitor, and the deviation of the two capacitors. When the voltage difference of the two capacitors in series exceeds the threshold value of the switch tube conduction, such as the typical value of 5V, the switch tube is turned on, providing a complete circuit for discharging the voltage equalization resistor, and the voltage of the capacitor is lowered. When the voltage difference between the two ends of the capacitor is within the threshold value of the switch tube, the switch tube is turned off, and the resistor does not work. At this time, the power consumption of the capacitor parallel resistor can be reduced.

[0084] Exemplarily, when the voltage across the first energy storage component 1062 is 410V, the voltage across the second energy storage component 1064 is 390V, the voltage at point M is 390V, the voltage at point N is 400V, and the voltage Vnm is 10V, i.e. the voltage across the first voltage stabilizing tube ZD1 is 10V, the first switch tube Q1 is turned on, the second switch tube Q2 is turned off, the capacitor is discharged through the first voltage equalization resistor ZR1, the voltage of the first energy storage component 1062 is lowered, and the voltage of the second energy storage component 1064 is raised until the absolute value of the voltage difference between the first energy storage component 1062 and the second energy storage component 1064 is less than 5V.

[0085] The voltage at point M is 400V, the voltage at point N is 390V, and the voltage Vmn is 10V, i.e. the voltage across the second voltage stabilizing tube ZD2 is 10V, the first switch tube Q1 is turned off, the second switch tube Q2 is turned on, the capacitor is discharged through the second voltage equalization resistor ZR2, the voltage of the first energy storage component 1062 is raised, and the voltage of the second energy storage component 1064 is lowered until the absolute value of the voltage difference between the first energy storage component 1062 and the second energy storage component 1064 is less than 5V.

[0086] Wherein, point M is the first position corresponding to the second voltage, point N is the first end of the second resistor R2, which is half of the voltage of the first energy storage component 1062 and the second energy storage component 1064 in series, and Vmn is the first difference.

[0087] In normal steady state, since the first voltage dividing circuit 108 and the second voltage dividing circuit 110 have the same resistance, the voltages of the first energy storage component 1062 and the second energy storage component 1064 are the same.

[0088] In some embodiments, optionally, the first high-frequency switching bridge arm 102 includes a first rectifier circuit 1022 and a first switching circuit 1024; a first transformer T1, the primary coil of the first transformer T1 being connected to the output terminal of the first switching circuit 1024, and the secondary coil of the first transformer T1 being connected to the input terminal of the first rectifier circuit 1022; the second high-frequency switching bridge arm 104 includes a second rectifier circuit 1042 and a second switching circuit 1044; a second transformer T2, the primary coil of the second transformer T2 being connected to the output terminal of the second switching circuit 1044, and the secondary coil of the second transformer T2 being connected to the input terminal of the second rectifier circuit 1042.

[0089] In this embodiment, the first switching circuit 1024 and the second switching circuit 1044 can switch the transistors and use the first transformer T1 and the second transformer T2 for high-frequency isolation to supply power to the first rectifier circuit 1022 and the second rectifier circuit 1042.

[0090] The first rectifier circuit 1022 and the second rectifier circuit 1042 can be full-wave rectification or half-wave rectification.

[0091] Specifically, the first rectifier circuit 1022 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, and the second rectifier circuit 1042 includes a fifth diode D5, a sixth diode D6, a seventh diode D7, and an eighth diode D8.

[0092] In some embodiments, the first switch Q1 may be a high-voltage NPN switch and the second switch Q2 may be a high-voltage PNP switch.

[0093] In one embodiment, such as Figure 3 As shown, the drive control circuit includes a bridge rectifier circuit 202, a capacitor series circuit module 204, a capacitor voltage sampling circuit 206, and a voltage equalization drive circuit module 208.

[0094] Among them, the bridge rectifier circuit 202 is also the first high-frequency switch bridge arm 102 and the second high-frequency switch bridge arm 104 in this application; the capacitor series circuit module 204 is also the capacitor series circuit 106, the first voltage divider circuit 108 and the second voltage divider circuit 110; the capacitor voltage sampling circuit 206 is also the voltage detection circuit 116 in this application; and the voltage equalization drive circuit module 208 is also the voltage equalization drive circuit 118.

[0095] In one embodiment, the present invention provides an inverter, including a drive control circuit as described above.

[0096] In one of the embodiments, the utility model provides a kind of energy storage equipment, comprising: the drive control circuit of any one in above described;Or as above described inverter.

[0097] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the literal description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0098] In the literal description of the utility model, it can be understood that, except for explicit provisions and limitations, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through intermediate medium;It can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0099] In the claims, description and drawings of the specification of the utility model, the description of the terms "one embodiment", "some embodiments", "specific embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the claims, description and drawings of the specification of the utility model, the illustrative expression of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0100] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A drive control circuit, characterized by comprising: Comprise: a first high-frequency switching bridge arm; a second high-frequency switching bridge arm; a capacitor series circuit, a first end of the capacitor series circuit is connected with a first end of the first high-frequency switching bridge arm, a second end of the capacitor series circuit is connected with a second end of the first high-frequency switching bridge arm and a first end of the second high-frequency switching bridge arm respectively, and a third end of the capacitor series circuit is connected with a second end of the second high-frequency switching bridge arm; a first voltage dividing circuit, a first end of the first voltage dividing circuit is connected with the first end of the capacitor series circuit, and a second end of the first voltage dividing circuit is connected with the second end of the capacitor series circuit; a second voltage dividing circuit, a first end of the second voltage dividing circuit is connected with the second end of the capacitor series circuit, and a second end of the second voltage dividing circuit is connected with the third end of the capacitor series circuit; a first discharging circuit, a first end of the first discharging circuit is connected with the first end of the first voltage dividing circuit, and a second end of the first discharging circuit is connected with the second end of the capacitor series circuit; a second discharging circuit, a first end of the second discharging circuit is connected with the second end of the capacitor series circuit, and a second end of the second discharging circuit is connected with the second end of the second voltage dividing circuit; a voltage detection circuit, a first end of the voltage detection circuit is connected with the first end of the first voltage dividing circuit, and a second end of the voltage detection circuit is connected with the second end of the second voltage dividing circuit; a voltage equalization driving circuit, a first end of the voltage equalization driving circuit is connected with an output end of the voltage detection circuit, a control end of the first discharging circuit and a control end of the second discharging circuit respectively, a second end of the voltage equalization driving circuit is connected with the second end of the capacitor series circuit, and the voltage equalization driving circuit drives the first discharging circuit and the second discharging circuit to discharge according to a first voltage at the output end of the voltage detection circuit and a second voltage at the second end of the capacitor series circuit.

2. The drive control circuit according to claim 1, characterized by The capacitor series circuit comprises: a first energy storage component, a first end of the first energy storage component is connected with the first end of the first high-frequency switching bridge arm, and a second end of the first energy storage component is connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively; a second energy storage component, a first end of the second energy storage component is connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively, and a second end of the second energy storage component is connected with the second end of the second high-frequency switching bridge arm.

3. The drive control circuit according to claim 2, characterized by The first energy storage component comprises: a first electrolytic capacitor, a first end of the first electrolytic capacitor is connected with the first end of the first high-frequency switching bridge arm, and a second end of the first electrolytic capacitor is connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively; and / or a first capacitor, a first end of the first capacitor is connected with the first end of the first high-frequency switching bridge arm, and a second end of the first capacitor is connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively; The second energy storage component comprises: a second electrolytic capacitor, first ends of the second electrolytic capacitor are connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively, and a second end of the second electrolytic capacitor is connected with the second end of the second high-frequency switching bridge arm; and / or a second capacitor, first ends of the second capacitor are connected with the second end of the first high-frequency switching bridge arm and the first end of the second high-frequency switching bridge arm respectively, and a second end of the second capacitor is connected with the second end of the second high-frequency switching bridge arm.

4. The drive control circuit according to claim 1, characterized by The voltage detection circuit comprises: a first resistor, a first end of the first resistor is connected with the first end of the first voltage dividing circuit; a second resistor, a first end of the second resistor is connected with a second end of the first resistor, a second end of the second resistor is connected with a second end of the second voltage dividing circuit, and the first end of the second resistor is connected with a first end of the voltage equalization driving circuit.

5. The drive control circuit according to claim 4, characterized by The voltage equalization driving circuit comprises: a third resistor, a first end of the third resistor is connected with an output end of the voltage detection circuit and a control end of the first discharging circuit respectively, and a second end of the third resistor is connected with a second end of the capacitor series connection circuit; a fourth resistor, a first end of the fourth resistor is connected with the second end of the capacitor series connection circuit, and a second end of the fourth resistor is connected with the output end of the voltage detection circuit and a control end of the second discharging circuit respectively.

6. The drive control circuit according to claim 5, characterized by The voltage equalization driving circuit further comprises: a first stabilizing tube, a first end of the first stabilizing tube is connected with the control end of the first discharging circuit, and a second end of the first stabilizing tube is connected with the second end of the capacitor series connection circuit; and / or a second stabilizing tube, a first end of the second stabilizing tube is connected with the second end of the capacitor series connection circuit, and a second end of the second stabilizing tube is connected with the control end of the second discharging circuit.

7. The drive control circuit according to claim 5, wherein The first discharging circuit comprises: a first switch tube, a drain of the first switch tube is connected with the first end of the first voltage dividing circuit, and a source of the first switch tube is connected with the second end of the capacitor series connection circuit; The second discharging circuit comprises: a second switch tube, a source of the second switch tube is connected with the second end of the capacitor series connection circuit, and a drain of the second switch tube is connected with the second end of the second voltage dividing circuit; wherein, the first switch tube is turned on based on the voltage at the first end of the second resistor being greater than the second voltage and the first difference being greater than or equal to a turn-on voltage of the first switch tube; the first switch tube is turned off based on the voltage at the first end of the second resistor being greater than the second voltage and the first difference being less than the turn-on voltage of the first switch tube; the second switch tube is turned on based on the voltage at the first end of the second resistor being less than the second voltage and the first difference being greater than or equal to a turn-on voltage of the second switch tube; the second switch tube is turned off based on the voltage at the first end of the second resistor being less than the second voltage and the first difference being less than the turn-on voltage of the second switch tube; the first difference is a voltage difference between the voltage at the first end of the second resistor and the second voltage.

8. The drive control circuit according to claim 7, characterized by The first discharging circuit further comprises: a first voltage-sharing resistor connected in series between the drain of the first switch tube and a first terminal of the first voltage-dividing circuit; and / or The second discharging circuit further comprises: a second voltage-sharing resistor connected in series between the drain of the second switch tube and a second terminal of the second voltage-dividing circuit.

9. An inverter, characterized by comprising: Comprising: The drive control circuit according to any one of claims 1 to 8.

10. An energy storage device, characterized by, Comprising: The drive control circuit according to any one of claims 1 to 8; Or The inverter according to claim 9.

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