Alternating current and direct current power supply input switching circuit and energy storage converter
By designing an AC-DC power input switching circuit in an energy storage converter, and using crystal electronic switch tubes and optocouplers to achieve priority AC power input, the difficulty and high cost of selecting traditional switching circuit devices is solved, and device losses are reduced.
Patent Information
- Application Number
- CN202421537727.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The device selection of AC-DC power-taking switching circuits in energy storage converters is difficult to select, has high cost, and has a large loss in high input voltage scenarios.
An AC-DC power input switching circuit is designed, using crystal electronic switch tubes and optocouplers as switch switching circuits, and priority AC power input power supply is achieved through the switch control circuit to avoid DC battery discharge.
It realizes priority utilization of AC power input in energy storage converters, reduces device losses and costs, and solves the problem of difficulty in selecting traditional switching circuit devices.
Smart Images
Figure CN222868587U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of energy storage converter control, and in particular to an AC / DC power supply input switching circuit and an energy storage converter. Background Art
[0002] In the energy storage industry, the "black start" function has become a relatively basic function of energy storage inverters. Its essence is to use the battery voltage of the DC input of the energy storage inverter as a power source to generate the control power inside the energy storage inverter. At present, the mainstream power supply method in the industry is that the control power of the energy storage inverter adopts AC and DC power supply methods, that is, when there is power on the AC power supply side or the DC power supply side, the control power of the energy storage inverter can be powered on; when both have power, the AC side is given priority to avoid battery discharge.
[0003] Traditional AC and DC power switching switches use relays as switching switches or diodes to switch between the AC and DC input voltages. Since the input voltage in the energy storage industry is usually around 1500V, it will cause large losses in switching circuit components such as relays or diodes, making component selection difficult and costly. Utility Model Content
[0004] The main purpose of the utility model is to provide an AC / DC power input switching circuit and an energy storage converter, aiming to solve the problem of difficult selection of circuit components and high cost in the energy storage converter control power supply scheme.
[0005] To achieve the above objectives, this application provides the following technical solutions:
[0006] In a first aspect, an AC / DC power input switching circuit is provided, comprising:
[0007] An AC power input circuit, the AC power input circuit comprising an input rectification unit and a first filtering unit;
[0008] A DC power input circuit, wherein an output end of the DC power input circuit is connected in parallel with an output end of the AC power input circuit;
[0009] A switch switching circuit, wherein the switch switching circuit comprises a crystal electronic switch tube Q1, wherein the crystal electronic switch tube is connected in series to the output end of the DC power input circuit, and the control end of the crystal electronic switch tube Q1 is connected to the output end of the AC power input circuit and the output end of the DC power input circuit respectively;
[0010] A switch control circuit is connected to the AC power input circuit and the switch switching circuit respectively to control the switching on and off of the switch switching circuit.
[0011] Optionally, an AC / DC power input switching circuit further includes an AC power input detection unit;
[0012] The switch control circuit comprises an optical coupler U1, the primary side of the optical coupler U1 is connected to the AC power input detection unit, and the secondary side of the optical coupler U1 is connected in parallel to the control end of the crystal electronic switch tube Q1;
[0013] Optionally, the control end of the crystal electronic switch tube Q1 is connected to the positive common output end of the output end of the AC power input circuit and the output end of the DC power input circuit through a series resistor R12.
[0014] Optionally, the AC power input detection unit includes a DC power converter, the output end of the DC power converter is connected to the primary input end of the optocoupler U1, and the input end of the DC power converter is connected to the output end of the first filtering unit.
[0015] Optionally, the AC power input detection unit includes an AC online monitoring unit circuit and a control unit U10, the input end of the AC online monitoring unit circuit is connected in parallel with the input end of the AC power input detection circuit, and the output end of the AC online monitoring unit circuit is connected to the input end of the control unit U10; the primary input end of the optocoupler U1 is connected to the output end of the control unit U10.
[0016] Optionally, the switch circuit includes a voltage stabilizing diode Z1 and a resistor R10, and the voltage stabilizing diode Z1 and the resistor R10 are respectively connected in parallel to the secondary output end of the optical coupler U1.
[0017] Optionally, the switch switching circuit further includes a resistor R13, and the resistor R13 is connected in series to the secondary output end of the optocoupler U1 and the control end of the crystal electronic switch tube Q1.
[0018] Optionally, the AC power input circuit further includes an anti-backflow diode, and the anti-backflow diode is connected in series to the output end of the first filtering unit;
[0019] The DC power input circuit comprises a second filtering unit, and an anti-backflow diode is connected in series between an input end of the second filtering unit and an input end of the DC power input circuit.
[0020] Optionally, the AC / DC power input switching circuit includes two groups of switch switching circuits, and the switch control circuit includes two optocouplers;
[0021] The two groups of switch switching circuits are connected in series to the output end of the DC power input circuit;
[0022] Each group of the switch switching circuits is respectively connected to a secondary output terminal of the optocoupler, and the primary sides of the two optocouplers in the switch control circuit are connected in series.
[0023] Optionally, the DC power input circuit includes a plurality of groups of DC power input units, and the output end of each group of DC power input units is connected in parallel to the input end of the second filtering unit.
[0024] In the second aspect, the utility model also provides an energy storage inverter, including an auxiliary power supply module, a DC bus module and an AC / DC power supply input switching circuit as described in the first aspect; the output end of the AC / DC power supply input switching circuit is connected to the input end of the auxiliary power supply module to provide energy for the auxiliary power supply module.
[0025] Optionally, when the DC power input circuit includes multiple groups of DC power input units, the input end of one group of the DC power input units is connected to the DC bus module of the energy storage inverter, and the input end of another group of the DC power input units is connected to a DC energy storage device outside the energy storage inverter.
[0026] The utility model has at least the following technical benefits:
[0027] Compared with the existing AC / DC power input circuit, the AC / DC power input switching circuit provided by the utility model realizes priority of AC power input power supply under the premise of reliable power supply of the auxiliary power supply of the energy storage inverter through the switch switching circuit, thereby avoiding the difficulty in selecting AC and DC power switching circuit components and high cost problems in high input voltage power supply scenarios such as energy storage inverters.
[0028] At the same time, the AC / DC power input switching circuit and energy storage converter provided by the utility model include a solution of multiple groups of DC power inputs, which can accelerate the discharge of the bus capacitor of the energy storage converter and provide power supply for the energy storage converter with power-off preservation function when the AC and DC power are simultaneously lost. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 A structural block diagram of an AC / DC power input switching circuit provided in an embodiment of the present application;
[0030] Figure 2 A schematic diagram of the principle of an AC / DC power input switching circuit provided in an embodiment of the present application;
[0031] Figure 3 Another structural block diagram of the AC / DC power input switching circuit provided in an embodiment of the present application;
[0032] Figure 4 Another schematic diagram of the principle of the AC / DC power input switching circuit provided in the embodiment of the present application;
[0033] Figure 5 Another schematic diagram of the principle of the AC / DC power input switching circuit provided in the embodiment of the present application;
[0034] Figure 6 Another schematic diagram of the principle of the AC / DC power input switching circuit provided in the embodiment of the present application;
[0035] Figure 7 Another schematic diagram of the principle of the AC / DC power input switching circuit provided in the embodiment of the present application;
[0036] Figure 8 A structural block diagram of the energy storage converter provided in this embodiment application;
[0037] Fig. 9 A schematic diagram of the structure of another energy storage converter provided in this embodiment application. DETAILED DESCRIPTION
[0038] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0039] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0040] In this application, the term "comprises", "includes" or any other variation thereof is intended to cover non-exclusive inclusion, so that a device or system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a device or system. In the absence of more restrictions, an element defined by the sentence "includes..." does not exclude the presence of other identical elements in the device or system including the element.
[0041] like Figure 1 , Figure 2 As shown, an embodiment of the present application provides an AC / DC power input switching circuit, the circuit comprising:
[0042] An AC power input circuit 10, wherein the AC power input circuit 10 comprises an input rectifying unit 101 and a first filtering unit 102;
[0043] A DC power input circuit 20, wherein the output end of the DC power input circuit 20 is connected in parallel with the output end of the AC power input circuit 10;
[0044] A switch switching circuit 30, wherein the switch switching circuit comprises a crystal electronic switch tube Q1, wherein the crystal electronic switch tube is connected in series to the output end of the DC power input circuit 20, and the control end of the crystal electronic switch tube Q1 is connected to the output end of the AC power input circuit 10 and the output end of the DC power input circuit 20 respectively;
[0045] The switch control circuit 40 is connected to the AC power input circuit 10 and the switch switching circuit 30 respectively to control the opening and closing of the switch switching circuit.
[0046] The AC / DC power input switching circuit provided in the embodiment of the present application has an AC power input circuit 10 whose input end is connected to an AC voltage, and the AC voltage is converted into an output DC voltage A after passing through an input rectifying unit 101 and a first filtering unit 102; an input end of a DC power input circuit 20 is connected to a DC power output DC voltage B; an output end of the DC power input circuit 20 is connected in parallel with an output end of the AC power input circuit 10 to a DC output end DC_OUT of the AC / DC power input switching circuit, specifically, that is: the positive end of the output DC voltage A and the positive end of the output DC voltage B are both connected to the positive end of the DC output end DC_OUT of the AC / DC power input switching circuit, and the negative end of the output DC voltage A and the negative end of the output DC voltage B are both connected to the negative end of the DC output end DC_OUT of the AC / DC power input switching circuit; a crystal electronic switch tube Q1 of a switch switching circuit 30 is connected in series between the negative pole of the output end of the DC power input circuit 20 and the DC output end DC_OUT- of the AC / DC power input switching circuit.
[0047] Optionally, the crystal electronic switch tube Q1 is an IGBT tube or a MOS tube. When the IGBT tube is selected, the collector and emitter of the IGBT tube are connected in series between the output end of the DC power input circuit 20 and the DC output end DC_OUT of the AC / DC power input switching circuit; when the MOS tube is selected, the source and drain of the MOS tube are connected in series between the output end of the DC power input circuit 20 and the DC output end DC_OUT of the AC / DC power input switching circuit; the control end (gate) of the crystal electronic switch tube Q1 is respectively connected to the positive end of the output end of the DC power input circuit 20 and the positive end of the output end of the AC power input circuit 10.
[0048] When only the AC power input circuit 10 has voltage, the DC voltage A can be directly output and delivered to the DC output terminal DC_OUT of the AC / DC power input switching circuit; when only the DC power input circuit 20 has voltage, the control end gate of the crystal electronic switch tube Q1 is charged and then turned on, and the output DC voltage B is delivered to the DC output terminal DC_OUT of the AC / DC power input switching circuit.
[0049] The output end of the switch control circuit 40 is connected to the control end (gate) of the crystal electronic switch tube Q1 to control the on and off of the crystal electronic switch tube Q1, thereby realizing the on and off of the switch switching circuit.
[0050] When both the AC power input circuit 10 and the DC power input circuit 20 have voltage, the switch control circuit 40 controls the crystal electronic switch tube Q1 to turn off, thereby blocking the DC voltage B from being transmitted to the DC output terminal DC_OUT of the AC / DC power input switching circuit. At this time, only the DC voltage A is transmitted to the DC output terminal DC_OUT of the AC / DC power input switching circuit.
[0051] The AC / DC power input switching circuit provided in the embodiment of the present application reliably implements the AC power priority solution through the switch switching circuit 30 with the crystal electronic switch tube Q1, which can solve the problem of difficult device selection and high cost in traditional AC and DC power supply solutions.
[0052] Based on Figure 1 , Figure 2 In an optional embodiment of the embodiment shown, the AC / DC power input switching circuit further includes an AC power input detection unit 50, such as Figure 3 shown.
[0053] The switch control circuit 40 includes an optical coupler U1 , wherein the primary side of the optical coupler U1 is connected to the AC power input detection unit 50 , and the secondary side of the optical coupler U1 is connected in parallel to the control end of the crystal electronic switch tube Q1 .
[0054] The AC power input detection unit 50 detects whether the AC power input circuit 10 has a voltage output. If it is detected that the AC power input circuit 10 has a voltage, the AC power input detection unit 50 outputs a voltage signal to control the optocoupler U1 to be turned on, and the control end driving voltage of the crystal electronic switch tube Q1 is pulled down, and the crystal electronic switch tube Q1 is turned off. At this time, no matter whether the DC power input circuit 20 has a voltage output, only the AC power input circuit supplies power to the DC output terminal DC_OUT of the AC / DC power input switching circuit, thereby achieving the purpose of giving priority to AC power.
[0055] Optional, such as Figure 2As shown, the control end of the crystal electronic switch tube Q1 is connected to the positive common output end DC_OUT+ of the output end of the AC power input circuit 10 and the output end of the DC power input circuit 20 through a series resistor R12.
[0056] The voltage at the output end of the AC power input circuit 10 and / or the output end of the DC power input circuit 20 can be charged to the control end of the crystal electronic switch tube Q1 through the series resistor R12. When the charging voltage reaches the turn-on voltage of the crystal electronic switch tube Q1, the crystal electronic switch tube Q1 is turned on.
[0057] Optionally, the switch circuit 30 includes a voltage regulator diode Z1 and a resistor R10 , and the voltage regulator diode Z1 and the resistor R10 are respectively connected in parallel to the secondary output terminal of the optocoupler U1 .
[0058] The voltage stabilizing diode Z1 can provide voltage clamping for the control-end gate of the crystal electronic switch tube Q1 to protect the crystal electronic switch tube Q1. The resistor R10 is a voltage dividing resistor to provide voltage division for the control-end gate of the crystal electronic switch tube Q1.
[0059] Optional, such as Figure 1 , Figure 2 As shown, the switch circuit 30 further includes a resistor R13, which is connected in series to the secondary output terminal of the optical coupler U1 and the control terminal of the crystal electronic switch tube Q1.
[0060] The resistor R13 is a current limiting resistor, which limits the discharge current when the control end (gate) of the crystal electronic switch tube Q1 is turned off, and plays a role in protecting the secondary side of the optocoupler U1.
[0061] Optional, such as Figure 1 , Figure 2 As shown, the AC power input circuit 10 also includes anti-backflow diodes D5 and D6, and the anti-backflow diodes D5 and D6 are connected in series to the output end of the first filtering unit 102; the backflow diode D5 is connected in series between the positive output end of the first filtering unit 102 and the positive common output end DC_OUT+, and the backflow diode D6 is connected in series between the negative output end of the first filtering unit 102 and the DC output end DC_OUT- of the negative AC / DC power input switching circuit; the backflow diodes D5 and D6 can prevent the voltage at the DC output end DC_OUT of the AC / DC power input switching circuit from backflowing to the AC power input circuit 10.
[0062] The DC power input circuit 20 includes a second filtering unit 202, and anti-backflow diodes D7 and D8 are connected in series between the input end of the second filtering unit 202 and the input end of the DC power input circuit 20; the backflow diode D7 is connected in series between the positive input end of the DC power input circuit 20 and the positive input end of the second filtering unit 202, and the backflow diode D8 is connected in series between the negative input end of the DC power input circuit 20 and the negative input end of the second filtering unit 202; the anti-backflow diodes D7 and D8 can prevent the voltage at the DC output end DC_OUT of the AC / DC power input switching circuit from backflowing to the input end of the DC power input circuit 20, and can also prevent the circuit from being damaged due to the voltage polarity of the input end of the DC power input circuit 20 being mistakenly connected in reverse.
[0063] Based on Figure 1 , Figure 2 In an alternative embodiment of the embodiment shown, the AC power input detection unit 50 includes a DC power converter 501, such as Figure 4 The output end of the DC power converter 501 is connected to the primary input end of the optical coupler U1 , and the input end of the DC power converter 501 is connected to the output end of the first filtering unit 102 .
[0064] The DC power converter 501 converts the high voltage electricity at the output end of the first filtering unit 102 into a low voltage DC voltage to control the on and off of the optocoupler U1; when the AC power input circuit 10 has an input AC voltage, the DC power converter 501 outputs a low voltage DC voltage to control the optocoupler U1 to turn on, and the crystal electronic switch tube Q1 is turned off, blocking the DC voltage B of the DC power input circuit 20 from being transmitted to the DC output terminal DC_OUT of the AC / DC power input switching circuit, thereby realizing priority AC power supply.
[0065] In the AC / DC power input switching circuit provided in the embodiment of the present application, since the primary and secondary sides of the optocoupler U1 are connected to low voltages obtained after processing, the optocoupler selection is relatively easy to choose.
[0066] Based on Figure 1 , Figure 2 In an optional embodiment of the embodiment shown, the AC power input detection unit 50 includes an AC online monitoring unit circuit 502, a control unit U10, such as Figure 5 The input end of the AC online monitoring unit circuit 502 is connected in parallel with the input end of the AC power input circuit 10, the output end of the AC online monitoring unit circuit 502 is connected to the input end of the control unit U10; the primary input end of the optical coupler U1 is connected to the output end of the control unit U10.
[0067] The specific solution of the AC online monitoring unit circuit 502 is a general technology, and the specific technical solution will not be repeated here.
[0068] Optionally, the control unit U10 may be an editable control chip such as CPU, FPGA, ARM, CPLD, etc.
[0069] The AC online monitoring unit circuit 502 detects the input voltage of the AC power input circuit 10 and outputs a signal ACS to the control unit U10. The control unit U10 can determine whether there is voltage supply at the input end of the AC power input circuit 10 based on the output signal ACS, and send a control signal to control the opening and closing of the optocoupler U1 to achieve the purpose of priority AC power supply.
[0070] Optional, such as Figure 6 As shown, the AC / DC power input switching circuit includes two groups of switch switching circuits, and the switch control circuit 40 includes two optocouplers U1A and U1B; the two groups of switch switching circuits 30 are connected in series to the output end of the DC power input circuit, wherein each group of switch switching circuits 30 is respectively connected to the secondary output end of an optocoupler, that is, the switch switching circuit 30A is connected to the secondary output end of the optocoupler U1A, and the switch switching circuit 30B is connected to the secondary output end of the optocoupler U1B; the primary sides of the two optocouplers U1A and U1B in the switch control circuit 40 are connected in series.
[0071] The crystal electronic switch tubes in the two sets of switch switching circuits are connected in series, such as Figure 6 As shown, taking the crystal electronic switch tube as a MOS tube as an example, the collectors and emitters of the crystal electronic switch tubes Q1A and Q1B of the two sets of switch switching circuits 30A and 30B are connected in series in sequence, so that the voltage stress between the collector and the emitter of each crystal electronic switch tube can be halved, further reducing the difficulty of device selection and reducing costs.
[0072] Based on Figure 1 , Figure 2 In an optional embodiment of the embodiment shown, the DC power input circuit includes multiple groups of DC power input units 206, such as Figure 7 As shown, the output end of each group of DC power input units 206 is connected in parallel to the input end of the second filtering unit 202 .
[0073] Among them, the DC power input DC1+ and DC power input DC1- constitute the first group of DC power input units, the DC power input DC2+ and DC power input DC2- constitute the second group of DC power input units, and the DC power input DCN+ and DC power input DCN- constitute the Nth group of DC power input units, and the DC power input DC1+, DC power input DC2+, and DC power input DCN+ are connected to the positive input terminal of the second filtering unit 202; the DC power input DC1-, DC power input DC2-, and DC power input DCN- are connected to the negative input terminal of the second filtering unit 202. Multiple groups of DC input units 206, the input terminal of each group of DC input units can be connected to different DC power supplies for power supply, so that the redundancy of the DC input power source can be achieved, and the reliability of the power supply of this power supply can be increased.
[0074] The present application also provides an energy storage converter 100, such as Figure 8 As shown, it includes an auxiliary power supply module 02, a DC bus module 03 and the AC / DC power supply input switching circuit 01 as described above; the output end of the AC / DC power supply input switching circuit 01 is connected to the input end of the auxiliary power supply module 02 to provide energy for the auxiliary power supply module 02.
[0075] The DC output terminal DC_OUT of the AC / DC power input switching circuit 01 is connected to the input terminal of the auxiliary power module 02 .
[0076] Optionally, when the DC power input circuit includes multiple groups of DC power input units, the input end of one group of the DC power input units is connected to the DC bus module of the energy storage inverter, and the input end of another group of the DC power input units is connected to a DC energy storage device outside the energy storage inverter.
[0077] like Fig. 9 As shown, a DC power input circuit includes two groups of DC power input units as an example, wherein the input end of one group of the DC power input units is connected to the DC bus module 03 of the energy storage inverter, and the input end of the other group of the DC power input units is connected to the DC energy storage device B01 outside the energy storage inverter.
[0078] When the energy storage converter is powered off for maintenance, the auxiliary power supply can consume the energy in the DC bus module 03, shorten the discharge time of the energy storage converter, and provide the energy storage converter with power supply for power-off preservation function.
[0079] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. An AC / DC power input switching circuit, characterized in that: include: An AC power input circuit, the AC power input circuit comprising an input rectification unit and a first filtering unit; A DC power input circuit, wherein an output end of the DC power input circuit is connected in parallel with an output end of the AC power input circuit; A switch switching circuit, wherein the switch switching circuit comprises a crystal electronic switch tube Q1, wherein the crystal electronic switch tube Q1 is connected in series to the output end of the DC power input circuit, and the control end of the crystal electronic switch tube Q1 is connected to the output end of the AC power input circuit and the output end of the DC power input circuit respectively; A switch control circuit is connected to the AC power input circuit and the switch switching circuit respectively to control the switching on and off of the switch switching circuit.
2. The AC / DC power input switching circuit according to claim 1, characterized in that: Also includes an AC power input detection unit; The switch control circuit comprises an optocoupler U1 , the primary side of the optocoupler U1 is connected to the AC power input detection unit, and the secondary side of the optocoupler U1 is connected in parallel to the control end of the crystal electronic switch tube Q1 .
3. The AC / DC power input switching circuit according to claim 1, characterized in that: The control end of the crystal electronic switch tube Q1 is connected to the positive common output end of the output end of the AC power input circuit and the output end of the DC power input circuit through a series resistor R12.
4. The AC / DC power input switching circuit according to claim 2, characterized in that: The AC power input detection unit includes a DC power converter, the output end of the DC power converter is connected to the primary input end of the optical coupler U1, and the input end of the DC power converter is connected to the output end of the first filtering unit.
5. The AC / DC power input switching circuit according to claim 2, characterized in that: The AC power input detection unit includes an AC online monitoring unit circuit and a control unit U10; The input end of the AC online monitoring unit circuit is connected in parallel with the input end of the AC power input circuit, and the output end of the AC online monitoring unit circuit is connected to the input end of the control unit U10; The primary input terminal of the optical coupler U1 is connected to the output terminal of the control unit U10.
6. The AC / DC power input switching circuit according to claim 2, characterized in that: The switch circuit includes a voltage stabilizing diode Z1 and a resistor R10 , and the voltage stabilizing diode Z1 and the resistor R10 are respectively connected in parallel to the secondary output end of the optical coupler U1 .
7. The AC / DC power input switching circuit according to claim 2, characterized in that: The switch switching circuit further includes a resistor R13, and the resistor R13 is connected in series to the secondary output end of the optical coupler U1 and the control end of the crystal electronic switch tube Q1.
8. The AC / DC power input switching circuit according to claim 1, characterized in that: The AC power input circuit further includes an anti-backflow diode, and the anti-backflow diode is connected in series to the output end of the first filtering unit; The DC power input circuit comprises a second filtering unit, and an anti-backflow diode is connected in series between an input end of the second filtering unit and an input end of the DC power input circuit.
9. The AC / DC power input switching circuit according to claim 2, characterized in that: The AC / DC power input switching circuit includes two groups of switch switching circuits, and the switch control circuit includes two optical couplers; The two groups of switch switching circuits are connected in series to the output end of the DC power input circuit; Wherein, each group of the switch switching circuits is respectively connected to the secondary output terminal of one of the optocouplers, and the primary sides of the two optocouplers in the switch control circuit are connected in series.
10. The AC / DC power input switching circuit according to claim 8, characterized in that: The DC power input circuit includes a plurality of groups of DC power input units, and the output end of each group of DC power input units is connected in parallel to the input end of the second filtering unit.
11. An energy storage converter, characterized in that: It comprises an auxiliary power supply module, a DC bus module and an AC / DC power supply input switching circuit as described in any one of claims 1 to 10; The output end of the AC / DC power input switching circuit is connected to the input end of the auxiliary power module to provide energy for the auxiliary power module.
12. The energy storage converter according to claim 11, characterized in that: When the DC power input circuit includes multiple groups of DC power input units, the input ends of one group of the DC power input units are connected to the DC bus module of the energy storage inverter, and the input ends of another group of the DC power input units are connected to a DC energy storage device outside the energy storage inverter.