Converter circuit, energy storage converter device and battery equipment

Abstract

The utility model discloses a current converter circuit, an energy storage current converter device and battery equipment, and belongs to the technical field of electronics and electrics. In the circuit, an alternating current end of a first converter bridge module is connected with a first end of a first switch module, and a second end and a third end of the first switch module are respectively connected with a first alternating current end and a positive pole direct current end of the circuit; the alternating-current end of the second converter bridge module is connected with the first end of the second switch module; the second end and the third end of the second switch module are respectively connected with the second alternating-current end and the negative direct-current end of the circuit; the first switch module and the second switch module are configured to conduct the connection between the first end and the second end and disconnect the connection between the first end and the third end in the first switch state, and conduct the connection between the first end and the third end and disconnect the connection between the first end and the second end in the second switch state. According to the invention, a DC-DC conversion circuit used for electric energy output in the battery equipment equipped with the energy storage converter device can be omitted.

Description

Technical Field

[0001] The present application relates to electronic and electrical technologies, and particularly to a converter circuit, an energy storage converter device, and a battery device. Background Art

[0002] An energy storage converter (Power Conversion System, PCS, also known as an energy storage inverter) device is an electronic device capable of performing AC-DC (alternating current - direct current) conversion and DC-AC (direct current - alternating current) conversion between a battery device and a power grid - when the battery device is fully charged, the energy storage converter device can output the excess electrical energy to the power grid through DC-AC conversion; when the battery device has insufficient power, the energy storage converter device can draw electrical energy from the power grid through AC-DC conversion to charge the battery device.

[0003] Currently, when a battery device equipped with an energy storage converter device supplies energy to an external load, an additional DC-DC (direct current - direct current) conversion circuit is generally used alone to convert the battery voltage into the voltage required by the load to achieve electrical energy output. The DC-DC conversion circuit will bring additional design, manufacturing, assembly, and testing processes to the production and manufacturing of the battery device, and it is necessary to occupy the internal space of the battery device, which is not conducive to the miniaturization and portability of the battery device. Summary of the Invention

[0004] The present application provides a converter circuit, an energy storage converter device, and a battery device, which can eliminate the DC-DC conversion circuit for electrical energy output in a battery device equipped with an energy storage converter device.

[0005] An embodiment of the present application provides a converter circuit. The converter circuit has a first DC terminal, a second DC terminal, a first AC terminal, a second AC terminal, a third AC terminal, a positive DC terminal, and a negative DC terminal. The converter circuit includes a first commutation bridge module, a second commutation bridge module, a third commutation bridge module, a first switch module, and a second switch module; wherein,

[0006] Two DC terminals of the first commutation bridge module are respectively connected to the first DC terminal and the second DC terminal, an AC terminal of the first commutation bridge module is connected to a first end of the first switch module, and a second end and a third end of the first switch module are respectively connected to the first AC terminal and the positive DC terminal;

[0007] Two DC terminals of the second commutation bridge module are respectively connected to the first DC terminal and the second DC terminal, an AC terminal of the second commutation bridge module is connected to a first end of the second switch module, and a second end and a third end of the second switch module are respectively connected to the second AC terminal and the negative DC terminal;

[0008] The two DC terminals of the third commutation bridge module are respectively connected to the first DC terminal and the second DC terminal, and the AC terminal of the third commutation bridge module is connected to the third AC terminal;

[0009] Both the first switch module and the second switch module are configured to: conduct the connection between the first end and the second end and disconnect the connection between the first end and the third end in the first switch state, and conduct the connection between the first end and the third end and disconnect the connection between the first end and the second end in the second switch state.

[0010] In some possible implementation manners, each of the first commutation bridge module, the second commutation bridge module, and the third commutation bridge module includes a commutation bridge unit and a filter unit. The two DC terminals of the commutation bridge unit are respectively connected to the two DC terminals of the first commutation bridge module, the second commutation bridge module, or the third commutation bridge module. The AC terminal of the commutation bridge unit is connected to the first end of the filter unit, and the second end of the filter unit is connected to the AC terminal of the first commutation bridge module, the second commutation bridge module, or the third commutation bridge module; The converter circuit further includes at least one of a third switch module and a fourth switch module. The two ends of the third switch module are respectively connected to the first end and the second end of the filter unit of the first commutation bridge module, and the two ends of the fourth switch module are respectively connected to the first end and the second end of the filter unit of the second commutation bridge module. Both the third switch module and the fourth switch module are configured to: conduct the connection between the two ends in the first switch state and disconnect the connection between the two ends in the second switch state.

[0011] In some possible implementation manners, the filter unit includes a first inductor, a second inductor, a first capacitor, and a first switching element. The first end of the first inductor is connected to the first end of the filter unit. The second end of the first inductor is respectively connected to the first end of the first capacitor and the first end of the second inductor. The second end of the second inductor is connected to the second end of the filter unit. The second end of the first capacitor is connected to the first end of the first switching element. The second end of the first switching element is connected to the DC common terminal of the converter circuit. The first switching element is configured to conduct or disconnect the connection between the first end and the second end according to different switch states.

[0012] In some possible implementations, the commutation bridge unit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a first diode, and a second diode. A first pole of the first transistor is connected to a DC terminal of the commutation bridge unit. A second pole of the first transistor is respectively connected to a first pole of the second transistor and a cathode of the first diode. A second pole of the second transistor is respectively connected to a first pole of the third transistor and an AC terminal of the commutation bridge unit. A second pole of the third transistor is respectively connected to a first pole of the fourth transistor and an anode of the second diode. A second pole of the fourth transistor is connected to another DC terminal of the commutation bridge unit. An anode of the first diode is respectively connected to a cathode of the second diode and a DC common terminal of the converter circuit. The first pole and the second pole are respectively one of a source electrode and a drain electrode.

[0013] In some possible implementations, the converter circuit further has a spare DC terminal. The converter circuit further includes a fifth switch module connected between an AC terminal of the third commutation bridge module and the third AC terminal. A first end of the fifth switch module is connected to the AC terminal of the third commutation bridge module. A second end and a third end of the fifth switch module are respectively connected to the third AC terminal and the spare DC terminal. The fifth switch module is configured to: conduct the connection between the first end and the second end and disconnect the connection between the first end and the third end in a first switch state, and conduct the connection between the first end and the third end and disconnect the connection between the first end and the second end in a second switch state.

[0014] In some possible implementations, each of the first commutation bridge module, the second commutation bridge module, and the third commutation bridge module includes a commutation bridge unit and a filter unit. Two DC terminals of the commutation bridge unit are respectively connected to two DC terminals of the first commutation bridge module, the second commutation bridge module, or the third commutation bridge module. An AC terminal of the commutation bridge unit is connected to a first end of the filter unit. A second end of the filter unit is connected to an AC terminal of the first commutation bridge module, the second commutation bridge module, or the third commutation bridge module. The converter circuit further includes a sixth switch module. Two ends of the sixth switch module are respectively connected to the first end and the second end of the filter unit of the third commutation bridge module. The sixth switch module is configured to: conduct the connection between the two ends in a first switch state and disconnect the connection between the two ends in a second switch state.

[0015] In some possible implementations, the first switch module and the second switch module each include a second switch element and a third switch element, the first end of the second switch element and the first end of the third switch element are both connected to the first end of the first switch module or the second switch module, the second end of the second switch element is connected to the second end of the first switch module or the second switch module, the second end of the third switch element is connected to the third end of the first switch module or the second switch module, and the second switch element and the third switch element are both configured to turn on or off the connection between the first end and the second end according to different switching states.

[0016] In some possible implementations, the switching elements in the converter circuit are all electromagnetic relays.

[0017] An embodiment of the present application further provides an energy storage converter device, which includes at least one converter circuit of any one of the above.

[0018] An embodiment of the present application further provides a battery device, which includes any one of the above-mentioned energy storage inverter devices.

[0019] In the converter circuit of the embodiment of the present application, a first switch module and a second switch module are respectively arranged at two of the three AC ends, so that the converter circuit can operate in different conversion modes as the two switching states are switched - when the first switch module and the second switch module are both in the first switch state, each converter bridge module is respectively connected to the corresponding AC end of the converter circuit, and the converter circuit can work normally in the AC-DC conversion or DC-AC conversion working mode; when the first switch module and the second switch module are both in the second switch state, the first converter bridge module and the second converter bridge module are respectively connected to the positive DC end and the negative DC end of the converter circuit, so that the converter circuit can operate in the DC-DC conversion working mode with the help of the circuit function of the converter bridge module itself. It can be seen that the embodiment of the present application can utilize two switch modules to enable a battery device equipped with an energy storage inverter device to achieve a DC-DC conversion function without the aid of an additionally configured DC-DC conversion circuit. That is, the ability of the converter bridge module itself to achieve DC-DC conversion can be utilized to eliminate the need for an additionally configured DC-DC conversion circuit, which can help expand the achievable functions of the inverter circuit and the energy storage inverter device, and can help simplify the production and manufacturing process of the battery device and save internal space, and can contribute to the miniaturization and portability of related products.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a structural block diagram of a converter circuit in an embodiment of the present application;

[0023] Figure 2 is a schematic circuit diagram of a first commutation bridge module and its connection circuit part in a converter circuit in an embodiment of the present application;

[0024] Figure 3 is a schematic circuit diagram of a second commutation bridge module and its connection circuit part in a converter circuit in an embodiment of the present application;

[0025] Figure 4 is a schematic circuit diagram of a third commutation bridge module and its connection circuit part in a converter circuit in an embodiment of the present application;

[0026] Figure 5 is a structural block diagram of an energy storage converter device in an embodiment of the present application;

[0027] Figure 6 is a structural block diagram of a battery device in an embodiment of the present application. Specific Embodiments

[0028] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings.

[0029] In the present application, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0030] Figure 1 is a structural block diagram of a converter circuit in an embodiment of the present application. See Figure 1, the converter circuit has a first DC terminal BUS1, a second DC terminal BUS0, a first AC terminal GU, a second AC terminal GV, a third AC terminal GW, a positive DC terminal DC1 and a negative DC terminal DC0, and includes a first converter bridge module 11, a second converter bridge module 12, a third converter bridge module 13, a first switch module 14 and a second switch module 15. As Figure 1 shown, the two DC terminals of the first converter bridge module 11 are respectively connected to the first DC terminal BUS1 and the second DC terminal BUS0, the AC terminal of the first converter bridge module 11 is connected to the first end of the first switch module 14, and the second end and the third end of the first switch module 14 are respectively connected to the first AC terminal GU and the positive DC terminal DC1. The two DC terminals of the second converter bridge module 12 are respectively connected to the first DC terminal BUS1 and the second DC terminal BUS0, the AC terminal of the second converter bridge module 12 is connected to the first end of the second switch module 15, and the second end and the third end of the second switch module 15 are respectively connected to the second AC terminal GV and the negative DC terminal DC0. The two DC terminals of the third converter bridge module 13 are respectively connected to the first DC terminal BUS1 and the second DC terminal BUS0, and the AC terminal of the third converter bridge module 13 is connected to the third AC terminal GW.

[0031] Among them, both the first switch module 14 and the second switch module 15 are configured to: conduct the connection between the first end and the second end and disconnect the connection between the first end and the third end in the first switch state, and conduct the connection between the first end and the third end and disconnect the connection between the first end and the second end in the second switch state.

[0032] In the converter circuit of the embodiment of the present application, a first switch module 14 and a second switch module 15 are respectively provided at two of the three AC ends, so that the converter circuit can operate in different conversion modes as the two switch states are switched - when the first switch module 14 and the second switch module 15 are both in the first switch state, each converter bridge module is respectively connected to the corresponding AC end of the converter circuit, and at this time the converter circuit can work normally in the AC-DC conversion or DC-AC conversion working mode; when the first switch module 14 and the second switch module 15 are both in the second switch state, the first converter bridge module 11 and the second converter bridge module 12 are respectively connected to the positive DC end DC1 and the negative DC end DC0 of the converter circuit, so that the converter circuit can operate in the DC-DC conversion working mode with the help of the circuit function of the converter bridge module itself. It can be seen that the embodiment of the present application can utilize two switch modules to enable a battery device equipped with an energy storage inverter device to achieve a DC-DC conversion function without the aid of an additionally configured DC-DC conversion circuit. That is, the ability of the converter bridge module itself to achieve DC-DC conversion can be utilized to eliminate the need for an additionally configured DC-DC conversion circuit, which can help expand the achievable functions of the inverter circuit and the energy storage inverter device, and can help simplify the production and manufacturing process of the battery device and save internal space, and can contribute to the miniaturization and portability of related products.

[0033] It should be noted that, in one example, the first DC terminal BUS1 and the second DC terminal BUS0 constitute the first DC port of the converter circuit, and are used to connect the positive and negative poles of the battery respectively; the first AC terminal GU, the second AC terminal GV, and the third AC terminal GW constitute the AC port of the converter circuit, and are used to connect the three live wires of the power grid respectively; the positive DC terminal DC1 and the negative DC terminal DC0 constitute the second DC port of the converter circuit, which is used to connect an external device that needs to charge the battery or an external device that needs to obtain electrical energy from the battery.

[0034] It should be understood that the correspondence between the first AC terminal GU, the second AC terminal GV, the third AC terminal GW and the three live wires is not limited to being connected to the three live wires U, V, and W respectively; in other examples, they can also be connected to the three live wires U, W, and V respectively, or W, U, V, or W, V, U, or V, W, U, or V, U, W. That is, the present application is not limited to using the U-phase and V-phase converter bridge modules to respectively connect the positive and negative electrodes of the second DC port, but can use a combination of any two of the three phases.

[0035] It should be noted that the commutation bridge module refers to a circuit structure with a commutation bridge or its equivalent circuit, and is a circuit module capable of realizing AC-DC conversion and DC-AC conversion between two DC terminals and one AC terminal of a converter circuit; the switch module refers to a circuit module capable of switching the switch state to change the circuit connection state. In the embodiments of the present application, each circuit module can be implemented with reference to the circuit structures with similar or equivalent functions in the related art according to the description herein, and the embodiments of the present application do not limit this.

[0036] As a specific example, Figure 2 、 Figure 3 and Figure 4 show the circuit structures of different parts of a converter circuit in the embodiments of the present application.

[0037] Figure 2 is a schematic diagram of the circuit structure of the first commutation bridge module and its connection circuit part in a converter circuit in the embodiments of the present application. Refer to Figure 2 , the above-mentioned first commutation bridge module 11 includes a commutation bridge unit 11A and a filter unit 11B. The two DC terminals of the commutation bridge unit 11A are respectively connected to the first DC terminal BUS1 and the second DC terminal BUS0 via the two DC terminals of the first commutation bridge module 11. The AC terminal of the commutation bridge unit 11A ( Figure 2 the right end in Figure 2 ) is connected to the first end of the filter unit 11B ( Figure 2 the left end in Figure 2 ). The second end of the filter unit 11B ( Figure 2 the right end in Figure 2 ) is connected to the first end of the first switch module 14 via the AC terminal of the first commutation bridge module 11 ( Figure 2 the left end in

[0038] Refer to Figure 2In one example, the commutation bridge unit 11A includes a first transistor U-T1, a second transistor U-T2, a third transistor U-T3, a fourth transistor U-T4, a first diode U-D1 and a second diode U-D2. The first electrode of the first transistor U-T1 is connected to the first DC terminal BUS1 via a DC terminal of the commutation bridge unit 11A. The second electrode of the first transistor U-T1 is respectively connected to the first electrode of the second transistor U-T2 and the negative electrode of the first diode U-D1. The second electrode of the second transistor U-T2 is respectively connected to the first electrode of the third transistor U-T3 and the AC terminal of the commutation bridge unit 11A (that is, connected to the first terminal of the filter unit 11B). The second electrode of transistor U-T3 is respectively connected to the first electrode of the fourth transistor U-T4 and the positive electrode of the second diode U-D2, the second electrode of the fourth transistor U-T4 is connected to the second DC terminal BUS0 via the other DC terminal of the converter bridge unit 11A, the positive electrode of the first diode U-D1 is respectively connected to the negative electrode of the second diode U-D2 and the DC common terminal BUSN of the converter circuit (the converter circuit also includes a second capacitor C1 and a third capacitor C2, the DC common terminal BUSN is respectively connected to the negative electrode of the second capacitor C1 and the positive electrode of the third capacitor C2, the positive electrode of the second capacitor C1 is connected to the first DC terminal BUS1, and the negative electrode of the third capacitor C2 is connected to the second DC terminal BUS0). It should be noted that the above-mentioned first electrode and second electrode are respectively one of the source and the drain, Figure 2 , Figure 3 and Figure 4 In the example, the first electrode is the drain and the second electrode is the source.

[0039] Continue to see Figure 2 The filter unit 11B includes a first inductor U-L1, a second inductor U-L2, a first capacitor UC and a first switching element U-K1. The first end of the first inductor U-L1 is connected to the first end of the filter unit 11B (and thus connected to the AC end of the converter bridge unit 11A). The second end of the first inductor U-L1 is respectively connected to the first end of the first capacitor UC and the first end of the second inductor U-L2. The second end of the second inductor U-L2 is connected to the second end of the filter unit 11B (and thus connected to the first end of the first switch module 14). The second end of the first capacitor UC is connected to the first end of the first switching element U-K1. The second end of the first switching element U-K1 is connected to the DC common terminal BUSN of the converter circuit. The first switching element U-K1 is configured to turn on or off the connection between the first end and the second end according to different switching states.

[0040] Continue to see Figure 2, the first switching module 14 includes a second switching element U-K2 and a third switching element U-K3. The first ends of the second switching element U-K2 and the third switching element U-K3 are both connected to the first end of the first switching module 14 (thus connecting to the second end of the filter unit 11B). The second end of the second switching element U-K2 is connected to the second end of the first switching module 14 (thus connecting to the first AC terminal GU), and the second end of the third switching element U-K3 is connected to the third end of the first switching module 14 (thus connecting to the positive DC terminal DC1). Both the second switching element U-K2 and the third switching element U-K3 are configured to conduct or disconnect the connection between the first end and the second end according to different switching states.

[0041] Continue to refer to Figure 2 , the converter circuit further includes a third switching module 16. The two ends of the third switching module 16 are respectively connected to the first end and the second end of the filter unit 11B of the first converter bridge module 11. The third switching module 16 is configured to: conduct the connection between the two ends in the first switching state and disconnect the connection between the two ends in the second switching state. As an example, the third switching module 16 includes a fourth switching element U-K4.

[0042] Figure 3 is a schematic circuit diagram of the second converter bridge module and its connection circuit part in a converter circuit in an embodiment of the present application. Refer to Figure 3 , the above-mentioned second converter bridge module 12 includes a converter bridge unit 12A and a filter unit 12B. The two DC terminals of the converter bridge unit 12A are respectively connected to the first DC terminal BUS1 and the second DC terminal BUS0 via the two DC terminals of the second converter bridge module 12. The AC terminal of the converter bridge unit 12A ( Figure 3 the right end in) is connected to the first end of the filter unit 12B ( Figure 3 the left end in), and the second end of the filter unit 12B ( Figure 3 the right end in) is connected to the first end of the second switching module 15 ( Figure 3 the left end in) via the AC terminal of the second converter bridge module 12.

[0043] Refer to Figure 3, in one example, the commutation bridge unit 12A includes a first transistor V-T1, a second transistor V-T2, a third transistor V-T3, a fourth transistor V-T4, a first diode V-D1, and a second diode V-D2. A first pole of the first transistor V-T1 is connected to the first DC terminal BUS1 via a DC terminal of the commutation bridge unit 12A. A second pole of the first transistor V-T1 is respectively connected to a first pole of the second transistor V-T2 and a cathode of the first diode V-D1. A second pole of the second transistor V-T2 is respectively connected to a first pole of the third transistor V-T3 and an AC terminal of the commutation bridge unit 12A (i.e., connected to a first end of the filter unit 12B). A second pole of the third transistor V-T3 is respectively connected to a first pole of the fourth transistor V-T4 and an anode of the second diode V-D2. A second pole of the fourth transistor V-T4 is connected to the second DC terminal BUS0 via another DC terminal of the commutation bridge unit 12A. An anode of the first diode V-D1 is respectively connected to a cathode of the second diode V-D2 and a DC common terminal BUSN of the converter circuit.

[0044] Continue to refer to Figure 3 , the filter unit 12B includes a first inductor V-L1, a second inductor V-L2, a first capacitor V-C, and a first switching element V-K1. A first end of the first inductor V-L1 is connected to a first end of the filter unit 12B (thus connected to the AC terminal of the commutation bridge unit 12A). A second end of the first inductor V-L1 is respectively connected to a first end of the first capacitor V-C and a first end of the second inductor V-L2. A second end of the second inductor V-L2 is connected to a second end of the filter unit 12B (thus connected to a first end of the second switching module 15). A second end of the first capacitor V-C is connected to a first end of the first switching element V-K1. A second end of the first switching element V-K1 is connected to the DC common terminal BUSN of the converter circuit. The first switching element V-K1 is configured to conduct or disconnect the connection between the first end and the second end according to different switching states.

[0045] Continue to refer to Figure 3 , the second switching module 15 includes a second switching element V-K2 and a third switching element V-K3. A first end of the second switching element V-K2 and a first end of the third switching element V-K3 are both connected to a first end of the second switching module 15 (thus connected to a second end of the filter unit 12B). A second end of the second switching element V-K2 is connected to a second end of the second switching module 15 (thus connected to the second AC terminal GV). A second end of the third switching element V-K3 is connected to a third end of the second switching module 15 (thus connected to the negative DC terminal DC0). Both the second switching element V-K2 and the third switching element V-K3 are configured to conduct or disconnect the connection between the first end and the second end according to different switching states.

[0046] Continue to refer to Figure 3, the converter circuit further includes a fourth switching module 17. The two ends of the fourth switching module 17 are respectively connected to the first end and the second end of the filter unit 12B of the second commutation bridge module 12. The fourth switching module 17 is configured to: conduct the connection between the two ends in the first switching state and disconnect the connection between the two ends in the second switching state. As an example, the fourth switching module 17 includes a fourth switching element V-K4.

[0047] Figure 4 It is a schematic circuit diagram of the third commutation bridge module and its connection circuit part in a converter circuit in an embodiment of the present application. Refer to Figure 4 , the above-mentioned third commutation bridge module 13 includes a commutation bridge unit 13A and a filter unit 13B. The two DC terminals of the commutation bridge unit 13A are respectively connected to the first DC terminal BUS1 and the second DC terminal BUS0 via the two DC terminals of the third commutation bridge module 13. The AC terminal of the commutation bridge unit 13A ( Figure 4 the right end in) is connected to the first end of the filter unit 13B ( Figure 4 the left end in), and the second end of the filter unit 13B ( Figure 4 the right end in) is connected to the first end of the second switching module 15 ( Figure 4 the left end in) via the AC terminal of the third commutation bridge module 13.

[0048] Refer to Figure 4 , in one example, the commutation bridge unit 13A includes a first transistor W-T1, a second transistor W-T2, a third transistor W-T3, a fourth transistor W-T4, a first diode W-D1 and a second diode W-D2. The first pole of the first transistor W-T1 is connected to the first DC terminal BUS1 via a DC terminal of the commutation bridge unit 13A. The second pole of the first transistor W-T1 is respectively connected to the first pole of the second transistor W-T2 and the negative pole of the first diode W-D1. The second pole of the second transistor W-T2 is respectively connected to the first pole of the third transistor W-T3 and the AC terminal of the commutation bridge unit 13A (i.e., connected to the first end of the filter unit 13B). The second pole of the third transistor W-T3 is respectively connected to the first pole of the fourth transistor W-T4 and the positive pole of the second diode W-D2. The second pole of the fourth transistor W-T4 is connected to the second DC terminal BUS0 via the other DC terminal of the commutation bridge unit 13A. The positive pole of the first diode W-D1 is respectively connected to the negative pole of the second diode W-D2 and the DC common terminal BUSN of the converter circuit.

[0049] Continue to refer to Figure 4, the filter unit 13B includes a first inductor W-L1, a second inductor W-L2, a first capacitor W-C, and a first switching element W-K1. The first end of the first inductor W-L1 is connected to the first end of the filter unit 13B (thus connected to the AC end of the commutation bridge unit 13A). The second end of the first inductor W-L1 is respectively connected to the first end of the first capacitor W-C and the first end of the second inductor W-L2. The second end of the second inductor W-L2 is connected to the second end of the filter unit 13B (thus connected to the first end of the second switching module 15). The second end of the first capacitor W-C is connected to the first end of the first switching element W-K1. The second end of the first switching element W-K1 is connected to the DC common terminal BUSN of the converter circuit. The first switching element W-K1 is configured to conduct or disconnect the connection between the first end and the second end according to different switching states.

[0050] Continue to refer to Figure 4 , the converter circuit also has a spare DC terminal DC2. The converter circuit further includes a fifth switching module 18 connected between the AC end of the third commutation bridge module 13 and the third AC terminal GW. The first end of the fifth switching module 18 is connected to the AC end of the third commutation bridge module 13. The second end and the third end of the fifth switching module 18 are respectively connected to the third AC terminal GW and the spare DC terminal DC2. The fifth switching module 18 is configured to: conduct the connection between the first end and the second end and disconnect the connection between the first end and the third end in the first switching state, and conduct the connection between the first end and the third end and disconnect the connection between the first end and the second end in the second switching state. As Figure 4 shown, the fifth switching module 18 includes a second switching element W-K2 and a third switching element W-K3. The first end of the second switching element W-K2 and the first end of the third switching element W-K3 are both connected to the first end of the fifth switching module 18 (thus connected to the second end of the filter unit 13B). The second end of the second switching element W-K2 is connected to the second end of the fifth switching module 18 (thus connected to the third AC terminal GW). The second end of the third switching element W-K3 is connected to the third end of the fifth switching module 18 (thus connected to the spare DC terminal DC2). The second switching element W-K2 and the third switching element W-K3 are both configured to conduct or disconnect the connection between the first end and the second end according to different switching states.

[0051] Continue to refer to Figure 4 , the converter circuit further includes a sixth switching module 19. The two ends of the sixth switching module 19 are respectively connected to the first end and the second end of the filter unit 13B of the third commutation bridge module 13. The sixth switching module 19 is configured to: conduct the connection between the two ends in the first switching state and disconnect the connection between the two ends in the second switching state. As an example, the sixth switching module 19 includes a fourth switching element W-K4.

[0052] Based on the above circuit structure,Figure 2 , Figure 3 and Figure 4 The converter circuits shown in Figure 2 , Figure 3 and Figure 4 can operate in different electrical signal conversion modes under different combinations of switch states. As an example, each switching element is respectively connected to a switch signal output terminal of the control circuit of the converter circuit (so that it can switch the switch state under the control of the control circuit), and the gate of each transistor is respectively connected to a pulse width modulation (PWM) signal output terminal of the control circuit of the converter circuit (so that it can switch between the cut-off region and the linear region / saturation region under the control of the control circuit).

[0053] See Figure 1 , Figure 2 , Figure 3 and Figure 4 In one example, when the control circuit needs to control the converter circuit to operate in a three-phase AC-DC conversion or AC-DC conversion mode (three-phase bidirectional AC-DC conversion), it can control the second switching elements U-K2, V-K2, W-K2 to be all in the on state and the third switching elements U-K3, V-K3, W-K3 to be all in the off state, so that the converter circuit is connected between the first DC port and the AC port. At this time, the control circuit can make each converter bridge operate in an inverter (DC-AC) or rectifier (AC-DC) state by providing PWM signals to each transistor, so as to realize the mutual conversion between the DC signal and the three-phase AC signal. In one example, the control circuit can control the first switching elements U-K1, V-K1, W-K1 to be all in the on state and the fourth switching elements U-K4, V-K4, W-K4 to be all in the off state, so that each filter unit can filter the three-phase AC signal based on the LCL filter circuit respectively.

[0054] See Figure 1 , Figure 2 , Figure 3 and Figure 4, in one example, when the control circuit needs to control the converter circuit to operate in the DC-DC conversion mode, it can control the second switching elements U-K2 and V-K2 to be in the off state and the third switching elements U-K3 and V-K3 to be in the on state. As a result, the converter circuit is connected between the first DC port and the second DC port (the positive DC terminal DC1 and the negative DC terminal DC0). At this time, the control circuit can make each converter bridge operate in the boost / BUCK / BUCK-BOOST state by providing PWM signals to each transistor, so as to realize the mutual conversion between DC signals. In one example, the control circuit can control the first switching elements U-K1, V-K1, and W-K1 to be in the off state and the fourth switching elements U-K4, V-K4, and W-K4 to be in the on state, so that each filter unit is short-circuited and will not affect the DC-DC conversion.

[0055] In addition, in one example, when the control circuit detects that an electrical device is connected between any two of the positive DC terminal DC1, the negative DC terminal DC0, and the standby DC terminal DC2, the control circuit can determine which of the positive DC terminal DC1, the negative DC terminal DC0, and the standby DC terminal DC2 is connected to the positive electrode of the electrical device and which is connected to the negative electrode of the electrical device through positive and negative detection, and correspondingly control the corresponding second switching elements to be in the off state and the third switching elements to be in the on state, so that the converter circuit operates in the corresponding DC-DC conversion mode in a process similar to that described above.

[0056] It should be understood that the above first switching elements U-K1, V-K1, W-K1 and fourth switching elements U-K4, V-K4, W-K4 are all optional components. In practical applications, any number of switching elements can be selected for application, or none of them can be selected, and the above-mentioned working mode switching process can be realized.

[0057] It should be noted that any one of the above switching elements can be implemented by components such as transistors, relays, controllable diodes, optocouplers, or any other element or circuit structure with equivalent functions. The embodiments of the present application do not limit this. In one example, all of the above switching elements are electromagnetic relays with control terminals connected to the above control circuit, so that the control circuit can switch the position of the relay core through a control signal, thereby realizing the functions of the above switching elements.

[0058] Figure 5 is a structural block diagram of an energy storage converter device in an embodiment of the present application. Refer to Figure 5, the energy storage converter device 50 includes at least one converter circuit 52 of any of the above, and further includes a control circuit 51 corresponding to and connected to each converter circuit 52. In one example, the control circuit 51 includes: a processor; a memory for storing executable instructions of the processor; wherein, the processor is configured to execute the executable instructions to implement the operations performed by the above control circuit. The processor may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components. It should be understood that examples of the implementation manners of the interconnected converter circuit 52 and control circuit 51 have been described above, and will not be elaborated herein one by one.

[0059] Figure 6 is a structural block diagram of a battery device in an embodiment of the present application. Refer to Figure 6 , the battery device 60 includes the energy storage converter device 61 of any of the above, and a battery 62 connected to the energy storage converter device 61. The battery 62 refers to any component or structure capable of storing electrical energy, and the battery device 60 may be any type of energy storage device.

[0060] As described above, the embodiment of the present application can enable a battery device equipped with an energy storage converter device to achieve the DC-DC conversion function without relying on an additional configured DC-DC conversion circuit by using two switch modules, that is, it can save the additional configured DC-DC conversion circuit by utilizing the ability of the converter bridge module itself to achieve DC-DC conversion, which can help expand the achievable functions of the converter circuit and the energy storage converter device, simplify the production and manufacturing process of the battery device and save internal space, and contribute to the miniaturization and portability of related products.

[0061] It should be noted that the above are only optional embodiments of the present application, and each of the above implementation manners can be appropriately modified according to actual application requirements. For example, in any of the above circuit structures, any resistor can be implemented by multiple resistors having a series structure and / or a parallel structure, and any capacitor can be implemented by multiple capacitors having a series structure and / or a parallel structure.

[0062] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A converter circuit, characterized in that: The converter circuit has a first DC terminal, a second DC terminal, a first AC terminal, a second AC terminal, a third AC terminal, a positive DC terminal and a negative DC terminal, and the converter circuit includes a first converter bridge module, a second converter bridge module, a third converter bridge module, a first switch module and a second switch module; wherein, The two DC ends of the first converter bridge module are respectively connected to the first DC end and the second DC end, the AC end of the first converter bridge module is connected to the first end of the first switch module, and the second end and the third end of the first switch module are respectively connected to the first AC end and the positive DC end; The two DC ends of the second converter bridge module are respectively connected to the first DC end and the second DC end, the AC end of the second converter bridge module is connected to the first end of the second switch module, and the second end and the third end of the second switch module are respectively connected to the second AC end and the negative DC end; The two DC ends of the third converter bridge module are respectively connected to the first DC end and the second DC end, and the AC end of the third converter bridge module is connected to the third AC end; The first switch module and the second switch module are both configured to: conduct the connection between the first end and the second end and disconnect the connection between the first end and the third end in a first switch state, and conduct the connection between the first end and the third end and disconnect the connection between the first end and the second end in a second switch state.

2. The inverter circuit according to claim 1, characterized in that: Each of the first converter bridge module, the second converter bridge module and the third converter bridge module comprises a converter bridge unit and a filter unit, wherein two DC ends of the converter bridge unit are respectively connected to two DC ends of the first converter bridge module, the second converter bridge module or the third converter bridge module, an AC end of the converter bridge unit is connected to a first end of the filter unit, and a second end of the filter unit is connected to an AC end of the first converter bridge module, the second converter bridge module or the third converter bridge module; The converter circuit also includes at least one of a third switch module and a fourth switch module, wherein two ends of the third switch module are respectively connected to a first end and a second end of a filter unit of the first converter bridge module, and two ends of the fourth switch module are respectively connected to a first end and a second end of a filter unit of the second converter bridge module, and the third switch module and the fourth switch module are both configured to: conduct the connection between the two ends in a first switch state, and disconnect the connection between the two ends in a second switch state.

3. The inverter circuit according to claim 2, characterized in that: The filter unit includes a first inductor, a second inductor, a first capacitor and a first switching element, wherein the first end of the first inductor is connected to the first end of the filter unit, the second end of the first inductor is respectively connected to the first end of the first capacitor and the first end of the second inductor, the second end of the second inductor is connected to the second end of the filter unit, the second end of the first capacitor is connected to the first end of the first switching element, the second end of the first switching element is connected to the DC common end of the converter circuit, and the first switching element is configured to turn on or off the connection between the first end and the second end according to different switching states.

4. The inverter circuit according to claim 2, characterized in that: The commutation bridge unit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a first diode and a second diode. The first electrode of the first transistor is connected to a DC end of the commutation bridge unit, the second electrode of the first transistor is respectively connected to the first electrode of the second transistor and the negative electrode of the first diode, the second electrode of the second transistor is respectively connected to the first electrode of the third transistor and the AC end of the commutation bridge unit, the second electrode of the third transistor is respectively connected to the first electrode of the fourth transistor and the positive electrode of the second diode, the second electrode of the fourth transistor is connected to another DC end of the commutation bridge unit, the positive electrode of the first diode is respectively connected to the negative electrode of the second diode and the DC common end of the converter circuit, and the first electrode and the second electrode are respectively one of the source and the drain.

5. The inverter circuit according to any one of claims 1 to 4, characterized in that: The converter circuit also has a spare DC terminal, and the converter circuit also includes a fifth switch module connected between the AC terminal of the third converter bridge module and the third AC terminal; The first end of the fifth switch module is connected to the AC end of the third converter bridge module, the second end and the third end of the fifth switch module are respectively connected to the third AC end and the standby DC end, and the fifth switch module is configured to: in a first switch state, connect the first end to the second end and disconnect the first end to the third end, and connect the first end to the third end and disconnect the first end to the second end in a second switch state.

6. The inverter circuit according to claim 5, characterized in that: Each of the first bridge converter module, the second bridge converter module and the third bridge converter module includes a bridge converter unit and a filter unit, the two DC ends of the bridge converter unit are respectively connected to the two DC ends of the first bridge converter module, the second bridge converter module or the third bridge converter module, the AC end of the bridge converter unit is connected to the first end of the filter unit, and the second end of the filter unit is connected to the AC end of the first bridge converter module, the second bridge converter module or the third bridge converter module; the converter circuit also includes a sixth switch module, the two ends of the sixth switch module are respectively connected to the first end and the second end of the filter unit of the third bridge converter module, and the sixth switch module is configured to: conduct the connection between the two ends in the first switch state, and disconnect the connection between the two ends in the second switch state.

7. The inverter circuit according to any one of claims 1 to 4, characterized in that: The first switch module and the second switch module each include a second switch element and a third switch element, wherein a first end of the second switch element and a first end of the third switch element are both connected to a first end of the first switch module or the second switch module, a second end of the second switch element is connected to a second end of the first switch module or the second switch module, and a second end of the third switch element is connected to a third end of the first switch module or the second switch module, and the second switch element and the third switch element are both configured to turn on or off the connection between the first end and the second end according to different switch states.

8. The inverter circuit according to claim 1, characterized in that: The switch elements in the converter circuit are all electromagnetic relays.

9. An energy storage converter device, characterized in that: The energy storage inverter device comprises at least one inverter circuit according to any one of claims 1 to 7.

10. A battery device, characterized in that: The battery device comprises the energy storage inverter device as claimed in claim 9.

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