Pentagonal-connection five-phase power converter and charging equipment

Abstract

The utility model discloses a pentagonal-connection five-phase power converter and a charging device, a multi-level output end of a power supply circuit is connected with input ends in a five-phase chopper circuit of which the input ends are cascaded / connected in parallel, so that a technology of connecting a plurality of power tubes in parallel is not used, and the problem of non-uniform current failure caused by parallel connection can be reduced; each five-phase chopper circuit is connected with five resonance circuits; the primary sides of the five resonance circuits are in pentagonal connection, and the secondary sides of the five resonance circuits are in pentagonal / star-shaped connection; each five-phase transformer circuit is respectively connected with a five-phase rectification circuit, each five-phase rectification circuit is connected with a filter circuit, the five-phase power converter in pentagonal connection can greatly reduce the generation of ripple voltage and ripple current, topology level series-parallel expansion is carried out, and a larger power converter is easy to realize.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a pentagonally connected five-phase power converter and a charging device. Background Art

[0002] In the application of new energy charging piles, the core component of high-power DC charging piles is the power converter. The common DC-to-DC topologies in power converters mainly include half-bridge, full-bridge, and three-phase structures. Half-bridge, full-bridge, and three-phase structures are further divided into two-level, three-level, primary side series / parallel, and secondary side series / parallel according to different design ideas.

[0003] With the market's increasing demand for power converter output power and the requirements for output voltage ripple and current ripple quality, the general solution is to add an output filter to solve this problem. This solution cannot meet the market's requirements for high power density and low cost. However, in the design of power converters, reducing ripple, reducing costs, and improving reliability is a direction that needs to be continuously optimized. Utility Model Content

[0004] The main purpose of the present application is to provide a pentagonally connected five-phase power converter and charging equipment, aiming to solve the technical problems in the prior art that power converters need to be further optimized in terms of reducing ripple, reducing costs and improving reliability.

[0005] To achieve the above-mentioned purpose, the present application provides a pentagonally connected five-phase power converter, comprising: a power supply circuit, a five-phase chopper circuit, a resonant circuit, a five-phase transformer circuit, a five-phase rectifier circuit and a filter circuit; the five-phase chopper circuit has a first common input terminal, a second common input terminal and a plurality of output terminals, and the first common input terminal and the second common input terminal of the five-phase chopper circuit are respectively connected to the two output terminals of the power supply circuit; the five-phase transformer circuit has a plurality of transformers, each of which has a first input terminal, a second input terminal, a first output terminal and a second output terminal, the second input terminal of each transformer is connected to the first input terminal of the next transformer, and the second output terminal of the last transformer is connected to the first input terminal of the next transformer. The input end is connected to the first input end of the first transformer, and the first input end of each of the transformers is correspondingly connected to an output end of the five-phase chopper circuit through a resonant circuit; the five-phase rectifier circuit has multiple input ends, a first common output end and a second common output end, and the filter circuit has a first common input end, a second common input end and an output end; the first output end of each of the transformers is correspondingly connected to an input end of the five-phase rectifier circuit, and the second output ends of each of the transformers are connected to each other, the first common output end and the second common output end of the five-phase rectifier circuit are respectively correspondingly connected to the first common input end and the second common input end of the filter circuit, and the output end of the filter circuit is connected to a load.

[0006] Optionally, the five-phase chopper circuit includes a three-level five-phase chopper circuit or a two-level five-phase chopper circuit.

[0007] Optionally, the two-level five-phase chopper circuit includes five first switch branches connected in parallel, each of the first switch branches includes a first switch tube and a second switch tube; the first ends of the first switch tubes are connected to form a first common input end of the two-level five-phase chopper circuit, and the second ends of the second switch tubes are connected to form a second common input end of the two-level five-phase chopper circuit; wherein, in the same first switch branch, the second end of the first switch tube and the first end of the second switch tube are connected to form an output end of the two-level five-phase chopper circuit, and the control ends of the first switch tube and the second switch tube are both connected to the control circuit.

[0008] Optionally, the three-level five-phase chopper circuit includes five second switch branches connected in parallel, and each of the second switch branches includes: a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, as well as a first power semiconductor device and a second power semiconductor device; wherein, in the same second switch branch, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are connected in series in sequence, and the first ends of the third switch tubes are connected to form a first common input end of the three-level five-phase chopper circuit, and the second ends of the sixth switch tubes are connected to form a second common input end of the three-level five-phase chopper circuit; the second end of the first power semiconductor device is connected to the a first end of a second power semiconductor device, a first end of the first power semiconductor device is connected in series between the third switch tube and the fourth switch tube, a second end of the second power semiconductor device is connected in series between the fifth switch tube and the sixth switch tube, and the second end of the first power semiconductor device and the first end of the second power semiconductor device are connected to form a third common input end of the three-level five-phase chopper circuit; the fourth switch tube and the fifth switch tube in the same second switch branch are connected to form an output end of the three-level five-phase chopper circuit, and the control ends of the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are all connected to the control circuit.

[0009] Optionally, the five-phase transformer circuits all include the first transformer to the fifth transformer; wherein the second input ends of the first transformer to the fifth transformer and the first input end of the next transformer are connected end to end in sequence, the second input end of the fifth transformer is connected to the first input end of the first transformer, and the five first input ends of the first transformer to the fifth transformer are respectively connected to the output ends of the five-phase chopper circuit through the resonant circuits; the second output ends of the first transformer to the fifth transformer are connected to the first output end of the next transformer, the second output end of the fifth transformer is connected to the first output end of the first transformer, and the first output ends of the first transformer to the fifth transformer are respectively connected to the input ends of the five-phase rectifier circuit; or, the second output ends of the first transformer to the fifth transformer are connected to each other, and the first output ends of the first transformer to the fifth transformer are respectively connected to the input ends of the five-phase rectifier circuit.

[0010] Optionally, the resonant circuit includes a plurality of series / parallel inductance circuits and capacitance circuits.

[0011] Optionally, the five-phase rectifier circuit includes five parallel rectifier branches, each of the rectifier branches includes a third power semiconductor device and a fourth power semiconductor device; the first end of each of the third power semiconductor devices is connected to form a first common output end of the five-phase rectifier circuit, and the second end of each of the fourth power semiconductor devices is connected to form a second common output end of the five-phase rectifier circuit; the second end of the third power semiconductor device and the first end of the fourth power semiconductor device of each rectifier branch are connected to form each input end of the five-phase rectifier circuit.

[0012] Optionally, the filtering circuit includes: a differential-mode inductor, a first end of which is connected to the first common output end of the five-phase rectifier circuit; a first filtering branch, a first end of which is connected to the second end of the differential-mode inductor, and a second end of which is connected to the second common output end of the five-phase rectifier circuit; a common-mode inductor, including a first winding and a second winding, the first end of the first winding and the first end of the second winding being respectively connected to the first end and the second end of the first filtering branch; and a second filtering branch, a first end and a second end of which are respectively connected to the second end of the first winding of the common-mode inductor and the second end of the second winding of the common-mode inductor.

[0013] Optionally, the five-phase power converter includes multiple five-phase chopper circuits, multiple resonant circuits, multiple five-phase transformer circuits, multiple five-phase rectifier circuits, a filter circuit and a power supply circuit; wherein each of the five-phase chopper circuits is connected in parallel, and the first common input terminal and the second common input terminal of each of the five-phase chopper circuits after being connected in parallel are respectively connected to the two output terminals of the power supply circuit; or, the second common input terminal of each of the five-phase chopper circuits is connected to the first common input terminal of the next five-phase chopper circuit, and the first common input terminal of the first five-phase chopper circuit and the second common input terminal of the last five-phase chopper circuit are respectively connected to the two output terminals of the power supply circuit; the output terminals of each of the five-phase rectifier circuits are connected in parallel and connected to the input terminal of the filter circuit.

[0014] Optionally, the pentagonally connected five-phase power converter also includes: an input filter capacitor, connected in parallel between the first common input terminal and the second common input terminal of the five-phase chopper circuit; an output filter capacitor, connected in parallel between the first common output terminal and the second common output terminal of the five-phase rectifier circuit; and a power supply filter capacitor, connected in parallel to the output terminal of the power supply circuit.

[0015] In order to achieve the above-mentioned purpose, the present application also provides a charging device, including a pentagonally connected five-phase power converter.

[0016] The embodiment of the present application proposes a pentagonally connected five-phase power converter and charging device, in which the multi-level output ends of the power supply circuit are respectively connected to the input ends of the five-phase chopper circuit, so that the technology of connecting multiple power tubes in parallel can be eliminated, and the problem of uneven current failure caused by parallel connection can be reduced; the five output ends of each five-phase chopper circuit are respectively connected to the input ends of five resonant circuits; the output ends of the five resonant circuits are respectively connected to the five input ends of the five-phase transformer circuit; the five output ends of each five-phase transformer circuit are respectively connected to the five input ends of a five-phase rectifier circuit, and the two output ends of each five-phase rectifier circuit after being connected in parallel are connected to the two input ends of the filter circuit. The utility model can greatly reduce the generation of ripple voltage and ripple current through the pentagonally connected five-phase power converter, which is more than 50% less than the ripple voltage generated by the H-bridge. The technology of connecting multiple power tubes in parallel is not used, which can reduce the problem of uneven current failure caused by parallel connection, and the topological level series and parallel expansion is performed, which makes it easy to achieve a larger power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural block diagram of a five-phase power converter with two levels and a pentagonal connection connected in series provided in one embodiment of the present application;

[0018] Figure 2 A structural block diagram of a two-level pentagonal five-phase power converter connected in parallel provided by an embodiment of the present application;

[0019] Figure 3 A structural block diagram of a five-phase power converter with two-level pentagonal connection without series-parallel connection provided by an embodiment of the present application;

[0020] Figure 4 A structural block diagram of a three-level pentagonal-connected five-phase power converter without series-parallel connection provided by an embodiment of the present application;

[0021] Figure 5 A structural diagram of a two-level pentagonal five-phase converter chopper circuit provided in one embodiment of the present application;

[0022] Figure 6 A structural diagram of a three-level pentagonal five-phase converter chopper circuit provided in one embodiment of the present application;

[0023] Figure 7 A structural diagram of a five-phase transformer with a pentagonal primary connection and a star secondary connection provided in an embodiment of the present application;

[0024] Figure 8 A structural diagram of a five-phase transformer with a primary pentagonal connection and a secondary pentagonal connection provided in an embodiment of the present application;

[0025] Fig. 9 A structural diagram of a five-phase rectifier circuit provided in one embodiment of the present application;

[0026] Fig.10 A structural diagram of a filter circuit provided in one embodiment of the present application.

[0027] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] 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.

[0029] It should be noted that the first, second, etc. orders of the embodiments of the present application are determined in sequence according to the flow direction of the power supply current.

[0030] Figure 1 A structural block diagram of a two-level pentagonal five-phase power converter connected in series according to an embodiment of the present application is provided. Figure 2 A block diagram of a five-phase power converter structure with two levels and a pentagonal connection connected in parallel provided in an embodiment of the present application. Figure 3 A structural block diagram of a five-phase power converter with two-level pentagonal connection without series-parallel connection provided by an embodiment of the present application, Figure 4 A structural block diagram of a three-level pentagonal five-phase power converter without series-parallel connection provided in an embodiment of the present application, referring to Figure 3A pentagonally connected five-phase power converter comprises: a power supply circuit 100, a five-phase chopper circuit 200, a resonant circuit 300, a five-phase transformer circuit 400, a five-phase rectifier circuit 500 and a filter circuit 600; the five-phase chopper circuit 200 has a first common input terminal, a second common input terminal and a plurality of output terminals, the first common input terminal and the second common input terminal of the five-phase chopper circuit 200 are respectively connected to the two output terminals of the power supply circuit 100; the five-phase transformer circuit 400 has a plurality of transformers, each transformer has a first input terminal, a second input terminal, a first output terminal and a second output terminal, the second input terminal of each transformer is connected to the first input terminal of the next transformer, and the first common input terminal of the last transformer is connected to the first common input terminal of the next transformer. The two input terminals are connected to the first input terminal of the first transformer, and the first input terminal of each transformer is connected to an output terminal of the five-phase chopper circuit 200 through a resonant circuit 300; the five-phase rectifier circuit 500 has multiple input terminals, a first common output terminal and a second common output terminal, and the filter circuit 600 has a first common input terminal, a second common input terminal and an output terminal; the first output terminal of each transformer is connected to an input terminal of the five-phase rectifier circuit 500, and the second output terminals of each transformer are connected to each other. The first common output terminal and the second common output terminal of the five-phase rectifier circuit 500 are respectively connected to the first common input terminal and the second common input terminal of the filter circuit 600, and the output terminal of the filter circuit 600 is connected to the load.

[0031] In the embodiment of the present application, the five-phase chopper circuit 200 includes a three-level five-phase chopper circuit 201 or a two-level five-phase chopper circuit 202. Among them, the multi-level five-phase chopper circuit can be a two-level five-phase chopper circuit 202, a three-level five-phase chopper circuit 201, and a five-phase chopper circuit with more than three levels. It should be understood that all the levels that the power supply circuit 100 can output are within the scope of the embodiment of the utility model, and no specific limitation is made here.

[0032] It should be noted that the technical embodiments of the present application greatly reduce the generation of ripple voltage and ripple current based on the principle of the topology itself, and the ripple voltage generated by the H-bridge is reduced by more than 50%; the technology of not using multiple power tubes in parallel can reduce the problem of uneven current failure caused by parallel connection; based on the embodiments of the application, the topology level series and parallel expansion is carried out, which makes it easy to realize the design of a larger power converter.

[0033] Figure 5 A two-level pentagonal five-phase converter chopper circuit structure diagram is provided in one embodiment of the present application, as shown in FIG. Figure 5As shown, in an embodiment of the present application, the two-level five-phase chopper circuit 202 includes five first switch branches connected in parallel, and each first switch branch includes a first switch tube Q1 and a second switch tube Q2; the first ends of the first switch tubes Q1 are connected to form a first common input end of the two-level five-phase chopper circuit 202, and the second ends of the second switch tubes Q2 are connected to form a second common input end of the two-level five-phase chopper circuit 202; wherein, in the same first switch branch, the second end of the first switch tube Q1 and the first end of the second switch tube Q2 are connected to form an output end of the two-level five-phase chopper circuit 202, and the control ends of the first switch tube Q1 and the second switch tube Q2 are both connected to the control circuit.

[0034] The first switch tube Q1 and the second switch tube Q2 in the first switch branch may be one of a triode, Si MOS, SiC MOS, and IGBT.

[0035] For example, reference Figure 5 , a five-phase power converter based on a two-level star connection is shown in Figure 5 As shown, five first switch branches connected in parallel form a five-phase bridge arm, and the control timing between each two adjacent phase bridge arms differs by 72°.

[0036] refer to Figure 3 and Figure 5 , the first switch tube Q1 located in the first first switch branch is Q1-1, the first switch tube Q1 located in the second second switch branch is Q1-2, the first switch tube Q1 located in the third second switch branch is Q1-3, the first switch tube Q1 located in the fourth second switch branch is Q1-4, and the first switch tube Q1 located in the fifth second switch branch is Q1-5, the second switch tube Q2 located in the first first switch branch is Q2-1, the second switch tube Q2 located in the second second switch branch is Q2-2, the second switch tube Q2 located in the third second switch branch is Q2-3, the second switch tube Q2 located in the fourth second switch branch is Q2-4, and the second switch tube Q2 located in the fifth second switch branch is Q2-5.

[0037] Figure 6 A three-level pentagonal five-phase converter chopper circuit structure diagram is provided in an embodiment of the present application, as shown in FIG. Figure 6As shown, the three-level five-phase chopper circuit 201 includes five second switch branches connected in parallel, each of which includes: a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5 and a sixth switch tube Q6, a first power semiconductor device D1 and a second power semiconductor device D2; the three-level five-phase chopper circuit 201 has a first common input terminal, a second common input terminal, a third common input terminal and five output terminals; wherein, in the same second switch branch, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are connected in series in sequence, the first end of each third switch tube Q3 is connected to form the first common input terminal of the three-level five-phase chopper circuit 201, and the second end of each sixth switch tube Q6 is connected to form the second common input terminal of the three-level five-phase chopper circuit 201 A common input terminal; the second end of the first power semiconductor device D1 is connected to the first end of the second power semiconductor device D2, the first end of the first power semiconductor device D1 is connected in series between the third switch tube Q3 and the fourth switch tube Q4, the second end of the second power semiconductor device D2 is connected in series between the fifth switch tube Q5 and the sixth switch tube Q6, and the second end of the first power semiconductor device D1 and the first end of the second power semiconductor device D2 are connected to form a third common input terminal of the three-level five-phase chopper circuit 201; in the same second switch branch, the fourth switch tube Q4 and the fifth switch tube Q5 are connected to form an output terminal of the three-level five-phase chopper circuit 201, and the control terminals of the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are all connected to the control circuit.

[0038] Specifically, a five-phase power converter based on a three-level star connection is Figure 6 As shown, each second switch branch constitutes a phase bridge arm, and the control timing between each two adjacent phase bridge arms differs by 72°. The third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 described in the embodiment of the present application are connected in series in sequence, which means that the second end of the third switch tube Q3 is connected to the first end of the fourth switch tube Q4, the second end of the fourth switch tube Q4 is connected to the first end of the fifth switch tube Q5, and the second end of the fifth switch tube Q5 is connected to the first end of the sixth switch tube Q6.

[0039] Exemplarily, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 can all be one or more of an NPN-type triode, a PNP-type triode, a Si MOS silicon MOSFET, a SiC MOS silicon carbide MOSFET or an IGBT insulated gate bipolar transistor. The first power semiconductor device D1 to the second power semiconductor device D2 can be one or more of a diode, a triode, SiMOS, SiCMOS, and an IGBT. In addition, it is worth noting that when the power semiconductor device is a diode, the cathode of the diode is the first end, and the anode of the diode is the second end.

[0040] refer to Figure 6 ,exist Figure 6 In the embodiment, the third switch tube Q3 in the first second switch branch is Q3-1, the third switch tube Q3 in the second second switch branch is Q3-2, the third switch tube Q3 in the third second switch branch is Q3-3, the third switch tube Q3 in the fourth second switch branch is Q3-4, the third switch tube Q3 in the fifth second switch branch is Q3-5, and the other fourth switch tubes Q4, fifth switch tubes Q5 and sixth switch tubes Q6 are similar and will not be described in detail here. Similarly, the first power semiconductor device in the first second switch branch is D1-1, the first power semiconductor device in the second second switch branch is D1-2, the first power semiconductor device in the third second switch branch is D1-3, the first power semiconductor device in the fourth second switch branch is D1-4, the first power semiconductor device in the fifth second switch branch is D1-5, and the other first power semiconductor devices and second power semiconductor devices are similar and will not be described in detail here.

[0041] In an embodiment of the present application, the five-phase transformer circuit 400 includes a first transformer to a fifth transformer, and the first transformer T1 to the fifth transformer T5 include a first input terminal, a second input terminal, a first output terminal and a second output terminal; wherein the second input terminals of the first transformer T1 to the fifth transformer T5 and the first input terminal of the next transformer are connected end to end in sequence, the second input terminal of the fifth transformer is connected to the first input terminal of the first transformer, and the five first input terminals of the first transformer T1 to the fifth transformer T5 are respectively connected to the output terminals of the five-phase chopper circuit 200 through the resonant circuit 300; the second output terminals of the first transformer to the fifth transformer are connected to the first output terminal of the next transformer, the second output terminal of the fifth transformer is connected to the first output terminal of the first transformer, and the first output terminals of the first transformer to the fifth transformer are respectively connected to the input terminals of the five-phase rectifier circuit 500; or, the second output terminals of the first transformer to the fifth transformer are connected to each other, and the first output terminals of the first transformer to the fifth transformer are respectively connected to the input terminals of the five-phase rectifier circuit 500.

[0042] Figure 7 A five-phase transformer structure diagram of a primary pentagonal connection and a secondary pentagonal connection is provided in an embodiment of the present application, as shown in FIG. Figure 7As shown, a five-phase transformer circuit 400 with a pentagonal primary connection and a star secondary connection includes a first transformer T1 to a fifth transformer T5, and each of the first transformer T1 to the fifth transformer T5 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal; wherein the first input terminal and the second input terminal of the first transformer T1 to the fifth transformer T5 are connected end to end in sequence, and the five first input terminals of the first transformer T1 to the fifth transformer T5 are connected to the five output terminals of the five-phase chopper circuit 200 through each resonant circuit 300; the first output terminal and the second output terminal of the first transformer T1 to the fifth transformer T5 are connected end to end in sequence, and the five first output terminals serve as the first output terminal to the fifth output terminal of the five-phase transformer circuit 400.

[0043] Figure 8 A five-phase transformer structure diagram with a primary pentagonal connection and a secondary star connection is provided in an embodiment of the present application, as shown in FIG. Figure 8 As shown, the five-phase transformer circuit 400 with the primary side connected in pentagon and the secondary side connected in star shape includes the first transformer T1 to the fifth transformer T5, and the first transformer T1 to the fifth transformer T5 each include a first input terminal, a second input terminal, a first output terminal and a second output terminal; wherein the first input terminal and the second input terminal of the first transformer T1 to the fifth transformer T5 are connected end to end in sequence, and the five first input terminals of the first transformer T1 to the fifth transformer T5 are respectively connected to the five output terminals of the five-phase chopper circuit 200 through the resonant circuits 300. The second output terminals of the first transformer T1 to the fifth transformer T5 are connected and the five first output terminals serve as the first output terminal to the fifth output terminal of the five-phase transformer circuit 400.

[0044] It is worth noting that the primary pentagonal connection can provide a more balanced load, reduce harmonics, improve the efficiency of the transformer, and reduce copper loss and iron loss. The pentagonal connection design is flexible and can adjust the voltage and current of each phase as needed. In a multi-phase system, the pentagonal connection helps reduce the imbalance of magnetic flux, thereby reducing the saturation magnetic loss of the magnetic core. The pentagonal connection naturally provides a neutral point, which can be used for grounding and provide electrical safety. It can also be used for load balancing, help reduce voltage fluctuations caused by load changes, and reduce the impact of certain specific harmonics, especially zero-sequence harmonics. Therefore, in a pentagonally connected five-phase power converter, the primary side uses a pentagon and the secondary side uses a star or pentagon, which has the above advantages.

[0045] refer to Figure 3 and Figure 4In the embodiment of the present application, the resonant circuit 300 includes an inductor circuit and a capacitor circuit connected in series and parallel. Specifically, the resonant circuit mainly includes at least one inductor and one capacitor; in addition to the LC circuit composed of an inductor and a capacitor in the resonant circuit, it also includes a resonant circuit composed of an inductor and two capacitors, and a resonant circuit composed of two inductors and capacitors; when the resonant circuit is composed of multiple inductors and multiple capacitors, the inductors and capacitors can be combined in series and parallel.

[0046] Fig. 9 A five-phase rectifier circuit structure diagram provided in an embodiment of the present application, refer to Fig. 9 In an embodiment of the present application, a five-phase rectifier circuit 500 includes five parallel rectifier branches, each rectifier branch includes a third power semiconductor device and a fourth power semiconductor device; the first end of each third power semiconductor device is connected to form a first common output end of the five-phase rectifier circuit 500, and the second end of each fourth power semiconductor device is connected to form a second common output end of the five-phase rectifier circuit 500; the second end of the third power semiconductor device and the first end of the fourth power semiconductor device of each rectifier branch are connected to form each input end of the five-phase rectifier circuit 500.

[0047] It should be noted that, among them, the third power semiconductor device D3 to the fourth power semiconductor device D4 can be one of a diode, a triode, SiMOS, SiCMOS, and an IGBT. In particular, when the power semiconductor device is a diode, the cathode of the diode is the first end, and the anode of the diode is the second end. The five input ends of each five-phase rectifier circuit 500 are connected to the first output end of each five-phase transformer in a one-to-one correspondence, the number of five-phase rectifier circuits 500 is the same as the number of five-phase transformers and the number of five-phase chopper circuits 200, and the number of resonant circuits 300 is the same as the number of output ends of the five-phase chopper circuit 200, wherein the number of output ends of each five-phase chopper circuit 200 is five.

[0048] refer to Fig. 9 and Figure 4 The third power semiconductor device in the first rectifier branch is D3-1, the third power semiconductor device in the second rectifier branch is D3-2, the third power semiconductor device in the third rectifier branch is D3-3, the third power semiconductor device in the fourth rectifier branch is D3-4, the third power semiconductor device in the fifth rectifier branch is D3-5, and the fourth power semiconductor device is similar and will not be repeated here.

[0049] Fig.10 The filter circuit structure diagram provided in one embodiment of the present application is shown in FIG. Fig.10 , Figure 3 , Figure 4In an embodiment of the present application, the filter circuit 600 may include a differential mode inductor L1, a first filter branch, a common mode inductor L2 and a second filter branch, wherein the first end of the differential mode inductor L1 is connected to the first common output end of the five-phase rectifier circuit; the first filter branch includes: a first capacitor C1, a third capacitor C3 and a fourth capacitor C4, wherein one end of the first capacitor C1 is connected to the second end of the differential mode inductor L1, and the other end of the first capacitor C1 is connected to the second common output end of the five-phase rectifier circuit; one end of the fourth capacitor C4 is grounded, and the other end is connected to the second common output end of the five-phase rectifier circuit; one end of the third capacitor C3 is connected to the differential mode inductor L1, and the other end is connected to the second common output end of the five-phase rectifier circuit. The second end of L1 and the other end are grounded; the common mode inductor L2 includes a first winding and a second winding, the first end of the first winding and the first end of the second winding are respectively connected to the first end and the second end of the first filter branch; the second filter branch includes: a second capacitor C2, a fifth capacitor C5 and a sixth capacitor C6, wherein the two ends of the second capacitor C2 are respectively connected to the second end of the first winding and the second end of the second winding of the common mode inductor L2; one end of the fifth capacitor C5 is connected to the second end of the first winding of the common mode inductor L2, and the other end is grounded; one end of the sixth capacitor C6 is connected to the second end of the second winding of the common mode inductor L2, and the other end is grounded. It should be understood that the second end of the first winding of the common mode inductor L2 and the second end of the second winding are used as two output ends of the filter circuit 600, connected to the load.

[0050] In the implementation of the present application, the five-phase power converter includes multiple five-phase chopper circuits 200, multiple resonant circuits 300, multiple five-phase transformer circuits 400, multiple five-phase rectifier circuits 500, a filter circuit 600 and a power supply circuit 100, wherein each of the five-phase chopper circuits 200 is connected in parallel, and the first common input terminal and the second common input terminal of each of the five-phase chopper circuits 200 after being connected in parallel are respectively connected to the two output terminals of the power supply circuit 100; or, the second common input terminal of each of the five-phase chopper circuits 200 is connected to the first common input terminal of the next five-phase chopper circuit 200, and the first common input terminal of the first five-phase chopper circuit 200 and the second common input terminal of the last five-phase chopper circuit 200 are respectively connected to the two output terminals of the power supply circuit 100; the output terminals of each of the five-phase rectifier circuits 500 are connected in parallel to the input terminal of the filter circuit 600.

[0051] It is worth noting that when the input of the five-phase chopper circuit 200 is two-level, the two-level five-phase chopper circuit 202 has a first common input terminal and a second common input terminal. When the input of the five-phase chopper circuit 200 is three-level, the three-level five-phase chopper circuit 201 has a first common input terminal, a second common input terminal and a third common input terminal.

[0052] Specifically, a two-level pentagon-connected five-phase power converter is taken as an example for exemplary description. The two-level pentagon-connected five-phase power converter may include five structures.

[0053] refer to Figure 1 , the first structure: each of the five-phase chopper circuits 200 is connected in parallel, that is, the first common input end of the five-phase chopper circuit 200 is connected to the first end of the DC input power supply, and the second common input end of each of the five-phase chopper circuits 200 is connected to the second end of the DC input power supply. Each of the five-phase chopper circuits 200 includes a plurality of output ends, the first input end of each transformer of each five-phase transformer circuit 400 is connected to each output end of the five-phase chopper circuit 200 through a resonant circuit 300, the second input end of each transformer in the same five-phase transformer circuit 400 is connected to the first input end of the next transformer, and the second input end of the last transformer of each five-phase transformer circuit 400 is connected to the first input end of the first transformer; the second ends of each five-phase transformer circuit 400 are connected to each other, and the first output end of each five-phase transformer circuit 400 is connected to each input end of the five-phase rectifier circuit 500.

[0054] The difference between the second structure and the first structure is that the secondary side connection of the five-phase transformer circuit 400 is a pentagonal connection.

[0055] refer to Figure 2 The difference between the third structure and the first structure is that the second common input terminal of the five-phase chopper circuit 200 of each conversion unit and the first common input terminal of the next five-phase chopper circuit 200 are cascaded in sequence.

[0056] The fourth structure differs from the third structure in that the secondary sides of the five-phase transformer circuit 400 are connected in a pentagonal shape.

[0057] Take the three-level pentagon-connected five-phase power converter as an example, refer to Figure 4 In the figure, the secondary side of the transformer is star-connected and the primary side is pentagon-connected. The power supply circuit 100 has three output terminals, and the five-phase chopper circuit 200 has three input terminals, wherein two input terminals of the five-phase chopper circuit 200 are connected to two output terminals of the power supply circuit 100 correspondingly, and the third input terminal of the five-phase chopper circuit 200 is connected to the third output terminal of the power supply circuit 100.

[0058] In an embodiment of the present application, the pentagonally connected five-phase power converter further includes an input filter capacitor, an output filter capacitor, and a power filter capacitor, wherein the input filter capacitor is connected in parallel to the input end of the five-phase chopper circuit 200; the output filter capacitor is connected in parallel to the output end of the five-phase rectifier circuit 500; and the power filter capacitor is connected in parallel to the two output ends of the power circuit 100 of the five-phase chopper circuit. The input filter capacitor, the output filter capacitor, and the power filter capacitor are used for filtering and rectifying the input end, the output end, and the power supply, respectively.

[0059] On the basis of the above-mentioned embodiment, the embodiment of the present application further provides a charging device, including a pentagonally connected five-phase power converter.

[0060] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made 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. A pentagonally connected five-phase power converter, characterized in that: include: A power supply circuit (100), a five-phase chopper circuit (200), a resonance circuit (300), a five-phase transformer circuit (400), a five-phase rectifier circuit (500) and a filter circuit (600); The five-phase chopper circuit (200) has a first common input terminal, a second common input terminal and a plurality of output terminals, and the first common input terminal and the second common input terminal of the five-phase chopper circuit (200) are respectively connected to two output terminals of the power supply circuit (100); The five-phase transformer circuit (400) has a plurality of transformers, each of the transformers having a first input end, a second input end, a first output end, and a second output end, the second input end of each transformer being connected to the first input end of the next transformer, and the second input end of the last transformer being connected to the first input end of the first transformer, and the first input end of each transformer being correspondingly connected to an output end of the five-phase chopper circuit (200) via a resonant circuit (300); The five-phase rectifier circuit (500) has a plurality of input terminals, a first common output terminal and a second common output terminal, and the filter circuit (600) has a first common input terminal, a second common input terminal and an output terminal; The first output end of each transformer is correspondingly connected to an input end of the five-phase rectifier circuit (500), the second output ends of each transformer are connected to each other, the first common output end and the second common output end of the five-phase rectifier circuit (500) are respectively correspondingly connected to the first common input end and the second common input end of the filter circuit (600), and the output end of the filter circuit (600) is connected to a load.

2. The pentagonally connected five-phase power converter according to claim 1, characterized in that: The five-phase chopper circuit (200) comprises a three-level five-phase chopper circuit (201) or a two-level five-phase chopper circuit (202).

3. The pentagonally connected five-phase power converter according to claim 2, characterized in that: The two-level five-phase chopper circuit (202) comprises five first switch branches connected in parallel, each of the first switch branches comprises a first switch tube and a second switch tube; The first ends of the first switch tubes are connected to form a first common input end of the two-level five-phase chopper circuit (202), and the second ends of the second switch tubes are connected to form a second common input end of the two-level five-phase chopper circuit (202); Wherein, in the same first switch branch, the second end of the first switch tube and the first end of the second switch tube are connected to form an output end of the two-level five-phase chopper circuit (202), and the control ends of the first switch tube and the second switch tube are both connected to a control circuit.

4. The pentagonally connected five-phase power converter according to claim 2, characterized in that: The three-level five-phase chopper circuit (201) comprises five second switch branches connected in parallel, each of the second switch branches comprises: a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube, and a first power semiconductor device and a second power semiconductor device; Wherein, in the same second switch branch, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are sequentially connected in series, the first ends of the third switch tubes are connected to form a first common input end of the three-level five-phase chopper circuit (201), and the second ends of the sixth switch tubes are connected to form a second common input end of the three-level five-phase chopper circuit (201); The second end of the first power semiconductor device is connected to the first end of the second power semiconductor device, the first end of the first power semiconductor device is connected in series between the third switch tube and the fourth switch tube, the second end of the second power semiconductor device is connected in series between the fifth switch tube and the sixth switch tube, and the second end of the first power semiconductor device and the first end of the second power semiconductor device are connected to form a third common input end of the three-level five-phase chopper circuit (201); The fourth switch tube and the fifth switch tube in the same second switch branch are connected to form an output end of the three-level five-phase chopper circuit (201), and the control ends of the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are all connected to the control circuit.

5. The pentagonally connected five-phase power converter according to claim 1, characterized in that: The five-phase transformer circuit (400) comprises first to fifth transformers; The second input ends of the first transformer to the fifth transformer and the first input end of the next transformer are connected end to end in sequence, the second input end of the fifth transformer is connected to the first input end of the first transformer, and the five first input ends of the first transformer to the fifth transformer are respectively connected to the output ends of the five-phase chopper circuit (200) through the resonant circuits (300); The second output ends of the first transformer to the fifth transformer are connected to the first output end of the next transformer, the second output end of the fifth transformer is connected to the first output end of the first transformer, and the first output ends of the first transformer to the fifth transformer are respectively connected to the input ends of the five-phase rectifier circuit (500); Alternatively, the second output ends of the first transformer to the fifth transformer are connected to each other, and the first output ends of the first transformer to the fifth transformer are respectively connected to the input ends of the five-phase rectifier circuit (500).

6. The pentagonally connected five-phase power converter according to claim 5, characterized in that: The resonant circuit (300) comprises a plurality of inductance circuits and capacitance circuits connected in series or in parallel.

7. The pentagonally connected five-phase power converter according to claim 6, characterized in that: The five-phase rectifier circuit (500) comprises five parallel rectifier branches, each of which comprises a third power semiconductor device and a fourth power semiconductor device; The first ends of the third power semiconductor devices are connected to form a first common output end of the five-phase rectifier circuit (500), and the second ends of the fourth power semiconductor devices are connected to form a second common output end of the five-phase rectifier circuit (500); The second end of the third power semiconductor device and the first end of the fourth power semiconductor device of each rectifying branch are connected to form each input end of the five-phase rectifying circuit (500).

8. The pentagonally connected five-phase power converter according to claim 7, characterized in that: The filtering circuit (600) comprises: A differential mode inductor, a first end of which is connected to a first common output end of the five-phase rectifier circuit (500); A first filtering branch, a first end of which is connected to the second end of the differential mode inductor, and a second end of which is connected to the second common output end of the five-phase rectifier circuit (500); A common mode inductor, comprising a first winding and a second winding, wherein a first end of the first winding and a first end of the second winding are respectively connected to a first end and a second end of the first filter branch; The second filtering branch has a first end and a second end connected to the second end of the first winding of the common-mode inductor and the second end of the second winding of the common-mode inductor respectively.

9. The pentagonally connected five-phase power converter according to any one of claims 1 to 8, characterized in that: The five-phase power converter comprises a plurality of five-phase chopper circuits (200), a plurality of resonant circuits (300), a plurality of five-phase transformer circuits (400), a plurality of five-phase rectifier circuits (500), a filter circuit (600) and a power supply circuit (100); Wherein, each of the five-phase chopper circuits (200) is connected in parallel, and the first common input terminal and the second common input terminal of each of the five-phase chopper circuits (200) connected in parallel are respectively connected to the two output terminals of the power supply circuit (100); Alternatively, the second common input end of each of the five-phase chopper circuits (200) is connected to the first common input end of the next five-phase chopper circuit (200), and the first common input end of the first five-phase chopper circuit (200) and the second common input end of the last five-phase chopper circuit (200) are respectively connected to the two output ends of the power supply circuit (100); The output ends of the five-phase rectifier circuits (500) are connected in parallel and then connected to the input end of the filter circuit (600).

10. The pentagonally connected five-phase power converter according to claim 1, characterized in that: The pentagonally connected five-phase power converter further comprises: An input filter capacitor connected in parallel between a first common input terminal and a second common input terminal of the five-phase chopper circuit (200); An output filter capacitor connected in parallel between the first common output terminal and the second common output terminal of the five-phase rectifier circuit (500); A power supply filter capacitor is connected in parallel to the output end of the power supply circuit (100).

11. A charging device, characterized in that: A five-phase power converter comprising a pentagonal connection as described in any one of claims 1-10.

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