Power converter and power supply device
By using delta-connected three-phase windings and electrical connectors in a three-phase transformer to form a closed-loop circuit with an angle, the loss and heat generation problems caused by asymmetry in the three-phase transformer are solved, thereby improving the efficiency and energy density of the power converter.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUAWEI TECH CO LTD
- Filing Date
- 2026-03-27
- Publication Date
- 2026-07-21
Smart Images
Figure CN122437389A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power conversion technology, and in particular to a power converter and power supply device. Background Technology
[0002] With the increasing demand for high energy density and high power in power supply equipment, the advantages of power converters are becoming more and more prominent. They have advantages such as simple structure, low current ripple, high efficiency, and high power density, and have a very wide range of applications.
[0003] In power converters, the three-phase primary windings of a three-phase transformer can be connected in either a star or delta configuration. Similarly, the three-phase secondary windings can also be connected in either a star or delta configuration. When either the primary or secondary windings are connected in a delta configuration, a closed-loop circuit is formed. If there is an asymmetry in the three-phase voltage or parameters of the power converter (such as device parameter deviation or control phase offset), a leakage magnetic field will be generated during energy transfer. This leakage magnetic field will form a circulating current through the closed-loop circuit. This circulating current does not participate in energy transfer, but it will generate additional losses in the windings and switching transistors of the power converter, reducing overall efficiency and increasing the heat load on the windings. The magnetic field generated by the circulating current will also cause eddy current losses in the copper foil on the main power board. Summary of the Invention
[0004] This application provides a power converter and power supply device, which aims to reduce the energy loss of the power converter during operation and improve the working efficiency of the power converter.
[0005] In a first aspect, this application provides a power converter, comprising a main power board, a three-phase transformer, and electrical connectors. The three-phase transformer is disposed on one surface of the main power board and includes three-phase windings. Each phase winding includes two pins, and the two pins of one phase winding are respectively connected to one pin of each of the other two phase windings to form a delta connection between the three phase windings. Among the multiple interconnected sets of pins, the electrical connectors are connected between two pins of one set of pins. The two pins of one set of pins are disposed on the surface of the main power board, and the electrical connectors protrude from the two pins of one set of pins along the thickness direction of the main power board. Among the multiple pins of the three-phase windings, two interconnected pins form a set. The two pins in a set of pins belong to different phase windings. For example, if one pin of one phase winding is connected to one pin of another phase winding, then these two pins form a set of pins.
[0006] In this design, two pins of one set of pins are positioned on the surface of the main power board. Electrical connectors protrude from these two pins along the thickness of the main power board. The closed-loop circuit formed by the delta connection of the three-phase windings forms an angle with the surface of the main power board (it is not parallel to the surface). If the three-phase parameters of the three-phase windings are asymmetrical, circulating currents will exist in the closed-loop circuit. These circulating currents will generate interfering magnetic fields. Because the closed-loop circuit forms an angle with the surface of the main power board, the interfering magnetic field is not perpendicular to the surface of the main power board. This reduces the eddy currents generated by the interfering magnetic field on the main power board, thereby reducing the damage of eddy currents to the circuits and components on the main power board. The presence of eddy currents on the main power board can easily cause it to overheat. Reducing the eddy currents generated by the interfering magnetic field on the main power board can alleviate the overheating problem and improve the operating stability and lifespan of the main power board.
[0007] In conjunction with the first aspect, in one possible implementation, the distance between two pins in one set of pins is greater than the distance between two pins in any of the other sets of pins. This results in a longer current-carrying path for the electrical connector in the closed-loop circuit. Furthermore, because the connector protrudes from one set of pins, the circulating current will be significantly deflected relative to the surface of the main power board. This creates a larger effective angle between the equivalent closed-loop circuit containing the circulating current and the surface of the main power board, further reducing the eddy currents generated by the interfering magnetic field on the main power board.
[0008] In conjunction with the first aspect, in one possible implementation, the two pins of each winding are arranged at intervals and the pins of the three-phase winding are arranged sequentially. One set of pins includes two pins located at both ends. An electrical connector is connected between the two pins located at both ends, which can further increase the current path of the electrical connector, increase the effective angle between the equivalent closed loop of the circulating current and the surface of the main power board, and further reduce the eddy current generated by the interference magnetic field on the main power board.
[0009] In conjunction with the first aspect, in one possible implementation, the electrical connector protrudes from the main power board. The electrical connector includes a first connection end and a second connection end, which are connected to the main power board. Two pins of one set are connected to the first connection end and the second connection end respectively through the main power board. The electrical connector can be directly fixed on the main power board, which facilitates the installation of the electrical connector. At the same time, it ensures that there is a certain distance between the electrical connector and the two phase windings connected to it, which can reduce the mutual interference between the electrical connector and the two phase windings connected to it.
[0010] In conjunction with the first aspect, in one possible implementation, multiple sets of pins are positioned on one side of the three-phase transformer, and the electrical connectors are positioned parallel to one side of the three-phase transformer. This ensures that the electrical connectors and the three-phase transformer do not interfere with each other, improving the structural compactness of the power converter and thus increasing its energy density. When the three-phase transformer is operating, if the three-phase parameters of the three-phase windings are asymmetrical, the transformer will generate a leakage magnetic field. This leakage magnetic field passes through the closed loop formed by the three-phase windings, inducing an electromotive force in the closed loop and increasing the circulating current. Positioning the electrical connectors parallel to one side of the three-phase transformer reduces the area of the closed loop formed by the three-phase windings, thereby reducing the magnetic flux of the leakage magnetic field passing through the closed loop. The reduced magnetic flux of the leakage magnetic field through the closed loop decreases the induced electromotive force generated in the closed loop, consequently reducing the circulating current. This also reduces the interference magnetic field generated by the circulating current in the closed loop, further reducing the eddy currents generated by the interference magnetic field on the main power board.
[0011] In conjunction with the first aspect, in one possible implementation, the transformer includes a housing that extends beyond the pins of the three-phase windings along the thickness direction of the main power board. Electrical connectors are located within the housing of the three-phase transformer, with the portions of two pins of one set of pins within the housing connected via the electrical connectors. Integrating the electrical connectors within the three-phase transformer reduces the size of the power converter and increases its energy density.
[0012] In conjunction with the first aspect, in one possible implementation, the electrical connector is one of a vertical plate, a copper busbar, or an aluminum busbar. The electrical connector can effectively utilize the area protruding from one of the sets of pins to conduct electricity, so that the closed loop formed by the three-phase winding has an angle (greater than 0°) with the first surface, reducing the magnetic flux of the magnetic field perpendicular to the first surface through the closed loop, thereby reducing the circulating current generated in the closed loop due to the leakage magnetic field.
[0013] In conjunction with the first aspect, in one possible implementation, the electrical connector includes a vertical plate with at least one current-carrying path, and at least one set of pins in a plurality of sets of pins is connected to at least one current-carrying path in a one-to-one correspondence. Since one set of pins protrudes from the vertical plate along the thickness direction of the main power board, the closed loop formed by the three-phase winding delta connection forms an angle with the surface of the main power board. The interference magnetic field generated by the circulating current in the closed loop also forms an angle with the surface of the main power board (the interference magnetic field is not perpendicular to the surface of the main power board). This reduces the eddy currents generated by the interference magnetic field on the main power board, thereby reducing the damage of eddy currents to the circuits and components on the main power board. If the vertical plate includes two or more current-carrying paths, the area of the closed loop formed by the three-phase winding can be reduced, thereby reducing the magnetic flux of the leakage magnetic field passing through the closed loop, reducing the circulating current generated by the closed loop, reducing the interference magnetic field generated by the circulating current, and further reducing the eddy currents generated by the interference magnetic field on the main power board.
[0014] Secondly, this application provides a power supply device, which includes a plurality of power converters as described in the first aspect, wherein the plurality of power converters are connected in parallel or in series. Attached Figure Description
[0015] Figure 1 A circuit diagram of a three-phase LLC resonant converter provided in one embodiment of this application; Figure 2 A side view of a power converter provided in an embodiment of this application; Figure 3 A top view of a power converter provided in an embodiment of this application; Figure 4 An equivalent schematic diagram of a power converter in which three-phase windings are connected in a delta configuration to form a closed loop, provided in an embodiment of this application; Figure 5 A side view of another power converter provided in an embodiment of this application; Figure 6 A top view of another power converter provided in one embodiment of this application; Figure 7 This is an equivalent schematic diagram of a three-phase winding delta connection forming a closed loop in another power converter provided in an embodiment of this application.
[0016] Explanation of reference numerals in the attached figures: 1. Three-phase LLC resonant converter; 10. Power converter; 100. Main power board; 110. First surface; 120. Second surface; 130. Three-phase inverter circuit; 140. Three-phase resonant circuit; 150. Three-phase rectifier circuit; 200. Three-phase transformer; 210. Winding; 220. Pin; 230. Closed-loop circuit; 240. Housing; 300. Electrical connector. Detailed Implementation
[0017] Power converters can achieve low ripple and high reliability in power conversion.
[0018] A power converter includes a three-phase transformer. The three-phase windings in the three-phase transformer can be connected in a star or delta configuration. The three-phase windings can be either three-phase primary windings or three-phase secondary windings.
[0019] If the three-phase primary winding or three-phase secondary winding in a three-phase transformer is connected in delta configuration, the three-phase primary winding or three-phase secondary winding will form a closed loop through the copper foil on the main power board. When there is asymmetry in the three-phase voltage or parameters (such as device parameter deviation or control phase offset), a leakage magnetic field will be generated during the energy transmission process of the three-phase transformer. The leakage magnetic field will form a circulating current through the closed loop. The circulating current does not participate in energy transmission and generates additional losses in the windings and switching transistors of the three-phase transformer, reducing the overall efficiency and increasing the heat load on the windings. The magnetic field generated by the circulating current will also cause eddy current losses in the copper foil on the main power board.
[0020] Therefore, embodiments of this application provide a power converter and power supply device, which aim to reduce the energy loss of the power converter during operation and improve the working efficiency of the power converter.
[0021] In the embodiments provided in this application, the power supply device includes multiple power converters, which are connected in parallel or in series.
[0022] In some embodiments, the power converter can be applied to a dual active bridge (DAB) converter or a three-phase LLC resonant converter. By controlling the resonant cavity frequency of the three-phase LLC resonant converter, the output voltage of the three-phase LLC resonant converter can be controlled and kept stable. Power conversion is achieved through the three-phase LLC resonant converter, and its output voltage can be controlled to adapt to electrical equipment with different rated voltages.
[0023] Please refer to the embodiments provided in this application. Figure 1 The three-phase LLC resonant converter 1 includes a three-phase resonant circuit 140, a three-phase rectifier circuit 150, and a power converter 10. The power converter 10 includes a main power board 100 and a three-phase transformer 200. The three-phase resonant circuit 140 and the three-phase rectifier circuit 150 are both disposed on the main power board 100, and the three-phase transformer 200 is connected between the three-phase resonant circuit 140 and the three-phase rectifier circuit 150.
[0024] In the embodiments provided in this application, the three-phase LLC resonant converter 1 may further include a three-phase inverter circuit 130. The three-phase resonant circuit 140 can be connected to the energy storage module through the three-phase inverter circuit 130. The energy storage module outputs DC power, and the three-phase inverter circuit 130 can convert DC power into AC power. The three-phase resonant circuit 140 can filter electrical signals of a specific frequency and filter interference signals, and send the filtered electrical signals to the three-phase transformer 200. The three-phase transformer 200 performs the transformation function and outputs AC power. The three-phase rectifier circuit 150 converts the AC power output by the three-phase transformer 200 into DC power, so that the three-phase LLC resonant converter 1 can convert DC power into DC power that has been filtered of noise and has a stable voltage.
[0025] The three-phase transformer 200 may include two sets of windings 210, each set of windings 210 including three-phase windings. One set of windings is the primary winding, and the other set is the secondary winding 210. Each set of windings may be connected in a star configuration or a delta configuration. In the embodiments provided in this application, at least one set of windings in the three-phase transformer 200 is connected in a delta configuration.
[0026] Please see Figure 2 , Figure 3 and Figure 4 Taking the three-phase windings of the three-phase transformer 200 as secondary windings as an example, the power converter 10 also includes an electrical connector 300. The three-phase transformer 200 is disposed on one surface of the main power board 100. The three-phase transformer 200 includes three-phase windings, each phase winding including two pins 220. The two pins 220 of one phase winding 210 are respectively connected to one pin 220 of each of the other two phase windings 210, so that the three-phase windings 210 form a delta connection. The delta connection of the three-phase windings 210 forms a closed loop 230. Among the multiple sets of interconnected pins 220, the electrical connector 300 is connected between the two pins 220 of one set of pins. The two pins 220 of one set of pins are disposed on the surface of the main power board 100, and the electrical connector protrudes from the two pins 220 of one set of pins along the thickness direction of the main power board 100.
[0027] Among the multiple pins 220 of the three-phase winding 210, two pins 220 that are connected to each other form a group. In a group of pins, the two pins 220 belong to different phase windings. For example, if one pin 220 of one phase winding 210 is connected to one pin 220 of another phase winding 210, then these two pins 220 form a group of pins.
[0028] Since two pins 220 of one set of pins are located on the surface of the main power board 100, the electrical connector 300 protrudes from the two pins 220 connected by the electrical connector 300 in the thickness direction of the main power board 100. The closed loop 230 formed by the three-phase winding delta connection forms an angle with the surface of the main power board 100 (not parallel to the surface of the main power board 100). If the three-phase parameters of the three-phase winding are asymmetrical, there will be circulating current in the closed loop 230. The circulating current will generate an interfering magnetic field. Since the closed loop 230 has an angle with the surface of the main power board 100, the interfering magnetic field is not perpendicular to the surface of the main power board 100. The eddy current generated by the interfering magnetic field on the main power board 100 will be reduced, thereby reducing the damage of the eddy current to the circuits and components on the main power board 100. Eddy currents exist on the main power board 100, which can easily cause it to overheat. Reducing the eddy currents generated on the main power board 100 by the interfering magnetic field can alleviate the overheating problem and improve its operational stability and lifespan. The main power board 100 can be a PCB board.
[0029] The main power board 100 may include a first surface 110 and a second surface 120, which are arranged opposite to each other. A three-phase transformer 200 is disposed on the first surface 110, and a set of pins 220 connected to the electrical connector is disposed on the first surface 110.
[0030] In some embodiments, among the multiple pins of the three-phase winding, some pins are located on the first surface of the main power board, while other pins are not located on the surface of the main power board.
[0031] In some embodiments, multiple pins 220 of the three-phase winding may be disposed on the first surface 110 of the main power board 100.
[0032] In the embodiments provided in this application, the three-phase winding is the secondary winding, and each set of pins 220 in the three-phase winding can output one phase of electricity together, while different sets of pins output different phases of electricity.
[0033] In some embodiments, a metal layer may be disposed on the first surface 110 of the main power board 100, and the pins 220 of each winding 210 can be electrically connected through the metal layer of the main power board 100. A three-phase inverter circuit 130, a three-phase resonant circuit 140, and a three-phase rectifier circuit 150 may be disposed on the metal layer, and a three-phase transformer 200 is connected between the three-phase resonant circuit 140 and the three-phase rectifier circuit 150. The input terminal of the three-phase resonant circuit 140 is connected to the three-phase inverter circuit 130, the output terminal of the three-phase resonant circuit 140 is connected to the input terminal of the three-phase transformer 200, and the output terminal of the three-phase transformer 200 is connected to the three-phase rectifier circuit 150. The electrical connector 300 has good conductivity and is electrically connected to both the metal layer and the metal layer of the main power board 100.
[0034] In some embodiments, the electrical connector 300 protrudes from the main power board 100. The electrical connector 300 includes a first connection end and a second connection end, which are connected to the main power board 100. Two pins 220 of one set are respectively connected to the first connection end and the second connection end through the main power board 100. The electrical connector 300 can be directly fixed to the main power board 100, which facilitates the installation of the electrical connector 300. At the same time, it provides a certain distance between the electrical connector 300 and the two phase windings connected to it, which can reduce the mutual interference between the electrical connector 300 and the two phase windings connected to it.
[0035] In the embodiments of this application, please refer to Figure 4 Electrical connector 300 is disposed on the first surface 110, and one set of pins 220 in the three-phase winding 210 is disposed on the first surface 110. In the thickness direction of the main power board 100, electrical connector 300 protrudes from one set of pins 220 in the three-phase winding 210. The area of electrical connector 300 extending in the thickness direction of the main power board 100 (perpendicular to the first surface 110) can be effectively utilized, which can save the area of the main power board 100 and improve the energy density of the power converter 10.
[0036] When the three-phase transformer 200 converts electrical energy through excitation, if there is an asymmetry in the three-phase voltage or parameters in the power converter, a leakage magnetic field will be generated during the energy transmission process of the three-phase transformer 200. If the three-phase parameters in the three-phase transformer 200 are asymmetrical, a leakage magnetic field will appear in the three-phase transformer 200. The leakage magnetic field has a component perpendicular to the first surface. Among them, the closed loop 230 formed by the angular connection of the three-phase windings 210 forms an angle with the first surface 110. The component of the leakage magnetic field perpendicular to the first surface also forms an angle with the closed loop 230. This can reduce the magnetic flux of the leakage magnetic field passing through the closed loop 230, thereby reducing the induced electromotive force generated by the leakage magnetic field in the closed loop 230, further reducing the circulating current in the closed loop 230, thereby reducing the interference magnetic field generated by the circulating current in the closed loop 230, and thus reducing the eddy current generated on the first surface 110 in the main power board 100.
[0037] In some embodiments, the axes of the three-phase windings 210 are all perpendicular to the first surface 110. If the parameters of the three-phase windings 210 are asymmetrical, the three-phase windings 210 will mainly generate a leakage magnetic field perpendicular to the first surface 110. The magnetic flux of the leakage magnetic field perpendicular to the first surface 110 passes through the closed loop 230 and will generate an induced electromotive force in the closed loop 230, which will increase the circulating current in the closed loop 230.
[0038] Because the closed-loop circuit 230 has an angle with the first surface 110, the leakage magnetic field mainly generated by the three-phase transformer 200 is not perpendicular to the closed-loop circuit 230. This reduces the magnetic flux of the leakage magnetic field passing through the closed-loop circuit 230, thereby reducing the induced electromotive force generated by the leakage magnetic field in the closed-loop circuit 230, further reducing the circulating current in the closed-loop circuit 230. This allows the power converter 10 to reduce damage caused by the circulating current and reduce the heat load on the three-phase winding 210. Furthermore, because each pair of adjacent windings 210 is electrically connected through the main power board 100, the height difference between the electrical connector 300 and the conductors between the two adjacent windings 210 can be increased. This increases the angle between the closed-loop circuit 230 and the first surface 110, further reducing the magnetic flux of the leakage magnetic field passing through the closed-loop circuit 230, reducing the circulating current in the closed-loop circuit 230, reducing the interference magnetic field generated by the circulating current in the closed-loop circuit 230, and reducing the eddy currents generated by the interference magnetic field on the main power board 100.
[0039] Please refer to the embodiments provided in this application. Figure 3The distance between the two pins 220 of one set of pins is greater than the distance between the two pins 220 of any other set of pins. In the closed loop 230, the electrical connector 300 has a longer current path. Since the electrical connector 300 protrudes from the two pins 220 of one set of pins, when the circulating current flows through the electrical connector 300, the circulating current will be deflected significantly relative to the surface of the main power board 100. The equivalent closed loop 230 where the circulating current is located will form a large effective angle with the surface of the main power board 100, and the eddy current generated by the interference magnetic field on the main power board will be further reduced.
[0040] In some embodiments, the distance between two pins 220 of one group of pins may be less than the distance between two pins 220 of any other group of pins.
[0041] The two pins 220 of each winding 210 are arranged at intervals and the pins 220 of the three-phase windings are arranged sequentially. One group of pins includes two pins 220 located at both ends. The closed loop 230 formed by the three-phase windings can still have an angle with the first surface 110 of the main power board 100.
[0042] For example, the three-phase windings 210 are arranged sequentially, and the pins 220 of the three-phase windings 210 are also arranged sequentially. The three-phase windings 210 are arranged in a straight line, and all the pins 220 in the three-phase windings 210 are also arranged in a straight line. The electrical connector is connected between two pins located at both ends. For example, the electrical connector 300 can be connected to the two pins 220 that are furthest apart in the three-phase windings 210, which can increase the conductive path of the electrical connector 300 in the closed loop 230, thereby increasing the effective angle between the closed loop 230 and the first surface 110, and further reducing the eddy currents generated by the interference magnetic field on the main power board 100.
[0043] In some embodiments, the three-phase windings 210 are arranged sequentially at intervals, and a plurality of pins 220 of the three-phase windings 210 are disposed on the first surface 110. Each pair of adjacent windings 210 are electrically connected through the main power board 100. Specifically, each pair of adjacent windings 210 can be electrically connected through the metal layer of the main power board 100. For example, the three-phase windings 210 are specifically a first winding, a second winding, and a third winding, which are arranged sequentially at intervals. Two adjacent pins 220 of the first winding and the second winding are electrically connected through the metal layer of the main power board 100, two adjacent pins 220 of the second winding and the third winding are electrically connected through the metal layer of the main power board 100, and two windings 210 that are opposite to each other in the first winding and the third winding are electrically connected through an electrical connector 300.
[0044] In some embodiments, the electrical connector 300 is spaced apart from the three-phase transformer 200, with multiple sets of pins disposed on one side of the three-phase transformer 200, and the electrical connector 300 is disposed parallel to one side of the three-phase transformer 200. The electrical connector 300 and the three-phase transformer 200 can operate without interference, improving the structural compactness of the power converter 10 and thus increasing its energy density. When the three-phase transformer 200 is operating, if the three-phase parameters of the three-phase windings are asymmetrical, the three-phase transformer 200 will generate a leakage magnetic field. This leakage magnetic field passes through the closed-loop circuit 230 formed by the three-phase windings, inducing an electromotive force in the closed-loop circuit 230 and increasing the circulating current in the closed-loop circuit 230. By aligning the electrical connector 300 parallel to one side of the three-phase transformer 200, the area of the closed-loop circuit 230 formed by the three-phase windings can be reduced, thereby reducing the magnetic flux of the leakage magnetic field passing through the closed-loop circuit in the three-phase transformer. As the magnetic flux of the leakage magnetic field through the closed loop decreases, the induced electromotive force generated by the closed loop decreases accordingly, the circulating current in the closed loop 230 also decreases, the interference magnetic field generated by the circulating current in the closed loop 230 is also reduced, and the eddy current generated by the interference magnetic field on the main power board 100 will be further reduced.
[0045] The statement that the electrical connector 300 is parallel to one side of the three-phase transformer 200 means that the electrical connector 300 is parallel to one side surface of the three-phase transformer 200. The parallelism mentioned here does not have to be absolute. An angular error is allowed between the electrical connector and one side of the three-phase transformer. For example, the angle between the electrical connector 300 and one side surface of the three-phase transformer 200 can be 0°-10°.
[0046] In some embodiments, the extension direction of the electrical connector 300 from the first connection end to the second connection end is parallel to the arrangement direction of the pins 220 of the three-phase winding 210. Two pins 220 at each end of the three-phase winding 210 are connected to the first connection end and the second connection end respectively via the main power board 100. For example, the three-phase windings 210 are a first winding 210, a second winding 210, and a third winding 210, arranged sequentially. The two pins 220 of the first winding 210, the two pins 220 of the second winding 210, and the two pins 220 of the third winding 210 are also arranged sequentially. Two adjacent pins 220 in the first winding 210 and the second winding 210 are electrically connected through the metal layer of the main power board 100. Two adjacent pins 220 in the second winding 210 and the third winding 210 are electrically connected through the metal layer of the main power board 100. One pin 220 in the first winding 210 opposite to the second winding 210 is connected to the first connection terminal through the metal layer of the main power board 100. One pin 220 in the third winding 210 opposite to the second winding 210 is connected to the second connection terminal through the metal layer of the main power board 100. The projection of the closed loop 230 formed by the triangular connection of the three-phase windings 210 onto the first surface 110 can be rectangular.
[0047] Since the extension direction of the electrical connector 300 from the first connection end to the second connection end is parallel to the arrangement direction of the pins 220 of the three-phase winding 210, the electrical connector 300 and the three-phase winding 210 can maintain a safe distance, thereby reducing the area of the closed loop 230 formed by the angled connection of the three-phase winding 210, reducing the magnetic flux of the leakage magnetic field (the magnetic field direction is perpendicular to the first surface 110) passing through the closed loop 230, and thus reducing the circulating current formed in the closed loop 230 due to the leakage magnetic field.
[0048] In some embodiments, the three-phase transformer 200 includes a housing 240, which extends beyond the pins 220 of the three-phase windings along the thickness direction of the main power board 100. An electrical connector 300 is located within the housing 240 of the three-phase transformer 200, wherein the portions of two pins 220 of a set of pins located within the housing 240 are connected by the electrical connector 300. The integration of the electrical connector 300 within the three-phase transformer 200 reduces the size of the power converter 10 and increases its energy density.
[0049] In the embodiments provided in this application, the electrical connector 300 is a stand plate, a copper busbar, or an aluminum busbar. The stand plate can be a PCB board. The electrical connector 300 can be fixed on the main power board 100 and electrically connected to the main power board 100. The electrical connector 300 can effectively utilize the space protruding from the first surface 110 to conduct electricity, so that the closed loop 230 formed by the three-phase winding 210 has an angle (greater than 0°) with the first surface 110, reducing the magnetic flux of the magnetic field perpendicular to the first surface 110 through the closed loop 230, thereby reducing the circulating current generated in the closed loop 230 due to the leakage magnetic field.
[0050] Taking the electrical connector 300 as an example, the upright plate is perpendicular to the main power board 100. The upright plate is fixedly connected to the first surface 110. Copper foil is provided on the side of the upright plate facing the three-phase transformer 200 and / or the side facing away from the three-phase transformer 200. The copper foil is connected to the pin 220 of the first winding 210 away from the second winding 210 through the main power board 100. The copper foil is also connected to the second connection terminal through the pin 220 of the third winding 210 away from the second winding 210 through the main power board 100.
[0051] Since the vertical plate is disposed on the first surface 110, when the pins 220 of the first winding 210 that are far away from the second winding 210 and the pins 220 of the third winding 210 that are far away from the second winding 210 conduct electricity through the vertical plate, the closed loop 230 formed by the three-phase windings 210 can have an angle with the first surface 110, thereby reducing the magnetic flux of the magnetic field perpendicular to the first surface 110 passing through the closed loop 230, and thus reducing the circulating current generated in the closed loop 230 due to the leakage magnetic field.
[0052] Some circuits that were originally set on the main power board 100 can also be arranged on the stand plate to reduce the area of the main power board 100 and thus improve the energy density of the three-phase LLC resonant converter 1.
[0053] The first connection end of the upright board is provided with pin 220, and the second connection end of the upright board is provided with pin 220. In the PCB, the pin 220 of the first connection end is connected to the copper foil and the main power board 100, and the pin 220 of the second connection end of the PCB is connected to the copper foil and the main power board 100.
[0054] The main power board 100 and the copper foil of the stand plate can be electrically connected through pin 220. Pin 220 can be soldered onto the main power board 100 and can also be used to fix the stand plate to the main power board 100.
[0055] The stand-up board includes at least one current path, and at least one set of pins in a plurality of pin groups is connected to at least one current path in a one-to-one correspondence. The stand-up board may have one current path, which connects to any one of the three sets of pins. The stand-up board may have two current paths, each connecting to its corresponding set of pins. The stand-up board may have three current paths, each connecting to its corresponding set of pins.
[0056] Because the vertical plate protrudes two pins 220 of one set of pins in the thickness direction of the main power board 100, the closed loop 230 formed by the three-phase winding delta connection has an angle with the surface of the main power board. The interference magnetic field generated by the circulating current in the closed loop 230 also has an angle with the surface of the main power board 100 (the interference magnetic field is not perpendicular to the surface of the main power board). The eddy currents generated by the interference magnetic field on the main power board 100 will be reduced, thereby reducing the damage of eddy currents to the circuits and components on the main power board 100. If the vertical plate includes two or more current-carrying lines, the area of the closed loop 230 formed by the three-phase windings can be reduced, thereby reducing the magnetic flux of the leakage magnetic field passing through the closed loop, reducing the circulating current generated by the closed loop 230, reducing the interference magnetic field generated by the circulating current, and further reducing the eddy currents generated by the interference magnetic field on the main power board 100.
[0057] Please see Figure 5 and Figure 6 In the power converter provided in this application, the three-phase winding 210 of the three-phase transformer 200 can also be the primary winding. The primary winding of the three-phase winding 210 of the three-phase transformer 200 is connected in a delta configuration, which is suitable for DC-DC boosting scenarios. While keeping the output power constant, the three-phase primary windings will all carry a large current when boosted by the three-phase transformer 200.
[0058] In this embodiment, the three-phase primary windings of the three-phase transformer 200 are delta-connected. The three-phase transformer 200 is disposed on one surface of the main power board 100. The three-phase transformer 200 includes three-phase windings 210. Each phase winding 210 includes two pins 220. The two pins 220 of one phase winding 210 are respectively connected to one pin 220 of each of the other two phase windings, so that the three-phase windings 210 form a delta connection. Among the multiple sets of interconnected pins, the electrical connector 300 is connected between the two pins 220 of one set of pins. The two pins 220 of one set of pins are disposed on the surface of the main power board 100. The electrical connector protrudes from the two pins 220 of one set of pins along the thickness direction of the main power board 100.
[0059] The electrical connector 300 is connected between two pins 220 of one set of pins. The two pins connected to the electrical connector 300 are located on the surface of the main power board. The electrical connector protrudes from the two pins of one set of pins along the thickness direction of the main power board, so that the three-phase primary windings are connected in an angle to form a closed loop 230 and the surface of the main power board, thereby reducing the circulating current of the closed loop 230 and greatly improving the conversion efficiency of the three-phase LLC resonant converter.
[0060] Please see Figure 7 Electrical connector 300 is also disposed on the first surface 110. Electrical connector 300 protrudes from two pins of one set of pins of the three-phase winding 210. The equivalent position of electrical connector 300 for conducting electricity is higher than the first surface 110 and also higher than two pins of one set of pins of the three-phase winding 210. Therefore, the closed loop 230 formed by the angled connection of the three-phase winding 210 will form an angle with the first surface 110 (not parallel to the first surface 110). The leakage magnetic field mainly generated by the three-phase transformer 200 will form an angle (less than 90°) with the closed loop 230. Since the leakage magnetic field mainly generated by the three-phase transformer 200 is not perpendicular to the closed loop 230, compared with the leakage magnetic field mainly generated by the three-phase transformer 200 being perpendicular to the closed loop 230, the leakage magnetic field will reduce the circulating current generated by the closed loop 230, which can reduce the loss of the power converter 10 caused by the circulating current and reduce the heat load of the three-phase winding 210 in the three-phase transformer 200.
[0061] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.
[0062] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.
[0063] In this application, expressions including ordinal numbers such as "first" and "second" may modify the elements. However, such elements are not limited by the foregoing expressions. For example, the foregoing expressions do not limit the order and / or importance of the elements. The foregoing expressions are only used to distinguish one element from other elements. For example, "first user equipment" and "second user equipment" refer to different user equipment, although both "first user equipment" and "second user equipment" are user equipment. Similarly, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.
[0064] When a component is referred to as "connected" or "accessed" to other components, it should be understood that this component not only connects directly to or accesses other components, but also that another component may exist between this component and other components. On the other hand, when a component is referred to as "directly connected" or "directly accessed" to other components, it should be understood that no component exists between them.
[0065] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A power converter, characterized in that, The system includes a main power board, a three-phase transformer, and electrical connectors. The three-phase transformer is disposed on one surface of the main power board and includes three-phase windings. Each phase winding includes two pins. The two pins of one phase winding are respectively connected to one pin of each of the other two phase windings to form a delta connection between the three phase windings. Among the multiple interconnected sets of pins, the electrical connector is connected between two pins of one set of pins. The two pins of one set of pins are disposed on the surface of the main power board, and the electrical connector protrudes from the two pins of one set of pins along the thickness direction of the main power board.
2. The power converter as described in claim 1, characterized in that, The distance between two pins in one group of pins is greater than the distance between two pins in any other group of pins.
3. The power converter as described in claim 1, characterized in that, The two pins of each group of windings are arranged at intervals and the pins of the three-phase windings are arranged sequentially, wherein one group of pins includes two pins located at both ends.
4. The power converter according to any one of claims 1-3, characterized in that, The electrical connector protrudes from the main power board and includes a first connection end and a second connection end. The first connection end and the second connection end are connected to the main power board, and the two pins of one group are respectively connected to the first connection end and the second connection end through the main power board.
5. The power converter according to any one of claims 1-4, characterized in that, The multiple sets of pins are disposed on one side of the three-phase transformer, and the electrical connectors are disposed parallel to the same side of the three-phase transformer.
6. The power converter as described in claim 1 or 2, characterized in that, The three-phase transformer includes a housing, which is higher than the pins of the three-phase winding along the thickness direction of the main power board. The electrical connector is located inside the housing of the three-phase transformer, and the portions of two pins of one set of pins located inside the housing are connected by the electrical connector.
7. The power converter according to any one of claims 1-6, characterized in that, The electrical connector includes one of a vertical plate, a copper busbar, or an aluminum busbar.
8. The power converter as described in claim 7, characterized in that, The electrical connector includes a vertical plate, the vertical plate includes at least one current path, and at least one set of pins in the plurality of sets of pins is connected to the at least one current path in a one-to-one correspondence.
9. A power supply device, characterized in that, The power supply device includes a plurality of power converters as described in any one of claims 1-8, wherein the plurality of power converters are connected in parallel or in series.