Transformer assembly, charging and discharging module and power electronic converter

Abstract

The transformer assembly comprises a transformer, a blocking capacitor plate and a printed board platform, the blocking capacitor plate comprises a plurality of printed boards, a first end face and a second end face which are oppositely arranged are formed on each printed board, the number of first capacitors is equal to the number of second capacitors, and the printed board platform is arranged on the first end face and the second end face. The arrangement position of the first capacitor on the first end face corresponds to the arrangement position of the second capacitor on the second end face. According to the technical scheme, the capacitors are placed on the front face and the back face of the blocking capacitor plate, the number of the capacitors is equal, the capacitors are symmetrical in position, magnetic fields generated by alternating currents flowing in and out of the capacitors can be counteracted through the arrangement, the eddy current influence caused to the outside is minimum, and the system stability is correspondingly improved.

Description

A transformer assembly, a charge / discharge module, and a power electronic converter. Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a transformer assembly, a charging and discharging module, and a power electronic converter. Background Technology

[0002] In power electronic converter systems, the transformer, as a core component, plays a crucial role in energy transmission and electrical isolation. To prevent magnetic saturation during transformer operation, DC blocking capacitors are often connected in series with the transformer to isolate the DC component in the circuit. In high-voltage, low-current operating scenarios, the placement of the transformer and DC blocking capacitors is flexible due to the relatively small number of components, resulting in a compact system layout. However, in low-voltage, high-current applications, the number of components increases significantly, making the optimal placement of the transformer and DC blocking capacitors difficult, thus affecting system efficiency and fabrication / assembly feasibility.

[0003] Commonly used strategies in related technologies include employing a current-mode topology or operating a voltage-mode topology in discontinuous mode to release the magnetizing current and prevent transformer saturation. However, the former introduces significant voltage stress, while the latter is only applicable to specific operating conditions and increases the effective current value, reduces energy transfer efficiency, and limits the transformer's transmission capacity.

[0004] In addition, existing converter designs have the following problems: the DC blocking capacitors are far from the transformer, and the connection lines are long, resulting in significant energy loss; the connection path lengths of multiple DC blocking capacitors and the transformer are inconsistent, making it difficult to achieve current sharing and susceptible to the "weakest link" effect, which limits the overall lifespan of the system; the irregular arrangement of DC blocking capacitors can easily cause the AC current to generate non-uniform magnetic fields around the conductor. These magnetic fields may induce eddy currents in the surrounding metal structures or conductors, resulting in local heating, electromagnetic interference, and a decrease in system stability.

[0005] Therefore, the relevant technologies need to be improved. Summary of the Invention

[0006] The main objective of this invention is to provide a transformer assembly, a charging and discharging module, and a power electronic converter, so as to at least solve the technical problem of low system stability caused by the easy induction of eddy currents in transformer assemblies in related technologies.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] In a first aspect, this utility model provides a transformer assembly, which includes a transformer, a DC blocking capacitor board, and a printed circuit board platform.

[0009] An electrical connection area is formed on the printed circuit board platform, and the transformer and the DC blocking capacitor plate are electrically connected through the electrical connection area;

[0010] The DC blocking capacitor board includes multiple printed circuit boards, each of which forms a first end face and a second end face that are disposed opposite to each other. The first end face is provided with multiple first capacitors, and the second end face is provided with multiple second capacitors.

[0011] The number of the first capacitors is equal to the number of the second capacitors, and the position of the first capacitor on the first end face corresponds to the position of the second capacitor on the second end face.

[0012] A second aspect of this utility model provides a charging and discharging module, including a power supply and a transformer assembly as described in the first aspect, wherein the power supply is used to supply power to the transformer assembly.

[0013] A third aspect of this utility model provides a power electronic converter, including a converter body and a charging / discharging module as described in the second aspect.

[0014] This utility model discloses a transformer assembly, a charging / discharging module, and a power electronic converter. The assembly includes a transformer, a DC blocking capacitor board, and a printed circuit board platform. The DC blocking capacitor board comprises multiple printed circuit boards, each with a first end face and a second end face arranged opposite to each other. The number of first capacitors is equal to the number of second capacitors, and the positions of the first capacitors on the first end face correspond to the positions of the second capacitors on the second end face. In other words, the DC blocking capacitor board in this technical solution places capacitors on both sides, with an equal number and symmetrical positions. This arrangement allows the magnetic fields generated by the AC current flowing into and out of the capacitors to cancel each other out, minimizing the impact of eddy currents and thus improving system stability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a front view of the transformer assembly provided in an embodiment of this application;

[0017] Figure 2 is a three-dimensional schematic diagram of the transformer assembly provided in an embodiment of this application;

[0018] Figure 3 is a side view of the DC blocking capacitor plate in an embodiment of this application;

[0019] Figure 4 is a front view of the DC blocking capacitor plate in the embodiment of this application;

[0020] Figure 5 is a schematic diagram showing the current path in the DC blocking capacitor plate in an embodiment of this application;

[0021] Figure 6 is an equivalent circuit diagram of the transformer and DC blocking capacitor plate in the transformer assembly provided in the embodiment of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that related terms such as "first" and "second" can be used to describe various components, but these terms do not limit the component. These terms are only used to distinguish one component from another. For example, without departing from the scope of this utility model, the first component can be referred to as the second component, and the second component can similarly be referred to as the first component. The term "and / or" refers to any one or more combinations of related and descriptive terms.

[0024] Please refer to Figures 1, 2 and 3. This embodiment provides a transformer assembly, which includes a transformer 10, a DC blocking capacitor board 20 and a printed circuit board platform 30.

[0025] The printed circuit board platform 30 supports the entire electrical structure and has an electrical connection area 301 on it for realizing the electrical connection between the transformer 10 and the DC blocking capacitor board 20. Specifically, the output terminal of the transformer 10 is connected to the input terminal of the DC blocking capacitor board 20 through the electrical connection area, so that the AC signal output by the transformer 10 enters the subsequent circuit after being filtered by the capacitor of the DC blocking capacitor board 20.

[0026] The DC blocking capacitor board 20 includes multiple printed circuit boards 201. Each printed circuit board 201 has a first end face and a second end face (e.g., front and back sides). A first capacitor 202 is provided on the first end face, and a second capacitor 203 is provided on the second end face.

[0027] In this circuit, the number of first capacitors 202 is equal to the number of second capacitors 203. Furthermore, on the printed circuit board 201, the position of each first capacitor 202 on the first end face corresponds point-to-point with the position of each first capacitor 203 on the second end face. For example, if there are three first capacitors 202 on the first end face of the printed circuit board 201 (corresponding to three positions, assuming A1, B1, and C1), and correspondingly three second capacitors 203 on the second end face (corresponding to three positions, assuming A2, B2, and C2), then positions A1 and A2 correspond one-to-one, B1 and B2 correspond one-to-one, and C1 and C2 correspond one-to-one. Alternatively, it can be interpreted as "positions A1, B1, and C1 are positioned relative to positions A2, B2, and C2 in the projection direction, forming a vertical correspondence."

[0028] Thus, in this embodiment of the application, by placing an equal number of capacitors in symmetrical positions on both sides of the DC blocking capacitor plate 20, the magnetic fields generated by the AC current flowing into and out of the capacitors can cancel each other out, thereby minimizing the impact of eddy currents on the external system and improving system stability accordingly.

[0029] To further illustrate the technical effects (magnetic field cancellation, etc.) of the embodiments of this application, please refer to Figures 4 and 5. There are three paths for the current direction (110, 120, 130). According to the right-hand rule, the magnetic field generated on the front side is directed to the left, and the magnetic field generated on the other side is directed to the right; therefore, the magnetic fields cancel each other out. Furthermore, the arrangement of the capacitors ensures that the distance between the lead ends of each capacitor in the first and second capacitors and the pins of the printed circuit board is equal. For example, the currents in current paths 110, 120, and 130 flow through both sides and the middle of the capacitors, respectively, with essentially the same path length. This ensures that the impedance of the capacitors and the electrical connection points is the same, thereby achieving excellent current sharing and improving the overall lifespan of the capacitor board.

[0030] It should be noted that this combination achieves the shortest path connection between transformer 10 and DC blocking capacitor plate 20, reducing line impedance and thus improving converter efficiency. At the same time, this combination considers manufacturing feasibility, facilitates operation, and improves manufacturing efficiency.

[0031] Please return and continue to refer to Figure 4. A first pin 2012 (long pin) and a second pin 2011 (short pin) are formed on each printed circuit board 201. The length of the first pin 2012 is greater than the length of the second pin 2011.

[0032] In practical applications, current can flow in any of the following directions:

[0033] One mode is as follows: the current is input from the first pin 2012 (long pin), flows through the first capacitor 202 located on the first end face and the second capacitor 203 located on the second end face in sequence, and finally converges on the printed circuit board 201 and is output through the second pin 2011 (short pin).

[0034] Another mode is: the current is input from the second pin 2011 (short pin), flows through the second capacitor 203 and the first capacitor 202 in sequence, and finally converges on the printed circuit board 201 and is output from the first pin 2012 (long pin).

[0035] In this embodiment, regardless of the orientation, the structure of the first pin 2012 and the second pin 2011, as well as their wiring with the capacitors, ensure that: the current paths are basically consistent in physical length; the left and right (or up and down) capacitors are arranged symmetrically, and the magnetic field distribution tends to be balanced; the current distribution carried by each group of capacitors is balanced, avoiding local overload; the current flows in opposite directions between adjacent capacitors, which can generate local magnetic fields in opposite directions, thereby canceling each other out and reducing electromagnetic interference.

[0036] In an optional embodiment of this example, the printed circuit board platform 30 forms a first platform end face and a second platform end face (e.g., a top end face and a bottom end face) that are disposed opposite to each other.

[0037] Specifically, the transformer 10 and the DC blocking capacitor plate 20 are both installed on the end face 301 of the first platform, and they are spaced apart along the horizontal or vertical direction on the end face of the first platform. This arrangement helps to increase the heat dissipation space, reduce thermal coupling between devices, and also facilitates the distribution of the center of gravity and structural balance of the components.

[0038] Furthermore, the electrical connection area on the printed circuit board platform 30 is located on the second platform end face 302, that is, on the side opposite to the device mounting surface. By being located on the bottom surface, the electrical connection area performs the following functions: providing electrical interconnection between the transformer 10 and the DC blocking capacitor board 20.

[0039] In this embodiment, the electrical connection area 301 can form a reliable electrical connection with the transformer 10 and the DC blocking capacitor plate 20 on the first platform end face through through-hole connection, countersunk hole welding, plug-in terminals or through-hole wires, thereby realizing the modular layout of "upper-level functional components + lower-level electrical connection area" in terms of structure.

[0040] In an optional embodiment of this example, each printed circuit board 201 is arranged on the first platform end face 301 according to a uniform rule, and the installation interval between any two adjacent printed circuit boards 201 is equal.

[0041] Specifically, the equidistant arrangement helps to ensure the symmetrical layout of the capacitor components on each printed circuit board 201, maintains the balance of their respective current paths, and ensures that the lead length and impedance parameters connected to the electrical connection area are consistent, which helps to achieve current sharing among multiple capacitors.

[0042] Please refer to Figures 1 and 6. The second platform end face is provided with a first component pin 60 and a second component pin 50.

[0043] The first end of the secondary winding of transformer 10 is electrically connected to the first component pin 60 via the DC blocking capacitor plate 20, and the second end of the secondary winding of transformer 10 is electrically connected to the second component pin 50. Thus, the electrical connection between this transformer component and the external conversion module motherboard is realized through the first component pin 60 and the second component pin 50.

[0044] The AC signal output from the first end of the secondary winding of transformer 10 is first filtered and DC isolated by the DC blocking capacitor plate 20, and then enters the first component output pin 60, from which it is soldered to the external converter module motherboard. The second end of the secondary winding is directly connected to the second component output pin 50, and is also soldered to the external converter module motherboard. Through the above structure, this embodiment not only meets the requirements of electrical isolation and filtering, but also further optimizes the connection form between the component and the external system, improving modular integration efficiency and structural stability.

[0045] In an optional embodiment of this example, the transformer assembly further includes a pad 40 disposed on the end face of the second platform.

[0046] Specifically, the pad 40 is used to support the transformer 10 and the DC blocking capacitor plate 20. Its position corresponds roughly to the center of gravity of the components above, thus providing structural support and preventing the components from deforming or shifting under pressure. This pad can significantly improve the mechanical strength and structural stability of the components, and is particularly suitable for installing large-volume or heavy power devices.

[0047] Optionally, the pad 40 can be made of a high-temperature resistant rigid insulating material, such as polyimide-reinforced composite material, ceramic matrix material, or epoxy fiberglass board. By placing the pad 40 on the end face of the second platform, not only is physical support provided for the transformer assembly in the vertical direction, but it also effectively prevents interference or contact risks between the pins or solder joints in the electrical connection area and other components on the motherboard, thereby enhancing the electrical safety and assembly compatibility of the entire system.

[0048] In an optional embodiment of this invention, the electrical connection area is provided with at least one layer of copper foil. This copper foil is used to form the main current path between the transformer 10 and the DC blocking capacitor plate 20, achieving a highly conductive and low-impedance electrical interconnection.

[0049] In addition, the copper foil can be formed on the second platform end face 302 of the printed circuit board through lamination or electroplating processes, and is electrically connected to the pin terminals of the transformer 10 and the input terminal of the DC blocking capacitor plate 20. Depending on the actual current carrying capacity requirements, the electrical connection area can be provided with a multi-layer copper foil structure, wherein the multi-layer copper foil is electrically connected to each other through vias or blind vias to increase the current carrying cross-sectional area and reduce the unit path resistance.

[0050] This application also provides an electronic device, which includes a device body and a transformer assembly as described in the above embodiments.

[0051] This application also provides a control system, including a host computer and the electronic equipment described in the above embodiments.

[0052] This utility model discloses a transformer assembly, a charging / discharging module, and a power electronic converter. The assembly includes a transformer, a DC blocking capacitor board, and a printed circuit board platform. The DC blocking capacitor board comprises multiple printed circuit boards, each with a first end face and a second end face arranged opposite to each other. The number of first capacitors is equal to the number of second capacitors, and the positions of the first capacitors on the first end face correspond to the positions of the second capacitors on the second end face. In other words, the DC blocking capacitor board in this technical solution places capacitors on both sides, with an equal number and symmetrical positions. This arrangement allows the magnetic fields generated by the AC current flowing into and out of the capacitors to cancel each other out, minimizing the impact of eddy currents and thus improving system stability.

[0053] This utility model also has the following beneficial effects: 1. Extending the lifespan of the power module: By arranging the DC blocking capacitors in a current-sharing manner, some capacitors are prevented from being under high load for a long time, thus improving the lifespan of the components and the overall lifespan of the power module. 2. Improving module efficiency: By closely arranging the DC blocking capacitors and the transformer, line losses are reduced, and converter efficiency is improved. 3. Improving production efficiency: The overall installation of the transformer assembly reduces the final assembly time and improves production and assembly efficiency.

[0054] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A transformer assembly, characterized in that, The transformer assembly includes a transformer, a DC blocking capacitor board, and a printed circuit board platform. An electrical connection area is formed on the printed circuit board platform, and the transformer and the DC blocking capacitor board are electrically connected through the electrical connection area. The DC blocking capacitor board includes multiple printed circuit boards, each of which has a first end face and a second end face arranged opposite to each other. The first end face is provided with multiple first capacitors, and the second end face is provided with multiple second capacitors. The number of first capacitors is equal to the number of second capacitors, and the positions of the first capacitors on the first end face correspond to the positions of the second capacitors on the second end face.

2. The transformer assembly as described in claim 1, characterized in that, The lead ends of each of the first and second capacitors are equidistant from the pins of the printed circuit board.

3. The transformer assembly as described in claim 2, characterized in that, Each of the printed circuit boards forms a first pin and a second pin, wherein the length of the first pin is greater than that of the second pin; wherein current enters from the first pin and passes through the first capacitor and the second capacitor before converging to the printed circuit board and flowing out from the second pin, or current enters from the second pin and passes through the first capacitor and the second capacitor before converging to the printed circuit board and flowing out from the first pin.

4. The transformer assembly as described in claim 1, characterized in that, The printed circuit board platform forms a first platform end face and a second platform end face that are arranged opposite to each other; the transformer and the DC blocking capacitor plate are both disposed on the first platform end face and are distributed at intervals; the electrical connection area is disposed on the second platform end face.

5. The transformer assembly as described in claim 4, characterized in that, Each of the printed circuit boards is arranged linearly on the end face of the first platform, and the spacing between any two adjacent printed circuit boards is equal.

6. The transformer assembly as described in claim 4, characterized in that, The second platform end face is provided with a first component pin and a second component pin; the first end of the secondary winding of the transformer is electrically connected to the first component pin via the DC blocking capacitor plate, and the second end of the secondary winding of the transformer is electrically connected to the second component pin; the first component pin and the second component pin are used to be soldered to the external conversion module motherboard.

7. The transformer assembly as claimed in claim 4, characterized in that, The transformer assembly also includes a pad; the pad is disposed on the end face of the second platform and is used to support the transformer and the DC blocking capacitor plate.

8. The transformer assembly as claimed in claim 4, characterized in that, The electrical connection area is provided with at least one layer of copper foil.

9. A charging and discharging module, characterized in that, It includes a power supply and a transformer assembly as described in any one of claims 1 to 8, wherein the power supply is used to supply power to the transformer assembly.

10. A power electronic converter, characterized in that, It includes the converter body and the charging / discharging module as described in claim 9.

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