High-power high-voltage high-frequency transformer

Abstract

The invention provides a high-power high-voltage high-frequency transformer. The transformer comprises an insulating partition plate; a primary winding and a secondary winding which are respectively arranged on two sides of the insulating partition plate, wherein the primary winding and the secondary winding are spirally coiled according to a plane to form a wire cake, and an inner hole is formedin the center of the wire cake; and primary and secondary side magnetic cores which are arranged in inner holes of the primary and secondary side windings; the primary side magnetic core is fixed in the primary side shielding case, the secondary side magnetic core is fixed in the secondary side shielding case, and the primary side shielding case and the secondary side shielding case enable the whole high-power high-voltage high-frequency transformer to be flat. Therefore, the transformer is in an ultra-thin flat shape, thermal resistance can be reduced, voltage resistance and creepage distanceare guaranteed, insulating materials are saved, due to the flat shape, the distance between the shielding covers on the two sides is small, the plane is large, the uniformity of an internal electricfield is good, no partial discharge can be achieved, and the insulating plate is arranged between the primary winding and the secondary winding. The primary side and the secondary side of the transformer can be completely isolated, and high-voltage isolation is achieved.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a high-power high-voltage high-frequency transformer. Background technique [0002] With the advancement of new energy technology, various power electronic energy conversion devices are emerging. In power electronic energy conversion devices, high-voltage and high-frequency transformers are indispensable and important components. [0003] However, in the related art, the high-power high-voltage high-frequency transformer has the following technical problems: [0004] 1. The size is large, and the core coil structure of the traditional transformer is followed, resulting in the three dimensions of length, width and height being roughly the same order of magnitude. [0005] 2. When the length, width, and height of a high-power high-voltage, high-frequency transformer are all large, the thermal resistance of the heat conduction path inside the transformer is large, resulting i...

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Problems solved by technology

[0004] 1. The size is large, and the core coil structure of the traditional transformer is followed, resulting in the three dimensions of length, width and height being roughly the same order of magnitude

[0005] 2. When the length, width and height of the high-power high-voltage high-frequency transformer are all large, the thermal resistance of the heat conduction path inside the transformer is relatively large, resulting in an excessively high internal temperature rise.

In order to obtain a reasonable temperature rise, either increase the material consumption of the magnetic core and coil in exchange for lower loss, resulting in an increase in cost; or add an additional cooling device, which increases the complexity of the system and reduces the reliability of operation. will inevitably increase the cost

[0006] 3. When applied to 10KV-35KV isolation voltage, the insulation thickness and creepage distance are the main factors determining the size of the transformer. Increase the insulation and creepage distance, resulting in a significant increase in the volume of high-voltage high-frequency transformers in high-voltage applications

At the same time, determined by the coil structure of the traditional transformer magnetic circuit, the shape of the internal high and low voltage parts is more complicated, the voltage is higher, and it is easy to form a strong local electric field and cause discharge

Therefore, it is extremely difficult to control the withstand voltage and partial discharge capacity of the high-voltage high-frequency transformer in the related art, especially the partial discharge index is a key factor affecting the power density of the high-voltage isolation high-frequency transformer

In order to solve these problems, the insulation thickness and creepage distance are usually additionally increased, resulting in large transformer volume, high material consumption, increased loss, and unfavorable heat dissipation, resulting in excessive temperature rise;

[0007] 4. The primary and secondary windings and the magnetic core are wrapped together, and the isolation level is not high

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