Transformer unit and power switching circuit

Abstract

The invention provides a transformer unit and a power switching circuit. The transformer unit comprises: a first secondary wiring layer which comprises a first secondary winding; a second secondary wiring layer which comprises a second secondary winding and is adjacent to the first secondary wiring layer, wherein the first end of the second secondary winding is connected with the first end of the first secondary winding through at least a first through hole; a plurality of primary wiring layers which comprise primary windings, wherein the first secondary wiring layer and the second secondary wiring layer are located between the plurality of primary wiring layers. And at least the first through hole is located in the projection of at least one primary winding of the plurality of primary wiring layers. The transformer unit and the power switching circuit have the advantages that leakage inductance and winding loss of the transformer can be effectively reduced.

Description

technical field [0001] The present disclosure relates to the technical field of power supplies, in particular to a transformer unit and a power conversion circuit using the transformer unit. Background technique [0002] The development of data centers will make it possible to convert the input of POL (point-of-load) power from 12V to 48V or even 400V, and the output voltage of POL is often relatively low. Therefore, a high-frequency conversion circuit capable of achieving a high input-to-output voltage ratio is required , such circuits often contain a transformer. However, it is not easy to achieve high efficiency at high frequency and high current on the output side. In related technologies, for example, the LLC (resonant converter) topology is widely used due to advantages such as low switching loss, high efficiency, and easy expansion of output power. For low-voltage high-current output applications, such as figure 1 As shown, multiple transformers are usually connect...

AI Technical Summary

Problems solved by technology

But in this S / P / S structure transformer, since the vias between the secondary windings W1 and W2 will pass through the primary winding, the number of vias should not be too large, otherwise the primary winding will be cut off, making the primary winding Increased resistance loss; due to the limited number of vias, further optimization of winding losses is limited

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