High-current and high-power power converter

Abstract

The invention relates to a high-current and high-power power converter, which comprises at least two parallel three-phase converters, a rectifying circuit and a filtering circuit, wherein an input endof each of the three-phase converters is connected with a power supply circuit, and an output end is connected to the filtering circuit by means of the rectifying circuit; each three-phase convertercomprises a switching network, a capacitor-inductor combination module and a transformer combination module which are sequentially connected in series; each transformer combination module comprises three phases of transformer combinations, each phase of transformer combination comprises at least two transformers, primary windings of the two transformers are connected in series or in parallel, andthe secondary windings are connected in series; and the primary windings and the secondary windings of each phase of transformer combination are respectively connected with one another to form a starconnection or a delta connection. By implementing he high-current and high-power power converter, special current sharing control is not required, the control is simple and reliable, switching tubes do not need to be used in parallel directly, the current sharing problem of parallel connection of the switching tubes is solved, the severe power imbalance caused by the difference of device parameters is solved, and the high-current and high-power requirements are satisfied.

Description

technical field [0001] The invention relates to the field of power supplies, more specifically, to a high-current and high-power power converter. Background technique [0002] Common DCDC conversion topologies in power modules include half-bridge, full-bridge and other structures. As the output power of the module increases, the output ripple current also increases. It is necessary to increase the size and cost of the output filter, which is difficult to meet the high demands of power supply products. power density, low cost targets. In order to reduce the size of the output ripple current and reduce the size of the output filter, an interleaved parallel technology is usually used. In the interleaved parallel technology, the problem of current sharing needs to be considered. In order to realize parallel current sharing, it is usually necessary to add corresponding current sharing devices, which also increases the complexity of control. [0003] With the further improvement...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that, aiming at the above-mentioned defects of the prior art, it provides a method that does not require switching tubes to be used directly in parallel, so no special current sharing control is required, and it can solve the problem of severe power imbalance caused by device parameter differences, satisfying High-current and high-power power converters with high current and high power requirements

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