Multi-phase interleaved parallel DC converter

Abstract

The invention discloses a multi-phase interleaved parallel DC converter. The multi-phase interleaved parallel DC converter comprises: a coupling inductor, a bridge-type circuit and an output filter capacitor, wherein the coupling inductor is provided with an input end and k output ends, and the input end of the coupling inductor is used for being connected with a positive electrode of a power supply; the bridge-type circuit comprises: k phases of bridge arms; a midpoint of each phase of bridge arm serves as an input end of the bridge-type circuit; k input ends of the bridge-type circuit are connected with the k output ends of the coupling inductor respectively; the first output end of the bridge-type circuit is connected with a first input end of the output filter capacitor, and the second output end of the bridge-type circuit is connected with a second input end of the output filter capacitor. According to the multi-phase interleaved parallel DC converter, an interleaved parallel manner is adopted, the current phase mutual difference between all phases of bridge arms is 360 DEG / k, and the equivalent switching frequency of the total current of the overlapped phases of bridge arms is improved to be k times the original equivalent switching frequency; under the condition of filtering the same current ripple, the needed inductance value is smaller as the current frequency is higher, so the ring current can be inhibited in the interleaved parallel manner, and the needed inductance value can be decreased.

Description

technical field [0001] The invention belongs to the technical field of DC converters, and more particularly relates to a multi-phase interleaved parallel DC converter. Background technique [0002] The bidirectional DC converter can realize the bidirectional flow of energy, can realize the function of the traditional two unidirectional converters, and achieve the purpose of "one machine with two uses". Systems and other occasions are getting more and more applications. [0003] Existing non-isolated bidirectional DC converters usually adopt a buck / boost structure, which has a simple topology and a mature control scheme, but in order to reduce the current ripple, it is usually necessary to add a large filter inductor on the low-voltage side. To solve this problem, the interleaved parallel connection technology is generally used, but the traditional interleaved parallel connection requires multiple filter inductors, and at the same time, there is a large circulating current b...

AI Technical Summary

Problems solved by technology

To solve this problem, interleaved parallel technology is generally used, but the traditional interleaved parallel connection requires multiple filter inductors, and at the same time, there is a large circulating current between the two interleaved phases due to the short-circuit mode of the circuit introduced by the phase shift of the drive signal

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