Bidirectional DC-DC converter

Abstract

The invention discloses a bidirectional DC-DC converter. The bidirectional DC-DC converter comprises a three-phase bridge type switch circuit, a resonant cavity, three transformers and a three-phase bridge type rectification circuit, wherein the resonant cavity comprises three resonant circuits; each resonant circuit comprises a capacitor and two inductors, and one end of one inductor is connected with one end of the capacitor and one end of the other inductor; the other end of any inductor of each of the three resonance circuits is correspondingly connected with the midpoint of a corresponding bridge arm in the three bridge arms of the three-phase bridge type switch circuit, and the other ends of the other inductors of the three resonance circuits are correspondingly connected with dotted terminals of three transformer primary windings; the dotted terminals of three transformer secondary windings are respectively and correspondingly connected with midpoints of three bridge arms of the three-phase bridge rectification circuit; synonym terminals of the three transformer secondary windings are mutually connected to form Y-shaped connection; and synonym terminals of the primary windings are mutually connected to form Y-shaped connection, and are connected with the other ends of the capacitors in the three resonance circuits.

Description

technical field [0001] The present invention relates to the technical field of power conversion, and more particularly relates to a bidirectional DC-DC converter. Background technique [0002] The bidirectional DC-DC converter is a DC / DC converter that can adjust the bidirectional transmission of energy according to the needs. It is mainly used in energy storage systems, vehicle power systems, feedback charging and discharging systems, hybrid energy electric vehicles and other occasions. [0003] However, the bidirectional converters in the prior art generally adopt DAB or LLC topology. Although the DAB topology can realize a wide range of bidirectional, it is difficult to realize soft switching and the efficiency is low; although LLC can realize soft switching of the forward and reverse circuits, the rectification The gain curve of the inverter is inconsistent with the gain curve during inversion, and its reverse voltage gain is limited to 1, and the output voltage range is...

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Problems solved by technology

[0003] However, the bidirectional converters in the prior art generally adopt DAB or LLC topology. Although the DAB topology can realize a wide range of bidirectional, it is difficult to realize soft switching and the efficiency is low; although LLC can realize soft switching of the forward and reverse circuits, the rectification The gain curve of the inverter is inconsistent with the gain curve of the inverter, and its reverse voltage gain is limited to 1, and the output voltage range is narrow. To achieve a wide range of bidirectional, it is necessary to add a circuit to increase the voltage gain during reverse operation.

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