An isolated double half-bridge anpc active bridge three-level dc/dc converter

Abstract

The invention discloses an isolated double half-bridge ANPC active bridge three-level DC / DC converter, two half-bridge ANPC active bridges, an inductor and a transformer, and the two half-bridge ANPC active bridges are respectively connected to two sides of the transformer. side; each half-bridge ANPC active bridge cyclically outputs positive level, zero level, negative level and zero level; when energy flows from the primary side of the DC / DC converter transformer to the secondary side, the DC / DC converter input The half-bridge ANPC active bridge circuit on the side is in the inverter state, and the half-bridge ANPC active bridge circuit on the output side is in the rectification state; when the energy flows from the secondary side of the DC / DC converter transformer to the primary side, the DC / DC conversion The half-bridge ANPC active bridge circuit on the input side of the converter is in the rectification state, and the half-bridge ANPC active bridge circuit on the output side is in the inverter state; the voltage stress that each switching tube in each half-bridge ANPC active bridge bears is half of the bus voltage. The invention realizes the low withstand voltage level, low cost and low switching loss of the switch device through the ANPC three-level circuit.

Description

technical field [0001] The present invention relates to the technical field of DC / DC converters, in particular to an isolated double half-bridge active neutral point clamped (Active Neutral Point Clamped, ANPC) active bridge three-level DC / DC converter. Background technique [0002] A DC / DC converter with galvanic isolation and bidirectional power transmission capability can realize power transmission and voltage transformation between grids of different voltage levels. Dual Active Bridge (DAB) DC / DC converter has the advantages of electrical isolation, high power density, energy can flow in both directions and soft switching is easy to implement, and has been obtained in the fields of renewable energy and DC power transmission and distribution. extensive research and applications. [0003] A common DAB topology is a dual H-bridge DAB, where the voltage stress on the switching devices is the DC bus voltage. Since the withstand voltage level of the full-control power device...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the defects of the prior art, the object of the present invention is to solve the problem of the high withstand voltage level of the device in the dual active bridge isolated bidirectional DC / DC converter based on the double H bridge, the limited DC bus voltage of the converter, and the problem of the three-level circuit. Technical Problems of Unbalanced Distribution of Power Device Loss

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