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, which comprises two half-bridge ANPC active bridges, an inductor and a transformer. The two half-bridge ANPC active bridges are connected to the two sides of the transformer respectively. Each half-bridge ANPC active bridge circularly outputs a positive level, a zero level, a negative level and azero level. When energy flows from the primary side to the secondary side of the DC / DC converter transformer, the half-bridge ANPC active bridge circuit on the input side of the DC / DC converter is inan inversion state, and the half-bridge ANPC active bridge circuit on the output side of the DC / DC converter is in a rectification state. When energy flows from the secondary side to the primary sideof the DC / DC converter transformer, the half-bridge ANPC active bridge circuit on the input side of the DC / DC converter is in a rectification state, and the half-bridge ANPC active bridge circuit onthe output side of the DC / DC converter is in an inversion state. The voltage stress borne by each switching tube in each half-bridge ANPC active bridge is half of the bus voltage. Low voltage withstanding level, low cost and low switching loss of a switching device are realized through an 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

Images