Bidirectional common-current DC/DC converter using coupling inductor and method

Abstract

The invention discloses a bidirectional common-current DC / DC converter using a coupling inductor and a method. The bidirectional common-current DC / DC converter comprises two secondary coupling inductor branches for realizing a higher voltage conversion factor, a current sharing characteristic and soft switching; due to the fact that a double-current-path inductance structure is adopted, the voltage conversion ratio is increased, and current can be shared in all working modes; soft switching of a synchronous rectification concept is utilized by all active switches, so that conduction loss can be reduced; and according to the converter, soft switching can be achieved without additional circuit elements, and operation with higher efficiency can be achieved. According to the converter, the input current is shared by two parallel inductor current paths in the step-up and step-down modes, so that the rated current of a single coil is reduced, input current ripples are reduced, leakage inductance energy is directly transmitted to a load due to topological advantages, and the maximum measurement efficiency of the step-down mode under the 170W condition and the maximum measurement efficiency of the step-up mode under the 190W condition are 96.12% and 96.63% respectively.

Description

technical field [0001] The invention belongs to the technical field of power electronic soft switching, and in particular relates to a bidirectional co-current DC / DC converter and method using coupled inductance. Background technique [0002] Bidirectional DC / DC converters are widely used in the fields of storage interfaces and electric vehicles. Because it requires a high voltage gain in boost mode, and the interface low-voltage battery can even reach the high-voltage side in buck mode, the traditional two-switch non-isolated bidirectional DC / DC is not suitable for these applications. The traditional bidirectional DC / DC The efficiency and voltage stress performance of the converter is also poor. In order to solve the problem that it is difficult to achieve the required conversion ratio in both buck and boost modes, bidirectional DC / DC converters are divided into two types: isolated bidirectional DC / DC converters and non-isolated bidirectional DC / DC converters. kind. In o...

AI Technical Summary

Problems solved by technology

However, switching losses and large switching current stress for this type of converter are still major issues

Soft switching in these converters, i.e. zero-voltage switching of active switches, can be achieved with auxiliary circuits, but with limited gain and control complexity

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