Intersected rectification input-parallel and output-parallel combined converter

Abstract

The invention discloses an intersected rectification input-parallel and output-parallel combined converter. A main circuit of the combined converter comprises two isolation bridge-type module circuits of which the rectification outputs are connected together in an intersection manner; each bridge-type module circuit consists of a half bridge circuit or a full bridge circuit with a blocking capacitor, a high-frequency transformer, a rectification circuit and an output filter inductor; the half bridge or full bridge circuit is connected with the original edge of the transformer; the rectification circuit is connected with the auxiliary edge of the transformer; and the rectification outputs are connected with the two output filter inductors in the intersection manner. The input ends of the bridge-type circuits are connected in parallel with each other, and the output ends of the output filter circuits are connected in parallel with each other. By the intersection rectification circuit, the inconsistent rectification output voltages caused by inconsistent circuit parameters can be counteracted, so that natural current sharing of the two output filter inductors can be realized, and input natural current sharing of the two bridge-type circuits can be realized simultaneously; a current-sharing control ring is not needed to be arranged, and the current of the bridge-type circuits is not needed to be sampled, so the control step is simplified greatly, the power density and the reliability of the combined converter are improved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to an input-parallel-output-parallel combination converter for cross rectification. Background technique [0002] As the power level increases, the volume of the magnetic components of the converter will also increase, and the magnetic loss and the current stress of the switch tube will also increase accordingly, which limits the efficiency and power density of the converter. Connecting two or more converters in parallel at the input and output ends can reduce the power level of a single converter, thereby ensuring that a single converter can work at a higher switching frequency, which is conducive to improving power density. In addition, each converter is usually interleaved in parallel to reduce the input and output current ripple, thereby reducing the size of the input and output filter capacitors. In view of the above advantages, the input-parallel-output parallel com...

AI Technical Summary

Problems solved by technology

The active current sharing method has a wide range of applications and good output characteristics, but requires current sampling for each converter unit, the control system design is more complicated, and the current sharing bus is easily disturbed

If digital control is adopted, an analog-to-digital converter (ADC) needs to be added for each additional current sampling point, and the current sharing loop design of n converter units is more complicated

In short, adding a current sharing ring reduces the reliability of the combined converter, increases the design cost and increases the complexity of the control

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