Parallel-connected resonant converter circuit and controlling method thereof

摘要

The configurations of a parallel-connected resonant converter circuit and a controlling method thereof are provided in the present invention. The proposed circuit includes a plurality of resonant converters, each of which has two input terminals and two output terminals, wherein all the two input terminals of the plurality of resonant converters are electrically series-connected, and all the two output terminals of the plurality of resonant converters are electrically parallel-connected.

主权项

1. A parallel-connected resonant converter circuit comprising:
a plurality of resonant converters, each of which has two input terminals and two output terminals, a DC power source having a positive and a negative terminals, an output capacitor, and a plurality of input capacitors, each of the plurality of input capacitors has a first and a second terminals and is electrically parallel-connected to the two input terminals of a corresponding one of the plurality of resonant converters, wherein the output capacitor is electrically parallel-connected to the two output terminals of each the resonant converter, and the series-connected resonant converters are connected in paralleled with the DC power source at the positive and the negative terminals, wherein all the two input terminals of the plurality of resonant converters are electrically series-connected, and all the two output terminals of the plurality of resonant converters are electrically parallel-connected, wherein the output capacitor is electrically connected at one end with one of the two output terminals of one of the plurality of the resonant converters, and electrically connected at the other end with one of the two output terminals of another one of the plurality of the resonant converters, and wherein the resonant converter circuit is controlled by a method comprising steps of:
causing, when an input voltage across the two input terminals of a specific one of the plurality of resonant converters decreases, an input voltage across the two input terminals of at least one of the remaining ones of the plurality of resonant converters to rise;causing an output current flowing through the two output terminals of the at least one of the remaining resonant converters to rise when the input voltage across the two input terminals of the at least one of the remaining resonant converters rises; andreaching a balance between the specific resonant converter and the at least one of the remaining resonant converters when a ratio between an output current flowing through the two output terminals of the specific resonant converter and the output current flowing through the at least one of the remaining resonant converters equals to a ratio between a reciprocal of a DC voltage gain of the specific resonant converter and a reciprocal of a DC voltage gain of the at least one of the remaining resonant converters.