Isolation type active clamping alternation parallel DC/DC convertor

Abstract

An isolated type active clamping interlaced parallel connection AC-AC converter disclosed by the invention comprises two power switch tubes, two output diodes, two clamping diodes, one auxiliary power switch tube, one clamping capacitance, two switch capacitances, one output capacitance and two flyback transformers. The two flyback transformers respectively have two windings. The invention uses a second winding of two flyback transformers and two switch capacitances to realize improvement of the transformer output power grade. The leakage inductance energy of two flyback transformers are absorbed only using one auxiliary switch tube and one clamping capacitance, the zero voltage switch on and off of two power switch tubes and two auxiliary switch tubes are realized using the arrangement of shunt capacitances existing by the two power switch tubes selves and gates of two power switch tubes and two auxiliary switch tubes, soft switch off of the two output diodes and the two clamping diodes are realized by leakage inductances of the two flyback transformers, energy consumption elements are not existed in the circuit, thereby improving the output gain of the converter and the circuit efficiency.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to an isolated active clamp interleaved parallel DC / DC converter. Background technique [0002] A conventional flyback (Flyback) interleaved parallel DC-DC converter includes two flyback transformers, two output diodes, two power switch tubes, one end of the first winding of the first flyback transformer and the second flyback One end of the first winding of the transformer is commonly connected to the positive end of the input power supply, the other end of the first winding of the first flyback transformer is connected to the drain of the first power switch tube, and the other end of the first winding of the second flyback transformer One end is connected with the drain of the second power switch tube. One end of the second winding of the first flyback transformer and one end of the second winding of the second flyback transformer are jointly connected to the negative end of the output capaci...

AI Technical Summary

Problems solved by technology

Although these two methods can realize the soft switching of the power switch tube, the external circuit is complicated, and the voltage stress of the power switch tube cannot be reduced, and the output power level of the converter cannot be improved.

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