Seclusion type interleaving parallel connection DC/DC converter with switch capacitance

Abstract

The present invention discloses an isolated type interleaving DC / DC converter with a switching capacitor, comprising two power switching tubes, two output diodes, two clamping diodes, two auxiliary power switching tubes, two clamping capacitors, two switching capacitors, one output capacitor and two flyback transformers. The converter uses the second windings and two switching capacitors of two flyback transformers to realize the improvement of the output power level of the converter. Two auxiliary switching tubes and two clamping capacitors are respectively used for absorbing the leakage inductance energy of the two flyback converters. The parallel capacitors existed in the two power switching tubes and the gate pole arrangement of the two power switching tubes and the two auxiliary switching tubes are used for realizing the zero voltage cutover and the zero voltage shutoff of the two power switching tubes and the two auxiliary switching tubes. The leakage inductance of the two flyback converters is used for realizing the soft shutoff of the two output diodes and the two clamping diodes. The circuit has no dissipative elements, and the power class and the circuit efficiency of the converter can be improved.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to an isolated interleaved parallel DC / DC converter with switched capacitors. 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 o...

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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