Isolation type active clamping alternation parallel DC/DC convertor

An isolated and converter technology, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc. It can solve the problem that the output power level of the converter cannot be improved, the external circuit is complicated, and the voltage stress of the power switch tube cannot be reduced. and other problems, to achieve the effect of simple structure, high output power level and small quantity

Inactive Publication Date: 2008-10-08
ZHEJIANG UNIV
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  • Abstract
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  • Claims
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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.

Method used

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  • Isolation type active clamping alternation parallel DC/DC convertor

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Embodiment Construction

[0008] see figure 1 , the isolated active clamp interleaved parallel DC / DC converter of the present invention includes two power switch tubes S1 and S2, two clamp diodes Dc1 and Dc2, two output diodes Do1 and Do2, and an auxiliary power switch tube Sc , a clamping capacitor Cc, two switched capacitors Cf1, Cf2, an output capacitor Co and two flyback transformers, the first flyback transformer has two windings L1a, L1b, the second flyback transformer has two windings L2a, L2b, one end of the first winding L1a of the first flyback transformer and the drain of the second power switch S2 are connected to the positive end of the input power Vin, and the other end of the first winding L1a of the first flyback transformer is connected to the first The drain of the power switch S1 and the drain of the auxiliary power switch Sc are connected, and one end of the first winding L2a of the second flyback transformer is connected to one end of the clamping capacitor Cc and the source of the...

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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 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 a 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 is connected. One end is connected to 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...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 何湘宁汪东
Owner ZHEJIANG UNIV
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