The input side diode bridged circuit which is connected to the input side of the matrix converter which converts

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive snubber circuit for a power conversion circuit that has a surge absorption function and a power consumption function.;SOLUTION: The snubber circuit S for the power conversion circuit includes: an input-side diode bridge circuit 4 to be connected to the input side of a matrix converter 3 for converting a three-phase AC input voltage into a predetermined single-phase AC output voltage, an output-side diode bridge circuit 5 to be connected to the output side of the matrix converter, a DC circuit part 10 having a snubber capacitor 11 to be connected between the input-side diode bridge circuit 4 and the output-side diode bridge circuit 5, and a DC circuit control part C for controlling the operation of the DC circuit part 10. The DC circuit part 10 has a switching circuit 12 and a resistor circuit 13 mutually connected in series. The DC circuit control part C controls the switching circuit 12 to an ON-state in synchronization with a predetermined timing of the single-phase AC output voltage.;COPYRIGHT: (C)2011,JPO&INPIT