| CPC H02H 3/083 (2013.01) [H02M 1/32 (2013.01)] | 7 Claims |
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1. A surge suppression circuit that is configured to be used in a rotating electrical machine system comprising a switching circuit comprising a plurality of switching elements and a rotating electrical machine connected thereto via an electrically conducting path comprising a plurality of electrically conductive bodies, and suppresses surge voltage generated in a plurality of connecting lines connecting the plurality of electrically conductive bodies to windings of plural phases of the rotating electrical machine, the surge suppression circuit comprising:
a plurality of upper diodes with anodes respectively connected to the plurality of connection lines;
a plurality of lower diodes with cathodes respectively connected to the plurality of connection lines;
an upper line connected to respective cathodes of the plurality of upper diodes;
a lower line connected to respective anodes of the plurality of lower diodes; and
a voltage holding circuit connected between the upper line and the lower line,
wherein the voltage holding circuit comprises a charging unit to store electric charge by the surge voltage and a discharge unit to discharge the electric charge stored in the charging unit, and
wherein an inrush current suppression resistor to suppress inrush current into the charging unit is connected at least between the respective cathodes of the plurality of upper diodes and the charging unit or between the respective anodes of the plurality of lower diodes and the charging unit.
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