| 摘要 |
A capacitor-input type three-phase rectification circuit comprises a three-phase AC power supply ( 1 ), a diode rectifier circuit ( 4 ), and a low-frequency filter connected between the three-phase AC power supply ( 1 ) and the diode rectification circuitry ( 4 ), the low frequency filter consisting of AC reactors ( 2 u)( 2 v)( 2 w) and Delta-connection or Y-connection capacitors ( 8 u)( 8 v)( 8 w), so that higher harmonic currents are reduced to be equal to or less than standard values, and that lowering in input power factor and lowering in DC voltage are prevented from occurrence.
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