Patent ID: 8310848
Filing Date: 2012-11-13
Classification: H02M

Abstract:
1. A direct AC power converting apparatus, comprising: first to N-th input lines connected to an N-phase AC power supply; a power supply switch conduction/nonconduction of said first to N-th input lines; a positive-side DC power supply line and a negative-side DC power supply line; a current-source power converter including a plurality of switch devices, converting an AC voltage input from said first to N-th input lines into a square-wave-shape voltage having two potentials by selection operations of said plurality of switch devices to supply said voltage to said positive-side DC power supply line and said negative-side DC power supply line; a plurality of input capacitors each provided between ones of said first to N-th input lines and functioning as a voltage source; a first diode connected between said positive-side DC power supply line and said negative-side DC power supply line; a capacitor connected, between said positive-side DC power supply line and said negative-side DC power supply line, in series with said first diode; a first resistor provided on said first input line; a voltage-source power converter converting said DC voltage having two potentials between said positive-side DC power supply line and said negative-side DC power supply line into a square-wave-shape AC voltage and outputting to an inductive multi-phase load; and a control section controlling the selection operations of said plurality of switch devices and said power supply switch, and controlling the selection operations of said switch devices simultaneously with or prior to conduction of said power supply switch to connect said capacitor and said input capacitor provided between said first input line and said second input line in parallel with each other.