Patent ID: 7310475

Claim:
A motor driving apparatus comprising: a power supply; a DC/DC converter connected to said power supply; an inverter connected to said DC/DC converter; a DC link capacitor connected between said inverter and said DC/DC converter for smoothing a voltage; and a control circuit for controlling power supply from said DC/DC converter to said inverter in a manner that a period in which output current of said DC/DC converter becomes zero takes place in a period during which an input current to said inverter is zero, wherein said inverter and said DC/DC converter are based on triangular wave comparing type PWM control; said DC/DC converter is a 2-phase DC/DC converter having a first DC/DC converter and a second DC/DC converter, a carrier signal of said first DC/DC converter and a carrier signal of said second DC/DC converter having a phase difference of 180 degrees, and a boosting ratio command variable being less than two; and said control circuit matches timing of peaks of a carrier signal of said inverter and timing of valleys of the carrier signal of said first DC/DC converter, and timing of valleys of the carrier signal of said inverter and timing of valleys of the carrier signal of said second DC/DC converter.