Patent ID: 8913405

Claim:
A power converting apparatus, comprising: three input terminals configured to respectively receive a phase voltage of three-phase AC; three output terminals; first and second DC power supply lines; a converter including a first switch device group including a first set of three switch devices connected between said first DC power supply line and said input terminals, and a second set of three switch devices connected between said second DC power supply line and said input terminals, an inverter including a second switch device group including a first set of three switch devices connected between said first DC power supply line and said output terminals, and a second set of three switch devices connected between said second DC power supply line and said output terminals, a carrier generating unit configured to generate a carrier having a waveform in which an absolute value of a slope is constant with respect to time, with a reference internally dividing an amplitude of said waveform into a first value and a second value, said first and second values being current conduction rates; a converter gate signal generating unit configured to perform commutation of said converter at a timing at which said carrier takes said reference; and an inverter gate signal generating unit configured to allow adoption of a zero voltage vector as a switching mode of said inverter in a period in which said carrier changes a first command value to a second command value, said first command value internally dividing a region from said reference to a maximum value of said carrier at a ratio between a third value and a fourth value, and said second command value internally dividing a region from a minimum value of said carrier to said reference at a ratio between said third value and said fourth value, said third value being an output voltage command, and said fourth value being obtained by subtracting said voltage command from said amplitude of said carrier.