Patent ID: 8189356
Filing Date: 2012-05-29
Classification: H02M,H03K

Abstract:
1. A PWM inverter for controlling an AC voltage using a PWM signal, the PWM inverter comprising: a DC-to-AC converting section configured to convert a DC voltage into the AC voltage; and a PWM signal generating section configured to generate the PWM signal by comparing an signal wave with a carrier wave, wherein the PWM signal generating section comprises a phase adjusting section configured to compensate a phase of the signal, wave by adding, to the phase of the signal wave, a phase delay component of the PWM signal which is caused by digital control of the signal wave wherein in a case where a control frequency for generating the signal wave is equal to a carrier wave frequency multiplied by a certain number, the PWM signal generating section advances the phase of the signal wave by adding, to the phase of the signal wave, a phase corresponding to a half of a control period for generating the signal wave divided by a ratio of the control frequency with respect to the carrier wave frequency.