In the PWM signal generation circuit which generates the signal in order PWM to control the inverter device which converts program null direct current power because the systematic run type inverter system

摘要

PROBLEM TO BE SOLVED: To provide a PWM signal generating circuit capable of suppressing noises caused from an inverter device, and preventing deterioration in power conversion efficiency of the inverter device.;SOLUTION: The PWM signal generating circuit for generating a signal used to PWM-control the inverter device includes: a carrier signal generating means; a command value signal generating means; and a pulse signal generating means for generating a pulse signal from the carrier signal and the command value signal. The carrier signal generating means generates a carrier signal having a frequency based on the state amount of a DC power supply for generating DC power, and sets the frequency of the carrier signal to be generated at not less than a predetermined frequency near the upper limit of human audible band if the state amount is not less than a predetermined value, and sets the frequency of the carrier signal to be generated at less than the predetermined frequency if the state amount is less than the predetermined value.;COPYRIGHT: (C)2009,JPO&INPIT