| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter control circuit which creates a cyclic period without pulse generation in a PWM signal of each phase, thereby cyclically stopping a switching operation by a switching element to reduce a switching loss. <P>SOLUTION: The inverter control circuit controls an output from a three-phase inverter circuit into a three-phase balanced output by a PWM signal. The inverter control circuit includes an instruction value signal generating means 61 which generates a first instruction value signal whose one-period waveform turns to zero in the first 1/3 period, to a sine waveform having a phase span of 0 to 2π/3 in the next 1/3 period, and to a sine waveform having a phase span of π/3 to π in the last 1/3 period, a second instruction value signal which is advanced in phase to the first instruction value signal by 2π/3, and a third instruction value signal delayed in phase by 2π/3, and a PWM signal generating means 62 which generates a PWM signal based on an instruction value signal. <P>COPYRIGHT: (C)2010,JPO&INPIT |
