PWM inverter apparatus

摘要: An PWM inverter of the present invention, for converting a direct current voltage to an alternating voltage, generating pulses, width said pulses being modulated, corresponding at least one output demand and fundamental wave frequency comprises period changing means pulse period, demand, modulation mode asynchronous over-modulation wider width, generated in vicinity each peak wave, than widths zero-crossing as controlling voltages, wherein gradually decreases order increases number narrow mode.