公开(公告)号：EP1630943B1

公开(公告)日：2017-12-27

申请号：EP04745304.8

申请日：2004-05-25

申请人： TABUCHI ELECTRIC CO.,LTD. ,  Sharp Kabushiki Kaisha

发明人： MIYAZAKI, Shinobu ,  NAKAISHI, Masaki ,  MASUDA, Shinichi

IPC分类号： H02M1/42

CPC分类号： H02M1/4208 ,  Y02B70/126

摘要： An oscillation control signal generated by an inverter power source control circuit (12) includes a reference voltage setting signal for approximating the current waveform of the AC output form the AC power source (1) to a sinusoidal wave by making both sides of the waveform generate current according to the fluctuation of the PWM control signal, and a waveform shaping signal consisting of a peak adjustment signal of a sinusoidal waveform for approximating the waveform peak portion of the current waveform to a sinusoidal wave by subtraction. Accordingly, even if the PWM control signal fluctuates, it is possible to automatically improve the power factor of the power source circuit to a value higher than a predetermined value by approximating the current waveform of the AC output from the AC power source to the sinusoidal wave, thereby improving the efficiency of the power source.