| 摘要 |
The electric power conversion device includes an AC section, a DC section, a switching section connected between the AC section and the DC section for making power conversion by switching operation, and a control section for control the switching section. In the DC section is installed a ripple detection device for detecting a ripple component emerging into the DC side and for generating a ripple detection signal. When the DC component is included in the output current of the AC section, a ripple component having the same frequency with the AC frequency of the AC section output current is superimposed in the DC section. The ripple detection device is installed in the DC section, and thereby the ripple component emerging into the DC section is detected by the ripple detection device as a reflection of the DC offset included in the output current. The control section receives the ripple detection signal from the ripple detection device, generates the DC component compensation signal for controlling the DC component included in the AC side current based on the ripple detection signal, and controls the switching section by the control signal including the DC component compensation signal to compensate the DC offset.
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