Single phase to three phase rectifier/inverter with DC ripple compensation

摘要

In a power converter apparatus, variations contained in a single-phase AC input voltage cause a beat phenomenon in a three-phase DC/AC inverter. To avoid such a beat phenomenon, the single-phase AC input voltage is converted into a DC input voltage having ripple components and the ripple components are filtered from the input voltage so as to derive an input DC voltage. The input DC voltage is inserted into a three-phase AC voltage. Variations contained in the single-phase AC input voltage are detected to obtain a variation detecting signal and the inversion is controlled in a pulse width modulation control mode based upon the variation detecting signal and a reference signal.