INPUT-VOLTAGE ABNORMALITY DETECTION METHOD AND POWER SOURCE DEVICE

摘要

This abnormality detection method for single-phase AC input voltage is executed by a control unit having a phase-locked loop function. In the method: a simulated voltage waveform phase-locked to input voltage is sequentially generated by using a phase-locked loop; an instantaneous value of the input voltage is compared with the generated simulated voltage waveform, within a time before the simulated voltage waveform is next updated; and when a state where the instantaneous value of the input voltage is along the simulated voltage waveform is shifted to a state where the instantaneous value of the input voltage is not along the simulated voltage waveform, the input voltage is determined to be abnormal.