In time voltage commutation circuit where it boosts the AC power supply which is rectified in

摘要

PPROBLEM TO BE SOLVED: To provide a circuit that detects which capacitor deteriorates in a voltage doubler rectifier circuit with a voltage doubler capacitor and a smoothing capacitor. PSOLUTION: In the voltage doubler rectifier circuit with a voltage doubler capacitor and a smoothing capacitor, a deterioration determination circuit of the voltage doubler capacitor determines deterioration in the voltage doubler capacitor on the basis of a phase deviation between a measurement value of an input-current peak calculated by an input-current peak phase calculation unit and a reference value of the input-current peak preset by the input-current peak phase calculation unit. In order to determine the deterioration in the voltage doubler capacitor, it is desirable to execute the determination not only on the basis of the phase deviation of the input-current peak value but also by comparing a measurement value of an average voltage with a reference value. It is possible to determine deterioration in the smoothing capacitor on the basis of a ripple voltage value and the average voltage by further adding a deterioration determination part for the smoothing capacitor to the deterioration determination circuit of the voltage doubler capacitor. PCOPYRIGHT: (C)2011,JPO&INPIT