| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a detection circuit for the reduction of a filter capacitor capacitance, which allows reduction in size. <P>SOLUTION: The detection circuit for the reduction of a filter capacitor capacitance comprises an inverter which converts direct-current power into alternating-current power, a filter capacitor connected to the direct-current side of the inverter, and a voltage detector which detects the terminal voltage of the filter capacitor. The detection circuit further comprises a discharging portion which discharges electric charges in the filter capacitor, a means for computing the filter capacitor capacitance from the output of the voltage detector, and a means which generates a signal indicating the reduction of the filter capacitor capacitance if the filter capacitor capacitance computed by the means for computing the filter capacitor capacitance is equal to or less than a predetermined value. <P>COPYRIGHT: (C)2004,JPO |
