| 摘要 |
PROBLEM TO BE SOLVED: To prevent an inverter from stopping without flowing overcurrent through an electrolytic capacitor, even when voltage drop or power failure in a commercial power source under a condition, when the power supply voltage of the commercial power source, is lower than a rated voltage. SOLUTION: In a power supply system which conducts power supply from a commercial power source 4 to a DC load 3 having a rectifier 1 for capacitor input, an inverter 6 is provided which compensates load voltage before voltage drop or power failure by supplying power from a battery 5 to the Dc load 3 when the voltage drop or power failure in the commercial power source 4 occurres, and a command value regulating circuit 13 is provided which changes an output voltage command value Vref with the power supply voltage of the commercial power source 4, based on the load voltage detected from the power supply system. The command value regulating circuit 13 is composed of an effective value conversion circuit 14, a filter circuit 15, a limiter circuit 16 for upper and lower limits, a reference voltage generating circuit 8, and a multiplying unit 17. |
