A power supply for a vibrating compressor

摘要

The present invention selectively changes over a DC power supply from a battery 2 to a voltage obtained by converting a commercial power to DC. The inverter 6 converts DC into AC though the alternate switching of two switching elements, and the control section 7 controls an AC output to be supplied from the inverter to the vibrating compressor 1. The DC/DC converter 17 control the output voltage to a predetermined value, regardless of changes in input voltage so that an AC output of a predetermined voltage value can be supplied to the vibrating compressor 1 relying on multiple types of commercial powers of different voltages and multiple types of batteries of different voltages. The present invention can automatically adapt for widely changing power voltages and judge a drop of battery voltage, regardless of a wide range of input voltages.