Patent ID: 7561449
Filing Date: 2009-07-14
Classification: H02H,H02M

Abstract:
1. A device for converting DC voltage to AC voltage, the device comprising: a voltage conversion circuit including a pair of first input terminals and a pair of first output terminals insulated from the pair of first input terminals, wherein the voltage conversion circuit receives the DC voltage with the pair of first input terminals, converts the DC voltage to voltage having a polarity corresponding to the AC voltage, and outputs the converted voltage from the pair of output terminals; a filter circuit including a pair of second input terminals and a pair of second output terminals, wherein the filter circuit receives the converted voltage with the pair of second input terminals, smoothes the converted voltage, and outputs the smoothed voltage from the pair of second output terminals as the AC voltage; a first switch arranged between the pair of first output terminals and the pair of second input terminals, wherein the first switch operably connects the voltage conversion circuit and the filter circuit; a second switch arranged between the pair of second input terminals; an output current detection circuit for detecting overcurrent that is greater than a predetermined first threshold; and a protection circuit, wherein when overcurrent that is detected is greater than the first threshold, the protection circuit stops supplying power to the pair of first output terminals from the pair of first input terminals, deactivates the first switch, and activates the second switch.