Patent ID: 7068010
Filing Date: 2006-06-27
Classification: H02M,Y02P

Abstract:
1. A motor power supply comprising: a DC-conversion part which converts AC power from an AC power input part into DC power; an inrush current limiting resistance provided between the AC power input and the DC-conversion part; an overvoltage-protection switching part provided between the inrush current limiting resistance and the DC-conversion part; a sensor which senses an output voltage of the DC-conversion part; a controller which switches the overvoltage-protection switching part On/Off to return energy stored in the DC-conversion part to the AC power input part through the inrush current limiting resistance when the output voltage of to the DC-conversion part is higher than a predetermined voltage; and a relay which selectively bypasses the limiting resistance, wherein the controller switches the relay to bypass the resistance when the output voltage reaches a predetermined voltage value, and switches the relay so that the resistance is not bypassed when the output voltage reaches the predetermined overvoltage limit.