Patent ID: 7068037
Filing Date: 2006-06-27
Classification: G01R,H02M

Abstract:
1. A method for diagnosing inverter trouble, comprising: determining whether each of a plurality of switching devices has a fault by sequentially switching on the switching devices when an inverter is initialized by receiving power; determining that a second switching device has a fault if over current is detected due to driving of a first switching device; recording sorts and fault states of each of the plurality of switching devices having a fault; detecting whether an earth fault occurs by outputting each of a plurality of phase voltages of the inverter; recording phases having the earth fault and an earth fault state thereof; determining inverter trouble based on a fault record of the switching devices and an earth fault record; and waiting for a normal operation if the inverter has no trouble, and displaying inverter trouble and waiting for an order of a user if inverter trouble occurs.