ONLINE FAILURE DIAGNOSING SYSTEM OF MOTOR INVERTER AND ELECTRIC COMPRESSOR USING SAME

摘要

The present invention relates to an online failure diagnosing system of a motor inverter and an electric compressor using the same, which diagnoses the failure of a motor used in an electric compressor etc, and the failure of an inverter supplying an alternating current power to the motor online. The online failure diagnosing system of a motor inverter, which diagnoses the failure of an inverter outputting an alternating current power by converting a direct current power, and the failure of a motor combined to the inverter, comprises: a driving control part which applies a failure diagnosis signal to a switch, for controlling the operation of the switch during the period of charging a bootstrap capacitor combined to the switch of the inverter; a current detection part for detecting a current flowing in the inverter when the failure diagnosis signal is applied; and a failure judgment part for judging the failure of the motor, the switch or an interconnecting line between the two by comparing the current detected in the current detection part with a pre-established reference current. [Reference numerals] (110) Driving control part; (120) Current detection part; (130) Failure judgment part