Patent ID: 8069000

Claim:
An aging status diagnostic apparatus for a power conversion system, comprising: an output current sensing means installed on an output stage line of an inverter switching module of the power conversion system, and configured to detect output current of the inverter switching module; and a measurement and diagnosis means configured to receive the output current of the inverter switching module from the output current sensing means, calculate one or more of an average value of the output current over one period, and magnitude or an effective value of each harmonic of the output current, and determine whether aging of the inverter switching module has occurred, wherein the measurement and diagnosis means determines that the aging of the inverter switching module of the power conversion system has occurred if the average value of the output current over one period increases by a value equal to or greater than a predetermined range and/or an even order harmonic or a specific order harmonic based on FFT of the output current increases by a value equal to or greater than a predetermined range.