On-Resistance Monitoring Method Using Active Voltage Vectors in Three-Phase Voltage Source Inverters

초록

On-resistance of the switching devices is an aging indicator. Through monitoring on-resistances, the lifetime of the switching devices can be checked. This paper proposes an online on-resistance monitoring method using active voltage vectors in a three-phase voltage source inverter. In this paper, the alpha and beta values of active voltage vectors considering the on-resistance are examined. Based on these analyses, on-resistances are estimated by combining the alpha and beta values of active voltage vectors according to the switching state. The advantage of this paper is that on-resistances can be monitored during the operation of the inverter and two additional voltage sensors are required to estimate the six switches. Also, the proposed technique can detect a moment when an open accident is imminent by catching the relative rise in the on-resistances. The performance of the proposed method is verified through simulations and experiments.

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