Intelligent IGBT driver concept for three-phase electric drive diagnostics

This document focuses on the problem of diagnostics of an electrical drive equipped with a voltage source inverter (VSI). The attention is concentrated on a hardware design for a power system diagnostics. A new concept of a power transistor driver is proposed. This concept of the driver integrates functions for monitoring of a large number of electrical drive parameters which are transferred to the superior control system for an actual operation state evaluation or an eventual failure state detection. The proposed solution introduces the possibility of an internal electrical quantities feedback realization (phase currents and DC link voltage) directly in the drivers of power transistors without using standard current and voltage sensors. The feed-backs can be extended with output voltages measurement of the inverter which can be further used in online identification of motor parameters for a model of the electrical drive. This model can be used for a control technique adaptation (with respect to maximal efficiency, maximal dynamic performance or also for sensor-less speed control or position control).