Abstract. In this paper, a new approach to analysis of the average and rms currents in inverter switching devices and the rms value of the ripple component of inverter input current is presented. The proposed approach is based on the probability with which the inverter switching devices receive ON signals which can be obtained from the average value of the phase-to-dc midpoint voltages. As the knowledge of the exact switching pattern is not required, this approach is especially useful for inverters in which the exact switching patterns can not be predetermined. To show the general applicability of the proposed approach, the expressions for the average and rms currents in switching devices and the rms value of the ripple component of input current of three-phase hysteresis current-controlled and PWM inverters are derived. Experimental results are included to show the validity of the proposed method.
Keywords: inverter; ON signal probability; device currents; input current ripple.
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