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A novel topology of zero-current switching voltage-source PWM inverter for high-power applications

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1 Author(s)
P. Tomasin ; Dept. of Electr. Eng., Padova Univ., Italy

A new scheme of soft-switched VSI three-phase inverter, capable of true PWM, is presented. It utilizes inductors in series with the main switches to limit di/dt during turn on, while the inductor energy is recovered by a resonant turn off process, which is allowed by the presence of two auxiliary switches. As inductive di/dt snubbers are usually needed in high-power GTO power converters, the proposed topology offers a solution to the problem of snubber energy recovery. The control strategy explained in the paper allows both full-range PWM and minimization of stresses during the resonant commutation process. Results of a theoretical analysis and design criteria are reported in the paper. Examples of PWM control schemes are also described, both for analog (ramp-comparison based) and digital (space-vector based) implementations. Experimental results obtained from a small-size laboratory prototype are given

Published in:

Power Electronics Specialists Conference, 1995. PESC '95 Record., 26th Annual IEEE  (Volume:2 )

Date of Conference:

18-22 Jun 1995