ZERO VOLTAGE SWITCH


A zero voltage switch (ZVS) DC link, single-phase, pulse width-modulated
voltage source inverter (VSI) is proposed. Operating principle and various operating
intervals of the converter are presented and analyzed. Design consideration is
discussed and a design example of experimental results from a laboratory model is
also presented.
In proposed ZVS DC page link technique, the switch voltage is clamped to the dc
link voltage and PWM scheme can be used to control the inverter output voltage. The
PWM modulation scheme is modified to obtain optimum system performance and to
achieve ZVS at different power factor loads.
The design procedure is illustrated with a design example. An experiment
prototype laboratory model 300V, 120V, 60HZ VSI operating at 50KHZ is
implemented using MOSFET and IGBTs. Experimental results confirm the theory and
show the soft switching characteristics of the proposed VSI.