Analysis of a 3-Phase Inverter with Resistive Load

Commutation in thyratron or ignitron inverters can be effected with the aid of capacitors connected across the output terminals of the inverter. Since these inverters require no transformers for commutation or coupling, they may be operated over a wide range of frequencies extending down to zero. In this paper a simplified analysis is made of a 3-phase capacitor-commutated inverter with a resistive load when the inverter is operating with constant input current. Calculated waveforms of the inverter obtained from this analysis are presented for various values of load resistance. Experimental waveforms are included to evaluate the effect of ripple in the input current.