1997 Volume 117 Issue 12 Pages 1441-1448
We have proposed an inductor commutation soft-switched PWM inverter (ICSI) and the carrier frequency modulated ICSI (FM-ICSI) without sensors for the current and voltage. It is realized by connecting a series circuit with an inductor LZC and a capacitor CZC between the output terminals of the conventional hard switched inverter (CHIS), and by connecting a capacitor CR in parallel with each main switch. The commutation elements LZC, CZC and CR control the magnitude of the circulating current, short current and efficiency of ICSI and FM-ICSI. The circulating current always flows through the main switches and LZC and CZC from the dc source to realize soft switching. Therefore, in this paper, the relations of the commutation elements and these currents are analyzed and verified experimentally for design of ICSI and FM-ICSI.