Influence of DC Supply Voltage Unbalances on the Performance of ARCP Inverters

The auxiliary resonant commutated pole inverter (ARCPI) is an attractive soft switching topology due to its small Electromagnetic Interference (EMI), voltage and current stresses. This topology has previously been investigated for balanced DC input voltages, which not always occur in practical applications. This paper therefore presents an analysis of an ARCPI with unbalanced DC supply voltage to determine necessary conditions to also achieve soft switching for reduced losses in the load current switches under such conditions. First, the necessary timings of the switches are calculated and validated through simulation. Then, possibilities to optimize the behavior of this topology are discussed.