Development of the topology and analysis of the efficiency of voltage inverters on composite resonant switches

Abstract

The paper deals with the effectiveness of composite resonant switches in a serial-parallel LCC tank of a voltage-source inverter (VSI). It has been shown that these circuits operate in the duplex mode of resonant switching, in which the main switches in the output circuit of the inverter have zero voltages and currents. The use of composite resonant switches of this type requires voltage control on the capacitor of the serial LC circuit, and there are three ways to solve this problem in a circuit. Therefore, three new variants of VSIs using composite resonant switches have been developed. The integration process of a composite resonant switch in the inverter structure is based on typical variants of VSIs with resonant commutation, which show a maximum efficiency reduction of dynamic energy loss. The effectiveness of the circuit is designed with additional power losses that accrue to the inverter via the auxiliary resonant circuit in mind. Analytical estimation of additional power losses is done by mathematical calculation of the envelope of the resonant inductor current amplitude continuously changing over the period of the inverter output frequency. It has been shown that the maximum efficiency is possessed by a circuit in which the resonant inductor is designed as a reactive component with two magnetically coupled windings.