A Novel Topology of Constant-Current ZVS Class E Inverter Designed Based on Frequency-Domain Method

This paper presents a novel topology of Class E inverter with zero-voltage switching (ZVS) and consistent current, cascading the input switch unit with output network. Both the duty cycle and switching frequency remain constant even with load variations. Basing on frequency-domain analysis, the new inverter topology can simplify the design procedure of the constant current realization and the analysis of load-independent ZVS. A prototype operating at 6.78 MHz, the input voltage 10 V and output current 0.8 A was built to verify the proposed configuration. In circuit LTspice simulation and experiments, constant amplitude AC output current and ZVS were verified across the load resistance range in 0.5, 30 and 50 Ω, which is 2.5 times state-of-the-art in load range.