A Novel Class-E Quasi-Constant Transconductance Rectifier

A novel Class-E rectifier with quasi-constant transconductance (QC-Gm) is proposed. The operation mechanism of the Class-E QC-Gm rectifier is investigated, and the transconductance is calculated. The rectifier exhibits zero-voltage switching (ZVS) over a wide input and output range. The QC-Gm performance of a designed 40 mS rectifier is verified in a 6.78 MHz wireless power transfer link as demonstration. The rectifier is driven by constant voltage operation mode LCC-LCC network and Class-E inverter, with unity overall DC-AC driving gain. The calculation matches the simulation, and the measurement shows that the output current is 0.96 A (±3.8%) under 25 V input voltage and 1 Ω ∼ 20 Ω loads.