Class E inverter using thinned-out method

This paper proposes a new control scheme for the class E inverter. This method generates the output voltage and power by thinning out on-pulses of driving signals which turns switch on and off. The advantages of the proposed scheme are the operation at fixed operating frequency, unnecessity of enlargement of the circuit scale, and suitability for controlling wide output range. Especially, the proposed control scheme keeps high efficiency for class E inverter with low loaded quality factor and low input inductance. We carry out numerical analyses and circuit experiments. The laboratory experiments show that the inverter with low quality factor and a small de-feed inductor maintains the output voltage from 100% to 16% with keeping 68% of power conversion efficiency. The inverter with high quality factor and high de-feed inductor can be controlled output voltage from 100% to 52% with keeping 53% of power conversion efficiency.

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