Load-Indenpendent Class-E Inverter with a Class-D Rectifier

This paper discusses a circuit topology in which a class-D rectifier is employed at the output port of a conventional load-independent class-E inverter instead of a pure resistor. In order to confirm whether the load-independent mode can be still maintained in the class-E inverter with applying class-D rectifier in its output port, a design method based on a numerical design algorithm is given. The Zero-Voltage-Switching (ZVS) and constant-output-voltage conditions, which are considered in the conventional load-independent class-E inverter with a pure resistor load, are utilized as the constraints for designing the class-E inverter with a class-D rectifier. The results obtained from the numerical design algorithm are in good agreement with those obtained from experiments, which indicates the load-independent mode can be maintained even replacing the pure resistor with a class-D rectifier in the class-E inverter. Meanwhile, this result also implies that the class-D rectifier can be equivalent to a pure resistor.