Small-signal modeling of a DC-DC Class-E piezoconverter based on generalized averaging method

In this paper, a new small-signal model for the Class-E DC-DC converter with piezoelectric transformer is presented. The model was obtained using the generalized averaging method, through Fourier harmonics approximation. The model describes all poles and zeros of the system, being accurate for heavy and light loads. The converter was suppose to work under Zero Voltage Switching conditions, and this information was used to simplify the model derivation. Experimental frequency responses demonstrate similar results with the presented model, what validates the method for a higher order resonant converter. The measurements were achieved for a 3W step-down converter, with universal 85-265 V AC input and 6 V DC output voltages.