Steady-state analysis and design of class-DE inverter at any duty ratio
Hiroo Sekiya, Xiuqin Wei, Tomoharu Nagashima, and Marian K. Kazimierczuk
IEEE Transactions on Power Electronics, vol.30, no.7, pp.3685-3694, July, 2015. [pdf document]

<Abstract>

This paper presents a steady-state analysis and design equations for the class-DE inverters at any duty ratio and high loaded quality factor, taking into account nonlinear MOSFET drain-source and gate-drain parasitic capacitances with any grading coefficients of the diode junctions. Additionally, maximum operating frequency, power output capability, and power-conversion efficiency of the class-DE inverter are also obtained. It is shown that the maximum operating frequency is the highest when the switch-on duty ratio is 0.25. From the obtained results, it can be stated that the switch-on duty ratio of the class-DE inverter should be specified in the range of 0.25 <= D < 0.5.