Analysis of Class DE inverter with thinned-out driving patterns

This work presents a numerical analysis for Class DE inverter with eliminated driving pulses. The harmonics, the low frequency components, and the power conversion efficiency are calculated and shown. Class DE inverter is one of the high-frequency and high-efficiency resonant power sources, which has the hybrid features of Class D and Class E circuits. To regulate the output power with keeping high efficiency, various methods have been proposed. Thinned-out method is one of them, which regulates the output power by eliminating the driving pulses. The principle is quite simple and is seen suitable for digital control. However the harmonics, low frequency components, and discontinuous regulation have been pointed out. An aim of this paper is to clarify the characteristic of Class DE inverter with thinned-out driving patterns. A basic circuit is designed for 25 percent of switch ON duty ratio at 1 MHz. In series of 16 cycles of switching pulses, 1 to 15 cycles are eliminated. All variations of the eliminations are taken into consideration. The various waveforms, voltage and current parameters, distortions, and efficiency have been calculated and clarified.