Analysis and design of generalized class-E rectifier

Abstract

This paper presents a semi-analytical expression of the generalized class-E rectifier. Effect of low output-filter inductance is included in the theoretical formula presented in this paper. The harmonic components are considered in the current flowing through the outputfilter inductance. For obtaining the theoretical waveforms, the coefficients of each frequency component are obtained by numerical calculations. By using the semi-analytical expression, characteristics of the class-E rectifier can be comprehended in a theoretical manner. By varying the output-filter inductance, it is possible to improve the rectifier characteristics, such as larger power output capability and zero input reactance, compared with the traditional class-E rectifiers. This paper also presents two examples of designs and implementations of resonant converters with the class-E rectifier. The validity of the semi-analytical expression and design strategies were confirmed from the quantitative agreements with experimental and PSpice simulation results.

Generalized Analysis and Performance Investigation of the Class-E/Fn Rectifiers

“…Additionally, N = 5 is adopted in the investigations. We confirmed that N = 5 is sufficiently large to derive the accurate waveforms [3]. Figure 6 shows the maximum value of the power output capability c pmax and ωL 2 /R to obtain c pmax for fixed ωL f /R as a function of ωC D R. For drawing this figure, the ωL f /R is fixed firstly.…”

“…Therefore, the current i f has a sufficiently small ripple, which can be ignored. A sizable current ripple, however, appears in case of the low Q of the output filter, as shown in Fig 2. The rectifier design is more flexible by considering any Q of the output filter as a design parameter [3], [11]. There is, however, no investigation of the class E/F n rectifier at any Q of output filter until now.…”

“…In the detailed investigations of the class-E rectifier suggest that zero input reactance can be obtained by varying the Q value of the output filter [3], [11]. Therefore, we may establish the theoretical design method of the class-Φ n rectifier by using the analytical waveform equations of the class-E/F n rectifier at any Q of the output filter.…”

“…There is, however, no discussion about the class-Φ n rectifier. It is suggested in [3] and [11] that the pure-resistive rectifier can be designed when we consider a low Q of the output filter.…”

Steady-state analysis and design of class-E rectifier using discrete Fourier transforms

“…The resonant rectifiers are suitable for high-frequency and high-efficiency operations due to the soft switching. The class-E rectifier [7,8] is one of the typical resonant rectifiers. The rectifier has a single diode which largely reduces the conduction loss compared to the other types of resonant rectifiers.…”