Active zero voltage switching tracking controller design for class E inverter to counteract the resonant components shifting

Abstract

On the basis of zero voltage switching (ZVS) operation, the class E resonant converter provides excellent conversion efficiency even though it works on high frequency. Unfortunately, the ZVS operation is sensitive to the circuit situations. While the circuit components are shifting, the ZVS working will drift around the dominant point and it may fail to work on ZVS. In this study, an active ZVS tracking control method is proposed to cope with the circuit components shifting. On the basis of an exact analysis of the ZVS operation conditions, first a searching procedure is proposed to decide the optimal switching frequency. Next, through the current phase feedback, the active ZVS tracking controller is built to retain the circuit works on optimum ZVS operation by adaptively tuning the switching frequency to counteract the components shifting. In addition to the theoretical analysis and computer simulation, the proposed tracking controller has been applied to implement a 1.3 MHz class E inverter with a field-programmable gate array (FPGA)-based controller.

Probabilistic evaluation of power converters as support in their design

“…Therefore, the component value variations due to environment and ageing can shift the PC to operate at high switching losses and, therefore, out of the acceptance region R A [13,[16][17][18][19].…”

Design of class‐E M amplifier with consideration of parasitic non‐linear capacitances and on‐state resistance

“…Class‐D PA is used as an audio amplifier, it has high efficiency in comparison with the classic PA, but it has lower efficiency in comparison with switch‐mode PAs such as class‐E and class‐E M . Several studies have been performed on class‐E and E −1 PAs [3–12]. The class E PA has better efficiency [1] compared with other classes of PAs.…”

“…A tuned output power class‐E PA with considering the ideal switch and well specifications such as high power‐added efficiency and low output distortion using a tunable matching circuit has been designed in [10]. The class‐E PAs have been designed as resonant converters in [11, 12]. To achieve high efficiency in class‐E M PAs, with an auxiliary circuit ZCS and ZDCS conditions, moreover, zero‐derivative voltage switching (ZDVS) and zero voltage switching (ZVS) conditions are obtained.…”

Hybrid control of the dc–dc SRC operating below resonance

“…The inherent soft switching and reduced switching losses allow a higher operating frequency [1,2]. High frequencies are desirable since they result in smaller and lighter magnetic components and faster transient responses [3,4]. In consequence of these features and the ever increasing demand for higher power density, higher efficiency, and lower electromagnetic interference, the resonant converters are currently of widespread interest and used in many industrial applications such as power supply for radio-frequency sources [5], induction heating [6], light-emitting diode driver [7], dielectric barrier discharge [8], and battery charger for electric vehicles [9].…”