Exactly analysis of ZVS behavior for class E inverter with resonant components varying

A compact high efficient inductive power transfer (IPT) topology based on pulse position control is proposed for wireless charging of electric vehicle. Near-field wireless charging is efficiently achieved by the resonance-enhanced IPT technique. The system sustains high power transfer efficiency under contingency in misalignment of pickup coil and load variations. The performance evaluation of the proposed system under the occurrence of anticipated perturbation in load and mutual inductance is studied numerically. Experimental results from the developed prototype corroborate the theoretical and simulated results discussed in the proposed study.

Section: Switching Lossesmentioning

confidence: 99%

“…However, turn on switching losses will occur. To reduce the turn on losses, diode followed by capacitor combination is connected across the switch [27, 28]. The conventional ZVS switching has reduced the turn on switching losses by 85%.…”

Section: Experimental Studiesmentioning

confidence: 99%

Compact pulse position control‐based inverter for high efficiency inductive power transfer to electric vehicle

Varikkottil

Daya

2020

“…Analysis of the ZVS drifting and the variations of circuit behaviour while the circuit components are varying were proposed in [5, 16]. In these literatures, an exact circuit model in frequency domain was proposed to analyse the ZVS behaviour of the class E inverter.…”

Section: Introductionmentioning

confidence: 99%

“…Continuing the study on the class E inverter design, in this paper, we focus on an active ZVS tracking controller design based on the concepts of tuning the switching frequency and the analysis of ZVS conditions in [16]. By analysing the correlation of realistic shifting angle and the optimal shifting angle of load current, in this paper, a searching procedure for the optimal switching frequency is proposed to decide the operation frequency for the practically class E inverter designing.…”

Section: Introductionmentioning

confidence: 99%

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

Li¹

2015

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.

“…Tu and Toumazou [4] designed a class E amplifier on integrated circuit with 1.8 GHz resonant frequency. Various topologies have appeared to expand the applications of class E circuit such as class E inverter [3,[5][6][7][8][9][10][11][12], class E DC/DC converter [5,13,14] and class E rectifier [7]. Also, the class E circuits are applied to RF power amplifier [4,15], induction heating system [11,15,16] and RF powering [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Exact analysis and design of zero voltage switching operation for class E inverter with circuit components varying

Li¹

2013

In this study, an exact circuit model for the class E inverter is proposed to analyse the circuit behaviour in frequency domain without mathematical assumptions. Through this model, a close form formula is proposed to solve the load current and drain-source end voltage of metal oxide semiconductor field effect transistor at switching instants in steady-state instead of complicated numerical iteration. With these current and voltage at switching instants, the load current can be expressed with exact function and evaluated. By means of the proposed formula and current expression, the optimal and suboptimal conditions for the zero voltage switching (ZVS) operation have been expressed in terms of the shifting angle of load current with respect to drain-source voltage. Further, the ZVS and non-ZVS operation regions can be marked via calculating the shifting angle and optimal shifting angle, which are proposed in the study. To demonstrate the proposed formulas and ZVS conditions, some examples are given to examine the analysis and ZVS drifting behaviour with comparing of calculation, simulation and experiment. Good agreements from the illustrated examples have given the verification of the analysis and design for the class E inverter.