Class E resonant rectifier with a series capacitor

This paper analyses and compares candidate zero dv/dt half-wave Class-E rectifier topologies for integration into multi-MHz inductive power transfer (IPT) systems. Furthermore, a hybrid Class-E topology comprising advantageous properties from all existing Class-E half-wave zero dv/dt rectifiers is analysed for the first time. From the analysis, it is shown that the hybrid Class-E rectifier provides an extra degree of design freedom which enables optimal IPT operation over a wider range of operating conditions. Furthermore, it is shown that by designing both the hybrid and the current driven rectifiers to operate below resonance provides a low deviation input reactance and inherent output voltage regulation with duty cycle allowing efficient IPT operation over wider dc load range than would otherwise be achieved. A set of case studies demonstrated the following performances: 1) For a constant dc load resistance, a receiving end efficiency of 95 % was achieved when utilising the hybrid rectifier, with a tolerance in required input resistance of 2.4 % over the tested output power range (50 to 200 W). 2) For a variable dc load in the range of 100 % to 10 %, the hybrid and current driven rectifiers presented an input reactance deviation less than 2 % of the impedance of the magnetising inductance of the inductive link respectively and receiving end efficiencies greater than 90 %. 3) For a constant current in the receiving coil, both the hybrid and the current driven rectifier achieve inherent output voltage regulation in the order of 3 % and 8 % of the nominal value respectively, for a variable dc load range from 100 % to 10 %.

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“…2c) is reported. Its analysis at all duty cycles is reported in [24] with an L of infinite impedance and in [27] for operation at resonance.…”

Section: Fig 2bmentioning

confidence: 99%

Class-E Half-Wave Zero dv/dt Rectifiers for Inductive Power Transfer

Kkelis

Yates

Mitcheson

2017

IEEE Trans. Power Electron.

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“…They are able to operate with high power-conversion efficiency at high frequencies that realize considerable miniaturization of power supplies. The Class-E dc-dc converter [1]- [7], which is one of the high-efficiency power sources, is composed of the Class-E inverter [8]- [15] and the Class-E rectifier [16]- [19]. The nominal waveforms of the Class-E inverter can minimize the switching power losses by the operating requirements of zero and zero slope of switch voltage at the turn-ON transition, called the Class-E switching conditions, and yield a high powerconversion efficiency (more than 90%) and low noises under a high-frequency (megahertz order) operation.…”

Section: Introductionmentioning

confidence: 99%

Resonant dc/dc Converter With Class E Oscillator

Häse¹,

Sekiya²,

Lü³

et al. 2009

IEEE Trans. Circuits Syst. I

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This paper presents a new free-running-oscillation resonant dc-dc converter with the Class-E oscillator and the Class-E rectifier, along with its design procedure and design curves for any conditions. The proposed converter is a free-running-oscillation system and has no gate-drive circuit to drive the MOSFET. Therefore, the structure of the proposed converter is simpler than that of class E 2 dc-dc converter. The proposed converter is suitable for a constant voltage and constant power operation under the fixed designed condition. The proposed converter has the ability to achieve a high power-conversion efficiency and low noises under high-frequency operation because of Class-E switching at both the oscillator and the rectifier. We investigate operations of the proposed converter by circuit experiments and show the validity of the design curves. This paper denotes two experimental results. One achieves 79.3% power-conversion efficiency under 1.54-W output power at an operating frequency 2.00 MHz. The other does 80.5% under 1.60-W output power at an operating frequency 1.98 MHz. Index Terms-Class-E oscillator, Class-E rectifier, Class-E switching conditions, numerical design resonant dc-dc converter.1 In this paper, the design curves as a function of K, H and V =V are newly shown. Moreover, we add an experimental result of the proposed converter for high H and low K, namely, H = 1 and K = 3, and show the output voltage and the power-conversion efficiency against the load variation.

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DC/DC converter with class E zero-voltage-switching inverter and class E zero-current-switching rectifier

Kazimierczuk

Jozwik

1989

IEEE Trans. Circuits Syst.

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Class E resonant rectifier with a series capacitor

Cited by 29 publications

References 8 publications

Class-E Half-Wave Zero dv/dt Rectifiers for Inductive Power Transfer

Class-E Half-Wave Zero dv/dt Rectifiers for Inductive Power Transfer

Resonant dc/dc Converter With Class E Oscillator

DC/DC converter with class E zero-voltage-switching inverter and class E zero-current-switching rectifier

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