Class E half-wave low dν/dt rectifier operating in a range of frequencies around resonance

Birca-Galateanu, Ş.; Cocquerelle, Jean-Louis

doi:10.1109/81.372848

Cited by 23 publications

(10 citation statements)

References 6 publications

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“…2d) was introduced in [6], where it was developed from an isolated voltage driven Class-D half-wave rectifier. The analysis of this topology at all duty cycles was reported in [26] for operation at resonance and in [30] for an ω varying around resonance. In [23] the first implementation of the series-C VDR (Fig.…”

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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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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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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“…To combat this problem, the authors in [11] suggested increasing the input voltage; however, high input voltage may lead to device breakdown due to excessive heat generated and cause lower operating efficiencies. In [12][13][14][15][16][17], authors proposed the uses of lossy, complex and bulky additional components and power consuming active devices for feedback and communications to achieve constant output voltage. Moreover, authors in [18,19] suggested a non-radiative magnetic coupling approach to deliver power more efficiently; but the effective transfer range was basically restricted to one coil diameter unless relay resonators are adopted [20].…”

Section: Introductionmentioning

confidence: 99%

Efficiency Improvement of a Class E² Converter for Low Power Inductive Links

Bati

Luk

Aldhaher

et al. 2019

2019 26th International Workshop on Electric Drives: Improvement in Efficiency of Electric Drives (IWED)

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This work presents a model of a Class E 2 converter for wireless medium power transfer applications. The converter operates at frequency of 200 kHz and consists of an inductive link with its primary coil driven by a class E inverter and the secondary coil with voltage driven class E synchronous rectifier. A 7th order linear time invariant LTI state-space model is used to obtain the eigenvalues of the system for the four modes caused by the operation of the converter switches. A participation factor for the four modes is used to find the actual operating point dominant poles for system response. A dynamic analysis is carried out to investigate the effect of changing separation distance between the two coils based on converter performance and the changes required of some circuit parameters to achieve optimum efficiency and stability. The results show an excellent achievement in terms of efficiency (90-98%) and maintaining constant output voltage by the use of a PI controller with dynamical change of capacitors in the inverter.

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“…The rectifier was designed for maximum link efficiency and for power transfers greater than 100 W. The considerably large inductance required by the magnetic link properties and the fact that the inductor in Fig. 1a conducts a high frequency high amplitude current [7], [8], degraded the efficiency of the topology due to losses in the magnetic core. In the rectifier with a series capacitor, Fig.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Class-E low dv/dt rectifier for high frequency inductive power transfer

Kkelis

Yates

Mitcheson

2016

2016 IEEE Wireless Power Transfer Conference (WPTC)

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This paper presents the design and implementation of a voltage driven hybrid Class-E low dv/dt half wave rectifier with focus on high frequency (HF), 3 -30 MHz, inductive power transfer (IPT). The hybrid rectifier is capable of absorbing the parasitic capacitance of the utlised diode while maintaining the properties of the conventional Class-E rectifier with a series capacitor. The hybrid rectifier introduces two degrees of design freedom which enable circuit optimisation over a wide range of IPT requirements. A case study investigated the performance of three different hybrid rectifier designs of the same input (AC) and output (DC) resistance. All designs proved to be tolerant to diode parasitics as they maintained nearly constant efficiency and input resistance profiles over the entire tested output power range (50 W to 200 W). The worst case deviations in efficiency and input resistance profiles were 4 % and 7 % respectively. The lowest recorded receiving end efficiency was 91 % and the highest was greater than 95 %, when a 14.5 A current capability SiC Schottky diode was deployed.

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Class E half-wave low dν/dt rectifier operating in a range of frequencies around resonance

Cited by 23 publications

References 6 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

Efficiency Improvement of a Class E² Converter for Low Power Inductive Links

Hybrid Class-E low dv/dt rectifier for high frequency inductive power transfer

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Class E half-wave low dν/dt rectifier operating in a range of frequencies around resonance

Cited by 23 publications

References 6 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

Efficiency Improvement of a Class E2 Converter for Low Power Inductive Links

Hybrid Class-E low dv/dt rectifier for high frequency inductive power transfer

Contact Info

Product

Resources

About

Efficiency Improvement of a Class E² Converter for Low Power Inductive Links