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Energies 2018, 11(10), 2653; https://doi.org/10.3390/en11102653

An Improved Autonomous Current-Fed Push-Pull Parallel-Resonant Inverter for Inductive Power Transfer System

1
School of Microelectronics and Communication Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400044, China
2
Chongqing Engineering Laboratory of High Performance Integrated Circuits, Chongqing 400044, China
*
Author to whom correspondence should be addressed.
Received: 8 August 2018 / Revised: 23 September 2018 / Accepted: 1 October 2018 / Published: 4 October 2018
(This article belongs to the Special Issue Wireless Power Transfer 2018)
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Abstract

In the inductive power transfer (IPT) system, it is recommended to drive the resonant inverter in zero-voltage switching (ZVS) or zero-current switching (ZCS) operation to reduce switching losses, especially in dynamic applications with variable couplings. This paper proposes an improved autonomous current-fed push-pull parallel-resonant inverter, which not only realizes the ZVS operation by tracking the zero phase angle (ZPA) frequency, but also improves the output power and overall efficiency in a wide range by reducing gate losses and switching losses. The ZPA frequencies characteristic of the parallel-parallel resonant circuit in both bifurcation and bifurcation-free regions is derived and verified by theory and experiments, and the comparative experimental results demonstrate that the improved inverter can significantly increase the output power from 7.68 W to 8.74 W and has an overall efficiency ranging from 63.5% to 72.5% compared with the traditional inverter at a 2 cm coil distance. Furthermore, with a 2-fold input voltage (24 V), the improved inverter can achieve an approximate 4-fold output power of 38.9 W and overall efficiency of 83.6% at a 2 cm coil distance. View Full-Text
Keywords: inductive power transfer (IPT); frequency bifurcation; current-fed push-pull; resonant inverter; wireless power transfer inductive power transfer (IPT); frequency bifurcation; current-fed push-pull; resonant inverter; wireless power transfer
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Yu, A.; Zeng, X.; Xiong, D.; Tian, M.; Li, J. An Improved Autonomous Current-Fed Push-Pull Parallel-Resonant Inverter for Inductive Power Transfer System. Energies 2018, 11, 2653.

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