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

Anning Yu, Xiaoping Zeng, Dong Xiong, Mi Tian and Junbing Li
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Anning Yu: School of Microelectronics and Communication Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400044, China
Xiaoping Zeng: School of Microelectronics and Communication Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400044, China
Dong Xiong: School of Microelectronics and Communication Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400044, China
Mi Tian: School of Microelectronics and Communication Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400044, China
Junbing Li: School of Microelectronics and Communication Engineering, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing 400044, China

Energies, 2018, vol. 11, issue 10, 1-16

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.

Keywords: inductive power transfer (IPT); frequency bifurcation; current-fed push-pull; resonant inverter; wireless power transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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