A Three-Coil Inductively Power Transfer System with Constant Voltage Output

Ruikun Mai, Youyuan Zhang, Ruimin Dai, Yang Chen and Zhengyou He
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Ruikun Mai: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Youyuan Zhang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Ruimin Dai: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Yang Chen: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Zhengyou He: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Energies, 2018, vol. 11, issue 3, 1-13

Abstract: For a traditional 2-coil system outputting constant voltage (CV), the transfer efficiency decreases drastically as transfer distance increases. To solve this problem, this essay proposes a 3-coil system which could achieve CV output and Zero Phase Angle (ZPA) conditions with specific parameter values. This 3-coil system could partly relief transfer efficiency fall at a long transfer distance, without any complicated controls. In order to achieve CV and ZPA condition, this essay devises the parameter values based on the decoupling 3-coil model, and a prototype is designed accordingly to verify these characteristics. With 10 cm transfer distance, output voltage deviation is 5.5% as the load varies from 12 Ω to 200 Ω, proving that the output voltage almost keeps constant with load change. Furthermore, with software simulation, a comparison experiment between the proposed 3-coil system and a Series-Inductor-Capacitor-Inductor (S-LCL) compensated 2-coil system is built to verify the efficiency improvement. The transfer distance change leads to the differentiation of voltage gain for both 2-coil and 3-coil systems. So, the input voltage for both systems and the compensated capacitor in receiver loop of the 3-coil system are manipulated for keeping 60 V output voltage on the 12 Ω load. With distance increasing from 10 cm to 20 cm, transfer efficiency varies from 92.61 to 48.9% for the 2-coil system, and from 92.89 to 84.26% for the 3-coil system, effectively proving the efficiency improvement. The experiment and simulation results prove the effectiveness of the proposed method.

Keywords: relay coil; constant voltage; transfer efficiency; inductive power transfer (IPT) (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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