Primary Current Generation for a Contactless Power Transfer System Using Free Oscillation and Energy Injection Control

Hao Leo Li; Aiguo Patrick Hu; Grant Anthony Covic

Primary Current Generation for a Contactless Power Transfer System Using Free Oscillation and Energy Injection Control

Hao Leo Li

Aiguo Patrick Hu

Grant Anthony Covic

Vol. 11, No. 3, pp. 256-263, May 2011

10.6113/JPE.2011.11.3.256

Contactless power transfer

Energy injection control

Multiple pickups

Resonant inverter

Soft switching

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Abstract

This paper utilizes free oscillation and energy injection principles to generate and control the high frequency current in the primary track of a contactless power transfer system. Here the primary power inverter maintains natural resonance while ensuring near constant current magnitude in the primary track as required for multiple independent loads. Such energy injection controllers exhibit low switching frequency and achieve ZCS (Zero Current Switching) by detecting the high frequency current, thus the switching stress, power losses and EMI of the inverter are low. An example full bridge topology is investigated for a contactless power transfer system with multiple pickups. Theoretical analysis, simulation and experimental results show that the proposed system has a fast and smooth start-up transient response. The output track current is fully controllable with a sufficiently good waveform for contactless power transfer applications.

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Cite this article

[IEEE Style]

H. L. Li, A. P. Hu, G. A. Covic, "Primary Current Generation for a Contactless Power Transfer System Using Free Oscillation and Energy Injection Control," Journal of Power Electronics, vol. 11, no. 3, pp. 256-263, 2011. DOI: 10.6113/JPE.2011.11.3.256.

[ACM Style]

Hao Leo Li, Aiguo Patrick Hu, and Grant Anthony Covic. 2011. Primary Current Generation for a Contactless Power Transfer System Using Free Oscillation and Energy Injection Control. Journal of Power Electronics, 11, 3, (2011), 256-263. DOI: 10.6113/JPE.2011.11.3.256.