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http://dx.doi.org/10.6113/JPE.2011.11.3.256

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

Li, Hao Leo (Dept. of Electrical and Computer Eng., University of the Auckland)
Hu, Aiguo Patrick (Dept. of Electrical and Computer Eng., University of the Auckland)
Covic, Grant Anthony (Dept. of Electrical and Computer Eng., University of the Auckland)
Publication Information
Journal of Power Electronics / v.11, no.3, 2011 , pp. 256-263 More about this Journal
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.
Keywords
Contactless power transfer; Energy injection control; Multiple pickups; Resonant inverter; Soft switching;
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