Control Design for Optimizing Efficiency in Inductive Power Transfer Systems

Inductive power transfer (IPT) converters are resonant converters that attain optimal energy efficiencies for a certain load range. To achieve maximum efficiency, it is common to cascade the IPT converter with front-side and load-side dc/dc converters. The two dc/dc converters are normally controlle...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2018-05, Vol.33 (5), p.4523-4534
Main Authors: Huang, Zhicong, Wong, Siu-Chung, Tse, Chi K.
Format: Article
Language:English
Subjects:
Control
Control for maximum efficiency
Couplers
Couplings
Design optimization
Electric converters
Energy conversion efficiency
Impedance matching
inductive power transfer (IPT)
Inverters
Load modeling
Magnetic circuits
Modulation
Power transfer
Tracking control
Transfer functions
Voltage control
Voltage converters (DC to DC)
wireless power transfer
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Summary:Inductive power transfer (IPT) converters are resonant converters that attain optimal energy efficiencies for a certain load range. To achieve maximum efficiency, it is common to cascade the IPT converter with front-side and load-side dc/dc converters. The two dc/dc converters are normally controlled cooperatively for the requirements of output regulation and maximum efficiency tracking using a control technique based on perturbation and observation, which is inevitably slow in response. In this paper, a decoupled control technique is developed. The load-side dc/dc converter is solely responsible for output regulation, while the front-side converter is responsible for impedance-matching of the IPT converter by controlling its input-to-output voltage ratio. The controls are linear and therefore fast. DC and small-signal transfer functions are derived for designing the control parameters. The performances of fast regulation and high efficiency of the IPT converter system are verified using a prototype system.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2724039