Journal
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume 3, Issue 1, Pages 124-136Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2014.2336811
Keywords
Compensation topology; contactless power transmission (CPT); control strategy; input-to-output voltage gain; resonant power converter
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Funding
- Outstanding Doctoral Dissertation, Nanjing University of Aeronautics and Astronautics, Nanjing, China [BCXJ14-05]
- National Natural Science Foundation of China [51077069]
- Research Fund for the Doctoral Program of Higher Education of China [20103218110013]
- Hong Kong Research Grants Council General Research Fund [PolyU 5274/13E]
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Series/series (S/S) and series/parallel (S/P) compensations are widely used in contactless power transfer systems. However, the inductive input impedance of the S/S compensated converter operating at an output voltage gain intersection point impairs the system's efficiency, and the output voltage of the S/P compensated converter operating at resonant frequency is quite sensitive to variation of transformer's parameters caused by air gap change or misalignment. This paper proposes a novel series/series-parallel (S/SP) compensation topology to achieve both high efficiency and good output controllability. The frequency-domain and time-domain analyses of the proposed resonant converter are performed in this paper. Similar to the conventional resonant converters, both phase-locked-loop (PLL) control and fixed-frequency control can be employed. A 60-W prototype with PLL control and a 1.5-kW prototype with fixed-frequency control are built to verify the theoretical analysis. To perform the input-to-output voltage gain comparison, an S/P compensated converter is also fabricated. Experimental results verify the effectiveness of the proposed compensation method. The efficiency of the fabricated S/SP prototype reaches 95.2% at an output power of 1.5 kW with a 10-cm air gap between windings.
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