Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 58, Issue 1, Pages 1053-1060Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2021.3089448
Keywords
Couplers; Switches; Reactive power; Metals; Battery chargers; Impedance; Couplings; Capacitive power transfer; LCLC-LC compensation; load-independent outputs; soft switching; unity power factor
Funding
- National Natural Science Foundation of China [52077038]
- Natural Science Foundation of Jiangsu Province [BK20181280]
- Fundamental Research Funds for Central Universities of China
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This article introduces an LCLC-LC compensated CPT charger, which can achieve an efficient charging profile while maintaining nearly unity power factor and soft switching characteristics. The design principle and sensitivity analysis of the CPT charger are discussed, and an experimental prototype is built to verify the analysis.
Capacitive power transfer (CPT) techniques are attracting widespread attention due to some unique advantages compared to conventional plug-in systems and inductive power transfer techniques. Since Lithium-ion batteries have been widely used in many energy storage applications, a well-compensated CPT charger should provide an efficient charging profile consisting of first constant current (CC) and later constant voltage (CV), while maintaining nearly unity power factor and soft switching of power switches simultaneously. However, many CPT systems can only realize either CC output or CV output with the input zero-phase angle. Thus, a high-performance CPT charger should possess at least one CC frequency and one CV frequency to charge the battery from CC mode to CV mode by simply switching the operating frequency. In this article, an LCLC-LC-compensated CPT charger is systematically analyzed to achieve these characteristics. Design principle of the CPT charger is also derived with arbitrarily given coupler and configurable charging profile, proving enough design freedom. Besides, the sensitivities of input impedance, output current, and output voltage to variations of compensation parameters are also discussed to realize soft switching. Finally, an LCLC-LC-based CPT prototype with 48 V/2 A charging capability is built to verify the analysis.
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