Abstract
This paper presents a new zero voltage switching (ZVS) tuning method for the double-sided inductor/capacitor/capacitor (LCC) compensated wireless power transfer (WPT) system. An additional capacitor is added in the secondary side of the double-sided LCC compensation network in order to tune the network to realize ZVS operation for the primary-side switches. With the proposed tuning method, the turn off current of the primary-side switches at the low input voltage range can be reduced compared with the previous ZVS tuning method. Consequently, the efficiency of the WPT at the low input voltage range is improved. Moreover, the relationship between the input voltage and the output power is more linear than that of the previous ZVS tuning method. In addition, the proposed method has a lower start-up voltage. The analysis and validity of the proposed tuning method are verified by simulation and experimental results. A WPT system with up to 3.5 kW output power is built, and 95.9% overall peak efficiency is achieved.
Highlights
Wireless power transfer (WPT) technology can deliver electric power over certain distances without metal-to-metal contact by utilizing energy-contained fields [1,2]
The SP compensation circuit is mistuned because the primary compensated capacitance relates to the coupling coefficient [10], which means the resonant frequency is dependent on the coupling coefficient
SS compensation topology is superior to the other three compensation topologies because its resonant frequency is independent of the coupling coefficient and the load conditions [6]
Summary
Wireless power transfer (WPT) technology can deliver electric power over certain distances without metal-to-metal contact by utilizing energy-contained fields [1,2]. Its tuning method for realizing zero voltage switching (ZVS) is presented in [18]. The relationship between the input voltage and the output power is not so linear in the WPT system using the ZVS tuning method proposed by [18]. A new ZVS tuning method for double-sided LCC-compensated WPT system is proposed. An additional capacitor is added to the compensation topology in order to realize ZVS operation of the primary side switches. With the proposed ZVS tuning method, the resonant frequency of the resonant network is still irrelevant with the coupling coefficient and the load conditions.
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