Abstract
Wireless power transfer (WPT) is gaining much attention for battery charging of electric vehicles (EVs). Resonant WPT systems play a crucial role in achieving efficient power transfer from source to load. An overview of two-element resonant compensation techniques and their characteristics under various operating conditions are presented. Also the converter and control strategies used for different topologies are reviewed. The behavior of the performance factors are evaluated against the operating conditions and compared for the different topologies.
Highlights
Wireless power transfer (WPT) is gaining much attention for battery charging of electric vehicles (EVs)
Wireless power transfer systems (WPTSs) are expected to play a major role in future EV charging equipment [6,7]
The grid feeds the relevant coil through a capacitor-output diode rectifier and an in-cascade inverter operating at high frequency
Summary
Wireless power transfer systems (WPTSs) transfer power from supply (grid) to load without any galvanic connection [1,2,3,4,5]. It consists mainly of two sections: transmitting (or primary) and receiving (or secondary), each of them includes a coil that is coupled to the other one with a large air-gap in between. The major concern of a WPTS is an air gap between the coupling coils, which leads to large leakage inductance and small mutual inductance This results in a large primary current requirement in order to transfer given amount of power [16]. For charging application where there is only one receiving coil coupled to the transmitting coil, it is better to use primary side control This eliminates the additional DC-DC converter stage but has a simple rectifier and filter [73].
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