Interoperability study of wireless charging system with unipolar and bipolar coils based on capacitor–inductor–capacitor–capacitor–series​ topology

Abstract

Wireless charging for electric vehicles (EVs) enjoys advantages such as automation, safety, and convenience. For the most popular magnetic induction wireless power transfer (WPT) technology, different coupled coils are utilized such as the unipolar coil, the bipolar coil, and the quadruple coil. Thus, the interoperability of different coil types should be solved. Particularly, the transmitter should be interoperable with different receiving coil types, able to charge different EVs This paper proposes an interoperable solution for the two most popular coil types: the unipolar coil and the bipolar coil. The unipolar and bipolar coils are adopted on the transmitter side. Based on the transmitter-side capacitor–inductor–capacitor–capacitor (CLCC) compensation and the alteration of the switching pattern, when the receiving coil is a unipolar coil, the transmitter-side unipolar coil can work as the power transmission coil and the bipolar coil can work as the compensating inductor; when the receiving coil is a bipolar coil, the transmitter-side bipolar coil can work as the power transmission coil and the unipolar coil can work as the compensating inductor. In this way, the transmitter can be interoperable with the unipolar or bipolar receiving coil. The mathematical mode is built. A simulation model and an experimental prototype is established to validate the effectiveness of the proposal. The experimental results show that the interoperability of the receiver-side unipolar or bipolar coil can be achieved.

Keywords

• Wireless power transfer (WPT)
• Constant voltage (CV)
• Multiple outputs
• CLCC
• Decoupling