A multi-channel wireless charging system with constant-voltage outputs based on LCC-S topology and integrated magnetic design

Abstract

As an emerging technology, wireless power transfer (WPT) has various advantages, which can be enhanced by extending the WPT system into a multi-channel one. With the rapid development of electronic equipment, the demand for multiple independent voltage-source outputs is increasing. In many consumer electronics and industrial applications, voltage sources with multiple independent outputs are required. This paper proposes a wireless charging system with multiple constant-voltage (CV) outputs. The LCC-S (inductor capacitor capacitor-series) topology is adopted to achieve CV outputs. The output voltage can be regulated by the corresponding mutual inductance between the transmitting and receiving coils. The receiving coils are designed with overlapped areas to realize mutual decoupling, thus, each output voltage can be independent of each other. The compensating inductor is designed as a quadruple coil so that it can be integrated and decoupled with the transmitting coil at the same time, meanwhile, it can also be decoupled with the receiving coils. In this way, a multi-channel WPT system with independent CV outputs can be achieved. An experimental prototype with three CV output channels is implemented to validate the proposal. The experimental results have revealed that the three CV outputs can be stable with the load resistance variation in each channel.