Analysis, Design, and Validation of a Dual-Channel High-Power WPT System Based on Bilateral Coil Decoupling

In some practical applications, such as electric vehicles (EVs) and electric buses (EBs), high-power wireless charging systems are required. However, existing high-power wireless charging systems have problems such as low power of semiconductor devices, low space utilization, interference from additional cross-coupling, and complex circuit design. To solve the above problems, a dual-channel high-power WPT system based on bilateral coil decoupling is proposed in this article. The transmitter DD coil is stacked horizontally on the ferrite, and the transmitter solenoid coil is nested and wrapped around the DD coil and ferrite to form the transmitter charging pad. The receiver charging pad adopts the same structure as the transmitter charging pad. The two charging pads are placed coaxially opposite each other to form the magnetic coupler. In the proposed magnetic coupler, the DD coil and the nested wound solenoid coil are naturally decoupled. Therefore, the proposed system eliminates additional cross-coupling, simplifies the system design, and increases the system’s transmission power while maintaining compactness. First, the decoupling principle of the proposed magnetic coupler is analyzed in detail. Second, the principle of the proposed dual-channel WPT system is derived, and the output power is compared with the ordinary single-channel WPT system. Finally, a verification experimental prototype with a rated power of 360 W is built, and the test results are consistent with the theoretical analysis.