A new receiver-side integrated regulator with phase shift control strategy for wireless power transfer system

Abstract

In the receiver-side of wireless power transfer (WPT) system, the two power stages such as rectifier and battery control converter have been widely used due to its easy implementation. However, since the two power stages cause many number of components on the conduction path, it degrades the efficiency and power density of WPT system. Also, in the WPT system, because the communication control between transmitter and receiver side have to be used due to its physical contactless structure, the transmitter-side cannot effectively control receiver-side rectifier outputs. To relieve these drawbacks, this paper proposes a new receiver-side integrated regulator. The proposed structure is based on the general full-wave rectifier diode structure, and a single-switch is integrated for output voltage regulation with phase-shift control strategy. The proposed structure can reduce the number of components on the conduction path, resulting in high power density. Moreover, the proposed method can remove communication control with stable receiver-side outputs. Theoretical analysis and simulation results verify that the proposed structure and control method enables stable output voltage regulation without communication control between transmitter and receiver side. The effectiveness of the proposed structure and control method is verified by a prototype with input 380VDC and 150W output.