A Novel Rectifier Series Topology With High Efficiency for IPT System

Abstract

Inductive power transfer is widely used in electric vehicles and other applications. In order to improve the misalignment-tolerant characteristics of wireless charging, the receiver side often uses two mutually decoupled coils and two separate rectifiers in series or parallel. In the rectifier parallel topology, only the receiver coil with higher induced voltage operates, the receiver coils are less utilized. In the rectifier series topology, the dual receiver coils operate simultaneously, the rectifier diode conduction losses are high. This letter proposes a novel rectifier series topology with high efficiency, which also uses eight diodes, but only six diodes flow current in a cycle. In addition, the diode drop of the rectifier is reduced from four times to three times, the load output voltage is higher.