Abstract
The construction of an electromagnetic coupling power transfer system is introduced in this paper. Considering the characteristics of the battery charger, a novel parameter design method based on the load of the maximum power transfer point is proposed. Then, the compensator, resonant circuits, and some key parameters of the electromagnetic coupler are discussed in detail by constructing a mutual inductance model to carry out impedance calculation and analysis. Coupling coefficient influenced by different magnetic circuits and coil distribution were analyzed by building a finite element model and an equivalent magnetic circuit. Moreover, impedance matching and compensation network parameters were theoretically calculated and simulated. Finally, a wireless power charger based on an open-loop class E amplifier with the maximum power point load consideration was manufactured. Simulation and experiments were done to verify the analyses, and the capability of 4.2 W power delivery at a distance of 10 mm and a peak system efficiency exceeding 72% were demonstrated.
Highlights
In recent years, wireless power transfer (WPT), known as contactless power transfer, has aroused the wide concern of many experts and scholars for its safety and convenience
Electromagnetic coupling power transfer technology has been widely adopted in portable electronic equipment and subcutaneous implantable electronic devices because of its short power transmission distance
The maximum power delivery was 4.2 W and the peak efficiency was over 72%
Summary
Wireless power transfer (WPT), known as contactless power transfer, has aroused the wide concern of many experts and scholars for its safety and convenience. WPT technology has been adopted in the fields of wireless communication networks and the Internet of Things for energy collection [12,13] and transmission. Electromagnetic coupling power transfer technology has been widely adopted in portable electronic equipment and subcutaneous implantable electronic devices because of its short power transmission distance. In Reference [6], considering a class E amplifier circuit as the DC/AC (direct current/alternating current) inverter, with a distance of 10 mm between the transmitter coils and the receiver coils, the system had a maximum transmission power of 3.7 W and a peak efficiency of 66%. The effects of transmitter and receiver coils layout and core size of the coupler on coupling efficiency are discussed by analyzing the power delivery efficiency and constructing a magnetic circuit model of the coupler. Mutual Inductance Model of the Coupler that the system had a maximum transfer power of 4.2 W and a peak efficiency of more than 72% with an input voltage of 30 VDC (volts direct current) and a transfer distance of 10 mm
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