An Inverter Topology for MultiTransmitter Wireless Power Transfer Systems

Abstract

This paper presents an inverter topology for a static wireless power transfer (SWPT) system that is intended to reduce the component counts and complexity of the conventional excitation circuit for multiple transmitter coils. The proposed inverter topology requires only (n+1) power switches, where ''n'' is the number of transmitter coils. The currents in the transmitter coils can be independently controlled. The output voltage is regulated through the transmitter-side control by adjusting the duty cycle of the inverter switches. A detection method of the receiver coil position is developed by comparing the transmitter currents to the predetermined transmitter coil patterns. The proposed detection method helps decide the proper transmitter selection, which improves the transfer efficiency throughout the operation. An experimental study is performed on the created 500-watt WPT multi-coil system. As the receiver coil is placed in the designated area, the proper transmitter coil pattern can be automatically selected and energized. The output voltage can be regulated to the desired values throughout the operation, regardless of the load condition.INDEX TERMS Inverter topology, multi-transmitter coil, transmitter-side control, output voltage regulation, receiver coil position detection, wireless power transfer.

A Comprehensive Review on Efficiency Enhancement of Wireless Charging System for the Electric Vehicles Applications

“…On the other hand, other compensation topologies such as parallel, LLC, and LCL topologies are more complex and have not yet been widely preferred. In [111][112][113] multi-transmitter based WPT system with SS compensation were analyzed and achieved the PTE of more than 90%. However, in all cases PTE is affected due to lateral misalignment, which need for in-search of better compensation topologies for multi-coil WPT system.…”

“…In this work author proposed an inverter with n+1 switches, not only which minimizing the switches also which have independent control over the excitation. This paper also presents new technique to excite the transmitter coil optimally by sensing and comparing the current circulating in the each coil [123].…”

“…Also, optimal selection of the transmitter for stimulation based on the alignment with the receiver coil adds extra complexity to the system. [116][117][118][119][120][121][122][123][124][125][126] In summary, this survey has shown that multi-transmitter based WPT systems are highly efficient, and primary sided LCC compensation is the preferred compensation technique. However, it is crucial to be aware of the limitations of the system, such as reduced efficiency in case of misalignment and the complexity of optimal transmitter selection.…”

Bifurcation Identification From Magnetic Flux Distribution by Using TMR Sensor-Based Wireless Power Transfer System

“…The wireless battery charging is based on the principle of wireless power transfer (WPT) system. The WPT techniques have been adopted in various applications such as home appliances [1], biomedical implants [2], [3], especially in EV charging applications [4]. However, the misalignment tolerance between receiving coil (mounted on the vehicle) and the transmitting coil (laid on the ground) is still a challenging problem for using wireless battery charging efficiently in EV charging situations.…”

Effective Circuit Configuration and Control for Coil-Array Wireless Power Transmitters

“…These configurations can be fabricated simply and costeffectively. On the other hand, the same number of inverters [12], [13] as that of the coils or a half-bridge inverter [14], [15], [16], [17], [18] with the same number of legs can be used. Only the transmitter coils close to the received coil are energized by the inverter, which leads to high-efficiency and low-magnetic-leakage operation.…”