A Half-Bridge-Based Inverter Topology for Multi-Transmitter Coil Wireless Power Transfer System
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Abstract
This paper presents a half-bridge–based inverter topology for multi-transmitter wireless power transfer (WPT) systems. The proposed topology reduces the number of power switches compared with conventional full-bridge multi-transmitter systems while allowing independent control of each transmitter coil using a shared DC power source. An analytical model of the multi-transmitter WPT system is developed and simplified into an equivalent two-coil model to analyze output power and transfer efficiency. The operating modes of the inverter and a hierarchical transmitter-side control scheme with outer voltage and inner current control loops are presented to regulate output voltage and control individual transmitter coil currents. The proposed system is experimentally validated using a prototype operating at 67 kHz. Experimental results demonstrate stable inverter operation, effective voltage regulation under load variation, good dynamic response under step load changes, and improved transfer efficiency under receiver coil displacement compared with a conventional single-transmitter system. The results confirm that the proposed inverter topology reduces system complexity while improving misalignment tolerance and extending the effective operating area of multi-transmitter wireless power transfer systems.
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