Design and Analysis of a Novel Wireless Electric Vehicle Battery Charging System Using Dual T‐Type Converter With High Efficiency and Bidirectional Capability

ABSTRACT Recently, numerous bidirectional wireless power transfer (WPT) systems with enhanced features for electric vehicle (EV) battery charging have been proposed. The converters in these WPT systems are generally configured with two synchronized full‐bridge–controlled converters operating at fixed duty cycle (two‐level operation) to enable WPT between the transmitter and receiver magnetic charge couplers. However, these require additional circuits to be employed in a wide range of load conditions, which lead to high costs and reduced power density. As a substitute, this article introduces a new wireless EV charging system using bidirectional dual T‐type converter (BDTC) configuration with PWM control. A wide range of load variations can be obtained without any additional circuits/switches with a proposed charging system based on a BDTC. Due to the reduced switching loss, reduced reactive circulating current, low cost, and increased efficiency, along with simple control, the proposed architecture offers significant advantages over traditional WPT systems. The proposed wireless EV charging system operates with series resonance in both directions. A mathematical model of the BDTC converter is developed, and the operating principle is detailed. Experimental results were acquired from the 3.3‐kW laboratory model, which exhibits nearly flat efficiency characteristics under various loading conditions; hence, the feasibility of the BDTC topology is validated.