Power Control and Efficiency Enhancement Topology for Dual Receiver Wireless Power Transfer EV Quasi-Dynamic Charging

A Quasi-Dynamic Wireless Inductive Power Transfer (QDWIPT) system for Electric Vehicle (EV) charging applications, benefits from user-friendly charging with reduced charging duration and limited battery capacity for long-distance travel. This article proposes the Dual receiver power control and Power Transfer Efficiency (PTE) enhancement topology for the QDWIPT system. This topology inculcates; a half-active bridge rectifier for Dual pickup Receiver (Rx) coils and battery charging power controlled by a DC-DC converter in the secondary unit. The power controller design and control strategies are based on dual receiver topology and the DC-DC chopper model for an effective battery charging process. The dual pick-up decoupled feature coils are placed at optimal distance, with a resonant compensator to minimize the cross-coupling effect in the wireless coupling region. The half-active rectifiers maximize the transmitting efficiency of the dual receiver coil topology with the power control method. This proposed QDWIPT topology is experimentally investigated for a 3.3 kW prototype and power-controlled battery charging is discussed in this article.

I. Introduction

Nowadays, Electric vehicles (EVs) are the most demanded and latest trending research area among researchers. The EV research is for various applications, the electric motor in the EV has several types are the conventional options for the IC engine drive [1]. The EV benefits the environment and ecosystem in several aspects, on the other hand, it has several issues mainly limited travel range due to limited storage battery, required large battery charging time, and the cost of the storage unit is higher. Also, the EV market is affected due to its cost and charging infrastructure [2]. Also, the EV in a real-time application will impact more electrical energy utilization and benefits by using renewable energy sources for efficient EV charging infrastructure [3]. The Plugin charging system has huge drawbacks [4]. The WIPT system is the combination of primary and secondary systems or a combination of On-Board and Off-Board systems. The quasi -dynamic WIPT system benefits EV charging in static and also in slow-moving states. Quasi-Dynamic Wireless Inductive Power Transfer (QDWIPT) can address the lag in the charging infrastructure challenge in the EV market, it energizes the EV in quasi-motion, which results in increases in the distance traveled by the EV and reduce the size and capacity of the battery pack [5]. The DC fast charging of EV benefits the EV charging duration and bulk power transfer, and various high gain DC-DC topology is investigated for EV charging application comparatively [6]. The power transfer control strategy of the in-motion charging system is more complicated than static charging systems. To reduce the complex control mechanism double-sided control technique [7]. The receiver (Rx) side control signal is considered to be a transmitter (Tx) side power control by enabling the wireless communication protocol [8]. Due to a delay in signal communication for the in-motion application, it's better to prefer secondary side control for effective battery charging. From the literature, the receiver side control is investigated to power flow control and enhance efficiency [9], [10]. The power flow control and efficiency are simultaneously controlled using dual receiver converters [11]. This control strategy integrates the role of the rectifier (AC-DC) by using the half-active rectifier and the DC-DC chopper module. The half-active rectifier controls the transmitting power and the DC-DC chopper maximizes the efficiency of battery charging. However, the battery charging power cannot be controlled directly in this type of topology.