Design Procedure Based on Maximum Efficiency for Wireless Power Transfer Battery Chargers with Lightweight Vehicle Assembly

Mattia Simonazzi,Alessandro Campanini,Leonardo Sandrolini,Claudio Rossi

doi:10.3390/en15010070

Abstract

This paper analyzes two different design procedures for a series-parallel compensated WPT battery charger, based on different definitions of the operating resonant frequency in the condition of maximum link efficiency. The behaviour of the voltage gain magnitude and the input impedance angle of the resulting WPT links is studied for different loads and coupling coefficients. The design algorithms are supported by analytical formulas derived from an exact circuit analysis of the WPT link, avoiding approximations as far as possible. To support the theoretical approach a case study is proposed, in which both design procedures are implemented considering specifications in line with the actual automotive standards. To conclude, a characterization of the efficiency in both cases is derived.

Highlights

Nowadays, environmental issues and technological improvements have pushed towards the direction of investing in electric mobility
The off-board layout mounted on the ground assembly (GA) starts from the rectified DC bus voltage, VDC, which is provided by the AC/DC stage
This paper aims at providing a general design procedure, including the coil design, based on maximizing the tank efficiency and minimizing the vehicle assembly (VA) self-inductance, considering the SP compensation network topology for automotive battery charging applications

Summary

Introduction

Environmental issues and technological improvements have pushed towards the direction of investing in electric mobility. Dangerous limitations of on-board chargers (OBCs) refer to safety of operation, reliability and need to manually connect the car to a charging station. To overcome these limitations, Wireless Power Transfer (WPT) systems have become an hot-spot to be further analyzed [1,2,3]. The off-board layout mounted on the ground assembly (GA) starts from the rectified DC bus voltage, VDC, which is provided by the AC/DC stage. It goes through the full-bridge inverter, that feeds the primary resonant tank, up to the primary transmitter coil.

Objectives

Methods

Conclusion