Abstract

This paper presents a thermal investigation of lightweight on-board receiver modules of wireless power transfer systems for electric vehicles. The studied modules are capable of receiving up to 11 kW at a resonance frequency of 85 kHz over a distance of 110–160 mm. The receiver modules were built as sandwich and space–frame concept to design stiff and lightweight structures. The high transmission power of automotive wireless power transfer systems combined with the multi-part assembly of receiver modules led to challenges in heat management. To address this, the physical behaviour of the proposed lightweight concepts were studied on component and system level using a hardware-in-the-loop testing facility for wireless power transfer systems. Special emphasis was laid on the validation of a thermal simulation model, which uses analytical calculated power losses taking into account their temperature dependency. The proposed simulation model is consistent with the experimental validation of the critical active components. The performed systematic studies build the basis for a more sophisticated thermal dimensioning of various constructions for wireless power transfer modules.

Highlights

  • Wireless power transfer systems (WPTS) are considered as key factors in increasing the acceptance of electric vehicles (EVs) [1,2]

  • Component level testing: Figure 12 summarizes the results of the thermal investigation of the sandwich concept, taking into account the electric requirements of component level testing (ICPM = 33 A) and natural convection

  • This paper presents a systematic investigation of thermal effects of novel on-board receiver modules for vehicular wireless power transfer systems

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Summary

Introduction

Wireless power transfer systems (WPTS) are considered as key factors in increasing the acceptance of electric vehicles (EVs) [1,2]. Wireless charging provides power transfer without user intervention. This results in an increase of comfort and safety by eliminating cable handling. The GPM usually consists of four main elements: a rectifier circuit, an inverter, a matching network including a capacitor and a transmitter coil. The HF-AC drives the series resonant tank, composed of a matching networks including a resonance capacitor CGPM and a transmitter coil LGPM. The CPM usually is built of a series or parallel resonant tank, consisting of a receiver coil LCPM and a matching network including a resonance capacitor CCPM , a rectifier and if necessary a DC/DC converter.

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