A novel wireless power charging system for electric bike application

In this paper a novel wireless power charging system is proposed. A bridgeless SEPIC circuit working at the discontinuous mode is adopted as the front AC-DC power factor correction (PFC) stage. A LCC-S compensation network is used to compensate the leakage inductance of the sending and receiving coils. The SEPIC PFC circuit has a constant ac power characteristic at a fixed duty ratio. And the LCC-S compensation network makes the intermedia dc bus voltage and output battery voltage a fixed relation. By combining the SEPIC and LCC-S, the proposed wireless charging system can eliminate the use of electrolytic capacitor. Also, the charging power can be controlled just by adjusting the duty ratio of SEPIC converter. These make the proposed system especially suitable in several hundred watts applications, like the electric bike wireless charging. The analysis of the proposed system, system design and implement, and preliminary experimental results are given in the paper.

I. Introduction

In recent years, with the rapid development of the wireless power charging technologies, it has been applied in mobile phones, MP3, camera and other similar handheld devices. The most significant problem that we should solve is how to guarantee high efficiency when charging. But what we cannot neglect is the prospect of the application is getting better, as the technology developed. For example, this technology has gradually used in the electric vehicles.