Design, implementation issues and performance of an inductive power transfer system for electric vehicle chargers with series–series compensation

Abstract

The design, construction and evaluation of a contactless battery charger for electric vehicles (EVs) based on inductive power transfer (IPT) is presented in this study. The design of such systems entails a high degree of complexity because of the large number of design parameters involved and, consequently, trade-offs in selecting the key design parameters have to be established. The design process and selection of the IPT system parameters is detailed in this study, considering the most common specifications of EV chargers and the practical issues of the implementation. Regarding the compensation scheme, which is one of the main issues in the design, series compensation in both the primary and secondary has been adopted because of the advantages identified after a comprehensive analysis. A laboratory prototype has been built and tested, providing extensive results of the system performance in terms of efficiency and power transfer capability, considering load power variations, as well as changes in the air gap between coils. A detailed analysis of the efficiency of each stage in the IPT system and their contribution to the overall efficiency is also provided.

Development of Design Methodology for 60Hz Wireless Power Transmission System

“…Three modes of connection were performed; the primary C 1 and secondary C 2 condensers were connected in parallel with the respective coils (PP mode), C 1 was connected in parallel while C 2 was connected in series (PS mode), and C 1 and C 2 were both connected in series (SS mode) (27) . The equivalent circuit analysis process for the PP mode is given here, and a similar process was applied for the other modes.…”

Investigation of a SP/S Resonant Compensation Network Based IPT System with Optimized Circular Pads for Electric Vehicles

“…The designs using pot cores, U-shape cores or E-cores are necessarily thick, which is a problem when it comes to chasis requirements [5], [17], [18], [21], [22]. In order to solve this problem, some new magnetic structures have been presented in [1], [2], [9]- [12], [23], [24]. Two classical pad designs are commonly used in IPT systems.…”

“…The high frequency alternating current in the transmitting coil generates an alternating magnetic field, which induces an AC voltage on the receiving coil. Finally, AC power is rectified to charge the batteries in EVs [1], [2], [9], [10].…”

“…In practical applications, the quality factor Q 2 is constrained below 6 [9], [10], [12], and if ω and I 1 are constant [9], [13], [16] it can be derived from Eq. (1) that P out will only be dependent on M 2 /L 2 .…”

“…It is required to use a resonant compensation network before the transmitting pad to reduce the VA rating [1], [3], [4], [9]. Four basic resonant topologies: series-series (SS), series-parallel (SP), parallel-series (PS), and parallel-parallel (PP) are widely known [1], [7], [9], [23], [24]. For the transmitting side, S and P resonant compensation networks are in common use.…”