Development Trend of Inductive Power Transfer Systems with Focus on Transmission Frequency and Transmission Power

Abstract

In recent years, inductive power transfer (IPT) systems have been actively studied. This paper describes the development trend of inductive power transfer systems since the 1970s, focusing on the transmission frequency, transmission power, and the coupling coefficient, on the basis of a survey of papers published by IEEJ and IEEE. The transmission power shows close correlation with the transmission frequency. By contrast, the coupling coefficient does not show correlation with either the transmission frequency or the transmission power.

Efficiency improvement of high‐frequency inverter for wireless power transfer system using series compensator

“…A system configuration of WPT for EV is shown in Figure . Recently, 85‐kHz band was selected in SAE publication, and power transfer is performed at a frequency of several ten kilohertz in many cases . Therefore, power converters are needed on the primary and secondary sides; in order to improve efficiency of the entire system, one must consider not only efficiency of power transfer between coils, but also efficiency of both converters.…”

“…Therefore, power converters are needed on the primary and secondary sides; in order to improve efficiency of the entire system, one must consider not only efficiency of power transfer between coils, but also efficiency of both converters. A DC/AC inverter producing high‐frequency current preceded with a DC/DC converter for output regulation is used as the primary power converter . The primary DC/AC inverter is operated at a high switching frequency; therefore, switching loss cannot be ignored, and reducing the loss is important to improve the system's efficiency.…”

Efficiency Improvement of High Frequency Inverter for Wireless Power Transfer System Using Series Compensator

“…2,3 Recently, 85-kHz band was selected in SAE publication, and power transfer is performed at a frequency of several ten kilohertz in many cases. 4,5 Therefore, power converters are needed on the primary and secondary sides; in order to improve efficiency of the entire system, one must consider not only efficiency of power transfer between coils, but also efficiency of both converters. A DC/AC inverter producing high-frequency current preceded with a DC/DC converter for output regulation is used as the primary power converter.…”

“…A DC/AC inverter producing high-frequency current preceded with a DC/DC converter for output regulation is used as the primary power converter. 4,6 The primary DC/AC inverter is operated at a high switching frequency; therefore, switching loss cannot be ignored, and reducing the loss is important to improve the system's efficiency. In this paper, we focus on reducing switching loss of the primary DC/AC inverter in wireless power supply systems.…”