access icon free Repeater coil-based wireless power transfer system powering multiple gate drivers of series-connected IGBTs

© The Institution of Engineering and Technology
Received 21/08/2019, Accepted 25/02/2020, Revised 15/02/2020, Published 26/02/2020

It is challenging to power a large number of gate drivers of the series-connected insulated gate bipolar transistors (IGBTs) in a high-voltage application because multiple isolated power supplies are needed. In this study, a novel wireless power transfer (WPT) system using repeater coils is designed to solve this problem. Every two repeater coils form a repeater unit, which transfers power to one load. With multiple repeater units in the system, multiple loads can obtain power simultaneously. To eliminate undesirable magnetic couplings between these coils, bipolar coils are used and the two bipolar coils in the same repeater unit are placed perpendicularly. It is derived that constant voltage can be obtained for all the loads, which is especially suitable for powering the IGBT's gate driver. Moreover, the variation of one load power will not affect others. The receiving circuit is designed to transform the received power to the DC voltage compatible with the driving circuits. An experimental setup with six loads has been constructed to validate the proposed WPT system.

Inspec keywords: driver circuits; integrated circuit design; coils; inductive power transmission; repeaters; insulated gate bipolar transistors

Other keywords: magnetic coupling; IGBT gate driver; series-connected IGBT; multiple isolated power supplies; bipolar coils; series-connected insulated gate bipolar transistors; receiving circuit design; repeater coil-based wireless power transfer system; repeater coils; multiple repeater units

Subjects: Inductors and transformers; Power convertors and power supplies to apparatus; Bipolar transistors; Power electronics, supply and supervisory circuits; Insulated gate field effect transistors; Wireless power transmission; Semiconductor device modelling, equivalent circuits, design and testing; Electromagnetic induction

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