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.

中文翻译：

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基于中继器线圈的无线电力传输系统，为串联的IGBT的多个栅极驱动器供电

在高压应用中，为大量串联连接的绝缘栅双极型晶体管（IGBT）的栅极驱动器供电是一项挑战，因为需要多个隔离电源。在这项研究中，设计了一种使用中继器线圈的新型无线功率传输（WPT）系统来解决此问题。每两个转发器线圈组成一个转发器单元，该转发器将功率传输到一个负载。在系统中有多个转发器单元的情况下，多个负载可以同时获取功率。为了消除这些线圈之间不希望的磁耦合，使用了双极线圈，并且在同一中继器单元中的两个双极线圈垂直放置。可以得出的是，所有负载均可获得恒定电压，这特别适合为IGBT的栅极驱动器供电。此外，一个负载功率的变化不会影响其他负载功率。接收电路设计为将接收到的功率转换为与驱动电路兼容的直流电压。已经构建了具有六个负载的实验装置，以验证所提出的WPT系统。