Wireless Low-Power Transfer for Galvanically Isolated High-Voltage Applications
Wireless Low-Power Transfer for Galvanically Isolated High-Voltage Applications
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DOI：
10.3390/electronics11060923
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发表时间：
2022-03-01
期刊：
影响因子：
2.9
通讯作者：
Zimmermann, Stefan
中科院分区：
文献类型：
--
作者：
Hitzemann, Moritz;Lippmann, Martin;Zimmermann, Stefan
对于各种应用，例如晶体管的栅极驱动器、移动的设备和汽车的无线充电器以及隔离测量设备，需要为电子元件提供隔离直流电源。在这项工作中，提出了一个新的概念，隔离电源的绝缘强度为50 kV和功率传输高达60 W，提供测量设备与12或24 V。此外，在55 W时实现了82.5%的高总效率。在一个真实的应用中证明了在高参考电位下为数据采集电子器件供电的可行性。我们的新概念采用无芯印刷电路板（PCB）Transformer（15 cm x 10 cm x 4 cm，重量480 g），通过线圈布局和PCB上相邻线圈的紧密靠近实现最大效率，同时通过PCB材料和封装线圈实现高隔离强度。为了提高效率，我们研究了不同频率下的不同线圈几何形状。将由安装在一个PCB上的两个Qi充电线圈组成的低成本设计与我们的集成PCB变压器进行了比较，该变压器由外部应用铁氧体的四层PCB制造。采用这种新设计，可以实现高隔离电压，同时达到高达90%的高Transformer效率。
For various applications, such as gate drivers for transistors, wireless chargers for mobile devices and cars, and isolated measurement equipment, an isolated DC power supply for electronic components is required. In this work, a new concept for an isolated power supply with insulation strength of 50 kV and power transmission of up to 60 W to supply measurement equipment with 12 or 24 V is presented. Furthermore, high overall efficiency of 82.5% at 55 W is achieved. Feasibility is demonstrated in a real application powering data acquisition electronics at high reference potential. Our new concept uses a coreless printed circuit board (PCB) transformer (15 cm x 10 cm x 4 cm and a weight of 480 g) designed for maximum efficiency via a coil layout and close proximity of adjacent coils on one PCB while reaching high isolation strength via the PCB material and potted coils. To increase efficiency, we investigated different coil geometries at different frequencies. A low-cost design consisting of two Qi charging coils mounted on one PCB is compared with our integrated PCB transformers manufactured from a four-layer PCB with ferrites applied on the outside. With this new design, high isolation voltages are possible while reaching high transformer efficiency of up to 90%.