TY - JOUR

T1 - Wireless Low-Power Transfer for Galvanically Isolated High-Voltage Applications

AU - Hitzemann, Moritz

AU - Lippmann, Martin

AU - Trachte, Jonas

AU - Nitschke, Alexander

AU - Burckhardt, Olaf

AU - Zimmermann, Stefan

N1 - Funding Information: Funding: Supported by the German Federal Ministry of Education and Research (BMBF) under the Grant 13N14888. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—396430937. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—263334553. Acknowledgments: We thank Christian-Robert Raddatz, Nic Solle and Eduard Sailer for their help during this work. We want to acknowledge Cameron Naylor for his advice during editing.

PY - 2022/3/16

Y1 - 2022/3/16

N2 - 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 × 10 cm × 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%.

AB - 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 × 10 cm × 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%.

KW - DC/DC converter

KW - DCDC converter

KW - Gallium nitride GaN transistor

KW - High voltage isolation

KW - PCB coils

KW - PCB transformer

KW - Power transformer

UR - http://www.scopus.com/inward/record.url?scp=85126722237&partnerID=8YFLogxK

U2 - 10.3390/electronics11060923

DO - 10.3390/electronics11060923

M3 - Article

AN - SCOPUS:85126722237

VL - 11

JO - Electronics (Switzerland)

JF - Electronics (Switzerland)

SN - 2079-9292

IS - 6

M1 - 923

ER -