Compact Converters Using GaN HEMTs for Isolated RF Power Applications

Dr. Harish Krishnamoorthy, Assoc Prof. at University of Houston presents at the 2024 ATCx Electronics conference.

Pulsed power applications require the delivery of high-energy pulses in a controlled and efficient manner. Power converters need to be specifically designed to meet the demanding requirements of pulsed power systems, providing precise voltage and current regulation, fast switching capabilities, and high power density. Power supplies for pulsed power applications contribute to the advancement of various fields, including aerospace, defense, medical, and subsurface characterization.

This talk will begin with the introduction of major pulsed power applications and then focus on two of the critical ones – radar and nuclear magnetic resonance (NMR) spectroscopy, both RF applications – from a power conversion perspective. Then, the speaker will detail a 2-stage converter architecture and the design of the individual stages (isolated and non-isolated) using GaN HEMTs for these applications. This will be followed by a description of the challenges faced while designing compact (~100 W/in3), fast (<1 µs load transients), and high-temperature (>150 oC) capable pulsed power supplies. The talk will further discuss simulation results performed using PSIM software and also experimental results on a hardware prototype.