Raju, SoniyaKularatna, NihalWilson, Marcus T.Steyn-Ross, D. Alistair2026-10-282026-10-282025Raju, S., Kularatna, N., Wilson, M., & Steyn-Ross, A. (2025). Supercapacitor based TMS pulse generator design-Experimental results versus Matlab MOSFET simulation model. The 2025 IEEE Applied Power Electronics Conference and Exposition (APEC) proceedings, 378-384. https://doi.org/10.1109/APEC48143.2025.10977152979-8-3315-1611-61048-2334https://hdl.handle.net/10289/18724Supercapacitors are ideal for short-term energy storage due to their high instantaneous power capability. Unlike traditional high-voltage DC power supplies typically used in transcranial magnetic stimulation (TMS) applications, a precharged supercapacitor module can serve as a cost-effective alternative for building a pulse generator with adjustable waveform capabilities. This approach utilizes a supercapacitor module with a capacitor bank rated at a few hundred farads and 10 V, combined with a step-up transformer-based converter and medium-voltage MOSFETs to meet TMS requirements. The output of this pulse generator, including the effects of varying gate voltages, can be accurately predicted using a robust model. This paper presents the design of a MOSFET model, incorporating a newly derived equation that effectively captures the subthreshold, near-threshold, and above-threshold regions of the MOSFET operation. Experimental results are provided and compared with Matlab model simulations, demonstrating the model's accuracy and effectiveness.enThis is an accepted version of a paper presented at the 2025 IEEE Applied Power Electronics Conference and Exposition (APEC). © 2025 IEEE.electrical stimulationmagnetic stimulationpulse circuitssupercapacitorstranscranial magnetic stimulation (TMS)Conference Contribution10.1109/APEC48143.2025.109771522470-664740 Engineering4008 Electrical Engineering4009 Electronics, Sensors and Digital Hardware7 Affordable and Clean Energy