Webinar: Chip-Scale High-Voltage Power Supplies

This talk covers research on miniaturized power supplies using high-voltage IC technologies from
110/230V mains or 400V DC sources to power low-voltage subsystems. It explores system and circuit
solutions for chip-scale power supplies, enhancing miniaturization and decentralization of complex
systems, applicable to sensor nodes, transmitters, receivers, and actuators with 3-10V supply voltages at
or below 500mW.
Highlighted are various miniaturized high-voltage converters, including active-clamp flyback and buck
converters. An innovative voltage-interval-based constant-on-time control for buck converters supports
12.5-400 V input, achieving a power density of 752 mW/cm³ and 84% peak efficiency. A high-speed, low-
power HV threshold-detection circuit significantly reduces sensing losses.
The AC-DC converter features an active zero-crossing buffer, minimizing capacitance by 240x and
enabling integration up to 50 mW with a power density of 458 mW/cm³ and 73.7% AC peak efficiency.
Monolithic GaN integration supports designs like a 55W PFC converter and a 15W offline buck converter.
A fully integrated GaN power stage operating at 500V and up to 6.25MHz will also be presented.
Speaker(s): Bernhard Wicht
Virtual: https://events.vtools.ieee.org/m/555593