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Technical Lecture

Resonant Converters

T17.4 - A 48V to 50-110V Resonant Power-Bus Charger with Reduced Conduction Loss for MHz-Frequency Long-Range LiDAR Driver

Wednesday, March 19, 2025
2:30 PM – 2:50 PM ET
Location: Level Three, A301
The paper presents a novel power-supply bus charger for Light Detection and Ranging (LiDAR) driver systems in automotive applications. The resonant charger employs a proposed synchronous boost converter topology that responds swiftly to rapid drops in the power bus voltage during periodic laser pulse emission. In contrast to conventional boost converter-based bus chargers, it eliminates hard-charging losses while maintaining robust output level regulation capabilities. This technique improves LiDAR driving efficiency across a wide supply bus range, ensuring the generation of high-amplitude and narrow-width pulses. Experimental results with a 48-V input confirm that the proposed design can regulate the output from 50V to 110V. When supplying a 100V bus, the charger attains a 250-ns bus recovery time while supporting a peak driving current of 49 A with 2-ns pulse-width for the laser diode, enabling LiDAR emission frequencies to exceed MHz-level. In addition, measured results demonstrate a significant reduction in overall system power consumption, from 14.1W to 6.3W, compared to the conventional approach.