ScholarWorks@중앙대학교

초록

This article presents a voltage-stacked energy-recycling switched-capacitor (ERSC) boost converter for biasing single-photon avalanche diodes (SPADs) used in LiDAR systems. The boost converter used in such systems must maintain high efficiency while providing a wide output voltage range to cover the wide system dynamic range and the temperature-sensitive variation of the SPADs breakdown voltage. To these challenges using a single 5V input supply, the proposed converter employs a 1/2x ERSC stage to reduce the effective dropout voltage of the linear voltage regulator (LVR) while recycling the residual energy back to the input, thereby improving overall efficiency and extending the achievable output voltage range. In addition, an advanced continuous pole-tracking compensation technique is introduced to maintain a stable phase margin across wide output voltage and load current ranges. Measurement results show that the fabricated prototype achieves an output voltage range of 14-19 V, corresponding to a voltage conversion ratio of 2.8–3.8x. The converter attains a peak efficiency of 95%, output voltage recovery times of 240 ns and 280 ns for 220 mA load step-up and step-down events, respectively, and a maximum steady-state output ripple of 10 mV.

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