Design of an LED Sink Driver Using a Switched-Inductor and Switched-Capacitor Buck-Boost Converter with High Voltage Gains

• Published in: 2020 2nd International Conference on Smart Power & Internet Energy Systems (SPIES) pp. 33 - 38
• Main Authors: Eguchi, Kei, Shibata, Akira, Asadi, Farzin, Ishibashi, Takaaki, Harada, Yujiro, Oota, Ichirou
• Format: Conference Proceeding
• Language: English
• Published: IEEE 15-09-2020
• Subjects: buck-boost converters; High-voltage techniques; hybrid dc/dc converters; Integrated circuit modeling; LED lighting applications; Light emitting diodes; Lighting; SPICE; switched capacitor circuits; switched inductor circuits; Switches; Topology
• DOI: 10.1109/SPIES48661.2020.9243052

A novel light emitting diode (LED) sink driver using a switched-inductor and switched capacitor (SISC) buck-boost converter is proposed in this paper. The proposed LED driver can achieve a high voltage gain by cascading the SI buck-boost block and the SC doubler block with a flying capacitor. The proposed negative SISC topology can provide not only high voltage gain but also flexible controllability of LED currents. The performance of the proposed SISC buck-boost converter was clarified by simulation program with integrated circuit emphasis (SPICE) simulations. In the performed simulations, the proposed SISC buck-boost converter can improve power efficiency about 6% from the conventional hybrid buck-boost converter when the duty factor D is 0.5 and the output power is 500mW. Furthermore, the feasibility of the proposed SISC topology was confirmed by breadboard experiments.