Miniature DC-DC Boost Converter for Driving Display Panel of Notebook Computer

Seok-Hyeong Ham and Hyung-Jin Choe
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Seok-Hyeong Ham: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Kyungpook 37673, Korea
Hyung-Jin Choe: Department of Electrical Engineering, Tongmyong University, 428 Sinseon-ro, Nam-gu, Busan 48520, Korea

Energies, 2019, vol. 12, issue 15, 1-13

Abstract: This paper proposes a miniature DC-DC boost converter to drive the display panel of a notebook computer. To reduce the size of the circuit, the converter was designed to operate at a switching frequency of 1 MHz. The power conversion efficiency improved using a passive snubber circuit that consisted of one inductor, two capacitors, and two diodes; it reduced the switching losses by lowering the voltage stress of the switch and increased the voltage gain using charge pumping operations. An experimental converter was fabricated at 2.5 cm × 1 cm size using small components, and tested at input voltage 5 V ≤ V IN ≤ 17.5 V and output current 30 mA ≤ I O ≤ 150 mA. Compared to existing boost converters, the proposed converter had ~7.8% higher power conversion efficiency over the entire range of V IN and I O , only ~50% as much voltage stress of the switch and diodes, and a much lower switch temperature T SW = 49.5 °C. These results indicate that the proposed converter is a strong candidate for driving the display panel of a notebook computer.

Keywords: backlight; DC-DC converter; passive snubber; voltage stress (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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