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http://dx.doi.org/10.7471/ikeee.2020.24.3.853

2-Channel DC-DC Converter for OLED Display with RF Noise Immunity  

Kim, Tae-Un (School of Electrical and Computer Engineering, Chungbuk National University)
Kim, Hak-Yun (Zinitix Co.)
Choi, Ho-Yong (School of Electrical and Computer Engineering, Chungbuk National University)
Publication Information
Journal of IKEEE / v.24, no.3, 2020 , pp. 853-858 More about this Journal
Abstract
This paper proposes a 2-ch DC-DC converter for OLED display with immunity against RF noise inserted from communication device. For RF signal immunity, an input voltage variation reduction circuit that attenuates as much as the input voltage variation is embedded. The boost converter for positive voltage VPOS operates in SPWM-PWM dual mode and has a dead time controller to increase power efficiency. The inverting charge pump for negative voltage VNEG is a 2-phase scheme and operates in PFM using VCO to reduce output ripple voltage. Simulation results using 0.18 ㎛ BCDMOS process show that the overshoot and undershoot of the output voltage decrease from 10 mV to 2 mV and 5 mV, respectively. The 2-ch DC-DC converter has power efficiency of 39%~93%, and the power efficiency of the boost converter is up to 3% higher than the conventional method without dead time controller.
Keywords
RF noise immunity; boost converter; input voltage variation reduction circuit; charge pump; OLED;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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