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데드 타임 제어기를 이용한 웨어러블 AMOLED 디스플레이용 3-채널 DC-DC 변환기 설계
김찬유(Chan-You Kim),김태운(Tae-Un Kim),김학윤(Hak-Yoon Kim),최호용(Ho-Yong Choi) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.6
This paper proposes a highly integrated 3-channel power supply with a noninverting DC-DC boost converter, an inverting charge pump, and a LDO for wearable AMOLED Display panels. The DC-DC boost converter for a positive channel, VPOS, is designed using PWM-SPWM (set-time variable pulse width modulation) dual-mode and a dead time controller to increase power efficiency. The inverting charge pump for a negative channel, VNEG, using the PSM mode is adopted to decrease device size and increase power efficiency. A LDO is adopted to use a power supply for touch screen. Our proposed circuit has been designed using 0.18 μm BCDMOS process. Simulation results show that VPOS has 4.6 V with 3 mV output voltage ripple, VNEG has -0.6 V ∼ -2.3 V with 1 mV ∼ 20 mV output voltage ripple and AVDD has 2.8 V for both load current range of 1 mA ∼ 70 mA and input voltage of 2.9 V ∼ 4.6 V. And total power efficiency of our proposed circuit has 57% ∼ 89%.
웨어러블 AMOLED 디스플레이용 2-채널 DC-DC 변환기 구현
김찬유(Chan-You Kim),김진원(Jin-Won Kim),전승기(Seung-Ki Jeon),김학윤(Hak-Yun Kim),최호용(Ho-Yong Choi) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
In this paper, a 2-channel power supply with a noninverting DC-DC buck converter and an inverting charge pump has been designed for wearable AMOLED displays. The DC-DC buck converter for a positive channel,VPOS , has been designed using a PWM-SPWM (set-time variable pulse width modulation) dual mode to increase power efficiency under light load. And the inverting charge pump for a negative channel, VNEG , using the PSM (pulse skipping modulation) mode is adopted to decrease device volume. The proposed circuit has been implemented using a 0.35 μm standard CMOS process with core area of 8.4 ㎟for VPOS and 0.7 ㎟ for VNEG . Experiment results show that V<SUP>POS</SUP> has 2 V ∼ 2.7 V and VENG has -3 V ∼ -2.5 V for both input voltage of 3.3 V ∼ 4.2 V and load current of 5 mA ∼ 50 mA. And the proposed circuit has power efficiency of 65% ∼ 75% for VPOSand 49% ∼ 72% for VENG according to load current range of 5 mA ∼ 50 mA.
AMOLED 디스플레이용 3-채널 DC-DC 변환기 설계
전승기(Seung-Ki Jeon),김찬유(Chan-You Kim),김학윤(Hak-Yoon Kim),최호용(Ho-Yong Choi) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
In this paper, we design a highly integrated 3-channel DC-DC converter. Two channel, a positive voltage VPOS and a negative voltage VNEG, are designed for two supply voltages of AMOLED display. For positive voltage, VPOS, a boost converter followed by a LDO (Low Dropout) is designed using PSM/PWM dual mode to minimize power dissipation and decrease output voltage ripple. For a negative voltage, VNEG, a 0.5 x regulated inverting charge pump is designed to decrease size and power dissipation. For an additional positive voltage, V A VDD , a LDO is designed using an error amplifier to drive another fixed positive voltage. The proposed circuit has been designed using a 0.18㎛ BCDMOS process. Simulation results show that our integrated power supply has power efficiency of 57% ~ 89% for load current range of 1 mA ~ 70 mA and output voltage ripple less than 20 mV.