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데드 타임 제어기를 이용한 웨어러블 AMOLED 디스플레이용 DC-DC 부스트 변환기
김찬유,김태운,최호용 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.3
This paper proposes a DC-DC boost converter for wearable AMOLED display using dead time controller to reducedead time and improve power efficiency. Also the DC-DC boost converter adopts PWM-SPWM (set-time variablepulse width modulation) dual-mode to enhance power efficiency under light load and decrease output voltage ripple. The proposed circuit has been designed using 0.18 μm BCDMOS process. Simulation results show that the circuit haspower efficiency of 39%∼96% and output ripple voltage of 2 mV under load current range of 1 mA∼70 mA. Thepower efficiency of the proposed circuit is up to 2% higher than the previous PWM-SPWM method and up to 8%higher than only PWM method. 본 논문에서는 데드 타임을 줄여 전력 효율을 높이기 위해 데드 타임 제어기를 이용한 웨어러블 AMOLED 디스플레이용DC-DC 부스트 변환기를 제안한다. 또한, 본 변환기에서는 경부하에서 전력 효율을 높이고 출력 전압 리플을 감소시키기 위해 PWM-SPWM (set-time variable pulse width modulation) 듀얼 모드를 이용한다. 제안하는 회로는 0.18 μm BCDMOS공정을 이용하여 시뮬레이션을 한 결과 1 mA∼70 mA의 부하 전류 범위에서 39%∼96%의 전력 효율과 2 mV의 리플 전압을 가졌다. 본 회로의 전력 효율은 PWM-SPWM 방식보다 최대 2% 상승하였고, PWM 방식보다 최대 8% 상승하였다.
Dual-Mode Noninverting DC-DC Buck Converter for Wearable AMOLED Display
김찬유,김진원,전승기,최호용 한국과학기술원 반도체설계교육센터 2019 IDEC Journal of Integrated Circuits and Systems Vol.5 No.3
This paper proposes a highly integrated dualmode noninverting DC-DC buck converter for wearable AMOLED display panels. The DC-DC buck converter is designed to increase power efficiency under light load using PWM-SPWM (set-time variable pulse width modulation) dualmode. The major role of the PWM-SPWM controller is to switch frequency according to the load current by changing only the set signal using the VCO (voltage controlled oscillator) in the conventional PWM control signal. The converter generates variable output voltages by changing reference voltage of error amplifier. The proposed circuit has been designed using a 0.35 m standard CMOS process and its core area of 1.2 mm x 1.3 mm. The measurement results show that the proposed circuit has power efficiency of 65% ~ 75% with output voltage of 2.0 V ~ 2.7 V for a load current range of 5 mA ~ 50 mA and input voltage 3.3 V ~ 4.2 V.
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.
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%.