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Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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Implementation of a High Efficiency SCALDO Regulator Using MOSFET

MOSFET를 이용한 고효율 SCALDO 레귤레이터 구현

  • Received : 2015.06.17
  • Accepted : 2015.08.12
  • Published : 2015.09.30
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Abstract

A SCALDO(Supercapacitor Assisted LDO) regulator is a new regulator having advantages of a SMPS(Switch Mode Power Supply) which has a good efficiency and a LDO(Low Drop-out) regulator which has stable output characteristics and good EMI(Electro Magnetic Interference) characteristics. However, a conventional SCALDO regulator needs a lot of power consumption to control its switches and it drops an efficiency of the circuit. In this paper, to reduce switching power consumption and improve an efficiency of the circuit, a new SCALDO regulator adopting MOSFETs as its switching parts is proposed and it is found out that the proposed SCALDO regulator has the maximum 9.5% higher efficiency than the conventional SCALDO regulator. We also try to simplify production process of the circuit by changing switching control method of the circuit from MCU(Micro-controller unit) based firmware control to hardware control using a comparator and a T-F/F(Flip Flop).

SCALDO(Supercapacitor Assisted LDO) 레귤레이터는 기존에 널리 사용되고 있는 SMPS(Switch Mode Power Supply)의 장점인 높은 효율과 LDO(Low Drop-out) 레귤레이터의 장점인 안정적인 출력 및 우수한 EMI(Electro Magnetic Interference)특성을 함께 가지는 레귤레이터로 현재 새롭게 연구되고 있는 전원회로이다. 하지만, 현재까지 연구된 SCALDO 레귤레이터의 경우 회로 내부의 스위치제어에 많은 전력이 소비되어 회로 전체의 효율이 감소되는 단점이 있다. 본 논문에서는 기존 SCALDO 레귤레이터의 단점을 극복하고 저전력으로 구동이 가능한 MOSFET를 SCALDO 레귤레이터에 적용함으로써 스위치제어 소비전력을 최소화하여 회로 전체의 효율을 향상시킨 새로운 SCALDO 레귤레이터를 구현 하였으며, 기존 SCALDO 대비 효율이 최대 9.5% 상승됨을 확인하였다. 또한 기존의 MCU(Micro-controller unit)를 이용한 펌웨어제어를 비교기 및 T-F/F(Flip Flop)을 이용한 하드웨어 제어로 대체함으로써 회로의 제작과정을 단순화 하였다.

Keywords

References

  1. Huei-Sheng Jhuang, Jia-Hui Wang, Zi-Yu Zeng and Chien-Hung Tsai, "A Low Dropout Linear Regulator with High Power Supply Rejection", IEEE ISIC 2009 12th, pp. 41-44, Dec, 2009.
  2. Yi-Ting Lee, Chia-Ling Wei and Chin-Hong Chen, "An Integrated Step-Down DC-DC Converter with Low Output Voltage Ripple", IEEE ICIEA 2010 5th, pp. 1373-1378, June, 2010.
  3. Z.-H.Shen and H.Min, "Combination method of DC-DC converter and LDO to improve efficiency and load regulation", IET Electronics Letters, Vol 47, No 10, pp. 615-617, May, 2011. https://doi.org/10.1049/el.2010.7135
  4. TI Application Report, "AN-556 Introduction to Power Supplies", Texas Instruments Incorporated, May, 2004.
  5. S.M.M.Mirtalaei, S.H.H.Sadeghi and R.Moini, "Radiated Emission Determination from Near Field Measurements for EMI Evaluation of Switch Mode Power Supplies Components by Method of Moments", IEEE PEDSTC 2013 4th, pp. 421-425, Feb, 2013.
  6. Nihal Kularatna and Jayathu Fernando, "A Supercapacitor Technique for Efficiency Improvement in Linear Regulators", IEEE IECON 2009 35th, pp. 132-135, Nov, 2009.
  7. Kosala Kankanamge and Nihal Kularatna, "Improving the End-to-End Efficiency of DC-DC Converters Based on a Supercapacitor-Assisted Low-Dropout Regulator Technique", IEEE Transaction on Industrial Electronics, Vol 61, No 1, pp. 223-230, Jan, 2014. https://doi.org/10.1109/TIE.2013.2245613
  8. Kalpani Kosala Gunawardane, "Analysis on Supercapacitor Assisted Low Dropout (SCALDO) Regulators", PhD Thesis of University of Waikato, 2014.
  9. International Rectifier, "Series PVN012PbF Microelectronic Power IC HEXFET Power MOSFET Photovoltaic Relay", PVN012PBF datasheet of International Rectifier, Feb, 2008.

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