• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.496-498
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• 2008

본 논문은 Single Transformer 구조의 PDP 전원 공급 장치를 위한 유지전원(Vs)단의 새로운 Post-Regulator를 제안한다. 제안된 회로는 새로운 방식의 Post Regulator로써 기존 방식에 비해 캐패시터, 다이오드, 인덕터 등의 소자가 불필요해지게 됨에 따라, 저가격 구현이 용이해진다. 뿐만 아니라 영전류 스위칭을 보장하여 스위칭 손실을 최소화 할수 있어 고효율화가 용이한 장점이 있다. 최종적으로 제안된 회로의 동작 원리를 고찰하고, 시뮬레이션 및 50인치 FHD급 PDP를 대상으로 실험을 통해 회로의 동작을 검증하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.2
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• pp.269-273
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• 2009

A voltage regulator can be used to reduce the effect of the power-supply noise on the control voltage of the VCO. An accurate analysis of the voltage regulator circuit is needed for the optimal design of the voltage regulator. This paper clarifies an inaccuracy in a recent paper on the replica-compensated regulator far supply-regulated PLLs: neglect of MOSFET parasitic capacitances. As a consequence, an improved analytical model is derived for the replica-compensated voltage regulator. The derived model is verified through circuit simulation. The voltage regulator has been fabricated in a standard $0.18{\mu}m$ 1P6M CMOS technology. The chip area is $1mm^2$.

• Transactions of The Korea Fluid Power Systems Society
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• v.7 no.4
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• pp.39-43
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• 2010

The flow regulators we widely use have some disadvantages. They have a constant flow within each regulator and an inaccuracy with extruding capillary. In this study, we have developed a new type of regulator which was made up of two different capillary tubes overlapped each other. The developed regulator can vary and control the amount of flow. The design parameters of the developed regulator are obtained by using the analytical software. We have proved that the developed regulator can control flow properly through making a trial product and experiment.

• Journal of Satellite, Information and Communications
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• v.12 no.4
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• pp.67-71
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• 2017

A solar array is main electrical energy source for Low-Earth-Orbit(LEO) satellite. The solar array cannot generate electrical energy during eclipse period, a battery supply electrical energy to the satellite. The electrical power of the solar array is changed in accordance with operating voltage and the solar array has the maximum power point. The solar array regulator makes the solar array supply electrical energy to the satellite and charge the battery. The solar array is connected to the solar array regulator input and the battery is connected to the solar array regulator output. The solar array regulator consists 2 of 3 hot redundant. One solar array regulator contains 3 DC-DC converters, and the solar array regulator operates stably even if the failure occur in one DC-DC converter. In this paper, the solar array regulator, the battery and the solar array operation is analyzed when the failure occur in one DC-DC converter.

• Journal of IKEEE
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• v.19 no.3
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• pp.304-310
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• 2015

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).

• JSTS:Journal of Semiconductor Technology and Science
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• v.12 no.3
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• pp.313-319
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• 2012

The power supply rejection (PSR) of low drop-out (LDO) voltage regulator is improved by employing an error amplifier (EA) which is configured so the power supply noise be cancelled at the output. The LDO regulator is implemented in a 0.13-${\mu}m$ standard CMOS technology. The external supply voltage level is 1.2-V and the output is 1.0-V while the load current can range from 0-mA to 50-mA. The power supply rejection is 46-dB, 49-dB, and 38-dB at DC, 2-MHz, and 10-MHz, respectively. The quiescent current consumption is 65-${\mu}A$.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1009_1010
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• 2009

This paper presents a power supply system with pre-regulator using zero voltage switching (ZVS) interleaving two-transistor forward converter for high input voltage and high power application. A SMPS has a advantage that a good efficiency, small size and light weight but has a noise problem. A linear power supply system has a advantage that a good stability, low ripple and noise but has a disadvantage that a big size, low efficiency and heat problem. To alleviate these problems, we propose an power supply system using dual ZVS interleaving two-transistor forward pre-regulator. The proposed converter is verified on a 1kW, 50kHz experimental prototype.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1020-1021
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• 2015

본 논문에서는 상용전압 AC 220V를 인가전압으로 사용하여 PMIC(Power Management IC)의 구동에 적합한 전압을 인가해주는 Pre-Regulator를 설계하였다. 설계된 Pre-Regulator는 상용전압을 사용하기 때문에 Device의 내압이 700V인 Magnachip $0.35{\mu}m$ BCD 공정을 이용하여 설계되었으며, 회로의 구성은 저전압 입력 보호 기능 및 JFET의 구동 제어를 위한 Under Voltage Lock Out(UVLO)회로, 전압조정기(Regulator)의 기준전압을 생성해주는 밴드갭 기준전압 발생(Bandgap Reference)회로, LDO(Low Drop Out)회로로 구성되어있다.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.270-275
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• 1998

A new single phase power factor correction rectifier/regulator with dc linked energy feedback circuit is proposed, which is capable of achieving the zero voltage switching (ZVS) of a boost rectifier stage without any auxiliary switch. The performance of the proposed rectifier/regulator is demonstrated through a 200W, 90 KHz prototype. This proposed rectifier/regulator with dc linked energy feedback circuit is particularly suited for distributed power system applications

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.353-354
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• 2014

본 논문은 대기전력저감 및 정확한 출력전압 제어가 가능한 새로운 방식의 SSR(Secondary Side Regulator) 회로를 제안한다. 제안방식은 기존의 1차 측 IC를 2차 측으로 옮김으로써 기존의 SSR의 장점인 정확한 출력전압의 제어가 가능하다는 점과 포토커플러 및 TL431을 사용하지 않는 방식이므로 대기전력저감 측면에 있어 유리한 장점을 갖는다. 또한 절연된 1-2차 측간 신호전송방법에 있어 사이즈가 작고 가격이 저렴한 CT(Current Transformer)를 사용하여 Pulse edge의 전달을 통해 제어를 한다. 제안회로의 타당성 검증을 위하여 이론적 해석과 10W 급 플라이백 컨버터의 실험결과를 통해 증명하였다.