• 전자공학회논문지
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• 제51권1호
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• pp.52-56
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• 2014

본 논문은 고효율 전력증폭기는 무선전력전송을 위한 게이트와 드레인 바이어스 조절 회로를 사용하여 설계하였다. 이 조절 회로는 PAE (Power Added Efficiency)를 개선하기 위해 사용되었다. 게이트와 드레인 바이어스 조절 회로는 directional coupler, power detector, and operational amplifier로 구성되어있다. 구동증폭기를 사용하여 고이득 2단 증폭기는 전력증폭기의 낮은 입력단에 사용되었다. 게이트와 드레인 바이어스 조절회로를 사용하여 제안된 전력증폭기는 낮은 전력에서 높은 효율성을 가질 수 있다. PAE는 80.5%까지 향상되었고 출력전력은 40.17dBm이다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.179-182
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• 2000

Adiabatic dynamic CMOS logic circuits, which are called ADCL circuits, promise us to implement low power logic circuits. Since the power supply source for ADCL circuits had not been developed, we proposed a power supply circuit for them. It is shown experimentally that by using the power supply circuit ADCL circuits can work with lower power consumption than conventional static CMOS circuit. In this paper, the power supply circuit is improved so that the power consumption can be reduced. Also, it is shown by some experiments that by using the circuit, ADCL circuits can work with lower power consumption than before Improving.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.163-165
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• 2003

Over the past several years, the application extent of the real-time systems is being expanded with the progress of civilization. An effort to minimize power consumption at the system is being accomplished in several fields from the design of an analog/digital circuit up to the device level Things of this effort have included the power optimum-technique to minimize power consumption at the digital logic circuit and the dynamic managed skill by means o( the decision of the operating system. In this paper, we designed of low power system by using Power-optimized method. As an effective low-power design, we designed the low power system which it has a monitoring system within the main board and a personal computer.

• 전자공학회논문지D
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• 제35D권12호
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• pp.41-47
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• 1998

효율적인 바디 바이어스와 자유로운 공급 전압(supply voltage)으로 동작할 수 있는 동적 문턱 전압(dynamic threshold voltage)제어를 이용한 고속, 저전력 SOI 인버터를 새로이 제안하였다. 제안된 회로의 특성을 BSIM3SOI 회로 시뮬레이터와 ATLAS 소자 시뮬레이터를 이용해 검증하였고 다른 SOI 회로와 비교함으로써 제안한 회로가 우수한 성능을 가짐을 보였다. 제안된 회로는 1.5V의 공급 전압에서 같은 전력 소모를 갖는 기존의 SOI 회로보다 27% 빠르게 동작하였다.

• Journal of Power Electronics
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• 제7권4호
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• pp.294-300
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• 2007

This paper deals with a design of a bootstrap power supply using snubber energy regeneration, which is used to power a high-side gate driver of a half-bridge circuit. In the proposed circuit, the energy stored in the low-side snubber capacitor is transferred to the high-side bootstrap capacitor without any magnetic components. Thus, the power dissipation in the RCD snubber can be effectively reduced. The operation principle and design method of the proposed circuit are presented. The experimental results are also provided to show the validity of the proposed circuit.

• 전력전자학회논문지
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• 제4권2호
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• pp.111-121
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• 1999

대용량 IGBT를 위한 새로운 능동 게이트 구동회로를 제안한다. IGBT의 우수한 스위칭 성능을 성취하기 위해 필요한 여러 구동 조건들을 최적으로 조합시킨 게이트 구동 회로이다. 스위칭 노이즈와 스트레스를 감소시키기 위해 필요한 느린 구동 조건과 스위칭 속도를 증가시키고 손실을 저감시키기 위해 요구되는 고속 구동 조건들을 동시에 만족시키고 있다. 또한 작은 전류의 턴-온시 발생되는 진동현상을 효과적으로 감쇠시킬 수 있는 특성을 지니고 있다.

• Journal of Power Electronics
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• 제12권5호
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• pp.699-707
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• 2012

This paper proposes a single-stage half-bridge electronic ballast with a high power factor using only a single coupled inductor. Compared to conventional high power factor electronic ballasts, the proposed ballast is a simpler circuit with a low cost and a high reliability. The proposed ballast is made up of a power-factor-correction (PFC) circuit and a self-oscillating class-D inverter. The PFC and inverter stages of the proposed ballast are simplified by sharing only a single coupled inductor and two common switches. The proposed PFC circuit can achieve a high power factor and low voltage stresses of the switches. A saturable transformer in the self-oscillating class-D inverter determines the switching frequency of the ballast. Experimental results obtained on a 30W fluorescent lamp are discussed.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.397-400
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• 2015

본 논문에서는 낮은 듀티 동작의 센서 노드를 위한 저비용 MPPT 제어기능을 갖는 빛에너지 하베스팅 회로를 제안한다. 환경, 구조물 모니터링 센서와 같은 연속적인 동작이 요구되지 않는 센서 노드가 어플리케이션이며, 기존의 MPPT(Maximum Power Point Tracking) 제어방법과 다르게 간단한 회로들을 이용하여 저비용 MPPT 제어 방법을 구현하였다. 제안된 MPPT 방법은 솔라셀의 개방회로전압과 MPP 전압간의 비례관계를 이용하여, 솔라셀의 개방회로 전압을 주기적으로 샘플링함으로써 최대 가용전력이 생성되는 지점을 추적하고 이를 부하로 전달한다. 제안된 회로는 $0.35{\mu}m\;CMOS$ 공정으로 설계되었으며, 칩 면적은 패드를 포함하여 $975{\mu}m{\times}1025{\mu}m$이다. 제작된 칩을 측정한 결과 주기적으로 솔라셀의 개방회로를 샘플링하여 솔라셀의 MPP를 실시간 추적하는 것을 확인하였다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제50권8호
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• pp.392-401
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• 2001

This paper presents the single-stage high power factor AC to DC converter operated in active-clamp mode. The proposed converter is added active-clamping circuit to boost-flyback single-stage power factor corrected power supply. The active-clamping circuit limits voltage spikes, recycles the energy trapped in the leakage inductance, and provides a mechanism for achieving soft switching of the electronic switches to reduce the switching loss. The auxiliary switch of active-clamping circuit uses the same control and driver circuit as the main switch to reduce the additional cost and size. To verify the performance of the proposed converter, a 100W converter has been designed. The proposed converter gives good power factor correction, low line current harmonic distortions, and tight output voltage regulation, as used unity power factor.

• 전기전자학회논문지
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• 제21권1호
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• pp.66-69
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• 2017

In recent year, energy harvesting technologies from the ambient environments such as light, motion, wireless waves, and temperature again a lot of attraction form research community [1-5] due to its efficient solution in order to substitute for conventional power delivery methods, especially in wearable together with on-body applications. The drawbacks of battery-powered characteristic used in commodity applications lead to self-powered, long-lifetime circuit design. Thermoelectric generator, a solid-state sensor, is useful compared to the harvesting devices in order to enable self-sustained low-power applications. TEG based on the Seebeck effect is utilized to transfer thermal energy which is available with a temperature gradient into useful electrical energy. Depending on the temperature difference between two sides, amount of output power will be proportionally delivered. In this work, we illustrated a low-input voltage energy harvesting circuit applied discontinuous conduction mode (DCM) method for getting an adequate amount of energy from thermoelectric generator (TEG) for a specific wearable application. With a small temperature gradient harvested from human skin, the input voltage from the transducer is as low as 60mV, the proposed circuit, fabricated in a $0.6{\mu}m$ CMOS process, is capable of generating a regulated output voltage of 4.2V with an output power reaching to $40{\mu}W$. The proposed circuit is useful for powering energy to battery-less systems, such as wearable application devices.