• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1075-1076
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• 2008

이 논문에서는 전류형 MPPT(Maximum Power Point Tracking) 기법을 제안하고 적용하여 태양광 PCS(Power Conditioning System)의 기본적인 제어기를 설계하고 구현하였다. 기본적인 무변압기형 토폴로지에 전류 MPPT를 수행하고 이때에 얻어진 기준전류를 dc/dc 부스트 컨버터를 통해 dc-link에 전압을 충전하여 준다. 이 충전된 파워는 인버터를 통해 계통에 공급되게 된다. 이처럼 크게 MPPT제어, dc/dc컨트롤러, dc-link전류제어, 인버터 전류제어로 나뉘며 본 논문에서는 각 부분의 제어기를 살펴보고 실험을 통해 제어기의 성능을 확인하였다. 실험결과 제안된 전류 MPPT는 원활히 파워를 공급해주었고 dc/dc 부스터 컨버터를 거처 인버터 단까지 파워를 안정적으로 발전하는 것을 확인하였다.

• Journal of Navigation and Port Research
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• v.31 no.10
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• pp.839-844
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• 2007

This paper describes the performance of DC-DC converters for buoy such as buck, boost, and buck-boost. The operating characteristic and charging efficiency with battery, which has a considerable properties about converters with PV(photovoltaic) system, is analyzed in this paper. It is performed by using the MPPT(Maximum Power Point Tracker) algorithm The basic equations of switching operation for converter are described, and the equations are analyzed with according to switch state. Whereas this analysis is directed toward the selection of converter for buoy, it also provides the insight into the behaviour of converter and performance of the proposed algorithm Finally, the suitable DC-DC converter is proposed for buoy, and the characteristic experiment is performed with the buck converter.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.6
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• pp.531-538
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• 1999

This paper proposes a fuzzy logic controller(FLC) for DC-DC converters in order to obtain good l perfonnances that can not be achieved by linear control tc'Chniques in the presence of wide parameter v variations. 'While the standard controller uses error and derivative of e$\pi$or, the proposed controller uses state v variables. Such method is ve$\pi$ efficient in case of DC-DC converters and can guarantee both stable s small-signal responses and improved large signal responses. The presented approach method is general and c can be applied to any dc-dc converter topologies. Through the simulations of booster, we verify the pro[Xlsed C control tc'Chnique can give a satisfactory perfonnance.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.1
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• pp.10-16
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• 2004

In this thesis, improved full wave mode ZVT(Zero-Voltage-Transition) PMW DC-DC Converters are presented to maximize the regeneration ratio of resonant energy by only putting an additional diode In series with the auxiliary switch. The operation of the auxiliary switch in a half wave mode makes it possible soft switching operation of all switches including the auxiliary switch whereas it is turned off with hard switching in conventional converter. The increase of the regeneration ratio to resonant energy results in low commutation losses and minimum voltage and current stresses. The operation principles of the improved ZVT PWM DC-DC Converters are theoretically analyzed using the boost converter topology as an example. Both theoretical analysis and experimental results verify the validity of the PWM boost converter topology with the improved full wave mode ZVT PWM converters.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.34S no.9
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• pp.118-125
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• 1997

This paper proposed a new partial resonant 3.PHI. AC-DC boost converter of high efficiency using lossless snubber. The proposed converter, DCM (Discontinuous Current Mode) has a merit of simple controlled circuit because the input current control discontinuously. But turned off switching loss and stress of the switching device increase when the switch turned off at the peak of current. Therefore, the paper improves efficiency by adopting the PRS$^{2}$(Partial Resonant Soft Switching) in 3.PHI. AC-DC boost converter and makes the unity power factor. The PRS$^{2}$ is reduced a current/voltage stresses of switching devices. Also, a DCMPRS$^{2}$M(Discontinuous Conduction Mode Partial Resonant Soft Switching Method) appear the current and voltage equation of this circuit. The paepr examine in a 3.PHI. AC-DC boost converter and show the result of that.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.216-218
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• 2006

본 논문에서는 연료전지용 듀얼 부스트 컨버터의 전압제어루프의 피드백 루프에 디지털 필터를 도입하여 부하에 의해 발생하는 출력전압의 저고조파 리플성분을 제거한 측정값을 사용함으로써 입력전류의 저고조파 리플을 제거하고, 전류제어루프에 predictive deadbeat 제어기법을 적용하여 제어주기와 제어알고리듬 계산에 의한 시간적 지연에 의해 발생되는 동적응답특성의 저하를 최소화한다. 센서를 사용하는 대신 연료전지 스택에 공급되는 수소와 공기의 압력과 스택의 출력전류에 결정되는 연료전지의 전압-전류 특성곡선을 이용하여 부스터 컨버터의 입력전압을 계산하고 전류를 제어함으로써 연료전지 시스템의 성능을 최적화한다.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.341-342
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• 2010

본 논문에서는 종전의 3상 H-브리지 PWM 인버터와 다른 토폴로지를 갖는 3상 벅-부스트 DC-AC 인버터를 위한 제어 기법을 제안하였다. 이를 위하여 공간벡터 변조 방식(SVM : Space Vector Modulation) 및 PI 제어기를 벅-부스터 DC-AC 인버터에 적용하고 이를 PSIM 시뮬레이션 통하여 타당성을 검증하였다.

• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.379-381
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• 1995

Many new electronic products are required to have a near unity power factor and a distortion free input current waveform. In this paper, a high performance single phase PWM AC/DC converter with input power factor correction is proposed. This proposed control strategy has many advantages which include one semiconduction switch, simplified control circuit, high performance features and continuous input current. The experimental results are included to verify the validity of this approach.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.6
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• pp.2747-2753
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• 2011

In this paper, a PWM current-mode DC-DC boost converter for mobile phone flash application has been proposed. The converter which is operated with 5 Mhz high switching frequency is capable of reducing mounting area of passive devices such as inductor and capacitor, consequently is suitable for compact mobile phones. This boost converter consists of a power stage and a control block. Circuit elements of the power stage are inductor, output capacitor, MOS transistors and feedback resistors. Meanwhile, the control block consists of pulse width modulator, error amplifier, oscillator etc. Proposed boost converter has been designed and verified in a $0.5\;{\mu}m$ 1-poly 2-metal CMOS process technology. Simulation results show that the output voltage is 4.26 V in 3.7 V input voltage, output current 100 mA which is larger than 25 ~ 50 mA in conventional 500 Khz driven converter when the duty ratio is 0.15.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1038-1040
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• 1992

Booster is used widely as one of the step-up DC/DC power converter in power conversion process for fuel cell power plant which have the electrical characteristic of the high current density and low cell voltage. In view of control system, booster can be unstable when it is operated in broad operation range because the transfer function of booster has zero in right half plane of s-domain. So for reliable operation, controller must make the system stable in whole working range. In this paper, the two control method such as digital PID control and fuzzy control is studied for booster output voltage regulation in fuel cell plant. The design procedure of PID control and fuzzy control is described. And the experiment of designed controller action is performed in various operation points for controller performance test.