• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 연구회 합동 학술발표회 논문집
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• pp.60-63
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• 1998

The widely used power supply (Switched Mode Power Supply : SMPS) as a source in order to stabilize direct current for electronics or communication systems has merits, when it is compared to the existing source for stability, such as high efficiency, small size, light weight by means of switching process of the semiconductor device which controls the flow of power. However, due to existence of inductors and capacitors used for charging energy, the source part in electronic or communication systems hasn't reached the speed, that is supposed to get, for achieving smaller size and lighter weight. In order to get smallness in size, it is necessary to increase switching frequency. And that makes devices for measuring energy smaller. Nevertheless, the rise switching frequency brings increases in switching loss, inductor loss, and power loss. Also, the occurrence of surge and noise caused by high frequency switching is getting higher. The resonant converter has been considered as one of methods that give solutions for the problems of SMPS and that method have been paid attention as a source technology in electronics and communication.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1891-1895
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• 2003

Switch-mode power supplies (SMPS) have become a major source of conducted electromagnetic interference (EMI) which is the combination between differential mode (DM) noise and common mode (CM) noise. This paper presents the conducted EMI reduction approach in flyback switched mode power supply by rerouting for circuit balance to reduce common mode noise. And differential mode noise can be reduce by adding $c_x$ capacitor across the input power line, and passive element to the gate drive of switching device MOSFET to slow down the switching times. This combination of our approach is the effective way to reduce the conducted EMI and it is also a cost effective for product design

• 한국정보통신학회논문지
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• 제16권9호
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• pp.2003-2008
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• 2012

LED는 기존 광원에 비하여 낮은 전력 소모량과 긴 수명, 작은 크기 등의 장점으로 예상보다 더 큰 성장을 가져올 것이라는 전망도 있다. LED 조명시스템에서 LED를 동작시키기 위해서는 구동 시스템이 필요하다. 대용량에서는 Switched Mode Power Supply (SMPS)가 Linear Regulator 보다 효율이 높기 때문에 주로 사용되고, 아날로그 방식 혹은 디지털 방식으로 이를 제어하고 있다. 디지털 제어방식는 중앙처리장치인 MCU나 DSP가 기존의 아날로그 제어 칩에 비해 단가가 비싸기 때문에, SMPS 시장에 진입이 쉽지 않았다. 하지만 LED 조명시스템처럼 하나의 MCU안에 다양한 디지털 제어 기능들을 통합시켜 전체 시스템을 구현함으로써 이득을 취할 수 있다. 본 논문에서는 이러한 디지털 제어방식을 적용함에 있어 저가형 MCU를 이용하여 LED 구동 전류를 개선할 수 있는 알고리즘을 제안하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1528.1-1529
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• 2011

Scribing the transparent conductive oxide(TCO) is an essential technology for the large scaled dye-sensitized solar cell(DSC) and the commercialization of the DSC. Laser systems are most used for scribing technology due to their precision. However, it is difficult to generalize systems because most systems are large and heavy. In this study, we tried to simplificate the Nd:YAG laser system for scribing TCO of the DSC by using switched mode power supply(SMPS) technique. The continuous conduction mode booster converter topology is applied and MC34262 power factor controller is used for the variable frequency control. Finally, SMPS circuit which specifications are 400W of capacity, 400V DC output and 98% of efficiency is fabricated. And it is demonstrated that the scribing TCO is completed by the Nd:YAG laser using this SMPS circuit.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.504-508
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• 2004

An EMC analysis of a switched mode power supply (SMPS) have been usually using unbalance circuit topologies and the major factor of disturbance is parasitic capacitance. We have proposed a balanced switching converter circuit, which is an effective way to reduce the common mode conducted noise. In this paper presents the relationship between common mode current and radiated field.

• 한국전자파학회논문지
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• 제29권2호
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• pp.142-145
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• 2018

본 논문에서는 전원보드의 공통모드 노이즈 감쇠를 위한 디커플링 커패시터 회로를 효율적으로 시뮬레이션할 수 있는 구조분할 해석기법을 제시한다. 제시하는 구조분할 해석기법이 적용된 전원보드 설계에서는 보드를 두 부분으로 구조분할하였으며, 분할된 구조와 커패시터 회로의 임피던스 파라미터를 재결합하기 위한 방법을 제시하였다. 구조분할 해석기법을 적용함으로써 공통모드 노이즈 감쇠 시뮬레이션에 수행되는 시간을 46 % 이상 단축하였다.

• 한국산학기술학회논문지
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• 제15권1호
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• pp.436-440
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• 2014

본 논문에서는 PCB Plane 레이어가 SMPS에 미치는 영향을 확인하기 위하여 일반적인 단면 PCB와 Plane을 갖는 양면 PCB를 이용한 SMPS의 출력특성을 각각 분석하였다. 그 이후 동일한 레이아웃을 갖는 PCB의 반대 면에 Ground Plane을 설치한 양면PCB를 이용하여 SMPS 기판을 작성하여 단면 PCB SMPS에 적용해서 분석한 모든 부품을 이동 실장한 후 두 SMPS의 출력특성을 전압, 전류, 고주파잡음 측면에서 비교 분석하였다. 그 결과 단면PCB의 SMPS는 100MHz대역의 고주파 잡음이 150mV인 반면, Ground Plane을 설치한 SMPS에서는 50mV로 1/3 저감되는 현상을 확인하였다. 그리고 고주파 잡음 성분 또한 감소됨을 확인하였다.

• 반도체디스플레이기술학회지
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• 제17권1호
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• pp.21-26
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• 2018

In this paper, a multiple coupling inductor with expandable-integrated magnetic structure was proposed to enable miniaturization of external switched mode power supply (SMPS) for a large display. Inductance formula of the proposed inductor structure was derived through magnetic circuit analysis for a simple inductance designing process. The proposed inductor was applied into a 1kW class interleaved bridgeless power factor correction circuit which requires four inductors, and experimental steady state result of the circuit was compared. According to the experimental result, it was found that the proposed multiple coupling inductor shows the electrical characteristics that can replace the conventional separated inductors and is suitable for miniaturization of the SMPS since the circuit configuration is possible with one shared inductor.

• 전기학회논문지P
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• 제51권1호
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• pp.10-17
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• 2002

Due to the development of information communication field, the interest of the SMPS(Switched Mode Power Supply) is increased. The size and weight of SMPS are decided by inductor, capacitor and transformer. Thus, the low loss converter which is operated in high speed switching is required. The resonant FB DC-DC converter is able to operate in high speed switching and apply to high power field because the switching loss is low. In this thesis, it is proposed to control strategy for constant output power of resonant FB DC-DC converter in variable input voltage. The proposed control system is a digital I-PD type control and apply to phase-shift resonant type controller. The output voltage tracks reference without steady state error in variable input voltage. The validity of proposed control strategy is verified from results of simulation and experiment.

• International Journal of Internet, Broadcasting and Communication
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• 제5권1호
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• pp.6-8
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• 2013

In this paper, we present an intelligent digital controller circuit which can be applied to automatic voltage regulation. The proposed solid state transformer with Pspice simulation model shows that our approach is very efficient and produces the desirable output. It is comparable to an ordinary magnetic coupled autotransformer.