• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.708-712
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• 2001

A new phase-shifted parallel-input/series-output (PI SO) dual inductor-fed push-pull converter for high-power step­up applications is proposed. This converter is operated at a constant duty cycle and employs an auxiliary circuit to control the output voltage with a phase-shift between the two modules. It features a voltage conversion characteristic which is linear to changes in the control input, and high step-up ratio with a greatly reduced switch turn-off stress resulting in a significant increase in the converter efficiency. It also shows a low ripple content and low root-mean-square (RMS) current in the output capacitor. The operational principle is analyzed and a comparative analysis with the conventional pulse-width-modulated (PWM) PISO dual inductor-fed push-pull converter is presented. A 50kHz, 800W, 350Vdc prototype with an input of 20-32Vdc has also been constructed to validate the proposed converter. The proposed converter compares favorably with the conventional counterpart and is considered well suited to high-power step-up applications.

• 한국정보통신학회논문지
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• 제10권10호
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• pp.1905-1913
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• 2006

유비쿼터스 센서 네트워크 구현을 위한 하드웨어와 소프트웨어에 대한 연구가 활발히 이루어지고 있다. 본 논문은 현재 널리 사용되고 있는 블루투스 접속 방식을 사용하면서 RF 무선 접속을 제공하는 이중 접속 방식의 무선 센서 노드를 개발하는 내용이다. 이 센서 노드는 Atmega32 마이크로콘트롤러, 블루투스 모듈, UHF RF 송수신 모듈, 그리고 온습도 및 광도 센싱 IC를 사용하였다. 또한 각 모듈의 동작을 제어 할 F/W를 GCC 컴파일러를 사용하여 C 언어로 개발하였다. 개발된 센서 노드는 블루투스 접속이 15m까지, RF 접속이 60m 까지 가능하였다. 공급 전압 5V 이상에서 안정적인 동작을 하였으며 소비 전류는 대기 시 평균 21mA, 동작 시 평균 63mA가 되었다.

• Journal of Power Electronics
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• 제1권2호
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• pp.78-87
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• 2001

A new high-power step-up based on the two-module parallel-input (PISO) modular dual inductor-fed push-pull converter is proposed. The proposed converter is operated at a constant duty cycle and employs and auxiliary circuit to control the output voltage with a phase-shift between two modules. It shows a high efficiency due to the greatly reduced switch turn-off stress. It also shows a high and linear voltage conversion ratio, low current stress in the output capacitor, and fast control-to-output dynamics. The operation principles and the mathematical models of the proposed converter are presented. Features of the proposed converter are discussed in comparison with the two-module PISO modular dual inductor-fed push-pull converter. Also, experimental results from a 50kHz, 800W, 350 Vdc prototype with an input voltage range of 20-32 Vdc are provided to confirm the validity of the proposed converter. The new converter compares favorably with the conventional counterpart, and is considered well siuted to high-power step-up applications.

• Journal of Power Electronics
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• 제7권3호
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• pp.246-256
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• 2007

In this paper, a novel type auxiliary active edge resonant snubber assisted zero current soft switching pulse modulation Single-Ended Push Pull (SEPP) series load resonant inverter using IGBT power modules is proposed for cost effective consumer high-frequency induction heating (IH) appliances. Its operating principle in steady state is described by using each switching mode's equivalent operating circuits. The new multi resonant high-frequency inverter with series load resonance and edge resonance can regulate its high frequency output power under a condition of a constant frequency zero current soft switching (ZCS) commutation principle on the basis of the asymmetrical pulse width modulation (PWM) control scheme. Brand-new consumer IH products using the proposed ZCS-PWM series load resonant SEPP high-frequency inverter using IGBTs is evaluated and discussed as compared with conventional high-frequency inverters on the basis of experimental results. In order to extend ZCS operation ranges under a low power setting PWM as well as to improve efficiency, the high frequency pulse density modulation (PDM) strategy is demonstrated for high frequency multi-resonant inverters. Its practical effectiveness is substantially proved from an application point of view.

• 방사선산업학회지
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• 제5권4호
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• pp.313-316
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• 2011

[$^{18}F$]FDG (2-[$^{18}F$] Fluoro-2-deoxy-D-Glucose), which is required Automated Synthetic Module for production, is most often used Radiopharmaceuticals in nuclear medicine. In this study, an Automated Synthesis Module was developed to produce FDG in two consecutive time when F-18 feds continuously by modifying a domestic FDG Automated Synthetic Module on structural geometry and control system. The results were showed that the Average Synthesis Yields on the developed Automated Synthetic Module were $45{\pm}3%$ (n=20), $50{\pm}3%$ (n=20) respectively. The Quality Control results, such as Radio TLC, Radiochemical purity, Gamma-counter, pH, LAL Test, Micro bacteria test, showed in same level with domestic [$^{18}F$]FDG Auto-Synthetic modules. Therefore, if some features were improved by considering the components life time and appearance, commercial sales can be expected because of low price and easy maintenance compared with foreign products.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2003년도 제27회 추계학술대회
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• pp.44-44
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• 2003

As a basic measurement tool in the areas of animal models of human disease, gene expression and therapy, and drug discovery and development, small animal PET imaging is being used increasingly. An ideal small animal PET should have high sensitivity and high and uniform resolution across the field of view to achieve high image quality. However, the combination of long narrow pixellated crystal array and small ring diameter of small animal PET leads to the degradation of spatial resolution for the source located at off center. This degradation of resolution can be improved by determining the depth of interaction (DOI) in the crystal and by taking into account the information in sorting the coincident events. Among a number of 001 identification schemes, dual layer phsowich detector has been widely investigated by many research groups due to its practicability and effectiveness on extracting DOI information. However, the effects of each crystal length composing dual layer phoswich detector on DOI measurements and image qualities were not fully characterized. In order to minimize the DOI effect, the length of each layer of phoswich detector should be optimized. The aim of this study was to perform simulations using a simulation tool, GATE to design the optimum lengths of crystals composing a dual layer phoswich detector. The simulated small PET system employed LSO front layer LuYAP back layer phoswich detector modules and the module consisted of 8${\times}$8 arrays of dual layer crystals with 2 mm ${\times}$ 2 mm sensitive area coupled to a Hamamatsu R7600 00 M64 PSPMT. Sensitivities and variation of radial resolutions were simulated by varying the length of LSO front layer from 0 to 10 mm while the total length (LSO + LuYAP) was fixed to 20 mm for 10 cm diameter ring scanner. The radial resolution uniformity was markedly improved by using DOI information. There existed the optimal lengths of crystal layers to minimize the variation of radial resolutions. In 10 cm ring scanner configuration, the radial resolution was kept below 3.4 mm over 8 cm FOV while the sensitivity was higher than 7.4% for LSO 5 mm : LuYAP 15 mm phoswich detector. In this study, the optimal length of dual layer phoswich detector was derived to achieve high and uniform radial resolution.

• Journal of Power Electronics
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• 제4권3호
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• pp.138-151
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• 2004

In this paper, a constant frequency phase shifting PWM-controlled voltage source full bridge-type series load resonant high-frequency inverter using the $4^{th}$ generation IGBT power modules is presented for innovative consumer electromagnetic induction heating applications, such as a hot water producer, steamer and super heated steamer. The bridge arm side link passive capacitive snubbers in parallel with each power semiconductor device and AC load side linked active edge inductive snubber-assisted series load resonant tank soft switching inverter with a constant frequency phase shifted PWM control scheme is evaluated and discussed on the basis of the simulation and experimental results. It is proved from a practical point of view that the series load resonant and edge resonant hybrid high-frequency inverter topology, what is called, DE class type, including the variable-power variable-frequency regulation function can expand zero voltage soft switching commutation area even under low output power setting ranges, which is more suitable and acceptable for newly developed induction heated dual pack fluid heaters. Furthermore, even the lower output power regulation mode of this high-frequency load resonant tank inverter circuit is verified so that this inverter can achieve ZVS with the aid of the single auxiliary inductor snubber.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.774-777
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• 2005

In this paper, a constant frequency phase shifting PWM controlled voltage source full bridge-type series load resonant high-frequency inverter using the IGBT power modules is presented for innovative consumer electromagnetic induction heating applications such as a hot water producer, steamer and super heated steamer. The full bridge arm side link passive quasi-resonant capacitor snubbers in parallel with the each power semiconductor device and high frequency AC load side linked active edge inductive snubber-assisted series load resonant tank soft switching inverter with a constant frequency phase shifted PWM control scheme is discussed and evaluated on the basis of the simulation and experimental results. It is proved from a practical point of view that the series load resonant and edge resonant hybrid high-frequency soft switching PWM inverter topology, what is called class DE type. including the variable-power variable-frequency(VPVF) regulation function can expand zero voltage soft switching commutation range even under low output power setting ranges, which is more suitable and acceptable for induction heated dual packs fluid heater developed newly for consumer power utilizations. Furthermore, even in the lower output power regulation mode of this high-frequency load resonant tank high frequency inverter circuit it is verified that this inverter can achieve ZVS with the aid of the single auxiliary inductor snubber.

• 전자공학회논문지D
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• 제35D권9호
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• pp.26-34
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• 1998

본 논문은 주사전자현미경(SEM)의 전자총을 이용하여 MCM 또는 PCB 회로기판의 신호연결선에서 전압차를 유도시켜 개방/단락 등의 결함을 측정 검사하는 방법을 제시한다. 본 실험에서는 주사전자현미경의 구조를 변형시키지 알고 회로기판의 개방/단락 검사를 실시할 수 있는 이중전위전자빔(Dual Potential) 검사방법을 사용한다. 이중전위전자빔(Dual Potential) 측정검사 방법은 이차전자수율 값 δ의 차이를 유기시키는 δ < 1 인 충전 전자빔과 δ > 1 인 읽기 전자빔을 사용하여 한 개의 전자총이 각각 다른 가속전압에 의해 생성된 두 개의 전자빔으로 측정하는 방법으로 특정 회로네트에 대한 개방/단락 등의 측정 검사가 가능하다. 또한 읽기 전자빔을 이용할 경우 검사한 회로 네트를 방전시킬 수 있어 기판 도체에 유기된 전압차를 없앨 수 있는 방전시험도 실시할 수 있어, 많은 수의 회로네트를 지닌 회로 기판에 대해 측정 검사할 때 충전되어 있는 회로네트에 대한 측정오류를 줄일 수 있다. 측정검사를 실시한 결과 glass-epoxy 회로기판 위에 실장된 구리(Cu) 신호연결선은 7KeV의 충전 전자빔으로 충전시키고 10초 이내에 주사전자현미경을 읽기 모드로 바꾸어 2KeV의 읽기 전자빔으로 구리표면에서의 명암 밝기 차이를 읽어 개방/단락 상태를 검사할 수 있었다. 또한 IC 칩의 Au 패드와 BGA의 Au 도금된 Cu 회로패드를 검사한 결과도 7KeV 충전 전자빔과 2KeV 읽기 전자빔으로 IC칩 내부회로에서의 개방 단락 상태를 쉽게 검사할 수 있었다. 이 검사방법은 주사전자현미경에 있는 한 개의 전자총으로 비파괴적으로 회로 기판의 신호 연결선의 개방/단락 상태를 측정 검사할 수 있음을 보여 주었다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2011년도 전력전자학술대회
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• pp.287-289
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• 2011

본 논문은 인피니언 테크놀로지스의 RC-IGBT (Reverse Conducting Isolated Gate Bipolar Transistor)와 SOI 드라이브 IC(Integrated Circuit)를 사용한 DIL(Dual-In-Line) 구조의 저전력 모듈인 CIPOS TM (Control Integrated POwer System) 제품을 소개한다. 이 전력 모듈은 최적의 게이트 구동회로, 트렌치 필드스톱의 RC-IGBT를 사용하여 기존의 IGBT 와 Diode를 사용하는 구조에서 최소화 된 패키지 크기를 사용하여 높은 효율을 구현할 수 있다. 본 논문을 통하여 인버터의 어플리케이션에 적합하게 설계된 전력모듈에 대한 소개와 그 특징 및 시스템 구성을 위한 고려사항에 대하여 기술하였다.