• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.674-677
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• 2000

Operational principles and driving characteristics of two well-known energy recovery circuits for ac plasma display panels Weber and Sakai circuits are investigated Efficiency of two circuits is analyzed by comparing the in put current of the circuits with different operating conditions. Driving characteristics of the Weber circuit are studied when the magnitude and pulse width of the driving boltage very.

• Journal of electromagnetic engineering and science
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• 제13권1호
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• pp.54-61
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• 2013

An equivalent model has been developed to estimate the electromagnetic immunity for integrated circuits under a complex electromagnetic environment. The complete model is based on the characteristics of the equipment and physical configuration of the device under test (DUT) and describes the measurement setup as well as the target integrated circuits under test, the corresponding package, and a specially designed printed circuit board. The advantage of the proposed model is that it can be applied to a SPICE-like simulator and the immunity of the integrated circuits can be easily achieved without costly and time-consuming measurements. After simulation, measurements were performed to verify the accuracy of the equivalent model for immunity prediction. The improvement of measurement accuracy due to the added effect of a bi-directional coupler in the test setup is also addressed.

• Journal of Power Electronics
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• 제6권2호
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• pp.114-120
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• 2006

This paper compares two types of direct torque controllers for permanent magnet synchronous motors(PMSMs). These controllers both use a single-chip FPGA(Field Programmable Gate Array) but have differing hardware configurations. One of the controllers was constructed by programming a soft-core CPU and hardware logic circuits written in VHDL(Very high speed IC Hardware Description Language), while the other was constructed of only hardware logic circuits. The characteristics of these two controllers were compared in this paper. The results show the controller constructed of only hardware logic circuits was able to shorten the control period and it was able to suppress the low torque ripple.

• 전자공학회논문지C
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• 제34C권5호
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• pp.1-17
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• 1997

With the increasing performance and density of VLSI scircuits as well as the popularity of portable devices such as personal digital assitance, power consumption has emerged as an important issue in the design of electronic systems. Low power design techniqeus have been pursued at all design levels. However, it is more effective to attempt to reduce power dissipation at higher levels of abstraction which allow wider view. In this paper, we propose a simultaneous scheduling and binding scheme which increases the correlation between cosecutive inputs to an operation so that the switched capacitance of execution units is reduced in datapath-dominated circuits. The proposed method is implemented and integrated into the scheduling and assignment part of HYPER synthesis environment. Compared with original HYPER synthesis system, average power saving of 23.0% in execution units and 14.2% in the whole circuits, ar eobtained for a set of benchmark examples.

• 전력전자학회논문지
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• 제14권5호
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• pp.406-414
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• 2009

본 논문에서는 전원장치의 고집적화와 저가격화를 위해 두 개의 공진커패시터와 두 개의 변압기로 구성된 독립된 공진탱크회로를 갖는 LLC 공진 컨버터를 제안하였다. 제안된 공진회로에 적용된 두개의 변압기는 각 변압기에 흐르는 전류 불평형문제를 저감하기 위해 1차 측은 병렬 연결되어 있고 2차 측은 상호 직렬 연결되어 있다. 300W 시제품을 제작 실험한 결과를 통해 제안된 LLC 공진컨버터가 적용 가능함을 나타냈다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.30-33
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• 2000

Using power semiconductor switches such as IGBTs diodes and L-C circuits novel repetitive impulse voltage generator is developed. In the presented circuits high voltage pulse is generated by series-connection of capacitors and IGBTs. The charging of capacitors and voltage balance of IGBTs is done automatically. To verify the proposed circuit 20kV, 300A pulse generator is manufactured and tested.

• Journal of Power Electronics
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• 제2권2호
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• pp.124-129
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• 2002

Invertigation electromagnetic emissione of inverter power sources resistance welding existing special aspects of EMI measurements in the field of resistance welding machines resulting from the power rating and operation mode of these machines have to be taken into account. The characteristics of the internal switching processes determined by the behavior of the applied power semiconductors, sunbber circuits and constructional aspect exert a great influence on the conducted emission welding inverters.

• Journal of Power Electronics
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• 제11권5호
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• pp.632-638
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• 2011

This paper presents a cascaded coil flux control based on a Current Source Parallel Resonant Push-Pull Inverter (CSPRPI) for Induction Heating (IH) applications. The most important problems associated with current source parallel resonant inverters are start-up problems and the variable response of IH systems under load variations. This paper proposes a simple cascaded control method to increase an IH system's robustness to load variations. The proposed IH has been analyzed in both the steady state and the transient state. Based on this method, the resonant frequency is tracked using Phase Locked Loop (PLL) circuits using a Multiplier Phase Detector (MPD) to achieve ZVS under the transient condition. A laboratory prototype was built with an operating frequency of 57-59 kHz and a rated power of 300 W. Simulation and experimental results verify the validity of the proposed power control method and the PLL dynamics.

• 전자공학회논문지SC
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• 제38권2호
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• pp.50-55
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• 2001

저 전력을 소모하는 새로운 방식의 논리회로를 설계하여 이의 성능실험을 위해 패리티체커를 구성하여 시뮬레이션 하였다. 기존의 저전력 소모용으로 설계된 논리회로(CPL, DPL, CCPL 등)들은 패스 트랜지스터를 통과하면서 약해진 신호를 풀 스윙 시키기 위해서 인버터를 사용하는데, 이 인버터가 전력소모의 주원인이 되고 있음이 본 논문에서 시뮬레이션 결과 밝혀졌다. 따라서 본 본문에서는 인버터를 사용하지 않고 신호를 풀스윙 시킬 수 있는 회로를 고안하였다. 기존의 CCPL게이트로 구성한 패리티체커에 비해 본 논문에서 제안한 게이트로 구성된 것이 33%의 전력을 적게 소모하는 것으로 시뮬레이션 결과 나타났다.

• 한국광학회지
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• 제15권6호
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• pp.490-494
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• 2004

평면도파로 (Planar Lightwave Circuits)를 수소처리한 후 격자를 제작하였다. 성장특성 분석 결과 격자는 거듭제곱식 (power law)에 따라서 성장되는 것을 알 수 있었다. 격자의 성장특성을 이용하여 외부 공진기 레이저용 평면도파로 격자를 설계하고 제작한 결과 예상치와 거의 일치하는 격자특성을 얻을 수 있었고, 제작된 격자로 구현된 외부 공진기 레이저에서 ∼40dB의 인접모드억압비(side mode suppression ratio)를 갖는 단일모드 발진을 관측할 수 있었다.