• Title/Summary/Keyword: operation principle

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Digitalization of the phase Control Circuit of a three-phase Controlled Rectifier (삼상제어력유기 입상 제어회로의 디지털화)

  • 박민호;정승기;김기택
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.36 no.2
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    • pp.107-113
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    • 1987
  • A complete design of a new digital control circuit for a three-phase controlled rectifier is presented. The circuit consists of a gating signal generating ROM, down counter and adder. Proposed scheme is simple and quite adequate to the microprocessor-based digitally controlled systems. The basic principle and operation characteristics of the circuit are described and experimental-results show good dynamic performance. Synchronization problem with noisy reference is also discussed. The basic phylosophy developed can be extended to the other phase control system, e.g., cycloconverters, ac voltoge controllers, etc.

Optical Bistability and Multistability Using Electro-Optic Feedback (전기 광학적 궤환을 이용한 광 쌍안정성과 다 안정성)

  • Lee, Chang-Hee;Cho, Kun-Ho;Shin, Sang-Yung;Lee, Soo-Young
    • Proceedings of the KIEE Conference
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    • 1987.07a
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    • pp.64-67
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    • 1987
  • We demonstrate the optical bistability and multistability using light emitting devices, a photodetector, and transistors under the positive electro optic feedback. Its operating principle and high speed operation Scheme are also described.

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Large-Signal Transient Analysis of a Self-Driven Active-Clamp Forward Converter (자기 구동 능동 클램프 포워드 컨버터의 대신호 과도 특성 해석)

  • Bong Sang-Cheol;Kim Hee-Jun
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1235-1238
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    • 2004
  • This paper presents the large-signal transient analysis of a self-driven active-clamp forward converter, eliminating the extra drive circuit for the active clamp switch. The operation principle of the converter was presented and experiential results were used to verify the analyzed results. A 50-W prototype converter built and tested it. From the tested results, input transient response and load transient response of the converter were established.

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A New-Half Bridge Converter without DC offset of magnetizing current

  • Cho, Kyu-Min;Oh, Won-Sik;Moon, Gun-Woo
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.147-149
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    • 2007
  • A new half bridge converter without DC offset of magnetizing current is proposed. The proposed half bridge converter can realize no DC offset of magnetizing current as well as no circulating current, and guarantee ZVS operation. Therefore it has high efficiency and high power density, especially in wide input range. The operational principle, DC conversion ratio and ZVS analysis are presented. Experimental results demonstrate that the proposed converter can achieve a significant improvement in the efficiency.

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A Study on the ZVZCS Dual TTFC without Primary Freewheeling Diodes (1차측 환류다이오드를 제거한 ZVZCS Dual TIFC에 관한 연구)

  • Han, Kyung-Tae;Kim, Yong;Bae, Jin-Yong;Lee, Eun-Young;Lee, Dong-Hyun
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.1160-1162
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    • 2003
  • This paper presents ZVZCS(Zero-Voltage and Zero-Current Switching) Dual TTFC(Two-Transistor Forward Converter) without primary freewheeling diodes. The principle of operation, feature and design considerations are illustrated and verified through the ecperiment with a 1.8kW 55kHz MOSFET based experimental circuit.

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A Study on the Two Transistor Forward Converter using Synchronous Rectifier (동기정류기를 이용한 Two Transistor Forward 컨버터에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Kwon, Soon-Do;Lee, Kyu-Hoon;Cho, Kyu-Man
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.1163-1165
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    • 2003
  • This paper presents the TTFC(Two Transistor Forward Converter) using Synchronous Rectifier. The principle of operation, feature ana design considerations are illustrated and verified through the experiment with a 200W 100kHz MOSFET based experimental circuit.

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Z-Source Converter with Maximum Boost Voltage Gain

  • Nguyen, Minh-Khai;Jung, Young-Gook;Lim, Young-Cheol
    • Proceedings of the KIPE Conference
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    • 2008.10a
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    • pp.112-114
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    • 2008
  • This paper proposes a new two-stage Z-source converter (TSZC). The purpose of the proposed system is to obtain the ac voltage with a maximum boost voltage for fuel cell applications as a renewable energy source. In order to provide a continuous current path, a switching strategy for the dc-ac ZSI and ac-ac ZSC of the proposed system was used. The operation principle, analysis and simulation results of 1.2 kW fuel cell stack were also presented.

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Development of multi-repetitive Pulse Compression System for excimer laser excitation (엑사이머 레이저 여기용 고반복 펄스압축 시스템 개발에 관한 연구)

  • 전상영
    • Proceedings of the Optical Society of Korea Conference
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    • 1989.02a
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    • pp.36-38
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    • 1989
  • We have developed Magnetic Pulse Compression System to realize repetitive excimer laser excitation. The principle of this system is to use the large change in permiability owing to the nolinear characteristics of ferro-magnetic material (Metglas2605s-2 metal ribon). Prior to the laser operation, the MPC system was tested with a dummy load (5$\Omega$) and laser head. Laser head has a discharge volume of 1.0 (w) x 2.0 (h) x 20.0(1) cm. This MPC system compressed a 6.2us (FWHM), 80 A pulse into a 0.4us(FWHM), 1.3kA pulse.

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Solid Electrochemical Method of Measuring Hydrogen Concentration with O2-/H+ Hetero-Ionic Junction

  • Chongook Park
    • Journal of Sensor Science and Technology
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    • v.33 no.2
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    • pp.63-69
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    • 2024
  • A novel method for measuring hydrogen concentration is introduced, along with its working principle and a novel detection algorithm. This configuration requires no additional reference compartment for potentiometric electrochemical measurements; therefore, it is the most suitable for measuring dissolved hydrogen in the liquid phase. The sensor's electromotive force saturates at a certain point, depending on the hydrogen concentration during the heating process of the sensor operation. This dynamic temperature scanning method provides higher sensitivity than the constant temperature measurement method.

Source Current Control Strategy of Active Power Filters for Unbalanced Load Compensation in Three-Phase Four-Wire Distribution Networks

  • Wang, Lei;Han, Xiaoqing;Meng, Runquan;Ren, Chunguang;Wang, Qi;Zhang, Baifu
    • Journal of Power Electronics
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    • v.18 no.5
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    • pp.1545-1554
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    • 2018
  • This paper proposes a modified control strategy to improve the performance of three-phase four-leg shunt active power filters (APFs) for the compensation of three phase unbalanced loads. Unbalanced current cannot be obtained accurately by a harmonic detector due to the lower frequency. The proposed control strategy eliminates conventional harmonic detectors by directly regulating the source current. Therefore, the computational complexity is greatly reduced and the performance of the APF is improved. A mathematic model has been developed based on the source currents. The corresponding controllers have been designed based on the sinusoidal internal model principle. The proposed control strategy can guarantee excellent compensation performance and stable operation after an extreme disturbance such as a short circuit fault. In addition, the proposed technique can selectively compensate specific harmonics. A 50kVA prototype APF is implemented in the laboratory to validate the feasibility and performance of the proposed control strategy.