• Title/Summary/Keyword: Output coupled

Search Result 459, Processing Time 0.023 seconds

Concentric-Circle-Grating Surface Emitting (CCGSE)-DFB Laser with second order grating (Second order grating CCGSE-DFB 레이저 해석)

  • 박해령;김효창;이연호
    • Proceedings of the IEEK Conference
    • /
    • 2000.11b
    • /
    • pp.313-316
    • /
    • 2000
  • Concentric-Circle-Grating (CCG) cavity is analyzed by coupled mode theory. In this case concentric grating is acting as both feedback element and output coupler. In our calculations radiation loss terms are included in guided coupled mode equations. The surface-emitted field distribution is obtained in self-consistent manner.

  • PDF

High Boost Converter Using Voltage Multiplier (배압회로를 이용한 고승압 컨버터)

  • Baek Ju-Won;Kim Jong-Hyun;Ryoo Myung-Hyo;Yoo Dong-Wook;Kim Jong-Soo
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.55 no.8
    • /
    • pp.416-422
    • /
    • 2006
  • With the increasing demand for renewable energy, distributed power included in fuel cells have been studied and developed as a future energy source. For this system, a power conversion circuit is necessary to interface the generated power to the utility. In many cases, a high step-up dc/dc converter is needed to boost low input voltage to high voltage output. Conventional methods using cascade dc/dc converters cause extra complexity and higher cost. The conventional topologies to get high output voltage use flyback dc/dc converters. They have the leakage components that cause stress and loss of energy that results in low efficiency. This paper presents a high boost converter with a voltage multiplier and a coupled inductor. The secondary voltage of the coupled inductor is rectified using a voltage multiplier and series-connected with the boost voltage of primary voltage of the coupled inductor. Therefore, high boost voltage is obtained with low duty cycle. Theoretical analysis and experimental results verify the proposed solutions using a 300W prototype.

Single-Stage Single-Switched AC/DC Converter with Magnetic Coupled Nondissipative Snubber (자기결합 무손실 스너버를 갖는 새로운 고역률 단일전력단 AC/DC 컨버터)

  • 조정욱;문건우;정영석;윤명중
    • Proceedings of the KIPE Conference
    • /
    • 1997.07a
    • /
    • pp.423-431
    • /
    • 1997
  • A new single-stage/single-switched forward converter with magnetic coupled nondissipa-tive snubber is proposed. The proposed converter gives the good power factor correction (PFC), low current harmonic distortion, and tight output voltage regulation. The prototype shows the IEC 555-2 requirements are met satisfactorily with nearly unity power factor. This proposed converter with magnetic coupled nondissipative snubber is particularly suited for low power level power supply applications.

  • PDF

Design of mulimeter-wave ultra-compact broadband MMIC amplifiers (밀리미터파 초소형 광대역 MMIC 증폭기 설계에 관한 연구)

  • 권영우
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.22 no.8
    • /
    • pp.1733-1739
    • /
    • 1997
  • An ultra-compact milimeter-wave broadband MMIC amplifier was designed using a direct-coupled topology combined with optimum feedback design. Significant reductionin the chip size was possible by employing the direct-coupled topology. Bias resistors required for the direct-coupled topology were also used as feedback elements. Feedback was optimized for millimeter-wave frequencies using reactive elements. The fabricated MMIC amplifier was realized in a chip size of 0.8mm$^{[-992]}$ and showed gains higher than 8 dB from 12 to 44 GHz. An output power of 30mW was achieved at 44 GHz with a drain efficiency of 10%.

  • PDF

Comparison of Main Circuit Type Characteristics of LED Driver for Output Ripple Reduction (출력 리플 저감을 위한 LED 드라이버의 주회로 방식 특성 비교)

  • Park, Dae-Su;Kim, Tae-Kyung;Oh, Sung-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.3
    • /
    • pp.491-499
    • /
    • 2019
  • Recently, there has been increasing demand for power quality in power supply devices. The IEC 61000-3-2 standard requires that the AC / DC power supply for lighting meet the specifications for the power factor (PF) and total waveform distortion (THD). In addition, advanced countries in Europe are regulating the ripple rate as 15 ~ 30% for the flicker phenomenon caused by the change in the amount of foot energy due to the change in current of the output terminal. Therefore, domestic standards and regulations are being updated. This study adopted the Flyback converter to satisfy the PFC standard, and has the circuit first and second insulation function. To reduce the low frequency ripple of the LED current, Flyback, Coupled Inductor, LC parallel resonance filter, LLC resonance filter, and Cuk were simulated by PSIM to mimic each LED driving circuit. A coupled LC resonant circuit with a coupled inductor on the primary side and LC resonance on the secondary side was also proposed for output side ripple reduction.

A KY Converter Integrated with a SR Boost Converter and a Coupled Inductor

  • Hwu, Kuo-Ing;Jiang, Wen-Zhuang
    • Journal of Power Electronics
    • /
    • v.17 no.3
    • /
    • pp.621-631
    • /
    • 2017
  • A KY converter integrated with a conventional synchronously rectified (SR) boost converter and a coupled inductor is presented in this paper. This improved KY converter has the following advantages: 1) the two converters use common switches; 2) the voltage gain of the KY converter can be improved due to the integration of a boost converter and a coupled inductor; 3) the leakage inductance of the coupled inductor is utilized to achieve zero voltage switching (ZVS); 4) the current stress on the charge pump capacitors and the decreasing rate of the diode current can be limited due to the use of the coupled inductor; and 5) the output current is non-pulsating. Moreover, the active switches are driven by using one half-bridge gate driver. Thus, no isolated driver is needed. Finally, the operating principle and analysis of the proposed converter are given to verify the effectiveness of the proposed converter.

Class E Power Amplifiers using High-Q Inductors for Loosely Coupled Wireless Power Transfer System

  • Yang, Jong-Ryul;Kim, Jinwook;Park, Young-Jin
    • Journal of Electrical Engineering and Technology
    • /
    • v.9 no.2
    • /
    • pp.569-575
    • /
    • 2014
  • A highly efficient class E power amplifier is demonstrated for application to wireless power transfer system. The amplifier is designed with an L-type matching at the output for harmonic rejection and output matching. The power loss and the effect of each component in the amplifier with the matching circuit are analyzed with the current ratio transmitted to the output load. Inductors with a quality factor of more than 120 are used in a dc feed and the matching circuit to improve transmission efficiency. The single-ended amplifier with 20 V supply voltage shows 7.7 W output power and 90.8% power added efficiency at 6.78 MHz. The wireless power transfer (WPT) system with the amplifier shows 5.4 W transmitted power and 82.3% overall efficiency. The analysis and measurements show that high-Q inductors are required for the amplifier design to realize highly efficient WPT system.

A GPS/DR Integration Kalman Filter with Integration Mode (이중 모드 GPS/DR 통합 칼만필터)

  • Seo, Hung-Seok;Lee, Jae-Ho;Sung, Tae-Kyung;Lee, Sang-Jeon
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.7 no.3
    • /
    • pp.269-275
    • /
    • 2001
  • In land navigation applications, two kinds of GPS/DR integration schemes are commonly used; the loosely-coupled integration scheme and the tightly-coupled one. The loosely-coupled integration filter has a simple structure and is easy to implement. When the number of visible satellites is insufficient, however, it cannot calibrate the errors of the DR sensors. On the contrary the tigthly-coupled integration filter can sup-press the growth of the error in the DR output even when the visibility is poor. However, it has larger com-putation load due to the state dimension and is inconsistent because of the variation in the measurement dimension. This paper presents a GPS/DR integration scheme with dual integration mode. During when the number of visible satellites is sufficient, the proposed scheme operates in a loosely-coupled integration mode. When the visibility becomes poor, it is switched into a tightly-coupled integration mode. Consequently, the pro-posed scheme can calibrate the DR sensors even when the visibility is poor. In addition, its computation time remains constant even if the number of visible satellites increases. Field experiment results show that the performance of the proposed integration method is almost similar to that of the tightly-coupled one.

  • PDF

Asymmetric Cascaded Coupled tine Couplers (비대칭 직렬 연결 결합선로 결합기)

  • Park Myun-Joo;Lee Byungje
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.4 no.2 s.7
    • /
    • pp.67-72
    • /
    • 2005
  • This work proposes a novel coupled line coupler structure based on the asymmetric cascaded connection of coupled lines. The proposed structure can be designed in smaller size than conventional single section coupled line couplers. Also, the additional design freedom offered by the proposed structure can serve many useful purposes such as the output phase control or the flexible coupler layout for complex circuit routing environments.

  • PDF

Power Flow and Efficiency of Input Coupled type CVT combined Differential Gear Unit (차동기어장치를 적용한 입력축 연결방식 무단변속기의 동력흐름 및 효율해석에 관한 연구)

  • Kim, Yeon-Su;Choi, Sang-Hoon
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.11
    • /
    • pp.141-150
    • /
    • 2000
  • Continuously variable transmission(CVT) combined differential gear unit has many advantages, which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral. It is known that such CVT can be classified into the input coupled type and the output coupled type according to the coupling location of continuously variable unit(CVU). In this paper, six different configurations of input coupled type CVT combined V-belt CVU and 2K-H I type differential gear unit are proposed. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed. The propriety of derived formula and theoretical analysis are proven by various experiments.

  • PDF