• Title, Summary, Keyword: capacitor

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Comparative Analysis of Charging Modes of Series Resonant Converter for an Energy Storage Capacitor (에너지저장 커패시터의 최적 충전을 위한 직렬공진형 컨버터의 운용 모드 비교)

  • Lee, Byung-Ha;Kang, Tae-Sub;Cha, Han-Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.394-400
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    • 2012
  • In this paper, charging modes of series resonant converter for a high voltage energy storage capacitor are compared in terms of charging time, peak resonant current, normalized peak resonant current and voltage in each operation mode. Operating principles of the full bridge series resonant converter with capacitor load are explained and analyzed in discontinuous and continuous operation mode. Based on the analysis and simulation result, $0.6{\omega}_r$ < ${\omega}_s$ < $0.75{\omega}_r$ and $1.3{\omega}_r$ < ${\omega}_s$ < $1.4{\omega}_r$ are evaluated to the best range of switching frequency for charging of an high voltage energy storage capacitor. 1.8 kJ/s SRC prototype is assembled with TI 28335 DSP controller and 40 kJ, 7 kV energy storage capacitor. Design rules based on the comparative analysis are verified by experiment.

Analysis of embedded capacitor using Flexible PCB (Flexible PCB를 이용한 내장형 캐패시터의 분석)

  • Yoo, Joshua;Kim, J.W.;Yoo, M.J.;Park, S.D.;Lee, W.S.;Lee, H.G.;Kang, N.K.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.150-152
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    • 2004
  • The number of layers in rigid PCB(printed circuit board) is restricted, so the number of components can be embedded in module is restricted also. But using flexible multilayer PCB, the layers over than 7 can be evaluated. In this study, to verify the possibility of application of flexible multilayer PCB to RF modules, multilayered embedded capacitor is fabricated and analyzed. The characteristics of embedded capacitor is analyzed and compared to that of MLCC and LTCC capacitor. Embedded capacitor has better electrical features than MLCC and compatible one to LTCC capacitor.

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Predicting the Lifetime of Super-capacitor for DC Traction Regenerative Energy Storage System (직류철도 회생에너지 저장시스템용 슈퍼커패시터 수명예측)

  • Kim, Jong-Yoon;Park, Chan-Heung;Cho, Kee-Hyun;Jang, Su-Jin;Lee, Byoung-Kuk;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • pp.212-214
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    • 2007
  • Regenerative energy which is generated during brake periods of DC traction might cause malfunction or destruction of rectifier or any other power conversion devices caused the increment of DC line voltage. Regenerative energy storage system using super-capacitor is one of the method to control the DC line voltage safely. And super-capacitor is very important device as energy storage device. Therefore, In this paper, we designed the regenerative energy storage system using super-capacitor and propose the method about predicting the lifetime of super-capacitor established in storage system. According to the this research, we can estimate the proper replacement moment for the existed super-capacitor due to the safety of the system. And improve the reliability of regenerative energy storage system using super-capacitor.

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Steady-State Characteristics of Resonant Switched Capacitor Converters

  • Shoyama Masahito;Deriha Fumitoshi;Ninomiya Tamotsu
    • Journal of Power Electronics
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    • v.5 no.3
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    • pp.206-211
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    • 2005
  • Conventional switched capacitor converters have an inherent drawback that their efficiency decreases as the output current increases. This inherent drawback is due to a periodical forced charging and discharging operation in the internal switched capacitors accompanied by a large capacitor current. Their efficiency can not be increased by decreasing its internal resistance. As a result, conventional switched capacitor converters have been limited to uses with a very small output current. To solve this problem we presented a novel switched capacitor converter topology that uses a resonant operation instead of the forced charging and discharging operation. Its advantage over a conventional switched capacitor converter is higher efficiency even in a high output current region. In this paper, the operation analysis and steady-state characteristics are described in detail for a half buck type switched capacitor converter, and they are confirmed by experimentation.

Operating Characteristics in LCLC Resonant Converter with A Low Coupling Transformer. (낮은 커플링 변압기를 갖는 LCLC 공진컨버터 동작특성)

  • Kong Young-Su;Kim Eun-Soo;Lee Hyun-Kwan;Cho Jung-Goo;Kim Yoon-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.7
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    • pp.343-350
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    • 2005
  • Conventionally, for transferring the primary power to the secondary one, the high frequency series resonant converter has been widely used for the contactless power supply system. However, the high frequency series resonant converter has the disadvantages such as the low efficiency, the high voltage gain characteristics and deviation of the phase angle in the overall load range. To improve this disadvantages, In this paper, the characteristics of the high efficiency and unit voltage gain as well as in-phase are revealed in the proposed three-level LCLC (Inductor-Capacitor- Inductor-Capacitor) resonant converter. The results are verified on the simulation based on the theoretical analysis and the 4kW experimental Prototype.

Development of a DC Pulse Atmospheric Micro Plasma using a Voltage Doubled Capacitive Ballast

  • Ha, Chang-Seung;Cha, Ju-Hong;Kim, Dong-Hyeon;Lee, Hae-Jun;Lee, Ho-Jun
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.157.1-157.1
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    • 2013
  • 외부 Ballast Capacitor를 이용한 Voltage Doubler 전원장치를 이용하여 Micro size의 대기압 플라즈마를 발생장치를 개발하였다. 2개의 외부 Capacitor를 병렬로 연결하여 충전한 다음 외부 Capacitor를 직렬로 연결하여 전압을 2배압 시킨 상태에서 방전이 일어나도록 하였다. Capacitor의 충 방전 제어는 Switch Device인 Insulated Gate Bipolar Transistor (IGBT)를 사용하였다. 개발된 대기압 플라즈마는 외부 Capacitor와 인가전압을 독립적으로 변화시킬 수 있기 때문에 방전 시 전류 전압을 독립적으로 제어할 수 있으며 용도에 따라 Glow 방전에서 Arc 방전까지 제어가 가능하다. 본 연구에서는 900 V의 1.22 nF 외부 Capacitor 방전과 400 V의 10 nF 외부 Capacitor 방전을 비교하였다. 방전 시 전압파형과 전류파형은 서로 다르지만 소비된 방전에너지는 340 ${\mu}J$로 동일하다. ICCD camera와 Spectrometer를 이용하여 비교 분석을 실시하였다. 방전 image 및 Optical Emission Spectroscopy 분석을 이용하여 플라즈마의 온도, 밀도 등을 시간적, 공간적으로 분석하였다.

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Deterioration Diagnosis of Electrolytic Capacitor in Motor Drive System using the System using the System ID Method (시스템 식별론을 이용한 드라이브 시스템에서의 전해 콘덴서 결함 진단)

  • 김준석;송홍석;남광희
    • Proceedings of the KIPE Conference
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    • pp.243-247
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    • 1999
  • An electrolytic capacitor is widely used in a motor drive system. Therefore, the deterioration diagnosis of an electrolytic capacitor is needed of preventive maintenance of the system. In this paper, we propose a new diagnosis method for the electrolytic capacitor by using the system identification method, which presents the information about the capacitor's interna parameters in on-line operation an use fuzzy algorithm for the deterioration decision. We demonstrated the effectiveness of the proposed control scheme by using computer simulation.

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IMPROVEMENTS OF SWITCHED-CAPACITOR NETWORKS TO THE PERFORMANCE OF SWITCHING DC-DC CONVERTERS

  • Liu, Jian;Chen, Zhiming;Yan, Baiping
    • Proceedings of the KIPE Conference
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    • pp.197-200
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    • 1998
  • Three switched-capacitor(SC) networks are presented including series-parallel capacitor set, reversed-switched-capacitor network and push-pull switched-capacitor network, the performances of which are discussed. Combining the SC networks with traditional DC-DC converters, we form several new topologies. Experiment and analyzed results show that the behavior of a DC-DC converter with large voltage ratio can be improved. A wider voltage conversion range is also obtained.

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