• 제목/요약/키워드: Active Inductor

검색결과 164건 처리시간 0.028초

수동형 필터 적용시 무효전력의 변화에 관한 연구 (Study on the Variation of Reactive Power When Applying the Passive Filter)

  • 김지명;김종겸
    • 전기학회논문지
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    • 제65권9호
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    • pp.1626-1631
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    • 2016
  • Generally, the low-voltage customer has been used with a linear load and nonlinear load in the 3-phase 4-wire distribution system. Linear load has usually configured the resistance and inductance, current phase is slower than the voltage phase, so power factor is low. It is required for the power factor correction device prior to the phase of the current than the voltage. The capacitor is connected in parallel to the load in order to ensure a low power factor. Power converter such as an inverter is a typical non-linear load. Non-linear load generates harmonic currents in the energy conversion process. Many electrical equipment may be adversely affected by the harmonic current. There, passive or active filter have been used to reduce these harmonics current. Passive filter consisting of inductor and capacitor generates a reactive power. According to the combination of filter inductor and capacitor, reactive power can be adjusted. In this paper, we analyzed how the combination of inductor and capacitor affects the overall power factor by simulation and measurement.

보조 인덕터와 보조 다이오드를 적용한 소프트-스위칭이 가능한 포워드-플라이백 컨버터에 관한 연구 (A Study on the Soft-Switching Forward-Flyback Converter Using Auxiliary Inductor and Auxiliary Diode)

  • 이아라;박준우;홍성수
    • 전력전자학회논문지
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    • 제22권2호
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    • pp.140-149
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    • 2017
  • This study proposes a new type of active-clamp forward-flyback converter with two transformers that operate in forward and flyback modes during on and off times, respectively, instead of not using an output inductor. The main switch can be turned on with zero-voltage switching (ZVS) using the leakage inductance of the transformer and the output capacitor of the main switch. The leakage inductance should be increased to ZVS. However, the ringing between the leakage inductance of the transformer and the parasitic output capacitance of the secondary side rectifier switches results in a serious voltage spike. A forward-flyback converter employing auxiliary inductor and auxiliary diode is proposed to overcome the problem. The operational principles are analyzed in detail and validated through experiments with a 385 V-to-53 V/37 A prototype.

역률 개선 컨버터용 고차 능동 필터의 설계 및 분석 (Design and Analysis of High-order Active Input Filter for Power Factor Correction(PFC) Converter)

  • 이동영;조보형
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 A
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    • pp.259-261
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    • 1996
  • In this paper, active input filter for power factor correction(PFC) circuit employing ripple arrent and voltage cancellation is proposed to reduce filter's size and cost, and to make filter design easy. Switching ripple current and voltage can be sensed through the secondary windings of filter inductor. Single stage passive filter can achieve high order filter characteristics by using active ripple current and voltage cancellation technique. Conventional high order passive filter and its problems are suggested. Analysis of active filter and design procedure are detailed. Simulation result is presented to verify high order filter characteristics of proposed scheme.

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액티브 클램프 포워드 컨버터의 출력 리플 저감에 관한 연구 (A Study on the output ripple reduction of Active-Clamp Forward Converter)

  • 정재엽;김용;배진용;권순도;최근수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 제40회 하계학술대회
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    • pp.963_964
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    • 2009
  • This paper presents an output ripple reduction of Active-Clamp Forward Converter, which is mainly composed of interleaving two active-clamping forward converters. By interleaving, Output ripple is reduced. The leakage inductance of the transformer or an additional resonant inductance is employed to achieve ZVS during the dead times. The duty cycles are not limited to be equal and within 50%. The complementary switching and the resulted interleaved output inductor currents diminish the current ripple in output capacitors. Accordingly, the smaller output chokes and capacitors lower the converter volume and increase the power density. Detailed analysis of this ouput reduction of Active-Clamp Forward Converter is described.

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인터리브 방식을 이용한 액티브 클램핑 포워드 컨버터에 관한 연구 (A Study on the Interleaved Active-Clamping Forward Converter)

  • 정재엽;김용;권순도;배진용;이동현
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 춘계학술대회 논문집 에너지변화시스템부문
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    • pp.156-160
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    • 2009
  • This paper presents the interleaved active-clamping ZVS(Zero Voltage Switching) forward converter, which is mainly composed of two active-clamping forward converters. Only two switches are required, and each one is the auxiliary switch for the other. The circuit complexity and cost are thus reduced. The leakage inductance of the transformer or an additional resonant inductance is employed to achieve ZVS during the dead times. The duty cycles are not limited to be equal and within 50%. The complementary switching and the resulted interleaved output inductor currents diminish the current ripple in output capacitors. Accordingly, the smaller output chokes and capacitors lower the converter volume and increase the power density. Detailed analysis and design of this new interleaved active-clamping forward converter are described.

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EM 시뮬레이터를 이용한 LNA 설계 (Design of LNA Using EM simulator)

  • 최문호;김영석;정성일;이한영;장석환;이종악
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2005년도 추계종합학술대회
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    • pp.873-876
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    • 2005
  • A low noise amplifier(LNA) using electro-magnetic field simulator is designed in standard 0.25um CMOS process. Integrated spiral inductor is simulated using EM field solver. Then LNA is simulated with active device, capacitor and simulated inductor by EM field solver. A S11 and S21 of -15.45dB and 17.8dB at 2.3GHz as simulation results was achieved. A Noise Figure is 2.92dB. And Measurements show a S11 and S21 of -12.4dB and 17.8dB at 2.3GHz. A Noise Figure of 3.3dB was achieved.

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High Step-Up Converter with Hybrid Structure Based on One Switch

  • Hwu, K.I.;Peng, T.J.
    • Journal of Electrical Engineering and Technology
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    • 제10권4호
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    • pp.1566-1577
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    • 2015
  • A novel high step-up converter is presented herein, which combines the conventional buck-boost converter, the charge pump capacitor and the coupling inductor. By doing so, a quite high voltage conversion ratio due to not only the turns ratio but also the duty cycle, so as to increase design feasibility. It is noted that the denominator of the voltage conversion ratio is the square of one minus duty cycle. Above all, there is no voltage spike across the switch due to the leakage inductance and hence no passive or active snubber is needed, and furthermore, the used switch is driven without isolation and hence the gate driving circuit is relatively simple, thereby upgrading the industrial application capability of this converter. In this paper, the basic operating principles and the associated mathematical deductions are firstly described in detail, and finally some experimental results are provided to demonstrate the effectiveness of the proposed high step-up converter.

High-Q MEMS Spiral Inductor를 이용한 RF VCO (RF VCO with High-Q MEMS-based Spiral Inductor)

  • 김태호;김경만;서희원;황인석;김삼동
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2003년도 하계종합학술대회 논문집 II
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    • pp.987-990
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    • 2003
  • This paper presents a cross-coupled RF VCO with high-Q MEMS-based spiral inductors. Since the use of high-Q inductors is critical to VCO design, MEMS-based spiral inductors with the Q-factor of nearly 22 are used for the RF VCO with an active cascode current source. The RF VCO circuits including spiral inductors have been designed and simulated in GaAs MMIC-MEMS process. The simulation results of the VCO circuits showed the phase noise of -180dBc/Hz at an offset frequency of 500KHz. The RF VCO circuit simulatinon used 2mA DC current and 3.3V supply.

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고효율을 갖는 단일 전력변환 직렬 공진형 AC-DC 컨버터 (Single-Power-Conversion Series-Resonant AC-DC Converter with High Efficiency)

  • 정서광;차우준;이성호;권봉환
    • 전력전자학회논문지
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    • 제21권3호
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    • pp.224-230
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    • 2016
  • In this study, a single-power-conversion series-resonant ac-dc converter with high efficiency and high power factor is proposed. The proposed ac-dc converter consists of single-ended primary-inductor converter with an active-clamp circuit and a voltage doubler with series-resonant circuit. The active-clamp circuit clamps the surge voltage and provides zero-voltage switching of the main switch. The series-resonant circuit consists of leakage inductance $L_{lk}$ of the transformer and resonant capacitors $ C_{r1}$ and $ C_{r2}$. This circuit also provides zero-current switching of output diodes $D_1$ and $D_2$. Thus, the switching loss of switches and reverse-recovery loss of output diodes are considerably reduced. The proposed ac-dc converter also achieves high power factor using the proposed control algorithm without the addition of a power factor correction circuit and a dc-link electrolytic capacitor. A detailed theoretical analysis and the experimental results for a 1kW prototype are discussed.

Current Doubler 정류기를 이용한 능동클램프형 포워드 컨버터 (An Active Clamp Forward Converter with a Current Doubler Rectifier)

  • 어성준;최재호;안태영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 F
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    • pp.2020-2022
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    • 1997
  • An active clamp forward converter is proper for minimization and basically makes high efficiency of the system because of soft switching type. Especially, when applied to forward converter, it widens the control range of duty ratio and is suitable for high input voltage. In other hand, the current doubler has high utility efficiency of transformer and reduces output current ripple because it always transfers the power through the transformer and has two inductor with opposite slope. So, this paper explained the conduction mode of an active clamp forward converter with the current doubler rectifier.

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