• 제목/요약/키워드: Active Inductor

검색결과 164건 처리시간 0.03초

마이크로그리드 독립 운전 모드시 저전압 불평형 선로 임피던스를 고려한 드룹 방식의 인버터 병렬 운전 제어 연구 (Droop Control for Parallel Inverers in Islanded Microgrid Considering Unbalanced Low-Voltage Line Impedances)

  • 임경배;최재호
    • 전력전자학회논문지
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    • 제18권4호
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    • pp.387-396
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    • 2013
  • This paper investigates the droop control of parallel inverters for an islanded mode of microgrid. Frequency and voltage droop control is one of power control and load demand sharing methods. However, although the active power is properly shared, the reactive power sharing is inaccurate with conventional method due to the unequal line impedances and the power coupling of active - reactive power. In order to solve this problem, an improved droop method with virtual inductor concept and a voltage and current controller properly designed have been considered and analyzed through the PSiM simulation. The performance of improved droop method is analyzed in not only low-voltage line but also medium voltage line.

A New Active Clamp Forward Converter Using Secondary Inductor Current Ripple for Improved ZVS Operation

  • Lee Sung-Sae;Han Sang-Kyoo;Moo Gun-Woo
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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    • pp.615-619
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    • 2004
  • A new asymmetrical zero voltage switching (ZVS) active clamp forward converter is proposed. Since the ripple current of secondary inductor plays a key role in the ZVS operation of main power switch, the proposed converter shows an excellent ZVS performance. The synchronous rectification is employed to reduce the rectification loss. The operational principle and ZVS analysis are presented. Experimental results demonstrate that the proposed converter can achieve an excellent ZVS performance throughout all load conditions and the significant improvement in the efficiency for the 100W(5V,20A) prototype converter.

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Output inductor-less active clamp forward converter employing current boost-up circuit for high power density adaptor

  • Lee, Keun-Wook;Choi, Seong-Wook;Lee, Byoung-Hee;Moon, Gun-Woo
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2008년도 하계학술대회 논문집
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    • pp.403-405
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    • 2008
  • This paper proposes an output inductor-less active clamp forward converter employing current boost-up circuit for high power density adaptor. By applying the proposed current boost-up circuit, the proposed converter has low conduction loss and low voltage ringing of the secondary rectifier. This paper presents the analysis of the proposed converter and a comparison between the proposed converter and the conventional converter through experiment.

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단일 보조 스위치를 이용한 ZC-ZVS PWM DC-DC 컨버터 (ZC-ZVS PWM DC-DC Converter using One Auxiliary Switch)

  • 박진민;박영조;서기영;문상필;김영문
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 학술대회 논문집 전문대학교육위원
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    • pp.158-161
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    • 2003
  • A new soft switching technique that improves performance of the high power factor boost rectifier by reducing switching losses is introduced. The losses are reduced by air active snubber which consists of an inductor, a capacitor a rectifier, and an auxiliary switch. Since the boost switch turns off with zero current, this technique is well suited for implementations with insulated gate bipolar transistors. The reverse recovery related losses of the rectifier are also reduced by the snubber inductor which is connected in series with the boost switch and the boost rectifier. In addition, the auxiliary switch operates with zero voltage switching. A complete design procedure and extensive performance evaluation of the proposed active snubber using a 1.2[kW] high power factor boost rectifier operating from a $90[V_{rms}]$ input are also presented.

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A Design of LC-tuned Sinusoidal VCOs Using OTA-C Active Inductors

  • Chung, Won-Sup;Son, Sang-Hee
    • 전기전자학회논문지
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    • 제11권3호
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    • pp.122-128
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    • 2007
  • Sinusoidal voltage-controlled oscillators (VCOs) based on Colpitts and Hartley oscillators are presented. They consist of a LC parallel-tuned circuit connected in a negative-feedback loop with an OTA-R amplifier and two diode limiters, where the inductor is simulated one realized with temperature-stable linear operational transconductance amplifiers (OTAs) and a grounded capacitor. Prototype VCOs are built with discrete components. The Colpitts VCO exhibits less than 1% nonlinearity in its current-to-frequency transfer characteristic from 4.2 to 21.7 MHz and ${\pm}$95 ppm/$^{\circ}C$ temperature drift of frequency over 0 to $70^{\circ}C$. The total harmonic distortion (THD) is as low as 2.92% with a peak-to-peak amplitude of 0.7 V for a frequency-tuning range of 10.8-32 MHz. The Hartley VCO has the temperature drift and THD of two times higher than those of the Colpitts VCO.

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An Efficiency-Optimized Modulation Strategy for Dual-Active-Bridge DC-DC Converters Using Dual-Pulse-Width-Modulation in the Low Power Region

  • Byen, Byeng-Joo;Ban, Chung-Hwan;Lim, Young-Bae;Choe, Gyu-Ha
    • Journal of Power Electronics
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    • 제17권6호
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    • pp.1413-1421
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    • 2017
  • In order to control the output voltage in a dual active bridge converter, this paper establishes a theoretical inductor current equation for a dual-pulse-width-modulation scheme that ensures low switching loss. It also proposes a modulation strategy that minimizes conduction loss. When compared to the conventional single-pulse-width-modulation strategy, the proposed approach can reduce the inductor current RMS and improve efficiency in the low power region, as verified through simulation and experimental results.

최적화된 나선형 인덕터를 이용한 이동 통신용 저잡음. 저전력 2㎓ CMOS VCO 설계에 관한 연구 (A 2㎓, Low Noise, Low Power CMOS Voltage-Controlled Oscillator Using an Optimized Spiral Inductor for Wireless Communications)

  • 조제광;이건상;이재신;김석기
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 1999년도 추계종합학술대회 논문집
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    • pp.283-286
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    • 1999
  • A 2㎓, low noise, low power CMOS voltage-controlled oscillator (VCO) with an integrated LC resonator is presented. The design of VCO relies heavily on the on-chip spiral inductor. An optimized spiral inductor with Q-factor of nearly 8 is achieved and used for the VCO. The simulated result of phase noise is as low as -l14 ㏈c/Hz at an offset frequency of a 600KHz from a 2㎓ carrier frequency. The VCO is tuned with standard available junction capacitors, resulting in an about 400MHz tuning range (20%). Implemented in a five-metal 0.25${\mu}{\textrm}{m}$ standard CMOS process, the VCO consumes only 2㎽ from a single 2.5V supply. It occupies an active area of 620${\mu}{\textrm}{m}$$\times$720${\mu}{\textrm}{m}$.

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A Novel Grounded Inductor Realization Using a Minimum Number of Active and Passive Components

  • Yuce, Erkan;Minaei, shahram;Cicekoglu, Oguzhan
    • ETRI Journal
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    • 제27권4호
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    • pp.427-432
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    • 2005
  • In this study, we present a new topology for realizing a grounded inductor employing only a single current conveyor, called a negative-type modified inverting second-generation current conveyor (MICCII-), and a minimum number of passive components, two resistors, and one capacitor. The non-ideality effects of the MICCII- on a simulated inductor are investigated. To demonstrate the performance of the presented inductance simulator, we use it to construct a third order Butterworth high-pass filter and a parallel resonant circuit. Simulation results are given to confirm the theoretical analysis.

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Double Two Switch Forward Transformer-Linked Soft-Switching PWM DC-DC Power Converter with Tapped Inductor Filters

  • Moisseev Serguei;Koudriavtsev Oleg;Hiraki Eiji;Nakamura Mantaro;Nakaoka Mutsuo;Hamada Satoshi
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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    • pp.193-197
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    • 2001
  • This paper presents a novel circuit topology of the double two-switch forward type high frequency transformer linked soft-switching PWM DC-DC power converter with tapped inductor filters that can operate under a condition of the low peak voltage stress across the power semiconductor devices and lowered peak current stress through the transformer for some high power applications. This circuit topology of an interleaved two-switch forward soft-switching power converter is proposed in the order to minimize an idle circulating current due to the tapped inductor filter without of any additional active auxiliary resonant-assisted snubber circuits, such as active resonant DC link snubbers and AC link snubbers, active resonant commutation leg link snubbers. The unique advantages of this power converter are less power circuit components and power semiconductor devices, constant frequency PWM scheme, cost effective configuration and wider soft-switching PWM operation range under PWM power regulations load variations. The practical effectiveness of the proposed soft-switching converter circuit topology is tested by simulations and is proved by experimental results received from the 500W-100kHz breadboard setup.

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능동 인덕터를 이용한 0.15-㎛ GaAs pHEMT 기반 W-대역 VCO 설계 (A W-band Compact and Wideband VCO Using Active Inductor in 0.15-㎛ GaAs pHEMT Technology)

  • 김동교
    • 전기전자학회논문지
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    • 제28권3호
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    • pp.445-450
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    • 2024
  • 본 논문에서는 0.15-㎛ GaAs pHEMT 공정을 이용하여 설계된 버랙터 없는 W-band(75-110 GHz) 전압제어 발진기(VCO)를 소개한다. 능동 인덕터를 활용하여 버랙터 없는 주파수 조절을 구현하였으며 능동 인덕터 회로는 게이트가 종단된 공통 게이트 스테이지를 이용하였다. 해당 능동 인덕터는 시뮬레이션 결과 기존의 버랙터 다이오드와 비교하여 넓은 주파수 조절 범위와 높은 Q-인자를 갖는다. 발진기 코어는 소스 피드백이 포함된 Colpitts 구조를 사용하였다. 구현된 버랙터 없는 W-band VCO의 측정 결과 88 GHz에서 5.7 dBm의 높은 출력 전력과 5.8 %의 주파수 조절 범위를 얻었으며 이 때 dc 전력 소모는 146 mW였다. 또한 해당 회로는 컴팩트한 레이아웃 디자인을 통해서 0.48 mm2의 작은 사이즈로 구현되었다.