• Title/Summary/Keyword: LC Resonant Circuit

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The Analysis of Dual Resonant Iris for Designing Waveguide Band-Pass Filter (대역 통과 도파관 여파기 설계를 위한 이중 공진 아이리스 해석)

  • Choi, Jin-Young;Kim, Byung-Mun;Cho, Young-Ki
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.9
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    • pp.904-911
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    • 2011
  • This paper deals with transmission characteristics of a new dual resonant structure for designing waveguide band-pass filter. The structure which has a pass-band between two adjacent stop-bands in a single body consists of circular ridged aperture and four armed conducting patch. The dual resonant behavior of the structure can be represented by a combination of LC series and parallel resonant circuits. Also these resonant properties can be easily controlled by varying the geometry of the aperture and four armed conducting patch. Actually, the structure is fabricated on the microstrip substrate by use of etching technique so that it is formed an iris type resonator which can be easily put into the transverse plane of the waveguide. We use WR-90 standard waveguide, adapters, and VNA(vector network analyzer) to measure the resonant characteristics of the structure. It is very useful to design and to improve the cutoff skirts characteristics in the waveguide band-pass filter design area.

Reduction of Noise for Switched Reluctance Motor With Modified dual-decay Circuit (변형된 dual-decay 회로를 이용한 SRM의 소음 저감)

  • 오재윤;임준영;김형섭;정달호
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.185-188
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    • 1998
  • The recent flurry of activities and interest in Switched Reluctance Motor(SRM) has focused attention on various issues associated with implementing the SRM in the mass commertial Market. One such issue is the noise generated by radial force. In this paper, we proposed the circuit to reduce the noise of SRM using LC Resonant characteristic. The usefulness of proposed circuit is verified by experimental result.

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Cycloconverters with Resonant Circuits for Induction Motor Drives (기진회로를 이용한 사이크로콘버터에 의한 유도전동식 구동)

  • 김영석;조규민
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.41 no.2
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    • pp.125-134
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    • 1992
  • This paper presents a cycloconverter with an LC resonant circuit for an induction motor drive. The cycloconverter can keep input displacement factor at 1.0 by independently controlling real and reactive power under any load conditions. Furthermore it can keep power factor at about 1.0 since input and output current waveforms are nearly sinusoidal. Since it uses high frequency resonant circuit for commutation source, it can produce an output voltage of hundreds of hertz. Since it is also possible to make a system of high capacity using the cycloconverter, it is appropriate to drive motors with high speed and high capacity as well as general purpose motors, In this paper, we describe the operating principles of the cycloconverter and power control algorithms, and analyze its waveforms and present its characteristics. Expermental results are shown for the volts/hertz control of the induction motor and the validity of the proposed model is verified.

Telemetry Silicon Pressure Sensor Using LC Resonance (LC 공진을 이용한 원격측정용 실리콘 압력센서)

  • Kim, Soon-Young;Pak, Jean-Sung;Yang, Sang-Sik
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.2254-2256
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    • 2000
  • This paper presents an implantable telemetry LC resonance-type pressure sensor for the measurement of the ventricle pressure. This sensor consists of a capacitor and an inductor. This resonant circuit is magnetically coupled with an external antenna coil. The resonance frequency of the circuit decreases as the sensor capacitance is increased by the applied pressure. The inductance and the capacitance are 428nH and 0.98${\mu}F$, respectively. The resonance frequency is 245.7MHz when the differential pressure is zero. The sensitivity of the sensor is 9.477kHz/Pa.

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External Resonant Ignitior for HID Lamps by Using the Transformer (변압기를 이용한 외장형 HID 램프용 공진형 이그니터)

  • Lee, Woo-Cheol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.11
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    • pp.9-16
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    • 2014
  • The electronic ballast for HID lamps needs high ignition voltage which is consisted of high voltage pulse ignitor. However, In the case of street lamp it is far from a lamp to a ballast, the conventional pulsed high voltage ignitor can not turn on the HID lamps because of reduction of ignition voltage. Therefore, it needs to do the research on a resonant ignition to turn on the HID lamps. However, the resonant circuit which is consisted of LC occurs over current, so the capacity of the ignitor increases. The capacity of the ignitor can be reduced by using the transformer. In this case, the capacitor for resonance is installed to the secondary of the transformer, and the capacitor needs high withstanding voltage. Therefore, it needs to do the research on a resonant ignition to reduce the voltage over the resonant capacitor by dividing the secondary of the transformer.

Comparison of HFLC Series Compensator and HFLC Shunt Compensator (공진형 콘버터를 이용한 직렬보상기와 병렬보상기의 비교 연구)

  • Chung, Gyo-Bum
    • Proceedings of the KIEE Conference
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    • 1995.07b
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    • pp.468-470
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    • 1995
  • In this paper, a series compensator with a resonant LC circuit and a shunt compensator with the resonant circuit are compared based on the respective rating of its circuit elements. The rating are calculated over a range of compensation and over a range of bus angle. The components ratings are expressed in a per unit values. The results of this study can be easily converted to actual MVA by a simple change in scale. The methodology presented to rate the various components within the system will help to determine the feasibility of various FACTS devices in costs.

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A Design of Electronic Ballast for 400[W] High Pressure Sodium Lamp Using IsSPICE (IsSPICE를 이용한 400[W] 고압나트륨 램프용 전자식 안정기 설계)

  • Kong, Eung-Seok;Shin, Dae-Chul;Choi, Choung-Moon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.5
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    • pp.27-34
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    • 2004
  • In this paper, we designed the electronic ballast for the 400[W] hight pressure sodium lamp using the half-bridge inverter Inductance and capacitance in the proposed equivalent LC series resonant circuit are calculated theoretically. We performed the simulation of the LC series half-bridge inverter circuit using the IsSPICE and the electronic ballast for the high pressure sodium lamp were implemented for verifing the simulation results. In the experimental results, the specification of the implemented electronic ballast are almost same with the simulated one. The experimental results show the good performance as PF 99.3[%], $A_{THD}$ 10.01[%], lamp efficiency 119[lm/W] at the output 400[W].].

Characteristic Analysis of Reactive-Power Compensator using Resonant Current-Source Inverter by simplification model (축소모형에 의한 공진형 전류원 인버터식 무효전력보상기의 특성 분석)

  • 한병문;백승택;박덕희;소용철
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.269-274
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    • 1998
  • This paper describes a scaled model for PWM thyristor current-source inverter with a commutation circuit. The system consists of a 6-pulse thyristor bridge and an LC resonant circuit with thyristor switches, which offers thyristors to have turn-off capability for PWM operation with minimal switching losses. The proposed system can be used as a reactive power compensator with PWM operation for the utilitity application. There would be two advantages in the proposed system over the existing voltage source inverter. One is the low system cost due to using the conventional thyristors. Another is easy expansion of system operation voltage because th series operation of thyristor devices is already proven in HVDC system.

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Operation Analysis of Resonant DC/DC Converter able to Harvest Thermoelectric Energy (열전에너지 수확이 가능한 공진형 DC/DC 컨버터의 동작 해석)

  • Kim, Hyeok-Jin;Chung, Gyo-Bum;Cho, Kwan-Youl;Choi, Jae-Ho
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.2
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    • pp.150-158
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    • 2010
  • The operational characteristics of a resonant DC/DC converter, which can harvest thermoelectric energy, is analyzed, depending on the relative magnitudes of the input voltage and the load voltage. The resonant converter consists of LC resonant circuit connected to DC input source and a resonant pulse converter in which the input energy is transferred to the load as the resonant capacitor voltage is peak. The resonant capacitor doubles the input voltage by the resonance phenomenon. By the relative magnitude between the input voltage and the output voltage, the resonant DC/DC converter operates in three different modes. For boost mode, the peak voltage of the resonant capacitor is smaller than the load voltage. For hybrid mode, the peak voltage of the resonant capacitor is bigger than the load voltage and every switching period has both the boost mode and the direct mode. For the direct mode, the input voltage is bigger than the load voltage and the converter transfers directly the input energy to the load without the switching operation. Operation principles and the feasibility of the converter for the thermoelectric energy harvesting are verified with PSPICE simulation and experiment.

Force Commutated Circuit for Driving The Load Commutated Current Source Inverter (부하전류식(負荷轉流式) 전류형(電流型) 인버터를 구동(驅動)하기 위한 강제전류회로(强制轉流回路))

  • Chung, Y.T.;Lee, S.Y.;Soh, Y.C.;Lee, J.W.
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.731-735
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    • 1993
  • When induction motor is driven with a load commutated inverter, the output part of the inverter must be capacitive. But, in order to be a good load commutation at the low speed range, very large capacitor or force commutated circuit must be used regarding the capacity of motor. This paper proposed the force commutated circuit for driving the motor in case of the installation of capacitor which can be capable of load commutation at the rating speed. The force commutated circuit is operated by the LC resonant circuit, auxiliary source and SCR, and also composed of the commutation circuit which control the interval of the inverse voltage across the inverter.

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