• Title/Summary/Keyword: DC Output Filter

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A study on the PWM power converter with high frequency and high voltage using MOS-GTO (MOS-GTO를 이용한 고주파, 고전압 전력변환기 설계에 관한 연구)

  • Roh, Jin-Eep;Seong, Se-Jin
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.1009-1011
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    • 1992
  • This paper discribes a study on the bridge type power converter for laser high power generator with high frequency and high voltage using MOS-GTO. This converter effectively makes the best of the high frequency HV transformer and input-side equivalent parasitic capacitance of high voltage feeding cable in place of DC output smoothing filter. The cicuit configuration and performance are discussed and design criteria are given. The prototype rated of 10 KW, 100 KHz is implemented and experimental results are given.

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Fuzzy Controller Modeling for Electromagnetic Levitation Systems based on Clustering Algorithm (클러스터링에 기초한 자기부상시스템의 퍼지제어기 모델링)

  • Kim, Min-Soo;Byun, Yeun-Sub;Lee, Kwan-Sup
    • Proceedings of the KSR Conference
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    • 2006.11a
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    • pp.145-159
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    • 2006
  • This paper describes the development of a clustering based fuzzy controller of an electromagnetic suspension vehicle using gain scheduling method and Kalman filter for a simplified single magnet system. Electromagnetic suspension vehicle systems are highly nonlinear and essentially unstable systems For achieving the levitation control of the DC electromagnetic suspension system, we considered a fuzzy system modeling method based on clustering algorithm which a set of input/output data is collected from the well defined Linear Quadratic Gaussian(LQG) controller. Simulation results show that the proposed clustering based fuzzy controller methodology robustly yields uniform performance with adequate gap response over the mass variation range.

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A Sinusoidal Input Current Multi-Level Converter Using Transformer (변압기를 사용한 정현파 입력전류 Multi-Level Converter)

  • Kim, C.S.;Lee, H.W.;Suh, K.Y.;Chun, J.H.;Han, H.D.;Park, W.H.
    • Proceedings of the KIEE Conference
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    • 2001.04a
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    • pp.250-253
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    • 2001
  • This paper is proposed a sinusoidal input voltage Multi-level AC-DC Converter using transformer. In this paper Multi-level PWM Control converter which controls input current by combining buck Converters together to improve input current characteristic, and confirmed its validity throughout simulation and experiment. This method, which is multiplying and duplicating output of converter of equal capacity, is able to control unit power factor of input current, reduce the problem caused by high frequency switching, and apply to high power converter because filter is not necessary.

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A Study of Phase Noise Due to Power Supply Noise in a CMOS Ring Oscillator

  • Park Se-Hoon
    • Journal of information and communication convergence engineering
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    • v.3 no.4
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    • pp.184-186
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    • 2005
  • The effect of power supply noise on the phase noise of a ring oscillator is studied. The power supply noise source in series with DC power supply voltage is applied to a 3 stage CMOS ring oscillator. The phase noise due to the power supply noise is modeled by the narrow band phase modulation. The model is verified by the fact that the spectrum of output of ring oscillator has two side bands at the frequencies offset from the frequency of the ring oscillator by the frequency of the power supply noise source. Simulations at several different frequency of the power supply noise reveals that the ring oscillator acts as a low pass filter to the power supply noise. This study, as a result, shows that the phase noise generated by the power supply noise is inversely proportional to the frequency offset from the carrier frequency.

The Current Control with Multi-level Converter on Transformer type (변압기 방식 멀티레벨 컨버터의 전류제어)

  • Kim C. S.;Kwak D. G.;Chun J. H.;Suh K. Y.;Lee H. W.
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.215-218
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    • 2001
  • This paper is proposed a sinusoidal input current multi-level ac-dc converter using transformer. The multi-level converter which controls input current by combining Buck converter to Improve input current characteristics. This method, which is multiplying and duplicating output of converter of equal capacity, is able to control unit power factor of input current, reduce the problem caused by high frequency switching, and apply to high power converter because filter is not necessary The feasibility of the circuit is verified by computer simulation using PSIM

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A Novel 11-Level PWM Inverter for Improving Output Voltage Waveform (출력 전압 파형 개선을 위한 새로운 11 레벨 PWM 인버터)

  • 강필순;박성준;김철우
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.2
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    • pp.99-106
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    • 2003
  • This paper presents a novel multilevel PWM inverter employing series-connected transformers in order to improve the waveshape of output voltage and to reduce its harmonics. The proposed 11-level inverter consists of three full-bridge inverter modules and their corresponding transformers. Among their inverter modules, one is used as PWM operation and the others as level generation. From a suitable selection of turns ratio of transformer, continuous output voltage levels were generated appearing an integral ratio to input DC source. Because of their series connection of transformers, output filter inductor is not necessary. The operational principles and analysis are explained, and it is compared with a conventional multilevel PWM inverter. The validity of the proposed system Is verified through the experimental results using a prototype.

Study Of Millimeter-Wave Passive Imaging Sensor Using the Horn Array Antenna (반사판을 이용한 밀리미터파 수동 이미징 시스템 연구)

  • Lim, Hyun-Jun;Chae, Yeon-Sik;Jung, Kyung-Kwon;Kim, Mi-Ra;Rhee, Jin-Koo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.2
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    • pp.67-73
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    • 2010
  • We have developed a millimeter-wave passive imaging system with reflector for detection of concealed objects. We have designed a millimeter-wave sensor, control device for reflector control, and a lens for focusing of millimeter-wave signal at center frequency of 94GHz. DC signal from millimeter-wave sensor output is filtered by low pass filter and amplified by video amplifier, and then converted into digital signal by using ADC/DAQ. This signal is image processed by computer, and it is possible to obtain millimeter-wave passive image with resolution of $18{\times}64$ pixel using the fabricated system. It is shown that we can obtain the image of men and concealed object with the system.

A CMOS Analog Front End for a WPAN Zero-IF Receiver

  • Moon, Yeon-Kug;Seo, Hae-Moon;Park, Yong-Kuk;Won, Kwang-Ho;Lim, Seung-Ok;Kang, Jeong-Hoon;Park, Young-Choong;Yoon, Myung-Hyun;Yoo, June-Jae;Kim, Seong-Dong
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.769-772
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    • 2005
  • This paper describes a low-voltage and low-power channel selection analog front end with continuous-time low pass filters and highly linear programmable-gain amplifier(PGA). The filters were realized as balanced Gm-C biquadratic filters to achieve a low current consumption. High linearity and a constant wide bandwidth are achieved by using a new transconductance(Gm) cell. The PGA has a voltage gain varying from 0 to 65dB, while maintaining a constant bandwidth. A filter tuning circuit that requires an accurate time base but no external components is presented. With a 1-Vrms differential input and output, the filter achieves -85dB THD and a 78dB signal-to-noise ratio. Both the filter and PGA were implemented in a 0.18um 1P6M n-well CMOS process. They consume 3.2mW from a 1.8V power supply and occupy an area of $0.19mm^2$.

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Firing Angle Control of Thyristor Converter using PID Controller with Parallel Data Loop (데이터 병렬루프를 가지는 사이리스터 컨버터의 PID 점호각 제어)

  • Lee, Jae-Sung;Jang, Jin-Seok;Choo, Young-Bae;Lee, Dong-Hee
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.4
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    • pp.278-284
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    • 2009
  • This paper presents a firing angle controller of a thyristor converter for DC power supply using PID controller with parallel data loop to improve the dynamic response. The proposed parallel data loop for firing angle controller of 3-phase semi-converter, generates pre-measured firing angle according to reference voltage and load current. With the approximated firing angle according to operating conditions, the output voltage can fast keep the reference value with small voltage error. And the PID controller compensates the output voltage error from the firing angle of parallel data loop. In order to reduce the sudden changing of the data from current ripple, a simple digital low pass filter is used to determine the output data. The proposed control scheme is verified by the experimental test of a practical 50[A] grade thyristor converter system.

A Design Of Cross-Shpaed CMOS Hall Plate And Offset, 1/f Noise Cancelation Technique Based Hall Sensor Signal Process System (십자형 CMOS 홀 플레이트 및 오프셋, 1/f 잡음 제거 기술 기반 자기센서 신호처리시스템 설계)

  • Hur, Yong-Ki;Jung, Won-Jae;Lee, Ji-Hun;Nam, Kyu-Hyun;Yoo, Dong-Gyun;Yoon, Sang-Gu;Min, Chang-Gi;Park, Jun-Seok
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.5
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    • pp.152-159
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    • 2016
  • This paper describes an offset and 1/f noise cancellation technique based hall sensor signal processor. The hall sensor outputs a hall voltage from the input magnetic field, which direction is orthogonal to hall plate. The two major elements to complete the hall sensor operation are: the one is a hall sensor to generate hall voltage from input magentic field, and the other one is a hall signal process system to cancel the offset and 1/f noise of hall signal. The proposed hall sensor splits the hall signal and unwanted signals(i.e. offset and 1/f noise) using a spinning current biasing technique and chopper stabilizer. The hall signal converted to 100 kHz and unwanted signals stay around DC frequency pass through chopper stabilizer. The unwanted signals are bloked by highpass filter which, 60 kHz cut off freqyency. Therefore only pure hall signal is enter the ADC(analog to dogital converter) for digitalize. The hall signal and unwanted signal at the output of an amplifer and highpass filter, which increase the power level of hall signal and cancel the unwanted signals are -53.9 dBm @ 100 kHz and -101.3 dBm @ 10 kHz. The ADC output of hall sensor signal process system has -5.0 dBm hall signal at 100 kHz frequency and -55.0 dBm unwanted signals at 10 kHz frequency.