• Title/Summary/Keyword: LC Resonant Circuit

Search Result 77, Processing Time 0.023 seconds

Implementation of a High-Power-Factor Single-Stage Electronic Ballast for fluorescent lamps (단일전럭단을 갖는 고역율 형광등용 전자식 안정기 구현)

  • 서철식;박재욱;김해준;김동희
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.17 no.1
    • /
    • pp.1-9
    • /
    • 2003
  • In this paper, prototype of high-power-factor single-stage electronic ballast for fluorescent lamp is designed and implemented. A new low cost single stage high power factor electronic ballast for fluorescent lamps is based on integration of two-boost converter and LC type high frequency resonant inverter. The proposed ballast is combined by simple construction, because full bridge rectifier diode is eliminated and simple control circuit is applied. Boost converter operate in the voltage of positive and negative half cycle respectively at line frequency (60㎐), operation in discontinuous conduction mode performs high power factor. The experimental results show the good performance as PF 0.99, THD 15.4%, and CF 1.65 at output 63.5〔W〕.

Operating Characteristics Analysis Of Bi-Directional DC/DC Converter using PFM control with high efficiency at whole load range (전 부하 영역에서 고효율을 가지는 PFM 제어를 이용한 양방향 DC/DC 컨버터의 동작특성 분석)

  • Kim, Ji-Hwan;Hwang, Sun-Hee;Ryu, Dong-Gyun;Jung, Doo-Yong;Jung, Yong-Chae;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
    • /
    • 2012.07a
    • /
    • pp.29-30
    • /
    • 2012
  • In this paper, a performance of bi-directional DC/DC converter using PFM control at whole load range is analyzed. A bi-directional DC/DC converter using PFM control in this paper can be soft switching operation with LC series resonant circuit. It's difficult to expect a high efficiency at whole load range in general resonant converter because of limitation of soft switching area. Therefore converter used in this paper has a variable frequency PFM control to overcome a limitation of soft switching area and it makes a high efficiency at whole load range by implementing a soft switching at light load area of restricted soft switching. The high efficiency at whole load range is verified by simulation and experimental result.

  • PDF

Ignition Characteristics Analysis According to the Cable length Between the Ignition and Lamp (HID 램프용 점화기와 램프간 거리에 따른 점등 특성 분석)

  • Park, Chong-Yeun;Kim, Ki-Nam
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.23 no.6
    • /
    • pp.24-30
    • /
    • 2009
  • We compared 3 kinds of ignitor characteristics and represented the procedure in order to turn the HID lamp on. Also, we analysed the cable characteristic based on the length between ignitor and the HID lamp and proved it theoretically. In practice, the ignition voltage contains a lot of problems because it is easily changed by the structure of ignitors, cable length and characteristics. In this paper, therefore, 3 ignitors, which are LC resonant typed, arc-gap circuit typed and drive frequency variable typed, have simulated and analysed with the 25[m] cable length. After careful consideration of comparisons made of all the ignitors' and cables' characteristics, a number of possible solutions were finalized.

A Study on DC-DC Converter for X-Ray Using Soft-Switching Method (소프트 스위칭 방식을 이용한 X-Ray용 DC-DC Converter에 관한 연구)

  • Kim, Hack-Seong;Kim, Hyen-Joon;Won, Chung-Yuen;Yoo, Dong-Wook;Ha, Sung-Woon
    • Proceedings of the KIEE Conference
    • /
    • 1994.07a
    • /
    • pp.379-381
    • /
    • 1994
  • This paper is concerned with a zero-voltage soft-switching PWM DC-DC high-pelter converter using IGBTs, which Bakes the most of the parastic LC parameters of high-voltage transformer link, for diagnostic X-Ray power generator. The converter circuit basically utilizes phase-shift pulse width modulated series resonant full-bridge PWM DC-DC high-Power converter operating at a constant frequency:20kHz. This technique brings about dramatic decreases in the switching losses of power devices and their electrical stresses as compared with the commonly-used hard-switching PWM DC-DC power converter. The high-frequency switching operation of the converters has some effective advantages, which consist in the physical reduction in size and weight and lowered acoustic noise.

  • PDF

Implementation of a High-Power-Factor Single-Stage Electronic Bal last for fluorescent lamps (전단일전력단을 갖는 고역율 형광등용 전자식 안정기 구현)

  • 서철식;박재욱;김해준;노채균;김동희
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 2001.11a
    • /
    • pp.123-127
    • /
    • 2001
  • In this paper, prototype high-power-factor single-stage electronic ballast for fluorescent lamps is designed and implemented. A new low cost single stage high power factor electronic ballast for fluorescent lamps is based on integration of two-boost converter and LC type high frequency resonant converter. A ballast is obtained by simple construction, because full bridge rectifier diode is eliminated and simple control circuit is applied. Using two boost converter operating positive and negative half cycle respectively at line frequency (60Hz), operation in discontinuous conduction mode performs high power factor. The experimental results Show the good performance as PF 0.99, $A_{THD}$ 15.4%, and CF 1.65 at Output 63.5W.W.

  • PDF

Development of the 120kW Class MPC Power Supply for DeNOx and DeSox System (120kW급 탈황탈질용 MPC전원장치 개발)

  • Kim, Soo-Hong;Kwon, Byung-Ki
    • Proceedings of the KIPE Conference
    • /
    • 2009.11a
    • /
    • pp.237-239
    • /
    • 2009
  • This paper presents a new developed 160kV-120kW Class MPC (magnetic pulse compressor) power supply for DeNOx, DeSOx system. The circuit consists of N-series connected CCPS (capacitor charging power supply) and MPC Tank. The MPC power supply developed compared to the conventional LC resonant type has many advantage, it was verified reliability of a product by module, simulator and tank connection test. Now, the developed MPC power supply is installed POSCO sintering plant for DeSOx, DeNOx system.

  • PDF

A New Harmonics Reducing Type High Factor Single-Phase Rectifier Circuit (새로운 고조파 저감형 고역율 단상정류 회로)

  • Kim, Chil-Yong;Mun, Sang-Pil;Cho, Man-Chul;Shu, Ki-Young;Kwon, Soon-Kurl
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 2007.05a
    • /
    • pp.468-472
    • /
    • 2007
  • For small capacity rectifier circuits such as these for consumer electronics and appliances, capacitor input type rectifier circuits are generally used. Consequently, various harmonics generated within the power system become a serious problem. Various studies of this effect have been presented previously. The absence of switching devices makes systems more tolerant to over-load, and brings low radio noise benefits. We propose a power factor correction scheme using a LC resonant in commercial frequency without switching devices. In this method, It makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence, the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh orders are much reduced. The result are confirmed by the theoretical and expermental implementations

  • PDF

A Non-contact Two-Dimensional Position Sensing Device Using Electromagnetic Induction (전자기 유도 방식을 이용한 비접촉식 2차원 위치 센서)

  • Ryu, Young-Kee;Koh, Kuk-Won;Kim, Hak-Soo
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.29 no.11
    • /
    • pp.1159-1163
    • /
    • 2012
  • In this paper, we would like to introduce two dimensional non-contact position sensor by using an electromagnetic induction based coil system and an algorithm to estimate the position of pointer. The sensor which will introduce in this paper is composed of a pointer including LC resonant circuit and a sensor board to detect the electromagnetic signal from the pointer. Because of the simplicity shape of the line antenna, low cost and free form curved shape of the sensor device is possible. In this research, we proposed a new two dimensional non-contact type electromagnetic sensor system and realized the proposed sensor device. From the experiments, the proposed device can be employed for the two dimensional position sensor.

DC-Link Active Power Filter for High-Power Single-Phase PWM Converters

  • Li, Hongbo;Zhang, Kai;Zhao, Hui
    • Journal of Power Electronics
    • /
    • v.12 no.3
    • /
    • pp.458-467
    • /
    • 2012
  • Single phase converters suffer from ripple power pulsating at twice the line frequency. The ripple power is usually absorbed by a bulky capacitor bank and/or a dedicative LC resonant link, resulting in a low power density and a high cost. An alternative solution is using a dc link active power filter (APF) to direct the pulsating power into another energy-storage component. The main dc link filter capacitor can then be reduced substantially. Based on a mainstream dc APF topology, this paper proposed a new control strategy incorporating both dual-loop control and repetitive control. The circuit parameter design is also re-examined from a control point of view. The proposed APF scheme has better control performance, and is more suited for high power applications since it works in CCM and with a low switching frequency.

Topology of Single-Phase PFC Rectifier Circuit with Sinusoidal of Input Current (입력전류의 정현화에 의한 단상PFC정류회로의 토폴로지)

  • Lee, S.H.;Kim, Y.M.;Kwon, S.K.;Suh, K.Y.
    • Proceedings of the KIEE Conference
    • /
    • 2002.11c
    • /
    • pp.290-293
    • /
    • 2002
  • For small capacity rectifier circuits such as these for consumer electronics and appliances, capacitor input type rectifier circuits are generally used. Consequently, various harmonics generated within the power system become a serious problem. Various studies of this effect have been presented previously. However, most of these employ switching devices, such as FETs and the like. The absence of switching devices makes systems more tolerant to over-load, and brings low radio noise benefits. We propose a power factor connection scheme using a LC resonant in commercial frequency without switching devices. In this method, It makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence, the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh orders are much reduced. The result are confirmed by the theoretical and experimental implementations.

  • PDF