• 제목/요약/키워드: Rectifier Circuit

검색결과 444건 처리시간 0.026초

Analysis, Design and Implementation of a New Chokeless Interleaved ZVS Forward-Flyback Converter

  • Taheri, Meghdad;Milimonfared, Jafar;Namadmalan, Alireza;Bayat, Hasan;Bakhshizadeh, Mohammad Kazem
    • Journal of Power Electronics
    • /
    • 제11권4호
    • /
    • pp.499-506
    • /
    • 2011
  • This paper presents an interleaved active-clamping zero-voltage-switching (ZVS) forward-flyback converter without an output choke. The presented topology has two active-clamping circuits with two separated transformers. Because of the interleaved operation of the converter, the output current ripple will be reduced. The proposed converter can approximately share the total load current between the two secondaries. Therefore, the transformer copper loss and the rectifier diodes conduction loss can be decreased. The output capacitor is made of two series capacitors which reduces the peak reverse voltage of the rectifier diodes. The circuit has no output inductor and few semiconductor elements, such that the adopted circuit has a simpler structure, a lower cost and is suitable for high power density applications. A detailed analysis and the design of this new converter are described. A prototype converter has been implemented and experimental results have been recorded with an ac input voltage of 85-135Vrms, an output voltage of 12V and an output current of 16A.

토크리플 억제와 역률개선을 위한 단상 SRM의 구동시스템 (Single-phase SRM Drive for Torque Ripple Reduction and Power Factor Improvement)

  • 안진우;양가녕
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
    • /
    • 제55권8호
    • /
    • pp.389-395
    • /
    • 2006
  • In the single-phase switched reluctance motor (SRM) drive, the required DC source is generally supplied by the circuit consisting of bridge rectifier with diodes and many filter capacitances connected with AC source. Although the peak torque ripple of SRM is small because of large capacity of the capacitance, the charge and discharge time swhich the AC source acts on the capacitance are small and the peak current will pass on the side of source, so power factor and system efficiency decrease. Therefore a novel SRM drive system is presented in this paper, which includes drive circuit realizing reduction of torque ripple and improvement of power factor and switching topology. The proposed drive circuit consists of one switching part and diodes which can separate the output of AC/DC rectifier from the large capacitance and supply power to SRM alternately in order to realize reduction of torque ripple and improvement of power factor through the turn on and turn off of switching part. In addition, the validity of method is tested by simulation and experiment.

신호용 PEAK 전압 정밀검출에 관한 연구 (A Study on Accuracy Detection Method for Signal Peak Voltage)

  • 박호철;성형수;한승문;한정훈
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2000년도 하계학술대회 논문집 D
    • /
    • pp.2528-2530
    • /
    • 2000
  • In general, Diode makes a major role in electronic circuit. For example, switching of rectifier, cross current of switching rectifier, energy transfer of electronic element and reverse charge of capacitor, voltage insulation, energy feedback from load to power supply, and such as recovery of storaged energy. Generally, We regard power diode as ideal element, but it has a certain boundary actually, specially, We use diode for detecting circuit peak hold voltage signal. It has cut in voltage. It occurs error of measurement value namely. This error, below in region diode voltage drop (0.7v) measurement value is wholesome signal, Specially, We can not get precision data. Therefore, precision level is low between theoretical and measurement data because of error in actual circuit. Conclusionally, In this paper, We define the error concerning to the power diode characteristics which is used detecting of the minute signal, and recommend the method that minimize measurement error.

  • PDF

압전소자를 이용한 에너지 하베스터용 전력변환장치 연구 (A Study of Power Conversion System for Energy Harvester Using a Piezoelectric Materials)

  • 안현성;김영철;차한주
    • 전기학회논문지
    • /
    • 제66권7호
    • /
    • pp.1059-1065
    • /
    • 2017
  • In this paper, the energy harvester with a piezoelectric materials is modeled as the electric equivalent circuit, and performances of a standard DC method and a Parallel-SSHI method are verified through experiment under variable force and load conditions. Piezoelectric generator consists of mass, damper and spring constant, and it is modeled by electrical equivalent circuit with RLC components. Standard DC and Parallel-SSHI are used as power conversion methods, and standard DC consists of full-bridge rectifier and smoothing capacitor. Parallel-SSHI method is composed of L-C resonant circuit, zero-crossing detector and full-bridge rectifier. In case of simulation under $100k{\Omega}$ load condition, the harvested power is $500{\mu}W$ in Standard DC and $670{\mu}W$ in Parallel-SSHI, respectively. In experiment, the harvested power under $100k{\Omega}$ load condition is $420{\mu}W$ in standard DC and $602{\mu}W$ in Parallel-SSHI. Harvested power of Parallel-SSHI is improved by approximately 40% more than that of standard DC method.

Passive Lossless Snubbers Using the Coupled Inductor Method for the Soft Switching Capability of Boost PFC Rectifiers

  • Kim, Ho-Sung;Baek, Ju-Won;Ryu, Myung-Hyo;Kim, Jong-Hyun;Jung, Jee-Hoon
    • Journal of Power Electronics
    • /
    • 제15권2호
    • /
    • pp.366-377
    • /
    • 2015
  • In order to minimize switching losses for high power applications, a boost PFC rectifier with a novel passive lossless snubber circuit is proposed. The proposed lossless snubber is composed of coupled inductors merged into a boost inductor. This method compared with conventional methods does not need additional inductor cores and it reduces extra costs to implement a soft switching circuit. Especially, the proposed circuit can reduce the reverse recovery current of output diode rectifiers due to the coupling effect of the inductor. During turn-on and turn-off operating modes, the proposed PFC converter operates under soft switching conditions with high power conversion efficiency. In addition, the performance improvement and analysis of the operating effects of the coupled inductors were also presented and verified with a 3.3 kW prototype rectifier.

RFID 태그 칩 구동을 위한 새로운 고효율 CMOS 달링턴쌍형 브리지 정류기 (A New High-Efficiency CMOS Darlington-Pair Type Bridge Rectifier for Driving RFID Tag Chips)

  • 박광민
    • 한국산학기술학회논문지
    • /
    • 제13권4호
    • /
    • pp.1789-1796
    • /
    • 2012
  • 본 논문에서는 RFID 태그 칩 구동을 위한 새로운 고효율 CMOS 브리지 정류기를 설계하고 해석하였다. 동작 주파수가 높아짐에 따라 증가하는 게이트 누설전류의 주 통로가 되는 게이트 커패시턴스를 회로적인 방법으로 감소시키기 위해 제안한 정류기의 입력단을 두 개의 NMOS로 종속접속형으로 연결하여 설계하였으며, 이러한 종속접속형 입력단을 이용한 게이트 커패시턴스 감소 기법을 이론적으로 제시하였다. 또한 제안한 정류기의 출력특성은 고주파 소신호 등가회로를 이용하여 해석적으로 유도하였다. 일반적인 경우의 $50K{\Omega}$ 부하저항에 대해, 제안한 정류기는 915MHz의 UHF(for ISO 18000-6)에서는 28.9%, 2.45GHz의 마이크로파 대역 (for ISO 18000-4)에서는 15.3%의 전력변환효율을 보여, 915MHz에서 26.3%와 26.8%, 2.45GHz에서 13.2%와 12.6%의 전력변환효율을 보인 비교된 기존의 두 정류기에 비해 보다 개선된 전력변환효율을 보였다. 따라서 제안한 정류기는 다양한 종류의 RFID 시스템의 태그 칩 구동을 위한 범용 정류기로 사용될 수 있을 것이다.

단위역률 정류기의 병렬운전 (Parallel operation of rectifier with unit-power factor)

  • 이성희;김태원;박재욱
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2011년도 제42회 하계학술대회
    • /
    • pp.1212-1213
    • /
    • 2011
  • PWM(pulse width modulation) rectifier has unit power factor and low harmonic distortion with high power conversion efficiency in entire loading range. These merits of PWM rectifier help the spread of DC distribution system. In addition, if multiple PWM rectifiers can be operated in parallel connection, maintenance process can be simple and reliability of power source can be advanced because of the hot swapping is available. The other way, the load unbalance among rectifiers can force a converter to stop by over current. The surge current by closed circuit composition between rectifiers can force switching devices damage. In this paper, some problems that can occur in case of parallel operation of PWM rectifiers and problem eliminating methods are considered.

  • PDF

Implementation of Digital Control for Critical Conduction Mode Power Factor Correction Rectifier

  • Shin, Jong-Won;Baek, Jong-Bok;Cho, Bo-Hyung
    • 전력전자학회:학술대회논문집
    • /
    • 전력전자학회 2011년도 전력전자학술대회
    • /
    • pp.147-148
    • /
    • 2011
  • In this paper, implementation of digital control for critical conduction mode power factor correction (PFC) rectifier is presented. Critical conduction mode is widely used in medium and low power conversion application due to its minimized MOSFET turn-on loss and diode reverse-recovery problem. However, it needs additional zero current detection circuit and maximum frequency limit to properly turn the MOSFET on and avoid the excessive switching loss in light load operation. This paper explains the digital IC implementation and verifies its operation with 200-W prototype PFC rectifier.

  • PDF

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

  • 김칠용;문상필;조만철;서기영;권순걸
    • 한국조명전기설비학회:학술대회논문집
    • /
    • 한국조명전기설비학회 2007년도 춘계학술대회 논문집
    • /
    • 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

하이브리드 Cascade 멀티레벨 PWM 정류기의 정상상태 특성 해석 (Analysis of Steady State Characteristics of Hybrid Cascade Multilevel PWM Rectifier)

  • 최남섭
    • 한국정보통신학회:학술대회논문집
    • /
    • 한국해양정보통신학회 2000년도 추계종합학술대회
    • /
    • pp.573-576
    • /
    • 2000
  • In this paper, analysis of operating characteristics of hybrid cascade multilevel PWM rectifier without bulky and heavy isolation transformers is presented. The multilevel PWM rectifier is analyzed by using the circuit DQ transformation whereby the static and dynamic characteristics and some useful design relationships are obtained. Then, the operating characteristics such as active/reactive power relationships with respect to control variables, DC voltages build up are presented. It will be shown that the DC voltages for the multilevel output generation may be directly built up from AC utility source. Finally, to confirm the validity of the analysis, MATLAB simulations are tarried out.

  • PDF