• Title/Summary/Keyword: Low Voltage Capacitor

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Transformer Parasitic Inductor and Lossless Capacitor-Assisted Soft-Switching DC-DC Converter with Synchronous Phase-Shifted PWM Rectifier with Capacitor Input Filter

  • Saitoh, Kouhei;Abdullah Al, Mamun;Gamage, Laknath;Nakaoka, Mutsuo;Lee, Hyun-Woo
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.217-221
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    • 2001
  • This paper presents a new prototype of soft-switching DC-DC power converter with a high frequency transformer link which has two active power controlled switches in full bridge rectifier with capacitor input type smoothing filter. In this DC-DC converter, ZVS of the inverter in transformer primary side and ZCS of active rectifier area in secondary side can be completely achieved by taking advantage of parasitic inductor component of high-frequency transformer and loss less snubbing capacitors. Its operation principle and salient features are described. The steady-state operating characteristics of the proposed DC-DC power converter are illustrated and discussed on the basis of the simulation results in addition to the experimental ones obtained by 2kw-40kHz power converter breadboard set up.

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A Study on the Sterling Characteristics for Capacitor-run Single Phase Permanent Magent Synchronous Motor (커패시터 운전 단상 영구자석형 동기전동기 기동특성에 관한 연구)

  • 홍선기
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.2
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    • pp.150-156
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    • 2004
  • Although permanent magnet single phase synchronous motor which starts and runs through single phase voltage source has high efficiency, it is difficult to determine the rotating direction. In this paper, the starting characteristics of the capacitor-run single phase synchronous motor has been studied. The stator has same structure with the capacitor-run single phase induction motor, however the rotor consists of permanent magnet. In this case, the starting conditions according to the rotor and stator conditions are determined and the direction of the motor can be determined. From these results, it is desired that the proposed motor can be applied to the loads like the fans which has low starting torque.

The Study of Ripple Reduction of the PFC CCM Flyback Converter without Electrolytic Capacitor for LED Lightings using LC Resonant Filter (LC 공진 필터를 이용한 전해 커패시터 없는 LED 구동용 PFC CCM 플라이백 컨버터의 출력 전류 리플 저감에 관한 연구)

  • KIm, Choon-Tack;Kim, Young-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.4
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    • pp.601-610
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    • 2016
  • The light-emitting diode (LED) has been used in a variety of industrial fields and for general 0lighting purposes on account of its high efficiency, low power consumption and long lifespan. The LED is driven by direct current; therefore, an AC/DC converter is typically required for its use. An electrolytic capacitor is generally used for stabilizing DC voltage during use of the AC/DC converter. However, this capacitor has a short lifespan, which makes it a limiting factor in LED lighting. Furthermore, LED lighting requires a dimmable control to enable energy savings and fulfil a growing consumer demand. In this paper, the dimmable single-stage power factor correction (PFC) continuous conduction mode (CCM) flyback converter that employs no electrolytic capacitor is presented. The LC resonant filter is alternatively applied to reduce the 120[Hz] ripple on the output. And the optimum value of the LC resonant filter parameters considering both efficient and performance is analysed. Simulation and experimental results verify the satisfactory operation of the converter.

Characteristics Analysis of Reactor and Capacitor for Passive Filter (수동형 필터의 리액터 및 커패시터 특성 해석)

  • Kim, Il-Jung;Kim, Jong-Gyeum
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.2
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    • pp.82-88
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    • 2009
  • Power capacitor is generally installed to compensate for the low power factor of inductive load But it has been used as passive filter to reduce harmonics generated by the power conversion device. Passive filter is composed by the series connection of reactor and capacitor. Because passive filter has play an important role on the absorber of harmonics, it takes voltage and current stress, follows partially burned on flamed and degradation, finally it has not guaranteed normal life. In this paper, we analyzed the effect that passive filter installed at the source side of PWM inverter is received by harmonics absorption.

An Integrated Single Stage AC/DC Converter (고전력밀도 단일전력단 교류/직류 컨버터)

  • Phum, Sopheak;Kang, Cheolha;Kim, Eun-Soo;Lee, Young-Soo
    • Proceedings of the KIPE Conference
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    • 2012.11a
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    • pp.88-90
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    • 2012
  • A study on an integrated single stage AC/DC converter is presented in this paper. The input current can be controlled by the auxiliary winding($L_{aux}$), auxiliary primary winding($N_3$), and the boost inductor($L_B$) which are designed to operate in discontinuous conduction mode(DCM) to reduced the total harmonic distortion(THD) of input current. The auxiliary primary winding($N_3$) is critically selected in order to compress the input capacitor voltage($V_{in}$) as well as to reduce the current stress of the switch(Q). Low total harmonic distortion(THD), low input voltage($V_{in}$) in universal input voltage($V_{AC}$), low current stress at the switching device and high efficiency are the main consideration keys in this design to achieve high performance system with low cost of single stage AC/DC converter. A 30W single stage AC/DC prototype converter is under study.

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A New Three Winding Coupled Inductor-Assisted High Frequency Boost Chopper Type DC-DC Power Converter with a High Voltage Conversion Ratio

  • Ahmed Tarek;Nagai Shinichiro;Hiraki Eiji;Nakaoka Mutsuo
    • Journal of Power Electronics
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    • v.5 no.2
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    • pp.99-103
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    • 2005
  • In this paper, a novel circuit topology of a three-winding coupling inductor-assisting a high-frequency PWM boost chopper type DC-DC power converter with a high boost voltage conversion ratio and low switch voltage stress is proposed for the new energy interfaced DC power conditioner in solar photovoltaic and fuel cell generation systems. The operating principle in a steady state is described by using its equivalent circuits under the practical condition of energy processing of a lossless capacitive snubber. The newly-proposed power MOSFET boost chopper type DC-DC power converter with the three-winding coupled inductor type transformer and a single lossless capacitor snubber is built and tested for an output power of 500W. Utilizing the lower voltage and internal resistance power MOSFET switch in the proposed PWM boost chopper type DC-DC power converter can reduce the conduction losses of the active power switch compared to the conventional model. Therefore, the total actual power conversion efficiency under a condition of the nominal rated output power is estimated to be 81.1 %, which is 3.7% higher than the conventional PWM boost chopper DC power conversion circuit topology.

New Isolated Single-Phase AC-DC Converter for Universal Input Voltage

  • Lee, Ming-Rong;Yang, Lung-Sheng;Lin, Chia-Ching
    • Journal of Power Electronics
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    • v.13 no.4
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    • pp.592-599
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    • 2013
  • This paper investigates a new isolated single-phase AC-DC converter, which integrates a modified AC-DC buck-boost converter with a DC-DC forward converter. The front semi-stage is operated in discontinuous conduction mode (DCM) to achieve an almost unity power factor and a low total harmonic distortion of the input current. The rear semi-stage is used for step-down voltage conversion and electrical isolation. The front semi-stage uses a coupled inductor with the same winding-turn in the primary and secondary sides, which is charged in series during the switch-on period and is discharged in parallel during the switch-off period. The discharging time can be shortened. In other words, the duty ratio can be extended. This semi-stage can be operated in a larger duty-ratio range than the conventional AC-DC buck-boost converter for DCM operation. Therefore, the proposed converter is suitable for universal input voltage (90~264 $V_{rms}$) and a wide output-power range. Moreover, the voltage stress on the DC-link capacitor is low. Finally, a prototype circuit is implemented to verify the performance of the proposed converter.

Programmable RF Built-ln Self-Test Circuit for Low Noise Amplifiers (저잡음 증폭기를 위한 프로그램 가능한 고주파 Built-In Self-Test회로)

  • Ryu, Jee-Youl;Noh, Seok-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.1004-1007
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    • 2005
  • This paper presents a programmable RF BIST (Built-in Self-Test) circuit for low noise amplifiers. We have developed a new on-chip RF BIST circuit that measures RF parameters of low noise amplifier (LNA) using only DC measurements. The BIST circuit contains test amplifier with programmable capacitor banks and RF peak detectors. The test circuit utilizes output DC voltage measurements and these measured values are translated into the LNA specifications such as input impedance and gain using the mathematical equations. Our on-chip BIST can be self programmed for 1.8GHz, 2.4GHz and 5.25GHz LNA for GSM, Bluetooth and IEEE802.11g standards.

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A Study on the Three-Level Converter using Primary Auxiliary Circuit (1차측 보조회로를 이용한 Three-Level 컨버터에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Cho, Kyu-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.6
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    • pp.972-981
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    • 2008
  • A New ZVS(Zero Voltage Switching) and ZVZCS(Zero Voltage and Zero Current Switching) Three-Level Converter is proposed. The proposed converter presented in this paper used a phase shift control with a flying capacitor in the primary side to achieve ZVS for the all switch. A primary auxiliary circuit, which consists of one coupled inductor, is added in the primary to provide ZVZCS conditions to primary switches. Many advantages including simple circuit topology high efficiency, and low cost make this converter attractive for high power applications. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 2kW(27V, 74A) 40 kHz IGBT based experimental circuit.

Active CDS-Clamped L-Type Current-Fed Isolated DC-DC Converter

  • Nguyen, Minh-Khai;Duong, Truong-Duy;Lim, Young-Cheol;Choi, Joon-Ho
    • Journal of Power Electronics
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    • v.18 no.4
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    • pp.955-964
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    • 2018
  • In this paper, an active capacitor-diode-switch (CDS) snubber is proposed for L-type current-fed isolated DC-DC converters. The proposed CDS-clamped converter has a number of advantages. It can achieve wide range zero-voltage switching (ZVS) on two switches, a continuous input current with a low ripple, a reduction of one active switch and high efficiency. The operating principles, analysis and parameter design guideline are presented. A 300 W prototype is built to test the proposed converter. Simulation and experimental results are shown at 30 V input voltage and 400 V output voltage.