• Title, Summary, Keyword: DC-DC power conversion

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Input-Series-Output-Parallel Connected DC/DC Converter for a Photovoltaic PCS with High Efficiency under a Wide Load Range

  • Lee, Jong-Pil;Min, Byung-Duk;Kim, Tae-Jin;Yoo, Dong-Wook;Yoo, Ji-Yoon
    • Journal of Power Electronics
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    • v.10 no.1
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    • pp.9-13
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    • 2010
  • This paper proposes an input-series-output-parallel connected ZVS full bridge converter with interleaved control for photovoltaic power conditioning systems (PV PCS). The input-series connection enables a fully modular power-system architecture, where low voltage and standard power modules can be connected in any combination at the input and/or at the output, to realize any given specifications. Further, the input-series connection enables the use of low-voltage MOSFETs that are optimized for a very low RDSON, thus, resulting in lower conduction losses. The system costs decrease due to the reduced current, and the volumes of the output filters due to the interleaving technique. A topology for a photovoltaic (PV) dc/dc converter that can dramatically reduce the power rating and increase the efficiency of a PV system by analyzing the PV module characteristics is proposed. The control scheme, consisting of an output voltage loop, a current loop and input voltage balancing loops, is proposed to achieve input voltage sharing and output current sharing. The total PV system is implemented for a 10-kW PV power conditioning system (PCS). This system has a dc/dc converter with a 3.6-kW power rating. It is only one-third of the total PV PCS power. A 3.6-kW prototype PV dc/dc converter is introduced to experimentally verify the proposed topology. In addition, experimental results show that the proposed topology exhibits good performance.

A Feasibility Study on DC Microgrids Considering Energy Efficiency (에너지 효율분석을 통한 DC 마이크로그리드의 타당성 검토)

  • Yu, Cheol-Hee;Chung, Il-Yop;Hong, Sung-Soo;Chae, Woo-Kyu;Kim, Ju-Yong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.9
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    • pp.1674-1683
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    • 2011
  • More than 80% of electric loads need DC electricity rather than AC at the moment. If DC power could be supplied directly to the terminal loads, power conversion stages including rectifiers, converters, and power adapters can be reduced or simplified. Therefore, DC microgrids may be able to improve energy efficiency of power distribution systems. In addition, DC microgrids can increase the penetration level of renewable energy resources because many renewable energy resources such as solar photovoltaic(PV) generators, fuel cells, and batteries generate electric power in the form of DC power. The integration of the DC generators to AC electric power systems requires the power conversion circuits that may cause additional energy loss. This paper discusses the capability and feasibility of DC microgrids with regard to energy efficiency analysis through detailed dynamic simulation of DC and AC microgrids. The dynamic simulation models of DC and AC microgrids based on the Microgrid Test System in KEPCO Research Institute are described in detail. Through simulation studies on various conditions, this paper compares the energy efficiency and advantages of DC and AC microgrids.

Design and analysis of RF-DC power conversion circuit (무선 전력변환장치의 전력변환 회로에 대한 설계 및 분석)

  • Kim, Yong-Sang;Im, Sang-Uk;Lee, Yong-Je;Kim, Yang-Mo
    • Proceedings of the KIEE Conference
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    • pp.35-42
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    • 2003
  • We have studied DC energy conversion of RF card by wireless communication. In order to attain an objective, it used the system which is a Rectenna. The main purpose of energy conversion system is the operation of the circuits at RF-ID system. The proposed RF-ID system is a lot classified with the reader and tag. Reader is a kind of the base station role supporting RF energy. And priority tag convert RF energy from the reader it was delivered with a wireless to DC energy. The energy which is converted like Tag. It transmits to the reader characteristic ID of each card. The tag is mainly divided into rectifier, power module, memory and controller. The FRAM maintains the data like a ROM in no-power situation. And the advantage is a low power element compared with other EEPROM. There are two considerations, when RF energy is converted into DC source by wireless. One is energy amount supported from the reader, the other is high power efficiency. This paper presents a study of simulation and experiments on the RF-DC conversion circuit in tag by the power efficiency concentrated.

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DC-DC Converter for Integrated Voltage Control Method (전압 적분 제어법에 의한 DC-DC 컨버터)

  • 이현우;서기영
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.18 no.10
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    • pp.1590-1597
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    • 1993
  • Power conversion system generally requires bidirectional converter. A storage energy of reactor is suppressed by regeneration of surplus electic energy in converter to power source. When an electric isolation in the power conversion system is required. the most suitable position for the isolation is the DC-Link part. A transformer in the DC part is minimized because of high repetition frequency. This paper proposes that power conversion system becomes bidirectional DC-DC converter with electric isolation by intergrated voltage control method. It is intergrated voltage control that makes system construciton simple, has control errow little quantity ans gets output response Quick. And the power-switches which should be operated is selected automatically without a detection of the current-direction.

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Evaluation and Optimization of Power Electronic Converters using Advanced Computer Aided Engineering Techniques

  • Oza, Ritesh;Emadi, Ali
    • Journal of Power Electronics
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    • v.3 no.2
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    • pp.69-80
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    • 2003
  • Computer aided engineering (CAE) is a systematic approach to develop a better product/application with maximum possible options and minimum transition time. This paper presents a comprehensive feasibility analysis of various CAE techniques for evaluation and optimization of power electronic converters and systems. Different CAE methods for analysis, design, and performance improvement are classified. In addition, their advantages compared to the conventional workbench experimental methods are explained in detail and through examples.

Characteristic of Three-Phase Voltage Type Soft-Switching Inverter using the Novel Active Auxiliary Resonant DC Link Snubber (새로운 액티브 보조 공진 DC 링크 스너버를 이용한 3상 전압형 소프트 스위칭 인버터의 특성)

  • Sung, Chi-Ho;Heo, Young-Hwan;Mun, Sang-Pil;Park, Han-Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.2
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    • pp.114-121
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    • 2016
  • This paper is Instant space vector PWM(Pulse Width Modulation)power conversion devices in switching power semiconductors from my generation to losses and switching when the voltage surge and current surge of electronic noise(EMI: Electro Magnetic Interference / RFI: Radio Frequency Interference)to effectively minimize the power soft-switching power conversion circuit topologies of auxiliary resonant DC tank for the purpose of high performance realization of the electric power conversion system by the high-speed switching of a semiconductor device(AQRDCT simultaneously : an active auxiliary resonance using auxiliary Quasi-resonant DC tank)DC link snubber switch has adopted a three-phase voltage inverter. AQRDCL proposed in this paper can reduce the effective and current peak stress of the power semiconductors of the auxiliary resonant snubber circuit compared to the conventional active-resonant DC link snubber, it is not necessary to install the clamp switch of the auxiliary resonant DC link, DC the peak current and power loss of the bus line can be reduced.

Analysis of Emission Characteristics of DC/DC Converter by Component Placement (부품배치에 따른 DC/DC 컨버터의 Emission 특성분석)

  • Park, Jin-Hong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.2
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    • pp.639-643
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    • 2018
  • As electronic systems become smaller and more portable, the need for power conversion continues to increase. In addition, system stability must be ensured from switching noise due to power conversion efficiency and power conversion system miniaturization. Therefore, countermeasures to reduce switching noise during power conversion are essential. In this paper, a DC/DC buck converter circuit is constructed, and the characteristics of switching noise generated when changing the parts layout in a four-layer printed circuit board (PCB) structure with a reference plane are compared and analyzed. In addition, switching noise characteristics were compared and analyzed through simulations when the parts layout was different in a two-layer PCB structure from which the reference planes were removed. As a result, it was confirmed that the radiated emissions characteristic is reduced by 12dB and the conducted emissions characteristic decreased by 7dB to 8dB, according to the current return path in the four-layer PCB structure. Thus, it was confirmed that the noise characteristics can be improved according to the configuration of the current return path when the power conversion circuit is designed.

DC-DC Converter Using a Coreless Printed Circuit Board (PCB) Transformer (코어 없는 PCB 변압기를 이용한 DC-DC 컨버터)

  • 황선민;안태영;최병조
    • Proceedings of the IEEK Conference
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    • pp.9-12
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    • 2000
  • This paper describes the modeling and experimental results of coreless printed circuit board (PCB) based transformer that can be used for power conversion at high frequency operation. The principle of using coreless PCB based transformer in 2MHz, 10W class ZVS Flyback DC-DC converter has been successfully demonstrated. The maximum power conversion efficiency is 79%. Even for high operating frequency, an efficiency greater than 70% can be obtained with under 1% regulation error.

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Performance comparison of the RF-DC converter circuit for wireless power transmission (무선전력전송을 위한 RF-DC 변환기 회로의 성능비교)

  • Choi, Ki-Ju;Hwang, Hee-Yong
    • Journal of Industrial Technology
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    • v.29 no.B
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    • pp.145-149
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    • 2009
  • A RF-DC converter is one of the most important components for a wireless power transmission. It has been developed for many applications such as space solar power system, and Radio Frequency Identification(RFID). In this paper, we designed three types of RF-DC converter and compare the performance of each. All types RF-DC convertoer have a maximum conversion efficiency at input power level of 0 dBm~5 dBm and RF-DC converter of third type was the best performance that has a 21.9% of conversion efficiency.

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Polarity Inversion DC-DC Power Conversion Circuit with High Voltage Step-up Ratio

  • Roh, Chung-Wook;Yoo, Cheol-Hee;Jung, Dong-Yeol;Sak, Sug-Chin
    • Journal of Power Electronics
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    • v.11 no.5
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    • pp.669-676
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    • 2011
  • A novel polarity inversion dc-dc power conversion circuit that features the high input to output step-up voltage conversion ratio characteristics is presented for high voltage DC power supply applications. The proposed circuit features the reduced voltage stresses of the components compared to those of the conventional ones. The operational principles of the proposed circuit are analyzed and comparative features are presented. The simulation results and experimental results are presented to verify the validity of the proposed circuit.