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

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Self Oscillation DC/DC Converter with High Voltage Step Up Ratio (고전압 변환비의 자려 발진 DC/DC Converter)

  • Jung, Yong-Joon;Han, Sang-Kyoo;Hong, Sung-Soo;Roh, Chung-Wook
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.3
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    • pp.220-227
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    • 2009
  • A self oscillation DC/DC converter which has a very desirable characteristics of the high input-output voltage conversion ratio for high voltage DC power supply applications is proposed in this paper. The proposed converter is composed of one power switch, one inductor, several capacitors and diodes. Compared with conventional high-voltage DC/DC converters, it performs the high- voltage power conversion using the inductor instead of the bulky step-up transformer. Therefore, it can reduce the size of magnetic device and save the cost. Moreover, since it needs no control IC by using self oscillation circuit and has lower voltage stress on output diodes, it features a lower cost, simpler structure and more improved performance. Finally, a comparative analysis and experimental results are presented to show the validity of the proposed converter.

A Novel Boost DC-DC Converter using High Frequency Coupled Inductor Series Resonant ZCS-PFM Chopper Control Method (고주파 결합 인덕터 직렬 공진형 ZCS-PFM 초퍼 제어 방식을 이용한 새로운 승압형 DC-DC 컨버터)

  • Kim, Hong-Shin;Heo, Young-Hwan;Mun, Sang-Pil;Park, Han-Seok
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.66 no.2
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    • pp.63-68
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    • 2017
  • This paper proposes a new non-isolated DC conversion circuit topology of the voltage source coupled inductor series resonant high-frequency PFM controlled boost chopper type DC-DC power converter using two in one IGBT power module, which can efficiently operate under a principle of zero current soft switching for wide output regulation voltage setting ranges and wide fluctuation of the input DC side voltage as well as the load variation ranges. Its steady state operating principle and the output voltage regulation characteristics in the open-loop-based output voltage control scheme without PI controller loop are described and evaluated from theoretical and experimented viewpoints. Finally, in this paper the computer-aided simulation steady-state analysis and the experimental results are presented in order to prove the effectiveness and the validity of voltage regulation characteristics of the proposed series resonant zero current soft switching boost chopper type DC-DC power converter circuit using IGBTs which is based on simple pulse frequency modulation strategy more than, 20kHz.

The Application Method of DC Distribution in Microgrid (마이크로그리드의 직류 배전 적용 방안)

  • Lee, Soon-myung;Kim, Jeong-Uk
    • Journal of Energy Engineering
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    • v.25 no.1
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    • pp.92-99
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    • 2016
  • In this paper, After the Paris climate conference (COP21) in December 2015, 195 countries adopted the first-ever universal, legally binding global climate deal. As sustained increase of renewable energy and digital load, to implemented and operated Microgrid system's power distribution by DC power distribution. This reduce the loss of power conversion step occurring based on the AC power distribution system and eliminate the loss caused by the reactive power in power distribution system. For this reason, DC Microgrid will be extended to support evidence of National energy policies, Microgrid project status, DC distribution status, and to suggest process of DC power distribution in Microgrid construction project.

A New Single-Stage PFC AC/DC Converter with Low Link-Capacitor Voltage

  • Lee, Byoung-Hee;Kim, Chong-Eun;Park, Ki-Bum;Moon, Gun-Woo
    • Journal of Power Electronics
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    • v.7 no.4
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    • pp.328-335
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    • 2007
  • A conventional Single-Stage Power-Factor-Correction (PFC) AC/DC converter has a link capacitor voltage problem under high line input and low load conditions. In this paper, this problem is analyzed by using the voltage conversion ratio of the DC/DC conversion cell. By applying this analysis, a new Single-Stage PFC AC/DC converter with a boost PFC cell integrated with a Voltage-Doubler Rectified Asymmetrical Half-Bridge (VDRAHB) is proposed. The proposed converter features good power factor correction, low current harmonic distortions, tight output regulations and low voltage of the link capacitor. An 85W prototype was implemented to show that it meets harmonic requirements and standards satisfactorily with near unity power factor and high efficiency over universal input.

Switched Capacitor Based High Gain DC-DC Converter Topology for Multiple Voltage Conversion Ratios with Reduced Output Impedance

  • Priyadarshi, Anurag;Kar, Pratik Kumar;Karanki, Srinivas Bhaskar
    • Journal of Power Electronics
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    • v.19 no.3
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    • pp.676-690
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    • 2019
  • This paper presents a switched capacitor (SC) based bidirectional dc-dc converter topology for high voltage gain applications. The proposed converter is able to operate with multiple integral voltage conversion ratios based on user input. The architecture of a user-friendly, inductor-less multi-voltage-gain bidirectional dc-dc converter is proposed in this study. The inductor-less or magnetic-less design of the proposed converter makes it effective in higher temperature applications. Furthermore, the proposed converter has a reduced component count and lower voltage stress across its switches and capacitors when compared to existing SC converters. An output impedance analysis of the proposed converter is presented and compared with popular existing SC converters. The proposed converter is simulated in the OrCAD PSpice environment and the obtained results are presented. A 200 W hardware prototype of the proposed SC converter has been developed. Experimental results are presented to validate the efficacy of the proposed converter.

Design and Control Method of Full-bridge DC-DC Converter for Electrolyzer (전기분해수조를 위한 풀-브릿지 DC-DC 컨버터의 설계와 제어 방법)

  • Lee, Byoung-Seoup;Yoon, Tae-Min;Kim, Jong-Hoon;Lee, Kyo-Beum
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.4
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    • pp.552-559
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    • 2015
  • Hydrogen is commonly used in many industrial field. However, hydrogen should be filled in a high pressure container to use it. Therefore, many researches have been conducted about an electrolyzer. The operating principle of the electrolyzer is that the electrolyzer can separate water molecules into hydrogen and oxygen. To use the electrolyzer, a power conversion system is needed because the current of the electrolyzer increases exponentially depending on the voltage of the electrolyzer. Thus, this paper proposes the power conversion system for the electrolyzer using a full-bridge DC-DC converter topology.

Wireless Power Transmission High-gain High-Efficiency DC-AC Converter Using Harmonic Suppression Filter (고조파 억제 필터를 이용한 무선전력전송 고이득 고효율 DC-AC 변환회로)

  • Hwang, Hyun-Wook;Choi, Jae-Won;Seo, Chul-Hun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.49 no.2
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    • pp.72-75
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    • 2012
  • In this paper, high-efficiency DC-AC converter is implemented for the wireless power transmission. The DC-AC converter is implemented by combining the oscillator and power amplifier. Because the conversion efficiency of wireless power transmitter is strongly affected by the efficiency of power amplifier, the high-efficiency power amplifier is implemented by using the Class-E amplifier structure. Also, because the output power of oscillator connected to the input stage of power amplifier is low, high-gain two-stages power amplifier using the drive amplifier is implemented to realize the high-output power DC-AC converter. The dual band harmonic suppression filter is implemented to suppress 2nd, 3rd harmonics of 13.56 MHz. The output power and conversion efficiency of DC-AC converter are 40 dBm and 80.2 % at the operation frequency of 13.56 MHz.

Control Method of Low Voltage DC/DC Converter for HEV (하이브리드 자동차용 저전압 DC/DC 컨버터 제어 방법)

  • Moon, Jung-Song;Lee, Jung-Hyo;Lee, Taeck-Kie;Won, Chung-Yeun
    • Proceedings of the KIPE Conference
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    • pp.598-599
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    • 2010
  • Low Voltage DC/DC Converter(LDC) is the power conversion unit for suppling the power to the auxiliary battery and the electric loads on vehicle. LDC has the capabilities of stability and efficient control method so that the electric loads are fully functional. This paper proposes a control method based on one PI-controller and verifies the stable performance from simulation.

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DC voltage control by drive signal pulse-width control of full-bridged inverter

  • Ishikawa, Junichi;Suzuki, Taiju;Ikeda, Hiroaki;Mizutani, Yoko;Yoshida, Hirofumi
    • 제어로봇시스템학회:학술대회논문집
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    • pp.255-258
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    • 1996
  • This paper describes a DC voltage controller for the DC power supply which is constructed using the full-bridged MOS-FET DC-to-RF power inverter and rectifier. The full-bridged MOS-FET DC-to-RF inverter consisting of four MOSFET arrays and an output power transformer has a control function which is able to control the RF output power when the widths of the pulse voltages which are fed to four MOS-FET arrays of the fall-bridged inverter are changed using the pulse width control circuit. The power conversion efficiency of the full-bridged MOS-FET DC-to-RF power inverter was approximately 85 % when the duty cycles of the pulse voltages were changed from 30 % to 50 %. The RF output voltage from the full-bridged MOS-FET DC-to-RF inverter is fed to the rectifier circuit through the output transformer. The rectifier circuit consists of GaAs schottky diodes and filters, each of which is made of a coil and capacitors. The power conversion efficiency of the rectifier circuit was over 80 % when the duty cycles of the pulse voltages were changed from 30 % to 50 %. The output voltage of the rectifier circuit was changed from 34.7V to 37.6 V when the duty cycles of the pulse voltages were changed from 30 % to 50 %.

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Direct Conversion receiver adapting DC offset free diode mixer (직접 변환수신기 (direct conversion receiver)에 적합한 DC offset이 없는 주파수 변환기를 채용한 직접변환 수신기의 설계)

  • 박필재;유현규;조한진
    • Proceedings of the IEEK Conference
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    • pp.361-364
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    • 2000
  • One of the problems using DCR(Direct Conversion Receiver) are DC offset, poor channel selectivity. APDP(Anti Parallel Diode Pair) can be good candidate for DCR frequency mixer due to its inherent End harmonic suppression. APDP shows good IP2 and DC suppression. This paper describe single APDP LO power characteristics, IP2, and receiver structure utilizing APDP frequency mixer

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