• Title, Summary, Keyword: High-efficient power

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High efficient welding technology of the offshore wind power plants (해상풍력 발전설비의 고능률 용접기술)

  • Kim, Youngsik;Kil, Sangcheol
    • Journal of Welding and Joining
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    • v.33 no.3
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    • pp.4-11
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    • 2015
  • The offshore wind power plants are watched as a new market to accomplish the needed energy, bringing technical and economical challenges. Advanced countries in the field of wind industry are now appling the 600 MPa, 150~200 mm thick high strength steel to offshore wind power plants. Moreover, the high efficient welding methods which is weldable ultra tick high strength steel with 1 pass welding are developed and applied in manufacturing the offshore wind tower. This article deals with the present world wide status of offshore power plants and the tendency of the development of high efficient welding technology for constructing the offshore wind tower. This article intends to offer the materials for development and raising of the domestic offshore wind power technology.

Highly Power-Efficient Rack-Level DC Power Architecture Combined with Node-Level DC UPS

  • Kwon, Won-Ok;Seo, Hae-Moon;Choi, Pyung
    • ETRI Journal
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    • v.33 no.4
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    • pp.648-651
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    • 2011
  • This letter presents a highly efficient rack-level DC power architecture combined with a node-level DC uninterruptible power supply (UPS). The proposed system can provide almost the equivalent power efficiency of a high-voltage DC data center without any change in the existing power infrastructure. The node-level DC UPS combined with a power distribution board provides high power efficiency as well as lower UPS installation costs. Implemented on a rack, the entire power system can be monitored through a network.

Study on the Design of High Efficient Class-E Power Amplifier and Resonant Coils for High Efficient Wireless Power Transfer System (고효율 무선 전력 전송을 위한 고효율 E급 전력 증폭기 및 공진 코일 설계에 관한 연구)

  • Youn, Choong-Mo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.10
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    • pp.935-940
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    • 2016
  • Recently, wireless power transmission system is gradually extended to technology in various fields such as lighting field, electric vehicles and smartphones wireless charging system. The largest of the two elements for high transmission efficiency of the wireless power transmission system are resonant coils and power amplifiers. In this paper, in order to build a high efficient wireless power transmission system, we introduce the resonance coil manufacturing method and high efficiency power amplifier design method that operates at 6.78MHz.

Feed Optimization for High-Efficient Machining in Turning Process (선삭 공정에서의 고능률 가공을 위한 이송량의 최적화)

  • Kang, You-Gu;Cho, Jae-Wan;Kim, Seok-Il
    • Proceedings of the KSME Conference
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    • pp.1338-1343
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    • 2007
  • High-efficient machining, which means cutting a part in the least amount of time, is the most effective tool to improve productivity. In this study, a new feed optimization method based on the cutting power regulation was proposed to realize the high-efficient machining in turning process. The cutting area was evaluated by using the Boolean intersection operation between the cutting tool and workpiece. And the cutting force and power were predicted from the cutting parameters such as feed, depth of cut, spindle speed, specific cutting force, and so on. Especially, the reliability of the proposed optimization method was validated by comparing the predicted and measured cutting forces. The simulation results showed that the proposed optimization method could effectively enhance the productivity in turning process.

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Highly Efficient High-Voltage MOSFET Converter with Bidirectional Power Flow Legs

  • Ryu, Hyung-Min
    • Journal of Power Electronics
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    • v.14 no.2
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    • pp.265-270
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    • 2014
  • In terms of power loss, a MOSFET has two advantages over an IGBT with an antiparallel diode: purely resistive without an offset voltage in conduction and no tail current at turn-off. However, the reverse recovery characteristic of the body diode is so poor that MOSFETs have not yet been available for high-voltage power converters with bidirectional power flow legs. This paper introduces how MOSFETs can be fully applied to high-voltage power converters with bidirectional power flow legs in order to achieve high efficiency. With a bidirectional DC-DC converter with one leg as the simplest example, the basic circuit topology and operating principle are described in detail. The high efficiency and stable operation of the proposed converter are validated through experiments with a 1.5 kW prototype.

Dielectric Barrier Discharge for Ultraviolet Light Generation and Its Efficient Driving Inverter Circuit

  • Oleg, Kudryavtsev;Ahmed, Tarek;Nakaoka, Mutsuo
    • KIEE International Transactions on Electrophysics and Applications
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    • v.4C no.3
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    • pp.101-105
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    • 2004
  • The efficient power MOSFET inverter applied for a simple and low cost power supply is proposed for driving the dielectric barrier discharge (DBD) lamp load. For decades, the DBD phenomenon has been used for ozone gas production in industry. In this research, the ultraviolet and visible light sources utilizing the DBD lamp is considered as the load for solid-state high frequency power supply. It is found that the simple voltage-source single-ended quasi-resonant ZVS inverter with only one active power switch could effectively drive this load with the output power up to 700 W. The pulse density modulation based control scheme for the single-ended quasi-resonant ZVS inverter using a low voltage and high current power MOSFET switching device is proposed to provide a linear power regulation characteristic in the wide range 0-100% of the full power as compared with the conventional control based Royer type parallel resonant inverter type power supplies.

Energy-efficient C-dump Converter for SRM Drives with Power Factor correction (역률개선과 고효율을 위한 스위치드 릴럭터스 전동기의 구동 시스템)

  • Yoon Yong-Ho;Lee Tae-Won;Song Sang-Hoon;Kim Yuen-Chung;Won Chung-Yuen
    • Proceedings of the KIPE Conference
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    • pp.214-218
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    • 2004
  • Switched Reluctance Motor (SRM) offers the advantages of simple and robust motor construction, high speeds and high efficiencies over a wide operating range of torque and speed, excellent controllability. However, SRM has the disadvantages of high current harmonics, and low power factor because of a capacitor filter is inserted in the power converter and inductance of SRM is high, it has pulse waveform of current. This paper deals with an energy efficient converter fed SRM system with the reduced harmonics and improved power factor and with higher efficiency. The validity of the proposed scheme is verified via experiment. We are implemented the proposed control system using 80C196KC micro-controller.

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An Efficient Interpolation FIR Filter Using LUT

  • Kim, Dae-Ik;Lee, Chang-Ki
    • Journal of information and communication convergence engineering
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    • v.7 no.2
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    • pp.219-222
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    • 2009
  • An efficient interpolation FIR filter structure for high-density and low-power electronic devices is proposed. The proposed structure is based on polyphase decomposition property and look-up table method. By computer-aided design simulations, it is shown that the use of the proposed method can result in reduction in the number of gates by 54% and can reduce power consumption by 9%.

A Research of Power-Efficient Driving Scheme for Auto-Focus on Image Sensor Module (이미지 센서 모듈을 위한 자동-초점 기능의 전력-효율적인 구동 방법에 대한 연구)

  • Cha, Sang-Hyun;Park, Chan-Woo;Lee, Yuen-Joong;Hwang, Byoung-Won;Kwon, Oh-Jo;Park, Deuk-Hee;Kwon, Kyoung-Soo;Lee, Jae-Shin;Hwang, Shin-Hwan
    • Journal of Institute of Control, Robotics and Systems
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    • v.15 no.12
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    • pp.1197-1202
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    • 2009
  • We present a power-efficient driving scheme that consists of piezoelectric actuator and driver IC for AF (Auto-Focus) on ISM (Image Sensor Module). The piezoelectric actuator is more power-efficient than conventional voice coil motor actuator. And high power-efficiency driver IC is designed. So the proposed driving scheme using designed piezoelectric actuator and driver IC is more close to recent trend of green IT. The diver IC should guarantee fast and accurate performance. So, the optimum driving method and high accurate frequency synthesizer are proposed. The die area of designed driver IC is $2.0{\times}1.6mm^2$ and power consumption is 2.8mW.

Class E Power Amplifiers using High-Q Inductors for Loosely Coupled Wireless Power Transfer System

  • Yang, Jong-Ryul;Kim, Jinwook;Park, Young-Jin
    • Journal of Electrical Engineering and Technology
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    • v.9 no.2
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    • pp.569-575
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    • 2014
  • A highly efficient class E power amplifier is demonstrated for application to wireless power transfer system. The amplifier is designed with an L-type matching at the output for harmonic rejection and output matching. The power loss and the effect of each component in the amplifier with the matching circuit are analyzed with the current ratio transmitted to the output load. Inductors with a quality factor of more than 120 are used in a dc feed and the matching circuit to improve transmission efficiency. The single-ended amplifier with 20 V supply voltage shows 7.7 W output power and 90.8% power added efficiency at 6.78 MHz. The wireless power transfer (WPT) system with the amplifier shows 5.4 W transmitted power and 82.3% overall efficiency. The analysis and measurements show that high-Q inductors are required for the amplifier design to realize highly efficient WPT system.