• Title/Summary/Keyword: power regulation

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Single-Stage Single-Switched AC/DC Converter with Magnetic Coupled Nondissipative Snubber (자기결합 무손실 스너버를 갖는 새로운 고역률 단일전력단 AC/DC 컨버터)

  • 조정욱;문건우;정영석;윤명중
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.423-431
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    • 1997
  • A new single-stage/single-switched forward converter with magnetic coupled nondissipa-tive snubber is proposed. The proposed converter gives the good power factor correction (PFC), low current harmonic distortion, and tight output voltage regulation. The prototype shows the IEC 555-2 requirements are met satisfactorily with nearly unity power factor. This proposed converter with magnetic coupled nondissipative snubber is particularly suited for low power level power supply applications.

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An Integrated Single-Stage Zero Current Switched Quasi-Resonant Power Factor Correction Converter with Active Clamp Circuit (능동 클램프 회로를 적용한 단상 ZCS 공진형 역률개선 컨버터)

  • 이준영;문건우;고관본;윤명중
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.626-630
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    • 1999
  • A new integrated single-stage zero current switched(ZCS) quasi-resonant converter (QRC) for the power factor correction(PFC) converter is introduced in this paper. The power factor correction can be achieved by the discontinuous conduction mode(DCM) operation of an input current. The proposed converter has the characteristics of the good power factor, low line current harmonics, and tight output regulation. Furthermore, the ringing effect due to the output capacitance of the main switch can be eliminated by use of active clamp circuit.

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A Simple Three-Phase Single-Stage AC/DC Converter with Magnetic Energy Feedback Technique for Power Factor Correction (역률개선 위한 자기에어지 궤환기법의 간단한 삼상 단일전력단 AC/DC 컨버터)

  • 문건우;윤석호;윤종수;이기선;추진부
    • Proceedings of the KIPE Conference
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    • 1998.07a
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    • pp.438-443
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    • 1998
  • A simple single-stage AC/DC forward converter with transformer magnetic energy feedback technique for power factor correction is proposed. The operational principle of the proposed converter is presented. The proposed converter gives the good power factor correction, low line current harmonic distortions, and tight output voltage regulation. The prototype shows high power factor with low line current harmonics.

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Study on load tracking characteristics of closed Brayton conversion liquid metal cooled space nuclear power system

  • Li Ge;Huaqi Li;Jianqiang Shan
    • Nuclear Engineering and Technology
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    • v.56 no.5
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    • pp.1584-1602
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    • 2024
  • It is vital to output the required electrical power following various task requirements when the space reactor power supply is operating in orbit. The dynamic performance of the closed Brayton cycle thermoelectric conversion system is initially studied and analyzed. Based on this, a load tracking power regulation method is developed for the liquid metal cooled space reactor power system, which takes into account the inlet temperature of the lithium on the hot side of the intermediate heat exchanger, the filling quantity of helium and xenon, and the input amount of the heat pipe radiator module. After comparing several methods, a power regulation method with fast response speed and strong system stability is obtained. Under various changes in power output, the dynamic response characteristics of the ultra-small liquid metal lithium-cooled space reactor concept scheme are analyzed. The transient operation process of 70 % load power shows that core power variation is within 30 % and core coolant temperature can operate at the set safety temperature. The second loop's helium-xenon working fluid has a 65K temperature change range and a 25 % filling quantity. The lithium at the radiator loop outlet changes by less than ±7 K, and the system's main key parameters change as expected, indicating safety. The core system uses less power during 30 % load power transient operation. According to the response characteristics of various system parameters, under low power operation conditions, the lithium working fluid temperature of the radiator circuit and the high-temperature heat pipe operation temperature are limiting conditions for low-power operation, and multiple system parameters must be coordinated to ensure that the radiator system does not condense the lithium working fluid and the heat pipe.

Post Regulation Using Built-in Converters for Multiple Output SMPS (Built-in 컨버터를 이용한 다출력 SMPS의 Post Regulation)

  • Sung, Won-Yong;Cho, Nam-Jin;Oh, Chang-Yeol;Kim, Yun-Sung;Lee, Byoung-Kuk
    • Proceedings of the KIPE Conference
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    • 2013.11a
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    • pp.194-195
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    • 2013
  • 본 논문에서는 다출력 SMPS의 출력전압 레귤레이션을 개선하기 위한 post regulation 기법들에 대해 분석한다. 그리고 출력전압 레귤레이션을 위한 기법인 built-in 컨버터에 대해 제안하고, 그 특성에 대해 분석한다. 이를 토대로 시뮬레이션을 구성하여 다른 post regulation 기법들을 적용한 결과와 본 논문에서 제안한 built-in 컨버터를 적용한 결과를 비교/분석하여 제안한 기법의 타당성을 검증한다.

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Development of Fractional Slot Axial Flux Permanent Magnet Synchronous Generator with Low Cogging Torque and Reduced Voltage Regulation (분수슬롯을 가지는 축방향 자속형 영구자석 동기전동기의 코깅토크 및 전압리플 저감에 관한 연구)

  • Choi, Da-Woon;Li, Jian;Cho, Yun-Hyun
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1111-1112
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    • 2011
  • This paper investigated application of fractional-slot concentrated-winding axial flux permanent magnet machines for wind turbines. Design criteria of cogging torque and voltage regulation was firstly proposed for this kind of application. Fractional winding has small cogging torque which is highlight for wind turbines, but slot leakage inductance would increase voltage regulation, which is an important performance index of generators. By varying slot opening, cogging torque and slot leakage inductance could be adjusted. In this paper, cogging torque and inductances were calculated by both analytical and finite element methods. Voltage regulation was studied by two-axis model under unity-power-factor load and verified by transient finite element analysis.

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A Study on the Policy of Small and Medium Retail business in Advanced Country(I) (선진국 중소소매업 정책에 관한 연구(I))

  • Kim, Yoo-oh;Lee, Min-kweon;Youn, Myoung-kil
    • Journal of Distribution Science
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    • v.3 no.2
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    • pp.77-99
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    • 2005
  • In the business environment which enclosed the domestic small and d medium distribution industry, and a business sign of recovery, reduction of income, job insecurity, and a national pension an aging society - positive exhibition of the large-sized store in comparison with the low personal consumption depended uneasy and deregulation, and consumer needs progress of individualization diversification it is ultimately faced with a difficult situation. Therefore the seen research examine the various range of a circulation policy through precedence research. It is going to consider and see the influence which the circulation regulation means of the purpose of large-sized store regulation and a major power is compared, and regulation.

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Novel Multiple Output Converter using Quasi Load

  • Choi, Kyu-Sik;Hyun, Byeong-Chul;Lee, Seoung-Woon;Cho, Bo-Hyung
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.125-126
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    • 2010
  • In this paper, a novel multiple output converter using quasi load is proposed. Conventional multiple output converters using multi-winding transformer has poor output voltage regulations. To solve this problem, there are many proposals like post regulation method, weighted control method, and etc. However, the post regulation method regulates output voltage tightly but its conduction loss and cost are increased. And the weighted control can achieve high efficiency and low cost but its regulation is not enough. To solve these problems, this paper proposes a novel multiple output converter using quasi load. The proposed method uses a quasi load which acts like an active dummy load for tight regulation but there is rarely increase of loss and cost. The proposed method is verified by hardware test by two output(24V and 15V) flyback type converter.

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The Role of Nuclear Power in Korea under Carbon Emissions Regulation

  • Lee, Man-Ki;Kim, Seung-Su;Moon, Kee-Hwan
    • Proceedings of the Korean Nuclear Society Conference
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    • 1997.05b
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    • pp.651-656
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    • 1997
  • Efforts are made to examine the role nuclear energy under the international carbon emissions regulation. To do so, an econometric model for energy demand and supply is developed. Here, several scenarios on the regulation are assumed and then each scenario is analyzed by using this model. This model also makes it Possible to analyze the effect of carbon tax. The results show that share nuclear increases up to 60% in 2020 Instead 45% makes GDP rise by 1.9% while the electricity price lower by 46% in carbon emission regulation.

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Charge Copy Method for Reduction of Cross Regulation in SIDO Boost Converter (SIDO boost converter에서 크로스 레귤레이션을 줄이기 위한 전하 복사방법)

  • Hwang, Wonjune;Kim, Ju Eon;Baek, Kwang-Hyun
    • Journal of IKEEE
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    • v.20 no.4
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    • pp.432-434
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    • 2016
  • In conventional SIDO(Single Inductor Dual Output) boost converter, charging time is changed by load power consumption. In this case, if the power consumption of one load is changed to such a degree that switching frequency of the boost converter must be changed, another load charge time is also changed, which this causes cross regulation. In this paper, the charge copy technique is proposed to reduce cross regulation. When the switching frequency is changed to an integer ratio, another load charge time is also changed to integer ratio. Simulation result shows that proposed method reduces the 10.24mV cross regulation and 39.118us recover-time compared with conventional method.