• Title/Summary/Keyword: DC home power supply system

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Robust Safety Circuits for DC Powered Home Appliances in Transient State

  • Ahn, Jung-Hoon;Kim, Yun-Sung;Lee, Byoung-Kuk
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.1967-1977
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    • 2014
  • In this paper, for the development of a safe and reliable DC home appliance suitable for DC home power supply system, we classified a number of inherent problems with help of the comparative analysis of existing AC and new DC home appliance. Several new technical problems of DC home appliances are mainly linked to the DC transient state. Among them, this paper concentrates on start-up inrush current problem, uni-polarity problem, and heavy DC load control problem. And to address these problems, we herein present an implementation of robust safety circuits for DC home appliances. Specifically, we investigate several multi-circuit countermeasures and select the best among them through comparative evaluation, based on theoretical, simulational, and experimental results.

A Study on Residential Hybrid Distribution System for Reducing Power Conversion Loss (전력 변환 손실 저감을 위한 하이브리드 주거배전시스템)

  • Byen, Byeng-Joo;Seo, Hyun-Uk;Choi, Jung-Muk;Lee, Young-Jin;Choe, Gyu-Ha
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.5
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    • pp.413-421
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    • 2013
  • This paper proposes residential hybrid distribution system that can supply AC power and DC power to AC load and DC load at the same time. This hybrid distribution system consists of three parts: bidirectional inverter, step-up converter and step-down converter. Also that is used to supply voltage to home application is classified of AC load and DC load as load characteristics. The performance of proposed hybrid distribution system is validated through the hardware implementation and the experimental results.

Contactless Power Supply for DC Power Service in Hybrid Home Generation System (수용가 직류 서비스를 위한 무접점 전원장치)

  • Chung, Bong-Geun;Kang, Sung-In;Kim, Yoon-Ho;Kim, Eun-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.2
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    • pp.174-182
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    • 2007
  • Among the alternative energy sources, the solar energy is recognized as an important energy source and its application is increasing. Especially in future, the hybrid solar energy generation system with battery will be widely used as an independent distributed power generation system. In this paper, a solar power hybrid home generation system using a contactless power supply (CPS) that can transfer an electric power without any mechanical contact by using magnetic coupling instead of the power transfer by directly supplying the DC power to the home electric system is proposed. The proposed system consists of a ZVS boost converter, a half bridge LLC resonant converter and contact-less transformer.

Contactless Power Supply for DC Power Service in Hybrid Home Generation System (직류수용가 서비스를 위한 무접점 전원장치)

  • Kang, J.W.;Song, H.K.;Kim, J.H.;Kim, E.S.;Kim, Y.H.
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.104-107
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    • 2007
  • Among the alternative energy sources, the solar energy is recognized as an important energy source and its application is increasing. Especially in future, the hybrid solar energy generation system with battery will be widely used as an independent distributed power generation system. In this paper, a solar power hybrid home generation system using a contact-less power supply (CPS) that can transfer an electric power without any mechanical contact by using magnetic coupling instead of the power transfer by directly supplying the DC power to the home electric system is proposed. The proposed system consists of a ZVS boost converter, a half bridge LLC resonant converter and contact-less transformer.

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A Contactless Power Supply for a DC Power Service

  • Kim, Eun-Soo;Kim, Yoon-Ho
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.4
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    • pp.483-491
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    • 2012
  • It is expected that, in the future, DC power service will be widely used for photovoltaic home power generation systems, since DC consuming devices are ever increasing. Instead of using multiple converters to convert DC to AC and then AC to DC, the power service could solely be based on DC. This would eliminate the need for converters, reducing the cost, complexity, and possibly increasing the efficiency. However, configuration of direct DC power service with mechanical contacts can cause spark voltage or an electric shock when the switch is turned on and off. To solve these problems, in this paper, a contactless power supply for a DC power service that can transfer electric power produced by photovoltaics to the home electric system using magnetic coupling instead of mechanical contacts has been proposed. The proposed system consists of a ZVS boost converter, a half-bridge LLC resonant converter, and a contactless transformer. This proposed contactless system eliminates the use of DC switches. To reduce the stress and loss of the boost converter switching devices, a lossless snubber with coupled inductor is applied. In this paper, a switching frequency control technique using the contactless voltage sensing circuit is also proposed and implemented for the output voltage control instead of using additional power regulators. Finally, a prototype consisted of 150W boost converter has been designed and built to demonstrate the feasibility of the proposed contactless photovoltaic DC power service. Experimental results show that 74~83% overall system efficiency is obtained for the 10W~80W load.

The DC/DC Converter having the current source applying the new switching pattern (새로운 스위치 패턴을 적용한 전류원을 갖는 DC/DC 컨버터)

  • Kim, Sun-Pil;Ko, Hyun-Swok;Kim, Se-Min;Park, Seong-Mi;Park, Sung-Jun
    • Journal of the Korean Society of Industry Convergence
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    • v.20 no.4
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    • pp.275-284
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    • 2017
  • As the high-level of the industrial and information age, the electricity become the indispensable element in the daily life including OA, FA, and computer, electric home appliances, and etc. In particular, The continuous use of the high capacity power supply system by applying a Switching Mode Power Supply(SMPS) according to the increase of the secondary side output terminal of the power load of the refrigerator of the home appliance or automation of the plant is pressed. The purpose using the way with this kind of high-capacity altogether is to supply the output voltage and output current regardless of the input voltage or to the external environmental conditions of the secondary-side load fluctuation. In this paper, a combination of a Buck Converter with Boost Converter by making a constant current source to control the inductor current and maintain stable power supply side operating characteristics, when load variations. While maintaining the same characteristics as conventional Buck Converter, and offer a DC-DC Converter system with the new switch pattern having a wide output range capable of operating in Buck-Boost Converter. In addition, after theoretical analysis, we carry out simulations and experiments to verify the validity and performance comparing with a conventional DC-to-DC converter.

DC Appliance Safety Standards Guideline through Comparative Analysis of AC and DC Supplied Home Appliances

  • Ahn, Jung-Hoon;Kim, Dong-Hee;Lee, Byoung-Kuk;Jin, Hyun-Cheol;Shim, Jae-Sun
    • Journal of Electrical Engineering and Technology
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    • v.7 no.1
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    • pp.51-57
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    • 2012
  • This paper provides a safety guideline for DC supplied home appliances through the comparative analysis of existing safety guideline for AC supplied home appliances. For this purpose, a predictive DC home appliance model is suggested and in special international safety standards of AC appliances are also analyzed. Moreover, a DC distribution system is built to verify the validity of the proposed safety guideline. The detailed analyzing process is explained with help of informative experimental results.

6kW V2H Power Converter Using Isolated CLLC DAB Converter

  • Ko, Hyun-Seok;Hwangbo, Chan;Park, Seong-Mi;Park, Sung-Jun
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.4_1
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    • pp.493-504
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    • 2022
  • Recently, as interest in eco-friendliness grows, the supply of hybrid electric vehicles and pure electric vehicles (EVs) for improving fuel efficiency of automobiles is rapidly expanding. The average daily energy consumption of electric vehicles is less than 20 [%] of the total ESS capacity of the vehicle, and research on additional functions using the ESS of the vehicle is urgently needed to expand the supply of electric vehicles. V2H(Vehicle to Home), like V2G(Vehicle to Grid), includes the concept of cooperating with system stabilization using ESS of electric vehicles. In addition, it includes various operations that can realize home welfare, such as uninterrupted power supply in case of power outage at home, and power supply for home DC devices. Therefore, in order to expand the supply of eco-friendly electric vehicles, it is urgently required to develop a V2H system with various functions that can realize home welfare. In this paper, we propose a V2H system with a CLLC resonant converter and a non-isolated step-up converter that can solve different impedance and resonant frequencies depending on the power transfer direction. The proposed V2H system is 6 [kVA] applicable to 150-450 [V], the voltage range that can use the ESS voltage for electric vehicles, and is designed with a capacity that can handle instantaneous electricity use at home. In addition, in order to verify the feasibility, an experiment by Psim simulation and prototype production was performed.

Effect of Interference from DC Power Supply on Power Line Communication Channel (전력선 통신 채널에서 직류전원 공급장치의 간섭 영향)

  • Kim, Sungeon;Jeon, Taehyun
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.14 no.5
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    • pp.111-115
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    • 2014
  • Power line communications can be utilized to build up the data transmission network wherever the electricity is available. This type of communication system could provide a basis for the network construction in many application areas which include the smart grid and home networks. On the other hand the power line communication is vulnerable to various types of interferences and noises. Also, its channel characteristics are constantly changing depending on the type and the amount of electrical loads connected to the network. Especially, the usage of DC power supply has been increased due to the explosive expansion of smart devices in our daily lives which result in the increased level of interferences on the power line channel. In this paper, the effect of the operation of the DC power supplies on the channel characteristics and the data transmission performance is analyzed through the experiments.

A Wideband Down-Converter for the Ultra-Wideband System (초광대역 무선통신시스템을 위한 광대역 하향 주파수 변환기 개발에 관한 연구)

  • Kim Chang-Wan;Lee Seung-Sik;Park Bong-Hyuk;Kim Jae-Young;Choi Sang-Sung;Lee Sang-Gug
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.2 s.93
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    • pp.189-193
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    • 2005
  • In this paper, we propose a direct conversion double-balanced down-converter fer MB-OFDM W system, which is implemented using $0.18\;{\mu}m$ CMOS technology and its measurement results are shown. The proposed down-converter adopts a resistive current-source instead of general transconductance stage using MOS transistor to achieve wideband characteristics over RF input frequency band $3\~5\;GHz$ with good gain flatness. The measured conversion gain is more than +3 dB, and gain flatness is less than 3 dB for three UWB channels. The dc consumption of this work is only 0.89 mA from 1.8 V power supply, leading to the low-power W application.