• 제목, 요약, 키워드: junction box

검색결과 53건 처리시간 0.049초

자동차 정션박스의 열성능 개선을 위한 연구 (A Study of the Improvement of Thermal Performance of a Junction Box of a Passenger Car)

  • 이영림
    • 한국자동차공학회논문집
    • /
    • v.16 no.2
    • /
    • pp.136-142
    • /
    • 2008
  • Thermal management of a junction box of a passenger car has recently become more challenging due to its smaller size and larger current capacity. Thus, it is essential to perform the thermal optimization of a junction box in its design on an early stage of vehicle design. In this study, 3 dimensional CFD simulation with experimental measurement has been done to study for better thermal management of the junction box. First, the study of thermal characteristics of electric relays in the junction box has revealed that each surface of the relay has very different thermal resistance. In addition, an idea to install a cooling fan on the junction box has been studied and it was found that the forced cooling method was not effective on the system to keep the thermal resistance to the reasonable level of the junction box. Finally, the effect of external flows around the junction box on the temperatures of the relays, fuses, etc. has been studied and the result shows that the installation of the junction box at the proper place in an engine room can avoid any unnecessary overdesign in thermal management.

The Improvement of Junction Box Within Photovoltaic Power System

  • Sun, Ki-Ju;Cheon, Min-Woo
    • Transactions on Electrical and Electronic Materials
    • /
    • v.17 no.6
    • /
    • pp.359-362
    • /
    • 2016
  • In the PV (Photovoltaic) power system, a junction box collects the DC voltage generated from the PV module and transfers it to the PCS (power conditioning system). The junction box prevents damage caused by the voltage difference between the serially connected PV modules and provides convenience while repairing or inspecting the PV array. In addition, the junction box uses the diode to protect modules from the inverse current when the PV power system and electric power system are connected for use. However, by using the reverse blocking diode, heat is generated within the junction box while generating electric power, which decreases the generating efficiency, and causes short circuit and electric leakage. In this research, based on the purpose of improving the performance of the PV module by decreasing the heat generation within the junction box, a junction box with a built-in bypass circuit was designed/manufactured so that a certain capacity of current generated from the PV module does not run through the reverse blocking diode. The manufactured junction box was used to compare the electric power and heating power generated when the circuit was in the bypass/non-bypass modes. It was confirmed that the electric power loss and heat generation indicated a decrease when the circuit was in the bypass mode.

Reduction of Heat Generation from Junction Box in 3 kW Photovoltaic Power Generation System

  • Yun, Jung-Hyun;Sun, Ki-Ju;Cheon, Min-Woo
    • Transactions on Electrical and Electronic Materials
    • /
    • v.17 no.1
    • /
    • pp.21-24
    • /
    • 2016
  • A junction box used in a 3 kW photovoltaic power generation system plays a role in collecting and supplying the direct current voltage produced by photovoltaic modules to an inverter. It is also used for facilitating maintenance checks and protecting the module and inverter by keeping the voltage constant. As for the junction box, using it in a parallel connection creates a difference between the setup modules. In order to compensate, an inverse voltage diode is used. But the high-power created through the solar generator can be delivered to the inverter through the inverter regularly. Therefore, a component can break down due to excess heat. And consequently short circuits and electric leakage occurs. In this study, using a junction box that enabled the bypass of high electric power, it was possible to reduce heat generation by approximately 35℃ when compared to a standard junction box.

색상 검사와 템플릿 매칭을 이용한 정션 박스 자동 시각 검사 시스템 (Automated Visual Inspection System of Junction Box using Color Inspection and Template Matching)

  • 박병준;한광수;이호준
    • 한국멀티미디어학회논문지
    • /
    • v.13 no.3
    • /
    • pp.392-399
    • /
    • 2010
  • 자동차는 발명 초기 형태로 부터 많은 발전과 변형을 거듭하여 현재의 형태에 이르기 까지 인간의 활동 영역을 넓혀 주고 있다. 자동차의 전자 부품중 하나인 정션 박스를 종래에는 사람이 직접 육안으로 검사하여 오판을 하거나 검사의 속도가 느린 문제점이 있었다. 이를 보완하여 빠르고 정확하게 정션 박스 검사를 하기 위하여 비전 시스템(Vision System)을 이용하여 공정을 자동화 하는 방법을 제시하였다. 본 논문은 정션 박스에 삽입된 퓨즈(Fuse)와 릴레이(Relay)의 색상과 표면의 패턴을 검사하여 이상 유/무 및 결함을 자동으로 검사한다. 불량 검출의 성능을 평가하기 위하여 정션 박스를 가지고 시스템의 성능을 평가한 결과, 100%의 인식률을 나타내었고 이를 산업체에 적용하여 신속하고 정확한 검사가 가능함을 보였다.

차량 전원 안정성 향상을 위한 Diagnosis System 채택 Intelligent Smart Junction Box 개발 (Development of Diagnosis System Adopted Intelligent Smart Junction Box for Improving Vehicular Power Safety)

  • 정민수;김문겸;박영환;방순영
    • 전기학회논문지
    • /
    • v.57 no.2
    • /
    • pp.276-285
    • /
    • 2008
  • These days the automobile industry, which has rapidly progressed, has been an indispensable part in social and economic activities as well as its research and development have been activated in response to various needs of consumers and markets. The second and third generation control system, getting count on safety and convenience differently than early circuits, cause the hypertrophy of wire harness. The J/Box(Junction Box), which distributes power and wires, was developed to solve the problem. As vehicles have been better in quantity and intelligence, however, environment-friendly electric apparatus system has continuously increased and ITS(Intelligent Transport System) has been introduced in earnest. In result, wires got complicated and multilateral and also there has been a stronger probability that vehicles are out of order due to various problems including mechanical failure. In this study, ISJB(Intelligent Smart Junction Box) was introduced to solve the problem. The diagnosis system was applied to prevent the overload and short of ISJE. Also, the state of vehicles displayed so that drivers monitor it in motion. Likewise error data are saved in the memory so that such data can be analyzed retrospectively. The busbar was adopted in to the main power terminal and the part of power pattern was coverd by lead. Because ISJB is more sensitive to heat in comparison to the busbar type J/Box. With regard the circuits related with safe, alternative circuits were set up in order that electronic devices may be normally operated even when an error arises. ISJB is expected to improve the safety and quality of vehicles.

Study on the pressure self-adaptive water-tight junction box in underwater vehicle

  • Huang, Haocai;Ye, Yanying;Leng, Jianxing;Yuan, Zhuoli;Chen, Ying
    • International Journal of Naval Architecture and Ocean Engineering
    • /
    • v.4 no.3
    • /
    • pp.302-312
    • /
    • 2012
  • Underwater vehicles play a very important role in underwater engineering. Water-tight junction box (WJB) is one of the key components in underwater vehicle. This paper puts forward a pressure self-adaptive water-tight junction box (PSAWJB) which improves the reliability of the WJB significantly by solving the sealing and pressure problems in conventional WJB design. By redundancy design method, the pressure self-adaptive equalizer (PSAE) is designed in such a way that it consists of a piston pressure-adaptive compensator (PPAC) and a titanium film pressure-adaptive compensator (TFPAC). According to hydro-mechanical simulations, the operating volume of the PSAE is more than or equal to 11.6 % of the volume of WJB liquid system. Furthermore, the required operating volume of the PSAE also increases as the gas content of oil, hydrostatic pressure or temperature difference increases. The reliability of the PSAWJB is proved by hyperbaric chamber tests.

Wire-Grid 방법을 이용한 도체 상자에 부착된 선형 모노폴 안테나 해석 (A analysis of Thin-Straight Monopole antenna on a conducting box Using the Wire-Grid Method)

  • 이승엽;김경재;이영훈;허선종;박한규
    • 한국통신학회논문지
    • /
    • v.18 no.11
    • /
    • pp.1669-1676
    • /
    • 1993
  • 본 논문에서는 도체 상자에 부착된 선형 모노폴(thin-straight monopole) 안테나를 wire-grid방법을 적용하여 안테나 및 도체상자를 모델링하였고, 효율적인 계산을 위해 Pocklington 적분 방정식과 모멘트 방법(Moment Method)을 사용하여, 안테나의 특성 변화를 계산하였다. 안테나 및 모델링된 도체상자에 이용된 기저함수는 PWS(Piecewise Sinusoidal)함수이고, 도체상자의 모서리에 흐르는 전류를 효과적으로 표현하기 위해, 접합기저함수(Junction Basis Function)를 사용하였다. 특히, 모서리의 꼭지점에서 전류의 연속 조건을 만족하기 위해, 접합기저 함수가 중복되도록 하였다. 안테나 및 도체상자에 흐르는 전류분포를 계산하여, 입력 임피던스 및 복사패턴을 구하였고, 기존의 결과 데이터와 비교하였다.

  • PDF

자동차 스마트 정션 박스 소형화를 위한 0.18㎛ BCDMOS 기반 스위치 회로 설계 (Switch Circuit Design in 0.18㎛ BCDMOS for Small Form Factor Automotive Smart Junction Box)

  • 이욱준;권건오;임한상;신현철
    • 전자공학회논문지
    • /
    • v.52 no.3
    • /
    • pp.82-88
    • /
    • 2015
  • 본 논문에서는 자동차 스마트 정션 박스(Smart Junction Box: SJB)의 소형화를 위하여 기존에 단위소자로 구성되어 있던 Enable 스위치 회로의 ASIC화를 위한 연구를 수행하였다. Enable 스위치 회로는 점화신호(Ignition: IG)를 입력으로 받아 SJB를 구성하는 Linear Regulator 및 다른 구성요소의 구동을 위한 Enable 신호 전달 역할을 한다. $0.18{\mu}m$ BCDMOS 공정을 사용하여 회로를 설계하였으며, 설계된 회로는 시뮬레이션을 통해 AEC-Q100과 ISO 7637-2에 기술된 조건을 만족함을 검증하였다. 설계된 Enable 스위치 회로의 레이아웃 크기는 $1.67mm{\times}0.54mm$이며, $3mm{\times}3mm$ 크기의 HVSON8로 패키징 할 수 있다. ASIC화된 Enable 스위치 회로는 단위소자를 사용하여 Enable 스위치 회로를 구성하였을 때 보다 소요면적을 1/30 이상 축소할 수 있는 것으로 확인하였으며, 이를 통해 SJB 보드의 소형화에 기여할 것으로 기대할 수 있다.

PV모듈의 음영 상태 및 바이패스 다이오드 단락 고장 특성 분석 (The Characteristics of PV module under the Partial Shading Condition and with a Failure of Bypass Diode with Short)

  • 고석환;주영철;소정훈;황혜미;정영석;강기환
    • 한국태양에너지학회 논문집
    • /
    • v.36 no.4
    • /
    • pp.41-47
    • /
    • 2016
  • A bypass diode is connected in parallel to solar cells with opposite polarity. The advantage of using the bypass diode is circumvented a destructive efforts of hot-spot heating in the photovoltaic(PV) module. In addition, it is possible to reduce a energy loss under the partial shading on the PV module. This paper presents a characteristic of photovoltaic module under partial shading condition and with defective bypass diode by using the experimental data. The results of field testing for each photovoltaic modules, when photovoltaic system which is connected power grid is operating, the inner junction-box temperature of shading photovoltaic module is high $5^{\circ}C$ because of difference of flowing current through into bypass diode. And incase of not operating photovoltaic system, the inner junction-box temperature of module with defective bypass diode is greatly higher than partial shading PV module.

전자 저울을 위한 지능형 고장 진단 시스템 (Intelligent Diagnosis System for an Electronic Weighting Machine)

  • 김종원;김영구;조현찬;서화일;김두영;이병수
    • 한국지능시스템학회논문지
    • /
    • v.11 no.9
    • /
    • pp.807-810
    • /
    • 2001
  • 본 논문은 전자 저울 시스템의 고장으로 인한 손실을 지능형 알고리즘에 의해 사전에 진단하고 예방하는 시스템을 구현하는 것을 목적으로 한다. 전자 저울에 일반적으로 사용되는 로드셀의 구성회로에 저항을 하나 삽입함으로써 필요한 정보를 획득하고 이를 분석, 추론하는 알고리즘을 구성하여 그 효용성을 밝힌다.

  • PDF