• Title, Summary, Keyword: junction box

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

  • Lee, Young-Lim
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.2
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    • pp.136-142
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    • 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
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    • v.17 no.6
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    • pp.359-362
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    • 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
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    • v.17 no.1
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    • pp.21-24
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    • 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.

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

  • Park, Byung-Joon;Hahn, Kwang-Soo;Lee, Ho-Jun
    • Journal of Korea Multimedia Society
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    • v.13 no.3
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    • pp.392-399
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    • 2010
  • The Automobile has developed and changed through the years from the invention and increased human-being's scope of activity. Junction Box, one of the part of automobile, is inspected by human eyes which caused mistakes and slow progress. To achieve the speed and accuracy the system was compensated by vision system which is inspecting automatically. This paper is automatic inspection of fuse and relay which is inserted in the junction box by checking the color and pattern of the cover. After checking the performance of the system by using the junction box, the result was 100 percent perception and open the possibility to inspect junction box fast and easy and accurate if it is applied to the industry.

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

  • Jeong, Min-Soo;Kim, Mun-Gyeom;Park, Young-Hoan;Bang, Soon-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.2
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    • pp.276-285
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    • 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
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    • v.4 no.3
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    • pp.302-312
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    • 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.

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

  • 이승엽;김경재;이영훈;허선종;박한규
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.18 no.11
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    • pp.1669-1676
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    • 1993
  • In this paper, a thin-straight monopole antenna attached to a conducting box is analyzed using a moment method with the pocklington integral expression for the exact Green's function. A modeling of a conducting box is based on a Wire-Grid method for an efficient calculation procedure. A system of linear equation is obtained using the piecewise sinusoidal basis function. And a Junction basis function is enforcing to represent the physical current on the edge of the conducting box. Especially, the junction basis functions are overlapped for the current continuity preserving on the vertexes. Numerical results are obtained for the current distribution on the unified antenna/conducting box system, input impedance and radiation pattern. The results are compared with the known data.

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

  • Lee, Ukjun;Kwon, Geono;Lim, Hansang;Shin, Hyunchol
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.3
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    • pp.82-88
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    • 2015
  • This paper presents a design of the enable switch circuit, which is consist of discrete device at smart junction box(SJB) board. The Enable switch circuit, which receives ignition signal (IG) for input, sends a drive signal to linear regulator and other elements. The circuit design is carried out in a BCDMOS $0.18{\mu}m$ technology, and the performances are verified through simulations according to AEC-Q100 and ISO 7637-2. Die area of the designed Enable switch circuit is $1.67mm{\times}0.54mm$ in layout, and it is shown that the die can be housed in $3mm{\times}3mm$ HVSON8 package. The designed enable switch circuit is expected to be widely adopted in various automotive SJB's since it can significantly reduce the overall printed circuit board form factor.

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

  • Ko, Suk-Whan;Ju, Young-Chul;So, Jung-Hun;Hwang, Hye-Mi;Jung, Young-Seok;Kang, Gi-Hwan
    • Journal of the Korean Solar Energy Society
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    • v.36 no.4
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    • pp.41-47
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    • 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.

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

  • 김종원;김영구;조현찬;서화일;김두영;이병수
    • Journal of Korean Institute of Intelligent Systems
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    • v.11 no.9
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    • pp.807-810
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    • 2001
  • Election Weighting Machine is used an electronic scale which has many trouble because of broken load cells. In this paper, we propose an Intelligent Diagnosis System will for an electronic weighting machine using fuzzy logic. It s purpose be detect of the load cell s trouble. The electronic circuit of system, which call junction box , will be connected resistance in a series at circuit of Wheatstone Bridge for monitoring the condition of load cells.

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