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Open AccessArticle

Implementation and Experimental Verification of Smart Junction Box for Low-Voltage Automotive Electronics in Electric Vehicles

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Department of Mechanical Design Engineering, Wonkwang University, 460 Iksan-daero, Iksan-si, Jeollabuk-do 54538, Korea
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Department of Automotive Engineering, Honam University, 417 Eodeung-daero, Gwangsan-gu, Gwangju 62399, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(7), 2214; https://doi.org/10.3390/app10072214
Received: 8 March 2020 / Accepted: 19 March 2020 / Published: 25 March 2020
(This article belongs to the Section Electrical, Electronics and Communications Engineering)
In this study, we designed and implemented a smart junction box (SJB) that was optimized for supplying power to low-voltage headlights (13.5 V) in electric vehicles. The design incorporated a number of automotive semiconductor devices, and components were placed in a high-density arrangement to reduce the overall size of the final design. The heat generated by the SJB was efficiently managed to mount an Intelligent Power Switch (IPS), which was used to power the headlights onto the printed circuit board (PCB) to minimize the impact on other components. The SJB was designed to provide power to the headlights via pulse width modulation to extend their lifetime. In addition, overload protection and fail/safe functions were implemented in the software to improve the stability of the system, and a controller area network (CAN) bus was provided for communications with various components in the SJB as well as with external controllers. The performance of the SJB was validated via a load operation test to assess the short circuit and overload protection functions, and the output duty cycle was evaluated across a range of input voltages to ensure proper operation. Based on our results, the power supplied to the headlights was found to be uniform and stable.
Keywords: electric vehicle; smart junction box; intelligent power switch; diagnostic system; automotive electronics electric vehicle; smart junction box; intelligent power switch; diagnostic system; automotive electronics
MDPI and ACS Style

Lee, S.W.; Baek, S.-W. Implementation and Experimental Verification of Smart Junction Box for Low-Voltage Automotive Electronics in Electric Vehicles. Appl. Sci. 2020, 10, 2214.

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