ANALISIS DAN SIMULASI PENGENDALIAN SISTEM LAMPU KENDARAAN MENGGUNAKAN MOSFET DAN OPTOCOUPLER PC817 SECARA DIGITAL

Abstract

Analog vehicle lamp control has limitations in switching speed and power loss. This study aims to analyze and simulate the control of a 12V vehicle lighting system consisting of headlamp, turn signal, hazard, brake, horn, and cabin lamps using MOSFET and PC817 optocoupler as a digital switch. The method used is a simulation using Livewire Professional by varying the LED forward current (If) 5 mA – 15 mA and measuring Vce voltage, rise time, fall time, and Rds(on) of the MOSFET. The simulation results show that the common emitter configuration with a 1K pull-up to 12V is able to produce a switching working voltage of 11.8 V with a rise time of 3.2 µs, thus being able to optimally activate the 12V lamp with 98% lower power loss compared to an analog switch. This system also provides optical isolation between the 5V control circuit and the 12V load.