| Summary: | Traditional mosquito repellent methods, such as chemical sprays and vaporizers, often pose health and environmental risks. In response, yellow light-emitting diodes (LEDs) in the 570–590 nm range have emerged as promising, non-chemical alternatives. However, their effectiveness is highly dependent on consistent current supply, which standard low-cost LED drivers fail to ensure under varying conditions. This study presents the design and simulation of a constant current LED driver circuit using a DC-DC buck converter integrated with peak current mode control (PCMC). The system was developed to provide a stable output of 0.315 A at 24 V to drive a string of 10 yellow LEDs. Component sizing and control implementation—including the use of comparators, SR flip-flops, and a PWM generator—were carefully optimized to ensure operation in continuous conduction mode. Simulation results, conducted in MATLAB/Simulink, confirmed the driver’s ability to maintain low ripple, accurate current tracking, and regulated voltage output of approximately 23.8 V. The proposed driver demonstrated stable performance suitable for mosquito-repelling applications, achieving enhanced LED lifespan, brightness consistency, and switching stability.
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