<![CDATA[ A comprehensive understanding of the operational characteristics of DC-DC boost converters and the fundamental differences between open-loop and closed-loop control systems are crucial learning outcomes in the power electronics curriculum. However, limited laboratory equipment often makes it difficult for students to observe physical phenomena such as voltage drop due to load regulation. This research aims to design and implement a Dual-Mode DC-DC Boost Converter learning module based on an Arduino Nano microcontroller that is compact, accurate, and integrated into a portable suitcase chassis. The power circuit is built using logic-level IRLZ44N MOSFETs, SR3150 Schottky diodes (150 V/3 A), a 330 μH toroidal inductor, and a 47 μF/160 V filter capacitor, operating at a PWM switching frequency of 62.5 kHz. The control circuit is self-powered by a 5 V DC cell phone charger via the Arduino Nano’s USB port. The system incorporates an SPDT toggle switch for instant mode switching between manual open-loop operation and automatic closed-loop PID operation (K_p = 0.2; K_i = 0.4; K_d = 0.0) to lock the target output voltage (12 V–50 V DC) from a variable power supply input (3 V–24 V DC). Experimental testing was conducted under four load conditions (no load, 220 kΩ, 22 kΩ, and 1 kΩ) with transient data recorded at 10 ms intervals, totaling 1,500 samples. The test results show that the voltage divider feedback circuit (K=101) has a high level of accuracy with an average error percentage of 0.88%. Evaluation of the transient response yielded a Mean Square Error (MSE) value of 33.82 under no-load conditions; 35.95 at a 220 kΩ load; 36.10 at a 22 kΩ load; and 46.80 at the heaviest load of 1 kΩ. The PID controller proved highly reliable in compensating for current draw up to 55.0 mA without experiencing steady-state error, making this module highly suitable for use as an interactive laboratory exercise.]]>
