Desain dan implementasi high-current DC power supply Berbasis Penyearah Gelombang Penuh dengan reduksi ripple untuk proses elektroplating timah

Abstract

Tin electroplating process requires a direct current (DC) power supply with high current capability because the required current depends on the workpiece surface area and operating conditions. This study aims to design and implement a high-current DC power supply based on a single-phase full-wave rectifier with a capacitor filter for tin electroplating and to analyze the characteristics of its output voltage and current underload. The system uses a step-down transformer, GBPC50 bridge rectifier, 189,000 µF filter capacitor, and a 3 kΩ/1 W bleeder resistor. Experimental tests were conducted using tin electroplating loads with busbar lengths of 15–25 cm, each tested for two minutes. The measured input current was 26.7–34.0 A and input voltage was 12.6–12.9 V, while output current reached 20.6–24.5 A with output voltage of 12.0–12.2 V. The calculated output power ranged from 249.3 to 298.9 W. Oscilloscope measurements after the installation of the capacitor showed a ripple of 2.4 Vpp, corresponding to an 87.17% reduction in ripple. These results indicate that the capacitor filter effectively reduces voltage fluctuations and produces a smoother DC output, while the simple construction of the power supply is able to maintain an output voltage of approximately 12 V and deliver high current to the electroplating load.