Rancang Bangun Pengisian Tegangan Baterai Handphone (HP) Metoda Buck Konverter DC-DC Tipe FC75

Abstract

Mobile phone (HP) battery manufacturing specifications have a charging current capacity maximum parameter C_Ah(maks.) = 800 mAh and maximum voltage Vbat_(max.) = 3.7 volts dc reduces to 2.02 volts dc requires recharging. In this research HP battery voltage was recharged using the FC75 dc-dc buck converter method, starting from a voltage of Vbat_(initial) = 2.02 volts until the final battery voltage was charged at Vbat_(final) = 3.713 volts. The HP battery charge voltage parameter Vch comes from the output voltage of the FC75 dc-dc buck converter the parameter Vo_(conv.) is expressed as Vo_(conv.) = Vch. The purpose of using the FC75 dc-dc buck converter is to electronically convert the lower Vo_(conv.) charger voltage (buck) to the larger Vi_(conv.) input voltage to control the HP battery charger output power equal to the input power. The results of the research on controlling the output power of the HP battery charger of Po_(conv.) = Pi_(conv.) = 0.579 watts, there was an increase in the final charger voltage Vo_konv.(final) along with the increase in the final HP battery voltage Vbat(final) being charged. The increase in the final charger voltage reaches Vo_konv.(final) = Vbat_(final) = 3.713 volts, the final charger current becomes Ich_(final) = 0.156 A and remains towards the HP battery during charging with a difference in the decrease in charger current towards the HP battery of ∆Ich = 0.009 A relatively small is still profitable, because it avoids back current to the charger voltage.