Universal Charger

The main PCB for the charger is a single sided, 1.6mm tick printed circuit board. The DC/DC converter is now integrated within the charger in order to allow the charge of high number cell packs. The people that charges only few batteries (12Vdc supplies sufficient) can not mount the components for the DC/DC converter saving the money of this part. The DC/DC converter part is a generic step-up converter, capable to deliver 7.5A and an output voltage of 24Vdc, starting from a 12Vdc supply. The main parts are the following:

  • PWM controller UC3843 very cheap and easy to find
  • Power inductor from Bourns, type 2306RC (27uH, 15A), Farnell 1167731
  • The power diode is a schottky type,and a N-type mosfet can be generic: all the two components are in case TO-220

Universal Charger: [Link]