Mobile Charger with Voltage Converter

Published:2013/3/22 4:00:00 Author:Ecco | Keyword: Mobile Charger , Voltage Converter | From:SeekIC

The circuit allows a simple and safe charging of 1-10 Ni-Cd or Ni-MH cells from a 12V source. The voltage converter can be operated at 6V, in this case is the max. output voltage 12V (no load). The performance can be improved through the use of Schottky diodes (D2/D3). D4 (LED) can omitted if you dont want any indicator. An astable Mutivibrator generates the oscillation frequency. At the output (pin 3) connected the voltage doubler. At C5 is idling roughly double the input voltage. Thus, sufficient voltage difference exists to charge the connected batteries.Due to the high Switching frequency can be used relatively small capacitors. The charge current is indicated by a “real” load control (D4).



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