This is a simple charger
for nickel-cadmium battery (NiCd) that can be connected in your USB port. The
charging scheme employs only a constant current charging. The two NiCd cells
are connected in series and charge at 200mA current. Charging current is
controlled by zener diode D1 and resistor R1. You can increase
or decrease the current by using the approximate equation:
Current = VD1/R1; where VD1 is the zener voltage.
The use of D2 is to limit the voltage across the battery, thus protect it from damage. Charging time of the fully discharged battery is given by the formula:
Time = Battery rating / 200mA ; where Battery rating is in mAH.
Example: battery rating 220mAh;
Time = 2200mAH / 200mA = 11 hours; meaning do not let battery charged more than 11 hours.
Current = VD1/R1; where VD1 is the zener voltage.
The use of D2 is to limit the voltage across the battery, thus protect it from damage. Charging time of the fully discharged battery is given by the formula:
Time = Battery rating / 200mA ; where Battery rating is in mAH.
Example: battery rating 220mAh;
Time = 2200mAH / 200mA = 11 hours; meaning do not let battery charged more than 11 hours.
यदि आपको मोबाईल के बारे मे कुछ भी पुछना हो तो लिखे
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