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diode have same voltage same side

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raksha singh

raksha singh

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hello



when diode ' s both side have same voltage 12v.
e.g. 12 v 1amp adapter in one side ,then its positive leg with 1n4007 diode(forward direction ) connecting to 12 v 7 ah lead acid smf battery 's positive terminal and negative terminal of both are common .
adapter will charge battery till battery get its full 12 v then after getting full charge diode's both side have same voltage 12 v
then in that condition does adapter will give current to battey always or will stop current to charge battey ?



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A silicon diode will drop about 0.7V, so the 12V from your adapter is not 12V, but 11.3V, depending on current draw.

Not enough to charge your battery, as stated previously in another topic.

A diode will only conduct if the anode is more positive (again, aprox 0.7V) then the cathode.

So if you take care your adapter puts out 13.8+0.7V=14.5V, the battery will charge. As it becomes charged it will draw less and less current, but I guess it won't fall to zero.

Any voltage higher then the present float voltage of the battery will cause a charging current to flow. The higher the voltage, the more current will flow, depending on state of charge. For a 12V lead-acid battery, the absolute maximum charging voltage is 14.4V or so.
 

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