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fzn10 said:thanks for the reply, but my counter question is that how do they design charging circuitry based on detecting the voltage across the battery terminals if its just the voltage being applied?
fzn10 said:Thanks, that makes more sense. so in order to charge does the input voltage needs to be higher than the battery terminal voltage.
audioguru said:You do not apply a voltage to a battery to charge it. You apply a current. The battery's voltage rises when it is charging with a current.
If you applied a voltage to charge a battery then the current is completely uncontrolled.
fzn10 said:from what i gather from these replies is that if i was using a boost converter i gota control the votlage to make sure that its higher than the battery terminal voltage, and at the same time controll the current. Is that what is happening? how would i know what votlage im applying if the output voltage is just the battery terminal voltage.
fzn10 said:would this be enough to provide safe charging that would ultimtly lead to the termination of charging when the battery is full?
provide current limiting, this limit is dependent on the maximum charging current the battery can handle. use another comparitor that would gradually decrease the duty cycle of the switch as the battery voltage reaches its maximum safe voltage of 4.2V. is this good?. cause i know how to do that with a boost converter.
Would it also matter if my current is not constant, cause my input is not very stable. just as long as it does not pass the maximum charging current?
thanx
fzn10 said:well i want to use it for wind turbine and solar. So i should propably use a chip specificlly designed for charging this type of battery. i didnt want to get into it cause i wanted the least amount of circuitry but that looks like the only option. Thanks for your help.
just out of curiosity, what do u mean by "dependent on battery chemistry", do u mean dependent of different types of batteries like lithuim or Ni, or soething else, casue im gona be using the chargin circuitry for the same battery over and over again.
audioguru said:There is confusion here about whether a battery limits its own charging current. There is also confusion about voltage and current.