i am charging lead acid battery using full bridge topology, when i check the output current with resistive load (8A) the waveform is good i.e it is in continues and having ripple current of 2A pk-pk.
next i connected the battery, the current waveform is good upto 3 amps, beyond 3 amps the output current is going to pk pk 16A. the waveform is not good it is going to 1amp to 16 amp.
i did not understand why the system is behaing like this.
The battery is like a huge capacitor. Your charger is not able to supply the required current. Hence the huge ripple. Try putting some large capacitors across the charger.
The battery is like a huge capacitor. Your charger is not able to supply the required current. Hence the huge ripple. Try putting some large capacitors across the charger.
Check the ripple on an oscilloscope and not with a multimeter. Increase it if necessary. Instead of using 1 large value like 10,000 uF, use small values in parallel. This will further reduce the ESR (Effective Series Resistance) of the capacitors.
Check the ripple on an oscilloscope and not with a multimeter. Increase it if necessary. Instead of using 1 large value like 10,000 uF, use small values in parallel. This will further reduce the ESR (Effective Series Resistance) of the capacitors.
The waveform is from a current probe. What is the voltage ripple? If it is 1 or 2 volts / current, it should be ok I presume. To make it smooth, you will need lots of capacitors and it will cost a lot.
as per my design i need to get dc output current with pk-pk of 2A, but here i am not getting dc, getting ripple dc from 1 A to 16A, this is not desirable.
if we charge the battry like this the battery life effects.....
If you are talking of pk-pk, then it is AC, what is the DC component on the output?
If you are in Bangalore, you can call me. I need to have more info about the problems you are having.
what i understand is that to charge battery first u ned a DC voltage,
what is charging current for battery?
If it is <1.5A then use a LM317 and configure it as current source then u r current thru battery will be constant.