I have a little electronic problem that I would like to share with you all.
Well...At home I have some lead acid car batteries that I really want to charge but I haven't any good charger to do it.
Looking for a solution, I've thought in using a DC-DC step up regulator with an array of PNP or NPN transistor as current driver. At the first moment, it seems good, but I really don't know if it will work.
A friend of mine gives me a DC-DC step up regulator based on XL6009 (similitar to LM2577) and it can provide a voltage output between 5 and 35 volts (considering the input voltage: 3 to 32v) with 3A of current.
The main problem is: Can I use a 12v 15A power supply as XL6009 voltage input and some transistors as current driver to get an output of 14v 8A?
First of all, charging a lead-acid battery does not need a voltage regulator. Typical battery chargers utilize transformer-rectifier plus a 6V, 5A lamp in series to limit the current. The maximum recommended voltage from the charger is ~14 V.
Any of the above can be used; to achieve a larger output current you can add more power transistors in parallel. (2N3055).
780x series regulators need ~3V more input than output. As the output lines can be shorted, you need a fuse to prevent unprotected regulators from burnout. Exceedingly complex an unnecessary to charge a battery.
First of all, charging a lead-acid battery does not need a voltage regulator. Typical battery chargers utilize transformer-rectifier plus a 6V, 5A lamp in series to limit the current. The maximum recommended voltage from the charger is ~14 V.
Any of the above can be used; to achieve a larger output current you can add more power transistors in parallel. (2N3055).
780x series regulators need ~3V more input than output. As the output lines can be shorted, you need a fuse to prevent unprotected regulators from burnout. Exceedingly complex an unnecessary to charge a battery.
Thank you so much for having answered me too fast.
The bunch of lead acid batteries that I have need a voltage between 13.5 and 14.5v to be charged. So, I will use the XL6009 regulator to provide 14v from a 12v power supply and an array of 2 power transistors to drive more than 8A of current.
Thank you so much for having answered me too fast.
The bunch of lead acid batteries that I have need a voltage between 13.5 and 14.5v to be charged. So, I will use the XL6009 regulator to provide 14v from a 12v power supply and an array of 2 power transistors to drive more than 8A of current.
Dear Pedro,
you can do this if you like. Only please include a fuse in the output as a discharged battery can force a current surge and when connecting cables to charge batteries, shorts are common.
Regards, Jorge