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I want to make a variable battergy charger that can charge batterof any ranges from 3 to 12 vollts? Answered

Tags:Charger

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iceng

5 years ago

Easy use a regular power supply that has both a voltage set feature and a current limit feature..

Set the voltage and current recommended for the battery to be charged.

Apply the power and watch the battery temperature does not exceed 50C..

Some batteries need a full discharge cycle first.

Some batteries need the charging voltage to change during charging.

A

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icengiceng

Answer 5 years ago

ermm.... I said

"watch the battery temperature" meansdon't let the battery get hot

IT MAY EXPLODE & START A FIRE !!!

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seandogue

5 years ago

What kind of battery?

taking an easy example, If you use lead-acid, you could do so in a basic form with a variable (ie programmable/adjustable current) constant-current supply. (Constant-current supplies are in general ideal for bulk-charging lead acid batteries, and for the why behind that, well, do some googling... try hawker batteries for a good treatment of the ideas. they have a really nice bit of serious but readable tech info that is afaik still freely available) Constant-current sources would be good because in that case, if designed correctly, the battery voltage would be of no consequence, since the constant current source will adjust its voltage to suit the need.

Now obviously, I've left out certain things like conditioning paradigms (a deeply, discharged battery, left alone, will grow highly resistive (ie resistor) lead sulfate crystals that effectively end the battery's life by restricting current transport through the electrodes, but can under certain circumstance be reincorporated into the electrolyte if caught early and charged using "tricks" like ~high v pulse, introducing a continuous ac wave into the DC drive, etc - some of the magic is sketchy, some I've used myself and just refreshed a pair of free, "dead and sitting in a closet for months" $40 UPS batteries to about 99.8% of their rated specs last summer that I'm now using to power my telescope when in-field. Still working like champs and will as long as I keep them charged, maintaining their lives by doing so), followup and maintenance trickle-charging, etc, but the guts is right there, as long as it's range of operating voltages fits the requirement. That's for you to find in the catalogs or to design and build yourself.....

The other battery types require different methods to conform to electrical and safety requirements and most often won't be suited to a simple constant current source, even for bulk charging and some, additionally require temperate monitoring.

Good luck

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seandogueseandogue

Answer 5 years ago

erm... last sentence...

"temperate" => "termperature"