powderfish
Newbie level 1
![Newbie level 1](/styles/images/ranks/alevel1.gif)
charge sla battery alternator
Hi!
I'm working on a project to use a micro to control the voltage and charge into a battery. I can output a voltage from a DAC controlled by the micro but I want to use this to alter the voltage and current supplied by a 15V DC source that can supply up to 3amps of current.
Ideally I would like to change the voltage delivered to the battery between 12 and 15V at currents up to 3 amps. It's a small scale version of intercepting a car's alternator output (in this case a bench supply) and modifying the voltage delivered to the battery controlled by the microcontroller.
The DAC is followed by an op-amp so I can amplify the micro's controlling voltage as necessary.
I have been playing with a modified version of a 2N3055 NPN transistor and LM317 circuit shown below, but i don't think I'm on the right track. For starters I have a DC input to the 2N3055 and I want to control the transistor using the DAC, not a resistor.
I would appreciate any ideas on how I can go about controlling this voltage to the battery.
Cheers,
Powderfish
Hi!
I'm working on a project to use a micro to control the voltage and charge into a battery. I can output a voltage from a DAC controlled by the micro but I want to use this to alter the voltage and current supplied by a 15V DC source that can supply up to 3amps of current.
Ideally I would like to change the voltage delivered to the battery between 12 and 15V at currents up to 3 amps. It's a small scale version of intercepting a car's alternator output (in this case a bench supply) and modifying the voltage delivered to the battery controlled by the microcontroller.
The DAC is followed by an op-amp so I can amplify the micro's controlling voltage as necessary.
I have been playing with a modified version of a 2N3055 NPN transistor and LM317 circuit shown below, but i don't think I'm on the right track. For starters I have a DC input to the 2N3055 and I want to control the transistor using the DAC, not a resistor.
I would appreciate any ideas on how I can go about controlling this voltage to the battery.
Cheers,
Powderfish
![regulator-high-current.gif](https://www.free-circuit.com/wp-content/uploads/2009/07/regulator-high-current.gif)