[OpenTRV-dev] OT: Charge battery

[Bo Herrmannsen]

found that the on times on the buck converter decides the voltage....

but i guess a PWM signal from the AVR itself can do the same?



-----Oprindelig meddelelse----- 
From: Bo Herrmannsen
Sent: Thursday, May 15, 2014 12:20 AM
To: Closed list for developer discussions
Subject: Re: [OpenTRV-dev] OT: Charge battery

hmm... buck converter part...

i can see a fet is used there, but cant figure if it's used to regulate volt
or current... its those spec parts i need... something simple to regulate
voltage and something to regulate the current...



-----Oprindelig meddelelse----- 
From: Kevin Wood
Sent: Wednesday, May 14, 2014 11:20 PM
To: Closed list for developer discussions
Subject: Re: [OpenTRV-dev] OT: Charge battery


There's an AVR app note that might be interesting:

http://www.gaw.ru/pdf/Atmel/app/avr/AVR450.pdf

Best Regards

Kevin

On 14/05/14 21:17, Bo Herrmannsen wrote:
> could voltage be done with a n-channel mosfet and the pwm output pins?
> if so what abour controlling the current?
> *From:* Bo Herrmannsen <mailto:EMAIL ADDRESS HIDDEN>
> *Sent:* Wednesday, May 14, 2014 9:55 PM
> *To:* Closed list for developer discussions
> <mailto:EMAIL ADDRESS HIDDEN>
> *Subject:* OT: Charge battery
> Hi
> i have a few LCD’s and some other bits arround i want to put together to
> make an charger / discharger controlled by and arduino
> dis charging is easy enough.... and the math to do it also
> but how about charging... i would like to both be able to regulate
> voltage and current... depending on what type of battery i have 
> connected...
> i plan to have the supply voltage at 18-20V to cover most needs... if
> not i rip that old 18amp car battery charger and use the trafo in that
> one...
> anyways what is the simple way to control voltage ? and how would i do
> current ?
> /Bo
>
>
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