[OpenTRV-dev] OT: Charge battery

[Bo Herrmannsen]

i wonde if a charger for ohbby RC would not be cheaper in the end...

one like this: http://www.maxam.dk/chargers/m0105.asp



-----Oprindelig meddelelse----- 
From: Stuart Poulton
Sent: Thursday, May 15, 2014 12:07 PM
To: Closed list for developer discussions
Subject: Re: [OpenTRV-dev] OT: Charge battery

Take a look at the following URL's all you're doing is building a
glorified lab power supply

https://www.google.co.uk/search?q=arduino+power+supply#q=arduino+controlled+power+supply

Cheers

Stuart


> oki
>
> but how do we control voltage vs current is say  we use an n-channel 
> mostfet on a PWM pin?
>
> i got it on how to messure the 2 things
>
>
> -----Oprindelig meddelelse----- From: Kevin Wood
> Sent: Thursday, May 15, 2014 11:49 AM
> To: Closed list for developer discussions
> Subject: Re: [OpenTRV-dev] OT: Charge battery
>
>> are the reason for the buck converter that it can adjust the voltage 
>> above
>> the input voltage from the PSU ?
>
> No, although you could use a boost converter instead to achieve that. I
> suspect the prime reason for using a switching converter is efficiency and
> to reduce size and heat dissipation. I think the ap note was aimed at
> small battery powered appliances using AVRs.
>
> If you're not so worried about efficiency, you could make the pass element
> a simpler linear device, but still control it using a voltage derived from
> one of the AVR PWM channels. You could do something similar to make an
> active load for testing the batteries.
>
> Best Regards
>
> Kevin
>
>
>
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