[OpenTRV-dev] OT: Charge battery

[Bo Herrmannsen]

yeah... let me eyeball it a bit...

schematic for it: 
http://cdn.instructables.com/F4D/99BK/HUVPR4J5/F4D99BKHUVPR4J5.MEDIUM.jpg

it has a load connection at the right.. but i guess that is an optional one 
in my case ?



-----Oprindelig meddelelse----- 
From: Stuart Poulton
Sent: Thursday, May 15, 2014 2:46 PM
To: Closed list for developer discussions
Subject: Re: [OpenTRV-dev] OT: Charge battery

Bo,

Can you get some ideas from this

http://blog.arduino.cc/2014/05/07/a-solar-charge-controller-made-with-arduino/

Stuart


On 15/05/14 12:32, Bo Herrmannsen wrote:
> 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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