Re: How to get steady 6V DC from battery?
- From: Rich Grise <richgrise@xxxxxxxxxxx>
- Date: Wed, 13 Jul 2005 22:20:54 GMT
On Wed, 13 Jul 2005 14:28:36 -0700, Bob Eldred wrote:
>
> "Michael Noone" <mnoone.uiuc.edu@xxxxxxxxx> wrote in message
> news:Xns9691A3700A70mnooneuiucedu127001@xxxxxxxxxxxxxxxxx
>> Hi - I'm working on a fairly large battery powered servo controller. To
>> power these servos I would like to get a steady 6V from the battery supply
>> - Ideally I'd like it to be able to handle battery voltages between about
> 5
>> and 20VDC, but if that's not possible (as that would be both step up and
>> step down - which I expect makes things tricky). It needs to be able to
>> source about 10A peak, though in reality I don't expect it to often go
>> above 1A.
>>
>> How hard would something like this be to make? I must admit that I've
> never
>> done any work with stepping up a DC voltage before, nor have I done
>> anything with stepping down a DC voltage efficiently. Or are there any
> pre-
>> made products that can do this? I've seen chips with very similar specs to
>> what I need - except that they outputted 5V, or 3.3V, or some other more
>> standard voltage.
>>
>> Any ideas? Thanks!
>>
>> -Michael J. Noone
>
> It sounds like you need a 60watt DC to DC converter which you can make or
> buy ready to go. It's not particularly difficult to do this in a buck-boost
> device but like any thing else there are are many design considerations to
> get in the way of your original goal. Unless you want to become an expert on
> converters, I'd just buy one.
>
> Another idea is to ask why do you want to control the voltage this way? In a
> servo, the motor(s) are already driven by amplifiers or PWM drivers. The
> rail voltage is, in reality, just a gain coefficient in the servo design. If
> that needs to be adjusted for stability or other reasons, do it at signal
> levels before the driver circuitry and don't screw around with additional
> power managment before the servo(s). Your just loosing efficiency to
> regulate power twice; once in the converter and again in the servo. If it
> were me, I'd think about the overall design, not just how do I get six
> volts.
I was going to say much the same thing, except I would have said something
like, "Just use separate batteries for the motors and electronics, and
control the motor current, so you don't have to bother with what the
voltage is."
And, why such a wide range of voltages? Don't you get to tell your
production department which battery to use? ;-)
Good Luck!
Rich
.
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