On Thu, 26 Jun 2008 14:09:18 -0700 (PDT), lilipot@[EMAIL PROTECTED]
wrote:
>On Jun 26, 4:43 pm, mrdarr...@[EMAIL PROTECTED]
wrote:
>> On Jun 26, 1:16 pm, lili...@[EMAIL PROTECTED]
wrote:
>>
>>
>>
>> > On Jun 26, 4:10 pm, mrdarr...@[EMAIL PROTECTED]
wrote:
>>
>> > > On Jun 26, 12:20 pm, lili...@[EMAIL PROTECTED]
wrote:
>>
>> > > > Hello everybody,
>>
>> > > > I have a set of battery, but I only one hooked up to the circuit,
The
>> > > > other one act as a backup. I want to implement an electronic unit
that
>> > > > will change (swap) the batteries.Therefore the wiring will need
to be
>> > > > changed. The circuit need to sup****t 5amp of continuous current.
Here
>> > > > is what I want to implement.
>> > > > from:
>> > > > A to C
>> > > > B to D
>>
>> > > > to:
>> > > > A to D
>> > > > B to C
>>
>> > > > Is it better to use a analogue or digital switching approach. I
am
>> > > > just worried that digital might take too much energy by keeping
those
>> > > > transistor or mosfet open and close.
>>
>> > > > Li
>>
>> > > You mean something like this? (view in fixed-width font, for
example,
>> > > with Notepad)
>>
>> > > +---+ +----+ +---+
>> > > |(+)|--switch A--| |--switch C--|(+)|
>> > > | | |Load| | |
>> > > | | | | | |
>> > > |(-)|--switch B--| |--switch D--| |
>> > > +---- +----+ +---+
>>
>> > > Batt 1 Batt 2
>>
>> > Michael, This is basically what I want to do.
>> > The battery will run a very small motor and a light.
>>
>> > Li
>>
>> Looks like a double-pole-double-throw switch will work
>>
>> see http://en.wikipedia.org/wiki/Switch
>> look under DPDT
>>
>> seems simpler than a MOSFET solution.
>>
>> When exactly do you want to switch?
>>
>> Michael
>
>This was one of the initial idea, Maybe have a servo motor to control
>the switch. ( and a PIC chip to supervise the whole operation)
>K
Use a relay - that's an electrically controlled switch.
There is probably no need to switch both positive and negative
terminals - using an SPDT switch in the positive leads would likely be
sufficient.
An output of a PIC probably won't drive a 5 amp relay directly, so you
would have to have the PIC drive a transistor or small relay, which
would drive the large relay.
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
|
