On Jun 26, 6:23 pm, Peter Bennett <pete...@[EMAIL PROTECTED]
> wrote:
> On Thu, 26 Jun 2008 14:09:18 -0700 (PDT), lili...@[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
would there be anything else beside a relay?
that would require energy only when switching is required?
Li
|
