[EMS Discuss] HIgher current H-Bridge and circuit help

Taper Wickel EMAIL HIDDEN
Sat Apr 6 11:12:02 PDT 2013


My quick reaction is to go with relays -- and on consideration, that
original switch is probably just a DPDT wired with each "throw" inverted.

Er, reading that back, maybe this page will make things clearer:

http://www.engineersgarage.com/electronic-components/dpdt-double-pole-double-throw-relay

What you lose, compared to an H-bridge, is the capacity for speed control,
but in this application it doesn't sound vital.

Hope this helps!

Taper.

--
Taper Wickel <EMAIL HIDDEN>
Hi all!

I hope someone may be able to help me to decide what direction to take a
project that semi-works but doesn't complete the goal set out.

I have a chicken door opening mechanism built using an electronic
screwdriver powered from 4 AA batteries, it has a spool on the driver area
and it winds up a rope that pulls up the door through a pulley system. The
switch on the screwdriver is a weird type that throws both negative and
positive at once and then reverses that for the other direction, thereby
avoiding the need for any IC or control. The way we operate it is to hold
the button while the door goes up or down and release it when it is in the
correct spot. This all works fine and has been in place for a while.
However now that it gets light earlier I have built a circuit that will
automatically open the door when it gets light. It uses an H-Bridge to
control the motor instead of the direct connection to the batteries as
before, which worked great in testing with a motor with no load on it,
however once I built it all and tried to put it in place the current of the
H-Bridge(600ma) was not enough to open the door at more than a snails pace.
My question is: should I continue to look for another higher amperage (to
let all the juice from the batteries through would be a much higher
amperage, like 1 amp)H-Bridge with a similar pinout layout or try to use
relays to switch it, or try to use some transistors to do it?

Thanks for any help!

Cord

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