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single switch reversing dc motor

single switch reversing dc motor

single switch reversing dc motor

(OP)
Hello guys,my elctronics background is only decent but not completely ignorant.I need some help with a circuit.With a single switch(spst)control I need a 12vdc low amp(automobile window lift) motor to turn on and run in one direction for 2 seconds then stop, upon closing the switch the motor needs to turn on in the opposite direction and run for 2 seconds then turn off.The motor in question has two leads, reversing leads reverses direction.ANY help would be great! Thanks so much.

RE: single switch reversing dc motor

My 1st bet would be a full-bridge (four transistors or four relays), where you control them two and two in diagonal.
(It could be done with a half-bridge if you had +/-12V, but that's not available in a car, I guess

With the motor placed across the bridge you can control on/off and direction.

Exactly what to do, when the state of the switch is changed, can then be done in digital (micro-controller ?).

RE: single switch reversing dc motor

Hi walker1,

You could do it with a DPDT reversing relay and a SPST on/off relay, saving two relays.




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RE: single switch reversing dc motor

(OP)
scotty,
 Thats the original way I built it and it works well, but I would have to install two time delys for the 2 second intervals, one for forward and one for reverse. Then I started thinking would it be better to go solid state or IC. I have no problem with the way it is, I was just wondering if there was a more effient way.

RE: single switch reversing dc motor

There are bridges available, precisely for this usage.  They are called H-bridges.  Do a search with this name and you'll find a lot of info, designs as well as parts.
The Infineon TLE5205 is an example of such a H-bridge single-chip that controls up to 5 amps.
Felix

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