H bridge

[Armadus]

Thanks to all for your respoonse.

As Skimask indicated I found more hits on Google and I could not possiblity look at them all.
My posting was not to save time, but hopefully get some real world application feedback on practical circuits. Unfortunately I have not always found that everything on a Google search is credible.

In regards to the posting by mister_e I am experiementing with a mosfet circuit. I am using a simple NPN and PNP transistor as a driver off the PIC.

The posting by sayzer is interesting, but in the future I may want to add speed control which I do not see as possible with the relay.

If anyone has any comments on the pros and cons and reliabiltiy of the multitude of mosfets available for this application it would be appreciated.

[sayzer]

Wo wo wo,

It is possible to have speed control with relay, as I mostly do.

The Relay is for the direction, not for the speed.

IRFZ44 is for speed control.


When the relay is OFF, your motor terminals are connected with one direction, say CW.
When the relay is ON, your motor terminals are connected with the other direction, CCW.

In both cases, motor is not running.
You can turn the motor ON, OFF or control its speed via IRFZ44.

<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2517&d=1208532602">

[Armadus]

Thanks for the new information. I think that this is a superior circuit compared to the mosfet bridge using 4 transistors to trigger the four mosfets. This circuit has the elegance of simplicity, which I think will also be more reliable. Just the info I am looking for.