| Electronics > Beginners |
| 12vdc motor fwd/rev with photo transistor |
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| xvr:
--- Quote ---In this version I added 2 MOSFETs to handle Ground. Will that work? --- End quote --- No. You have to provide control voltage to Gates of upper MOSFETS relative to these Sources, which now connected to motor, not to Ground. You need control circuits for so called HiSide MOSFET connection. |
| techninja80:
If you need to keep it discreet components, then this seems to be a good schematic. It seems to be what you are trying to do. https://www.precisionmicrodrives.com/discrete-h-bridge-circuit-enhanced-vibration-motor-control |
| YankeePirate:
Thank you. The H Bridge article suggests the entire circuit also exists in a single package. What is confusing is A A' B B' ?where is input/output. Will try tracing performance. |
| techninja80:
You need to address all four pins as inputs. From what I remember there was a truth table to it. But to simpify it. I think it was A=on A' = off (motor spins clockwise) B=off B' = ON (motor spins clockwise) A=off A' = on (motor spins anticlockwise) B=on B'=off (motor spins antniclockwise) B=on B'=on (motor breaks applied) A=on A'=on (motor breaks applied) The M in the middle is the motor (output), it will have two leads. You will connect the two of them as the schematic shows. It does not matter what way it goes the hbridge will control direction. The capacitor at the bottom is for noise cancellation, that just connects from on side of the motor to the other. Don't take my word for it. I am just going from memory. But yeah all four need addressing most use some type of IC like Arduino. Or you can just get the H-bridge IC like a L9110H and just use that. You most likely will need heat sync's on all four Transistors if you build it yourself for any real amps. So best to get the IC, and do one heat sink. |
| YankeePirate:
Found these for $13 for 50A and $6 for 3.6A This just leaves the trigger signal coming from phototransistors/light detector |
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