h bridge driver circuit


Posted on Feb 7, 2014

The so-called regenerative effect of a 4-quadrant inverter. Yup you will need to dissipate that power somewhere. In big industrial drives this gets re-inverted onto the national grib, but hear I would suggest a braking cct. For low-power stuff (1W-5W) they are ok, but for more power, the mis-match in switching times starts to become a major hindra


h bridge driver circuit
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nce in ensuring no switching shoot-throughs. My only concern with this design is to do with your operating voltage. This H-bridge has been setup to run at 12V, as a result they can use the cheaky pull-up resistors to turn on/off the upper FET`s You are going to have to have an isolated Gate-drive for (at least) the upper two FET`s, giving them a floatingh supply to allow the gate-source to be switched local to this isolated supply. Whith working at a higher voltage the speed at which you turn the FET`s on is going to become more important. The problem with this 12V design is it uses a 10k to turn OFF/ON which is bloody slow. You are going to want to turn these FET`s on alot faster so a gate resistor in the order of 100R is needed (but check datasheets) Hmmm. guess this is going to be more difficult than I thought. The motors are rated for 42 volts, but I dont have to run them at that voltage, I think I`ll just give 12V a try and see if it is sufficient. As long as it can handle the current (roughly 5-6 amps when stalled at 12V) I should be ok. Hmmm. guess this is going to be more difficult than I thought. The motors are rated for 42 volts, but I dont have to run them at that voltage, I think I`ll just give 12V a try and see if it is sufficient. As long as it can handle the current (roughly 5-6 amps when stalled at 12V) I should be ok. I`m trying to make a simple CNC router/plotter. The motor is originally off of a 1...




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