Thread: Discussion H-bridge motor controller
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Old Mar 26, 2012, 07:59 PM
mjsas is offline
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Your circuit has a defect and the boot straps do not work correct. To run the motor Q1 and Q4 have to be on or pulsed and Q2 and Q3 totally off. In this case the boot strap for IC1 does not work as Q2 is not pulsing so Q1 will not turn on.

A solution would be to replace the boot strap circuits with a 9 volt DC power supply connected to the boot pins of the IC1 and IC2 modules and the 24 volt power supply. This would be 33 volts at the boot pins. A 9 volt supply is just a 9 volt battery.

And another point is to connect a small capacitor across the motor to reduce the noise from the brushes. Without the cap the FETs will go boom.
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