Relay vs H-bridge question
June 8, 2013
most of the time I use an L298D motor driver IC for controling motors. However i find that the 1+ voltage drop is anoying. Some motors just dont go fast enough.
Using a 7.2V power supply, leaves about 6V going to the motors and, as I understand it, the L298D is not designed to take in higher voltages. Although I think it can handle quite a bit if you cool it properly.
One option would be to use a mosfet to provide the current, as shown in the picaxe manual example circuits. Another pin can then control a relay to reverse the polarity to the motor. The idea is to use the full voltage of the batteries to the motors. I've tried to sketch the circuit here with 9.6V, but 12V could be an option too.
Can anyone tell me whether this will work OK and what the pitfalls and downsides are?