The evolution of my electric kayak anchor continues. For now I'm working on improving the motor driver circuit. First iteration is a circuit from an old youtube video I came across. I have gone from the h bridge implemented with just wires, switches, and diodes to an actual mosfet circuit on perfboard. I'll do a full writeup once I reach the end of the project but for now suffice to say I have a completely working setup and the kayak is back on the water. Here is my next iteration for your critique. I built the circuit on breadboard and now I've mocked it up on DIY Layout Creator. All N channel mosfets. 12v permanent magnet motor that is labeled 6-8 amps. No flyback diodes implemented yet on the stripboard layout. I see several resources saying that they are not needed because the body diodes in the mosfets act in the same capacity. Opinions?



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Any glaring mistakes in the design or implementation?

 

Where is the gate bias voltage for the M1-M3 coming from,?
https://tahmidmc.blogspot.com/2013/01/using-high-low-side-driver-ir2110-with.html

 

Where is the gate bias voltage for the M1-M3 coming from,?
https://tahmidmc.blogspot.com/2013/01/using-high-low-side-driver-ir2110-with.html

I read the page you linked but I have to admit it went a little over my head. I'll go over it a few more times to see if I take your point.

Are you saying there is no voltage at the gates of M1 and M3 and so they wont allow current flow from drain to source? My understanding is that the gates are brought up to 12v through switches J1 and J2 (not at the same time of course). The traces are connected just above R4 and R1, which both then connect to those gates. Activating switch J1 brings gates on M1 and M4 to 12v, allowing current to flow through M1, through the motor, and then through M4. The opposite direction utilizes J2, M2, M3. Is there a flaw in my understanding?

The diagram is from a 12 year old youtube video so its not real clear. Sorry about that.