Dear fellow forumers,
I have to admit that I have this issue with my H-bridge motor controller and after google search for hints or solutions, I had found this site. Bookmarked and had browsed through for a while and I find it good. So, I hope you goodfellows could help me.
I had this low-cost electric wheelchair project. Since it has to be low cost to benefit the users, I have to resort to design it's controller from basic easy to get components. You see, here in Malaysia, it's not easy to get parts, especially ICs. Previous design of mine had failed (I'm a Mechie by training), it utilizes some hard to get ICs in which I had to resort to Farnell. Anyway, I end up searching and designing this version that utilizes discrete components and only an op-amp. I had it prototyped using a stripboard. It worked for a while and later when I checked, my high side forward P-MOSFET had died. Previous version had these MOSFETs blown with loud pop but this time, it was a silent death.
Just some basic info, I combined 2 lead-acid battery to have 24VDC, runs a 14.4VDC cordless drill motor which I'm guessing the max current would be less than 7A. I have a BasicX B-24 microcontroller to control this motor speed controller. Signals are 5V digital. 4 signals from the microcontroller, to control each forward reverse hi lo MOSFETs.
Therefore, I am hoping to get any suggestions, help or critiques from you guys. I had scratched my head (I think I'm balding) but still can't figured it out. Thanks in advance.
Regards.
I have to admit that I have this issue with my H-bridge motor controller and after google search for hints or solutions, I had found this site. Bookmarked and had browsed through for a while and I find it good. So, I hope you goodfellows could help me.
I had this low-cost electric wheelchair project. Since it has to be low cost to benefit the users, I have to resort to design it's controller from basic easy to get components. You see, here in Malaysia, it's not easy to get parts, especially ICs. Previous design of mine had failed (I'm a Mechie by training), it utilizes some hard to get ICs in which I had to resort to Farnell. Anyway, I end up searching and designing this version that utilizes discrete components and only an op-amp. I had it prototyped using a stripboard. It worked for a while and later when I checked, my high side forward P-MOSFET had died. Previous version had these MOSFETs blown with loud pop but this time, it was a silent death.
Just some basic info, I combined 2 lead-acid battery to have 24VDC, runs a 14.4VDC cordless drill motor which I'm guessing the max current would be less than 7A. I have a BasicX B-24 microcontroller to control this motor speed controller. Signals are 5V digital. 4 signals from the microcontroller, to control each forward reverse hi lo MOSFETs.
Therefore, I am hoping to get any suggestions, help or critiques from you guys. I had scratched my head (I think I'm balding) but still can't figured it out. Thanks in advance.
Regards.