Sponsored by JLCPCB ($2 for 10 Boards): https://jlcpcb.com
I designed a new PCB for the DCOI (Dual Complementary Opto-Isolator) MOSFET Driver and JLCPCB made it for me. It replaces the Veroboard version. Has some nice features including a 12V A23 battery holder.
I designed a new PCB for the DCOI (Dual Complementary Opto-Isolator) MOSFET Driver and JLCPCB made it for me. It replaces the Veroboard version. Has some nice features including a 12V A23 battery holder.
wow, nice PCB nice job, I have 8 switches in two full-bridge and need a gate driver for it, how to use this driver for my model? is it possible to use it?
Uh, why's your Arduino Nano labeled "Uno"?
Why no mounting holes for those boards? This is one of my gripes when it comes to little modules I've been getting from China…
Careful using that stepup module. The datasheet says output voltage can double when unloaded. That can blow some MOSFETs. It says minimum load is 10%.
You have still got the problem that the opto couplers alone are way to slow to drive a MOSFET as a switch. Not only that, they have different turn on and turn off times so you end up with the situation that they could either be both on (damaging the OCs) or off at which point the gate of the MOSFET is at a somewhat but not fully open voltage creating a lot of heat in the MOSFET.
I don't know exactly what opto couplers you are using, but they are usually a few tens of mA max at the output. What makes it even worse is that optocouplers have something called "current transfer ratio". That value is usually less than 1, meaning that for every mA you drive the LED at the output transistor will let through less than a mA (50% is a typical value). Take the 10 or 20 mA the Arduino is driving the LED at, and you end up with 5-10mA at the output transistor. That is way too little for driving a power MOSFET in PWM.
Get rid of the second optocoupler (there's absolutely no need for it, just adds problems) and add a simple push-pulls stage at the output.
Any reason you dont get them to panelise the boards? The $2 boards go up to 100mm x 100mm, and you could easily fit 8 boards in. So you'd get 80 instead of only 10!
Just to interrupt your video, but I want to ask how you like you Owon scope? I have been using a Hantek PC scope and it's sorta OK. For £50 how can I complain? But my "workshop" lol is tiny. I have been looking at the errr 5102p (Maybe?) jonstephensonsblog dot com.
Very cool !
Is there anyway I could purchase two of the pcbs. Very nice mosfet package. Please let me know.
Why was that battery packet labelled LR44 as well as A23? I realize the 12v battery may be made up of a stack of button cells, but are they really suggesting you cut up the 12v battery if you want LR44s instead?
RESISTORE ? Do you watch AvE ?:D
Great work, great video, warts and all. Great commentary Julian 👍🏴