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PWM controlled optocoupler MOS with five-way polarity switching

Overview

Now I have tested 30A and it is very stable. Higher currents require fans for cooling.
There are still some problems. For example,
if the current is higher, the temperature of the PCB will rise too high. Now I have flown a 14awg wire to the top, but the temperature is still a little high (I use 10-way 50A. The latest modification has opened a window and a gnd interface has been placed on the top. It is estimated that the problem will be solved, but I have not tested the board again. It is expected that the problem will be solved. If it is not solved, opening the window will also be more conducive to flying the wire (laugh))
The main terminal under the PCB is wrongly selected. You need to modify it yourself (solved).
Choose a larger voltage divider resistor for the LED lights of the 5 relays. It was found during the test that the relay may not work. (solved) There are
no other problems. I will continue to share if there are any.
This comes from a project of mine, pwm control cooling sheet. You can search "I see ordinary eagle" on station B to learn more.

Design Files

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Update:2025-06-14 04:54:14

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