MOSFETs IN SERIES


Posted on Feb 6, 2014

A while ago i run across this document which apparently tells how to wire mosfets in series to get higher voltages (pg 10-14). This is the only schematic i found so far that is actually working. The problem is that i can`t make more than 3 mosfets work, when i add a fourth ( with the same circuitry) it remains OFF no matter what. I tried different


MOSFETs IN SERIES
Click here to download the full size of the above Circuit.

resistor values. At first i though that if R2 has 2ohms and R3 20ohms that the next should be 200ohms. When it didn`t work i tried 20, 50 and 1k but with no luck. Can you please tell me what i did wrong You need to post your circuit and indicate voltages used, I would suggest looking at the voltage V3 mentioned in the paper relative to V1. I wouldn`t really expect there to be a resistor value problem with this circuit. I don`t think your circuit will work. You`ve omitted the diode from the 12VDC supply to the MOSFET gates. I would use an individual diode from the +12V supply to each gate, and I would replace the gate-source diodes with zeners to protect the gate. Then I think it would work. But why are you doing this MOSFETs that can switch 350V are readily available. Hey i`m no expert but isn`t it a "protection" matter i may do it so not to blow up anything, but the problem is that i can`t make Q4 even switch on, thats why i stripped everything out to try it as the paper suggests. Hey i`m no expert but isn`t it a "protection" matter i may do it so not to blow up anything, but the problem is that i can`t make Q4 even switch on, thats why i stripped everything out to try it as the paper suggests. Oh sorry. I foolishly thought that it would be helpful and important to prevent you from blowing up your MOSFETs. Of course, you can just add the zeners later, if you can be bothered. If you make the changes I have suggested (diode...




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