Hi All,
Thanks for being here.
I've been driving 16 sic fets with 2 drivers for a pulse motor and all is working well until I up the voltage to 60v battery power.
Usually one of the fet drivers fails and catches on fire at 60v. Runs fine at 36v.
I need some advice that will head me in the right direction.
I'm using the IXDI614PI /SI (inverted driver) it works well with the opto sw.
Better understanding of mosfet driver for these fets and better resistor choices is my need.
Thanks,
Donald

 

I need a schematic to understand what you are doing.
On the PCB, I do not see any capacitors.

 

All your verbal arm waving does little to explain how things are actually connected.
Post a complete schematic of what you have, as Ron suggested.

 

IXD_614 has maximum rating of 40V.

 

I see an optical interrupter data sheet, I hope that is not what is being used as an opto-isolator to drive the fets. FAST switching is required no matter what the device is, and using a slow device to drive the gate will not ever work.
In addition, heat sinking adequately is mandatory.

 

Why 650V FETs for a 60V supply?

 

Hi All,
I made some changes to the driver board and now it's running well at 60v input.

The charge bank is being charged with flyback energy (700v spikes)
Banks are swapped at 3 minute intervals.
1 bank is 5, 750cca automotive batteries.
Close to the end of the vid there is a swap and one can see the bank meters reverse direction.
Short explanation at end of vid.
Concept is for extended run time with electrical generator running off the shaft.

Dropbox link to today's 60v run video and scope shot of driver pulse from one driver.
https://www.dropbox.com/scl/fo/4hzexwcvy5jn3irqs1uz2/h?rlkey=5fk8ivpqoq0yy791x2fbjx34h&dl=0

Donald

 

Corrected R values for R6,7,12 and 13 on 2nd DRV BRD .pdf.
Reattached.