Hey guys this is my first post on stack exchange so please go easy on me!
I have a hobby project where I was trying to make a few batteries go in series using a micro controller and a floating power supply (in this case an isolated DC-DC converter), the arduino is powered separately.
I've attached a schematic of the rough problem.
The arduino needs to be isolated from the rest of the higher powered battery stuff which is why I have used an isolated DC-DC converter and an opto-isolated mosfet driver
The output of the opto-isolated driver is hooked to the gate of the mosfet and the COM terminal of the dual output converter is hooked to the sources of both mosfets. This lets the mosfets see a +15V and the -15V drive signal. (please dont pay attention to the irf530 i just used the default on circuit labs and have some mosfets that can handle +/-30V for gate to source voltage)
My issue is that instead of buying more DC-DC converters and opto-isolated drivers to drive each next pair of mosfets, is there a way to power the next set using the same DC-DC converter and isolated driver? I need to add six more pairs of mosfets and batteries and thought that someone might know a cheaper way than buying more converters and drivers. Perhaps someone knows how you could use caps, resistors or diodes etc to do it.
Another issue that I have had is that if I were to connect the output of the isolated driver to the gate of the next pair of mosfets that would be okay but if i go to connect the COM terminal to sources of the next pair aswell it would create a short that bypasses the next battery.
- DC-DC converter is the DPU01M-15
- Driver is the FOD3150
- Switching frequency range from 1Hz - 3kHz
I hope that makes sense
Thanks for any help in advance!
EDIT: The switches will turn on and off simultaneously