I am going to designing a PCB for a high voltage, 6kV and 3kV @ 10mA/200mA (660W) power supply for my Ph.D. As you will know, the equipment needed to work at this level is very expensive and as a student, the money available in my account is limited yearly.
With this in mind, what are the quintessential safety precautions that will be needed for my lab work, and possibly within the DC/DC supply itself? For example, is a short circuit or open circuit protection best, or should I have both? At the moment, all I have in my design is my isolated feedback circuit which will isolate the control board from the converter output. But I am worried that faults will destroy my equipment and they will be costly to replace.
If anyone has any recommended techniques for open/short circuit protection at such high voltages, it would be recommended. I plan on having a pulse-to-pulse current limit of the primary transformer current, but I would like to add some more features to address my concerns of faults such as short circuit protection on the secondary current level. I am thinking of having a comparator circuit driving some LEDs as a voltage level indicator also, for example. This will show me how much voltage is on the secondary side and indicate when safe working voltage is reached. I have also come across a circuit which is for overvoltage and overcurrent protection which looks like it might do what I want: https://www.qsl.net/yo8tot/overvoltage.html
But I would also like a level indicator of sorts where maybe an LED lights when a low/safe working voltage has been detected and I am able to modify my circuit safely if that makes sense.
I would rather design in now for the most likely faults rather than worrying about it once I come to the bridge. The load is purely resistive for the purposes of my project.
Any recommendations are appreciated.
I will be using digital controller, but am not against using some analog components to interface between my controller and the output voltage in case they are faster and more reliable for example.