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High voltage layout

Carvey

Hello

 Engineer wants to design a board that will see 3KV.

He wants to mount some 15 ohm, 25 watt resistors like thru hole components.

They are  not designed for use that way.

I'm advising against that approach.

This not a customer board but lab use only.

The trace width for this voltage is .300 wide.

I think this should be treated like a breadboard and hardwired.

Anyone like to suggest an idea?

carvey

  • eephillip

    I can't think of any reason why you couldn't use a pcb at 3kv, your just changing the dielectric material from air to something else. Design within the boards capabilities and it should be fine.

     

     

  • Mashak

     If you run the high voltage (3KV) traces in internal layers with a Spacing of 800 mils then i think it should be fine (As per NEMA. On surface they require a Spacing of 3500 mils.

    Also if you want to use a resistor which has a less Pitch then you can make a Slot between the two pins on board which will increase the creepage.

  • Robert Finley

    I think I did that once in the late 80's.  A bank of TO220 fets wired together to modulate a high voltage potential.

     I don't think it is totally ncessary to have a multi-layer board as long as you can surround the power source with something that increases the breakdown voltage over that of air.   If there is arcing, you can increase the trace spacing or use a resistor with larger pin spacing or cover one side of the resistor with silicon adhesive or other acceptable material.

     Just make sure that it has a higher breakdown voltage than air. 

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