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Registered Member #1509
Joined: Thu May 29 2008, 05:53AM
Location:
Posts: 7
Hi guys, I am going to draw PCB for my SSTC half bridge part by using Protel, does anyone have any idea about the track size? I know the track size must be wide, but I have no idea how wide should it be? I am going to use mains as my power supply, which is about 240V.
I will be very appreciate for any of your great answers. Thanks!:)
Registered Member #120
Joined: Fri Feb 10 2006, 07:07AM
Location: Westchester New York
Posts: 83
This actually depends more on the amount of current rather than the voltage. However the higher the voltage the more distance between traces is needed to prevent arcing. But basically stick to this, 0.010" 0.3 Amps 0.015" 0.4 Amps 0.020" 0.7 Amps 0.025" 1.0 Amps 0.050" 2.0 Amps 0.100" 4.0 Amps 0.150" 6.0 Amps
Registered Member #1509
Joined: Thu May 29 2008, 05:53AM
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Posts: 7
Thanks for reply. :) But I still don't know how to calculate current amount. do I calculate it by voltage divding by the impedance of the primary winding?
Registered Member #1509
Joined: Thu May 29 2008, 05:53AM
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Posts: 7
teslacoolguy wrote ...
You can also put a think bead of solder along the trace and that will improve the current carrying capability quite alot.
What does a think bead of solder mean? do you mean just solder an iron on the track of the PCB? but if soldering on the trace not carefully done would easily destroy the trace. :|
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068
Thickness of the PCB trace is based on temperature rise in the copper, not the current capability. A 1 mil trace can handle 100A of current, but will likely heat up and explode before it can do so continously.
Basically, solve the equation for the max. temp rise you want in the copper:
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
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Dr. Shock wrote ...
Thickness of the PCB trace is based on temperature rise in the copper, not the current capability. A 1 mil trace can handle 100A of current, but will likely heat up and explode before it can do so continously.
Basically, solve the equation for the max. temp rise you want in the copper:
Where Area = Width of Trace (mils) * Copper Weight (mils) Use 1.2 mils for 1oz, 2.4 mils for 2oz, etc...
These equations are for external conductors in air/ground environment.
But if you are making your own board, just make the traces as thick as you can to be safe.
That seems like pretty good advice. You can use 10,20 and 30 degrees above ambient as well. I don't think 100c would be a good idea. If you don't want to do math, look up a chart on the net. For your half or full bridge outputs just use floods. There will be plenty of copper even on a 1 ounce board. To be safe you can also double up layers. Just make sure you don't run earth ground traces on your SSTC boards. You will get arcing and weird interference.
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SSTC PCB track size for 240V (from mains)??
