Re: Custom Quantum/Hadron PCB Heated Build Plate
Posted: Fri Feb 24, 2012 2:31 am
I agree too
So the idea is you have the flexibility to feed it whatever voltage and power you like and it will work: 12V by default, or 5-6V, or 24V if you prefer.
You can easily connect it any which way you prefer.
Copper has a pretty high temperature coefficient, so the power output drops off pretty quickly as it warms up.
- If you feed it 24V, you get 300W@12A max (cold); But by the time it gets to 60C its dropped to 260W@11A ; at 100C its 230W@ 9.7A; at 150C its 200W@ 8.5A;
- If you feed it 12V, you can select low: 150W(12A) or high: 300W (24A) (max cold), your choice; 12V on low drops to: 130W/11A@60C; 115W/9.7A@100C; 100W/8.5A@150C;
Currents are proportionately higher at 5V of course but this option is only useful if you're planing to use an ATX power supply + custom electronics anyways (like me), others can just ignore it.
At least that's the theory.
I've been in contact with a couple of my usual PCB manufacturers to get their inputs on plating tolerance so i can work that into the spreadsheet as well,
i should get answers on that tomorrow.
I hope to finalize the layout this weekend and have prototypes to test about a week or so later...as they say, the proof will be in the pudding
So the idea is you have the flexibility to feed it whatever voltage and power you like and it will work: 12V by default, or 5-6V, or 24V if you prefer.
You can easily connect it any which way you prefer.
Copper has a pretty high temperature coefficient, so the power output drops off pretty quickly as it warms up.
- If you feed it 24V, you get 300W@12A max (cold); But by the time it gets to 60C its dropped to 260W@11A ; at 100C its 230W@ 9.7A; at 150C its 200W@ 8.5A;
- If you feed it 12V, you can select low: 150W(12A) or high: 300W (24A) (max cold), your choice; 12V on low drops to: 130W/11A@60C; 115W/9.7A@100C; 100W/8.5A@150C;
Currents are proportionately higher at 5V of course but this option is only useful if you're planing to use an ATX power supply + custom electronics anyways (like me), others can just ignore it.
At least that's the theory.
I've been in contact with a couple of my usual PCB manufacturers to get their inputs on plating tolerance so i can work that into the spreadsheet as well,
i should get answers on that tomorrow.
I hope to finalize the layout this weekend and have prototypes to test about a week or so later...as they say, the proof will be in the pudding