Hello,
I'm in the early stages of desiging my own kossel-style printer. I would like to drive the heated bed with mains voltage in order to reduce the power requirement on the power supply.
Even if the following is an insane idea, I would appreciate an explenation along with the name-calling! ;)
So, the basic idea is to order a board like this, and power with mains voltage.
BUT! since just connecting it to mains will certainly fry it within a second or two, the idea is to use a solid state relay like this one in order to PWM the mains power.
The above bed is 1.2 ohm, so with 240vac, it would produce about 48Kw (right?), assuming I want the bed at ~100w, I'd need the PWM to be about 0.2% (right?), or on for 2ms out of every sec...
Thanks!
-Leav
I'm in the early stages of desiging my own kossel-style printer. I would like to drive the heated bed with mains voltage in order to reduce the power requirement on the power supply.
Even if the following is an insane idea, I would appreciate an explenation along with the name-calling! ;)
So, the basic idea is to order a board like this, and power with mains voltage.
BUT! since just connecting it to mains will certainly fry it within a second or two, the idea is to use a solid state relay like this one in order to PWM the mains power.
The above bed is 1.2 ohm, so with 240vac, it would produce about 48Kw (right?), assuming I want the bed at ~100w, I'd need the PWM to be about 0.2% (right?), or on for 2ms out of every sec...
- Is my math right?
- would this work, theoretically?
- what's the minimum PWM pulse time with major boards? i'm guessing 2ms isn't possible, but maybe 20ms is?
Thanks!
-Leav