A heated bed has normally a by far larger thermal mass (and therefore thermal inertia) than a hotend and also the stability and accuracy of the temperature is far less critical, so a simple two point regulation is totally adequate, i think.
As for the switching setup, i would go for a rather simple MOSFET design (a MOSFET, a z-diode and two resistors). Actually i'm just in the process of building my own heated bed addon for my UM original. SSRs are also ok, but it's often easier and cheaper to find a good High-Power n-type MOSFET with a very low on-resistance (minimizes power- and heat-dissipation).
Best regards
Neni
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gr5 2,295
Wow. Please post photo!
That's what I did. My heated bed power supply is from a computer and I just use the digital pin that turns it on and off to turn it on and off. Instead of switching the high current of the power itself. My power supply hasn't died yet.
PID stabilization makes no sense with my heated bed. A simple over temp off, under temp on is all that I need. Like a house thermostat.
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