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I have a TEG that has an output IxV curve like this: enter image description here

That should mean something like this:

enter image description here

I need a simple circuit to regulate the voltage around 12 V while enabling at least ~10 W for some load I have (0,833 A)

My idea was to use a simple zener diode, a capacitor and a voltage regulator for the 12 V output

enter image description here

What do you think? for R1 I thought about 5-30 ohm, for Zn1 30 Vbkd and C1 ~ 0,00001 F.

Do you have any comments about the layout or values?

Thanks in advance!

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    \$\begingroup\$ Use a buck converter. Max power you can get (from that graph) is 48V 0.33A or a shade over 16W. The buck can translate this to 12V at about 1.3A. \$\endgroup\$ – user_1818839 Apr 8 at 11:55
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Get rid of R1, it wastes power.

Get rid of the 7812, it wastes power.

Get rid of ZN1, it may waste power.

Replace the regulator with a switching 12 V output regulator.

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  • \$\begingroup\$ Thanks for the answer! I thought about this, but could not find any converter to handle the 100 V max input, at least where I live. What would happen if I connect two buck converters in series? \$\endgroup\$ – Fábio Apr 8 at 12:32

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