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Self Regulating AC Phase Controller for Heater

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  • #16

    Click image for larger version  Name:	20180724_185208.jpg Views:	1 Size:	311.3 KB ID:	10621115
    Testing with 44W Nichrome bath heater, most likely 99.9% similar to Nichrome 200W pad.
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    Full power warming up to 90F, only 60hz present as expected.
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    At 90F, chopping when stabilized, few harmonics popping up, quiet as mud out in the great beyond.........
    Last edited by sam am I; July 24th, 2018, 08:12 PM.

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    • #17
      ExpressPCB file here if interested.... Spazzed the PCB layout by hand, no net list and no auto routing, I think I got it all though

      I added a 6 pin header for programing, I use Microchip Pickit3 hence the 12F1840 (U6).


      Click image for larger version  Name:	Squirrel Heater RR_b.jpg Views:	1 Size:	1.71 MB ID:	10623071Click image for larger version  Name:	Squirrel Heater RR_Page_2.jpg Views:	1 Size:	250.1 KB ID:	10623070Click image for larger version  Name:	Squirrel Heater RR_Page_1.jpg Views:	1 Size:	433.2 KB ID:	10623069
      Last edited by sam am I; July 27th, 2018, 03:39 PM.

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      • #18
        Finished PCB Front Back

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        • #19
          Fin

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          • #20
            Last 5 days/nights..........Have heater temp set to 60 F, the thermostat (temp sensor) is up near the ceiling in the nest, didn't want the chewies laying on it and throwing it off.

            So by the numbers, it appears there is about a 5 degree gradient from where my internet temp monitor is reading (at critter level) and the ceiling stat.

            Click image for larger version  Name:	untitled.jpg Views:	1 Size:	90.3 KB ID:	10660434

            Plot done in Matlab

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            • #21
              ... Click image for larger version

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              • #22
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                The power wires on the "heat proof" ceramic 200W Halogen bulb holder finally burn't/cooked themselves off their mounting post, good time to switch out.......... Switched over to this pad finally. Works great! These pads need a heat sink (oil pan) else the pad will self destruct in hours.


                Click image for larger version  Name:	20190203_115529.jpg Views:	1 Size:	695.4 KB ID:	10702271

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