heater with ckm005 microcontroller

Posted on Feb 5, 2014

We see the control board with 7-segment LED display for temp and power readout up in front. The obligatory fan mounted down in the base of the unit, and a lovely induction coil. Looks like about the same gauge Litz wire as the Burton unit but with a much nicer coil former. We`re hoping it`s not all glued together in a big shellac clump like the Burton, so the coil can be disassembled and re-wound into a cylinder.

heater with ckm005 microcontroller
Click here to download the full size of the above Circuit.

Aside from the melted black plastic formers, it APPEARS there`s nothing too troublesome holding the coil in place, which is a very encouraging sign. Next comes the power stage board. Again, very clean and simplified design. There`s the input filter/current feeding inductor up there in the upper left, the nice hefty blue caps for the resonant tank and feed tank, and MANY fewer components than the Burton. Compact, and probably much cheaper to produce. Ahh, the big boy himself. The venerable 25N120 IGBT. 25A and 1200V of pure power switching fury. A little slow for chopper based converters, but for this type of high current soft-switching application this device cannot be beat. It`s interesting that this cooker gets away with only a single IGBT not sure if it`s lower powered than the Burton, or whether only a single IGBT is needed to get enough power over there in 230V land. Lucky bastards! Again, cleaner and more compact. And nicely diagrammed in white silkscreen to make circuit tracing easier! Excellent! Ad has been kind enough to label a few of the power stage components for us in red, along with their values. So that`s it for the extended tour of the insides of the new device. We`ll continue on with the remainder of the original post from yesterday as we puzzle out the function of the power stage. But rest assured, we are now opening eBay and looking for this little gem to see for ourselves what treasures it holds. Let`s...

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