Re: [TCML] induction cooktop as TC primary?

[David Sharpe <sparktron01@xxxxxxxxx>]

Jim

As a followup, attached is an application note from Thompson ST for a MCU
controlled half bridge induction heating cooktop.  Feedback controls and
circuitry may be of interest for our DRSSTC / SSTC colleagues in the field...

http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/CD00115561.pdf

Best Regards

On Wed, Jul 4, 2012 at 12:40 PM, David Sharpe <sparktron01@xxxxxxxxx> wrote:
> Hi Jim
>
> I've not seen an actual schematic, however the typical topologies used are
> either a derivative of a Half Bridge (cheap, low cost, up to 2-3kVA output
> with 240VAC in), or quasi resonant (one switch, but complex controls).
> Typical resonant frequencies are 25-100Khz, but could be changed I'd
> think easily by changing value of resonant capacitor.
>
> Tank voltage is monitored, if V exceeds some value (no load, high Q),
> gating is disabled.  Would be an interesting low cost SSTC  / DRSSTC
> experiment.
>
> OBTW, at last RV Rally wife and I attended, there was a single
> burner induction heating "hot plate" being offered for sale from several
> vendors, that IIRC was $129.
>
> Best Regards
>
>
> On Wed, Jul 4, 2012 at 11:58 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
>> In the quest for cheap, moderate power, RF...
>>
>> What frequency do modern induction cooktops work at?  100kHz?
>>
>> ANyone seen any schematics?  What sort of devices are they switching with?
>> I'm sure it's some sort of direct off-line scheme, but they can't be too
>> cavalier, because of EMI/EMC rules.
>>
>> The little single "burner" table top units are 1500W and cost about $60-70
>>
>> Could one just get a table top unit , put an appropriate secondary on top of
>> it and be making sparks?
>>
>> What about safety interlocks?  Do they not turn on the coil current unless
>> they detect a pot (I've seen that "feature" mentioned in some of the sales
>> brochures)
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>
>
>
> --
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA USA
>
> Sharpe's Axiom of Murphy's Law
> "Physics trumps opinion!"



-- 
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA

Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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