Re: Toaster Oven dimmer ?
- From: Mochuelo <cucafera@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 29 Jul 2005 17:47:44 +0200
On Fri, 29 Jul 2005 11:35:00 +0200, Sylvain Munaut <com.246tNt@tnt>
wrote:
>Hello,
>
>To try to approximate the temperature profile of a reflow oven, I'd like
>to make a computer controlled dimmer for a toaster oven.
>
>Does any one here as a schema / base where I can start from for the
>Hipower part (digital and pc interface is ok). I found some dimmer
>schema but they where all for light and a power of 500W max. Here, the
>heating element is more like 2500W. Is it just a matter of putting a
>bigger triac, that can handle that load ?
That's an option. Another one is to use two MOSFETs in "anti-series."
Tie their sources together, and also their gates together. Effective
total switch between drain1 and drain2. Excite between gate and source
with Vgs > Vgs_th. The advantage of this over the TRIAC is that it
consumes nothing, from the excitation circuit, while in static
conditions. In your application, you have very few transitions, so
this makes sense.
>
>
>Thanks,
>
>
> Sylvain
.
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