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marv ...



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...   Erstellt am 14.11.2006 - 00:28Zum Seitenanfang Beitrag zitieren Beitrag melden Beitrag verändern Beitrag löschen


Hi!
As the board rules say, I try to write in eglish...

I finally found the right circurit for a voltage controlled dimmer! Great work!

I would like to build the analog-dimmer and have some questions to the circurit:

First to the controller, I dont really understand what R7 and C4 do? You wrote that they do the "Netzanpassung", what does that mean?

The function of the comparator on the output is obvious, but you wrote that it sets a "high" when the blade voltage is lower than the input voltage. Shouldn't be the blade voltage be higher than the input to set a "high"?

And a last question to the power unit: where do I connect the power supply and the load if I don't want to use the heat sink? It seems to make most sence to set it parallel to the triac (source and load in line).

Thanks in advance!

regards,
Marvin




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...   Erstellt am 14.11.2006 - 14:42Zum Seitenanfang Beitrag zitieren Beitrag melden Beitrag verändern Beitrag löschen


Hi, Marvin!
Because the mains is a sine, a linear dimmer curve won't lead to linear dimmer response. With R7 and C4 the curve is modified to make dimming mor linear.

The OPAs are used as current sinks for the power modules. As long as the ramp is higher than the input signal, the OKs won't be fired.

One of the AC-Lines is connected to the isolated mounted heat sink. The power is distributed to the power modules via the heatsink. The power modules are connected with the loads and the loads are connected with the other AC line. That's the easiest way to distribute large amounts of current.

best regards, hendrik




marv ...



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...   Erstellt am 15.11.2006 - 00:23Zum Seitenanfang Beitrag zitieren Beitrag melden Beitrag verändern Beitrag löschen


Thank you so much!!

Marvin





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