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  1. #1
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    memarian's Avatar
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    High Voltage Fan Control ( High Voltage Spikes,High Reliability)

    Hello,

    I'm building a Fan Control Circuit for controlling the speed of a 380V Fan.(380V RMS, ~540V Peak-max 150W) using a microcontroller.
    My main circuit is something similar to this FreeScale Application note : http://cache.freescale.com/files/mic...ote/AN3471.pdf
    In my circuit, I have a different microcontroller, Optotriac and Triac. I can select the optotriac between MOC3082 or IL4208 (Both 800V).My main Triac will be BTA208X-1000 (1kv).
    These components are currently used in our circuits and already available, so using them can be cost effective and more preferable than a new component unless we have to.

    My Main problem is : This circuit will be used in an industrial place with working welding machines. Because of the effects of welding machines on main 3-Phase AC POWER, there is some spikes up to 1kv on AC-Line. I'm not sure if the optotriac can take this for long period and i couldn't find any 1kv optotriac. How can i protect the optotriac against these spikes? How can i increase my circuit's reliability?

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  2. #2
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    kam1787's Avatar
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