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Controlling an electric hot plate

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Screech1

New Member
I was thinking of using a 555 timer with a varible duty cycle circuit to controll an electric hot plate of about 2000 Watts @ 240Volts.
It will be running for up to 9 hours at a time.


8858-721426e.jpg


I only have experience with using transistors and relays to power my circuits.
I don't think they are good enough for this application. (transistors need heat sinks and relays wear out.)

Is there a component that would do the job that does not require a heatsink?

thanks.


ps. I'm back.
Lost my password.
 

Boncuk

New Member
Use a solid state relay (Sharp S202S02). It has a built in zero crossing unit and can switch up to 8Arms (with heat sink). Required LED current is 20mA at Uf=1.2 to 1.4V.

Use a maximum of 90% duty cycle not to exceed the maximum allowable current.

Otherwise use a BTA41 triac (up to 40A) together with a zero crossing optocoupler (MOC3041M).

Try to get the timer output frequency close to 50Hz to prevent triac misfirings.

Otherwise use a MOC3021 (w/o zero crossing unit).

Boncuk
 

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