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I want to drive an AC 220 V load(heater) controlled PWM from Microcontroller. I want to use power FETs to load drive upto 2000 Watts. I m not guessing any valuable circuit design. If anyone have any idea to do this, please help me out... thanx for all...

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  • \$\begingroup\$ Why FETs and not a triac? \$\endgroup\$ – Andy aka Dec 16 '15 at 10:07
  • \$\begingroup\$ Or even back to back SCR's? For higher power applications, it's tough to beat SCR's on a cost basis, and I really doubt you want to PWM an AC source, I'm thinking you just want plain phase angle control. Super simple and inexpensive. \$\endgroup\$ – R Drast Dec 16 '15 at 11:51
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If anyone have any idea to do this, please help me out

You can do this with a triac and opto-couplers: -

enter image description here

Here's another idea using a 555 timer: -

enter image description here

Note that this is only good for a few hundred watts - you'd need a more powerful triac and drive interface for 2 kW. The circuit below might give you 1 kW: -

enter image description here

Looking around at triacs I think the BTA41 should be man enough for the job.

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  • \$\begingroup\$ thank you very much dear. I implement this scheme and then tell you about results. thankx \$\endgroup\$ – abdul razzaq Dec 17 '15 at 13:23
  • \$\begingroup\$ hi dear, I want to ask 2 questions: 1) can we use triac in parallel more than 1? 2) can we control heater with PWM? (because I heared that time constant of heater is large and cannot be controlled by PWM) \$\endgroup\$ – abdul razzaq Dec 19 '15 at 6:35
  • \$\begingroup\$ This sounds like an evolving set of questions so please be aware that my answer addresses your original question. However, in my opinion I'd say yes to your two extra questions. \$\endgroup\$ – Andy aka Dec 19 '15 at 10:08
  • \$\begingroup\$ Thank you very much, I implemented and tested. this is working fine. thanks a lot! \$\endgroup\$ – abdul razzaq Dec 19 '15 at 13:08
  • \$\begingroup\$ @abdulrazzaq I'm pleased for you and, in return, it is customary for you to press the "accept" button located just below the up and down arrows alongside my answer. \$\endgroup\$ – Andy aka Dec 19 '15 at 13:11

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