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Old 18th August 2003, 04:29 AM   #1
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Default Triac Question

Can they be paralled to handle more current ?

Thx, vinay
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Old 18th August 2003, 04:37 AM   #2
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a Triac is for AC and the best route is to drive a relay through a opto-coupler (ex. Moc 3010)

you did not mention for what application

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Old 18th August 2003, 12:07 PM   #3
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"Can they be paralled to handle more current ?"

No, use inverse parallel SCRs of the needed current and run a MOC triac driver between the gates.

Motorola (ON Semiconductor) has an app note on this subject.

http://www.fairchildsemi.com/ds/MO/MOC3041-M.pdf

Same thing, Fig 14, 15
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Old 18th August 2003, 12:13 PM   #4
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TRIAC's are rather cheap. I suggest you use one with the rating you need. 25 A costs in Sweden 3 USD a piece from a expensive place.

Avoid pararelling, without going into why.
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Old 18th August 2003, 03:59 PM   #5
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Thanks for the responses.

I want to use it as the mains switch for my power amps.

Vinay
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Old 18th August 2003, 04:17 PM   #6
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Note: The TRIAC introduces noise so you will need a main filter.

I suggest that you start with an ordinary relay. Switch to a triac if the lifetime of the relay is too short, even with necessary protection.
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Old 18th August 2003, 07:09 PM   #7
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Triacs introduce noise in the power line not only from the
action of the switching at high frequencies, but also a DC
component due to asymmetric switching. Users of Triacs to
switch the power into the primary of their power transformers,
particularly toroids, would be best advised to drive the triac
control pins hard to avoid the DC issue.
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Old 26th August 2003, 12:57 PM   #8
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How to drive the control (gate) pins hard Currently I used a stud mount triac 2n6162 rated 600v 300amp for my Aleph 5, between the gate ( G ) and anode ( MT1 ) i've connected 2 thermo switch in series, I don't think this will put any load on the control pin. Thanks
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Old 26th August 2003, 08:31 PM   #9
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By driving the control pin hard, I mean turning the Triac
on very early in the AC cycle so that there is as much symmetry
to the waveform as possible. Usually this means low resistance
in series with the control pin so that it turns on right away.
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