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'[OT] DIMMER'
2000\05\23@073149 by moshe

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HI FRIENDS.

I'M  IMPLEMENTING  A DIMMER WITH A DIMMER I.C ( PHASE CONTROL )
MY LOAD IS 100W INCADECENT LAMP AND THE INPUT VOLTAGE IS 230V 50HZ.
THE POWER STAGE - INCLUDES TRIAC-PHILIPS-BT138, A SERIAL RFI CHOKE - 60
microHenry,  A PARALEL CAPCITOR -100NF/275VAC , THE CAPACITOR IS PARALEL TO
THE LAMP AND THE CHOKE.
WHEN I TURN ON THE TRIAC BY APLYING CONSTANT CURRENT TO THE GATE - ALL ITS
FINE.
BUT, WHEN THE TRIAC GOT A PULSE IN IT'S GATE ( B.W=33 microsecond from the
DIMMER I.C - EVERY HALF CYCLE.) AFTER SOME MINUTES ,THE TRIAC BECAME  VERY
HOT!!!!!
CAN ANYONE HELP ME TO SOLVE THE PROBLEM??

THANK YOU VERY MUCH.
MOSES.
Email:spam_OUTmosheTakeThisOuTspamgad-univ.com

2000\05\23@081523 by mail.lantic

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hi..

If u can post me your schematic to have a look at then maybe we can solve
your problem..

It kinda sounds though like thermal run-away..

Kind Regards

Maxtron

2000\05\23@082809 by piclist.com

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{Original Message removed}

2000\05\23@085331 by M. Adam Davis

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Is this a single pulse, or a series of pulses during the phase of the AC cycle?
If it is a series of pulses, the issue may have something to do with
instantaneous current, which is very high, if you turn the triac on anytime
other than zero crossing.

This is OK, the triac will get hot.  Make sure it is rated properly for the
load, and make certain you have it properly heatsinked.

-Adam

moshe wrote:
{Quote hidden}

2000\05\23@103140 by moshe

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Hello Adam.

It's a 1 pulse per half cycle the duration of the pulse is a 33 microsecond.
The triac is for 12A instantaneous current - type BT138 - TO220 case
When the triac is in a continues on - the gate is fed with continues voltage
the triac is cold. When I started to dim the lamp - pulses in the gate, then
the triac is getting very hot.
Its not normal hot for such a triac and load ( 100w incandescent lamp)

Thank you .
Moses.
       > Email:.....mosheKILLspamspam.....gad-univ.com

       {Original Message removed}

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