RE: [TCML] Ac transistor (AC scr = triac )

["Lau, Gary" <Gary.Lau@xxxxxx>]

If this is for a high frequency application, then a triac is probably not suitable.

I'm pretty sure that RF power engineers have figured out how to use existing devices to efficiently drive high frequency coils.  Yes, you may sometimes need more than one, but that's just the price of admission.

Designing transistors is a complex and rigorous science not well suited to hobbyists.  If it's not already, it should be off-topic for this List.

Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of b alex pettit jr
> Sent: Tuesday, June 24, 2008 6:34 AM
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Ac transistor (AC scr = triac )
>
> Is this what you are looking for ?
>
> TRIAC
>
> The TRIAC is a three-terminal device similar in construction and operation to the
> SCR. The TRIAC controls and conducts current flow during both alternations of an
> ac cycle, instead of only one.
>
> The triac is used in an ac environment, so it will always turn off when the applied
> voltage reaches zero at the end of the current half-cycle. If we apply a turn-on pulse
> at some controllable point after the start of each half cycle, we can directly control
> what percentage of that half-cycle gets applied to the load, which is typically
> connected in series with MT2. This makes the triac an ideal candidate for light
> dimmer controls and motor speed controls. This is a common application for triacs.

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