Electronics > Projects, Designs, and Technical Stuff

TRIAC circuits at higher frequency

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coppercone2:
Is this ever done? When I think of these components I think only of 60Hz power.

Are there time constants associated with something like RFish use in traditional circuit topologies? audio power transducer, sonar, etc?

T3sl4co1l:
Not much use beyond 400Hz, AFAIK.  At some point, dV/dt of the mains itself, or of nuisance transients from other switching activity, will trip a thyristor.

Some SCRs can be used for pulsed operation down in the 10us range, turning on.  That's about it.

Tim

coppercone2:

--- Quote from: T3sl4co1l on November 04, 2019, 05:46:38 am ---Not much use beyond 400Hz, AFAIK.  At some point, dV/dt of the mains itself, or of nuisance transients from other switching activity, will trip a thyristor.

Some SCRs can be used for pulsed operation down in the 10us range, turning on.  That's about it.

Tim

--- End quote ---

hmm, sounds like you would need to analyze silicone to try to find innovative solution, I suppose a physics analysis should prove it obvious?

I know the SCR is commonly used for pulsed high energy physics, but I was wondering about power signal level use. It's what all the applied usage graphs for device selection show I know, but I wonder if there is something more. I thought there might be a 'horn' some where, or from the sounds of things a hair (speaking in terms of use graphs).

T3sl4co1l:
What?

They aren't used for signals either, as the voltage drop is annoying (0.6-1.5V) and there is a minimum hold current, below which you need continuous gate drive (which is to say, it behaves like a regular BJT).

Tim

coppercone2:

--- Quote from: T3sl4co1l on November 04, 2019, 06:02:32 am ---What?

They aren't used for signals either, as the voltage drop is annoying (0.6-1.5V) and there is a minimum hold current, below which you need continuous gate drive (which is to say, it behaves like a regular BJT).

Tim

--- End quote ---

I mean to regulate in the same manner as they regulate AC power in simple house hold circuits, in the sense of reciprocating continuous action. For what, I don't know. I just wonder how confined this device is.

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