The Electronic Measurements Inc. TCR series are SCR phase controlled regulated power supplies. Output is controlled by modulating the conduction angle of the controlled SCRs. Input AC is applied to three pair of bi-directionally connected SCRs placed within the delta connected primary of the main power transformer. Secondary voltage is rectified and double L/C filtered to provide a low ripple DC output.
You can't do that with a Triac.I want a Triac that will let me chop a full 120VAC cycle into a few hundred PWM pseudo-squarewave "slices". Just for kicks.
Can you expand on this? Any drive I worked with required phase synchronization with the trigger circuitry. If the phasing on only the line feeds to the SCRs was rotated without rotating the trigger sync lines, we got a lot of smoke. Is this what you meant?@ bountyhunter
Line synchronization is also immune to phase rotation.
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by Robert Keim
by Jake Hertz