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Registered Member #2411
Joined: Sat Oct 03 2009, 05:50PM
Location: South Texas, USA
Posts: 11
I got a question,
How would a cockroft walton voltage multiplier react to a phase angle fired AC signal (60Hz)? To get to the point, would you be able to effectively control the output voltage of the voltage multiplier (no load)?
Registered Member #2411
Joined: Sat Oct 03 2009, 05:50PM
Location: South Texas, USA
Posts: 11
I gave it a try in pspice. I Use triac and pulsed its gate at the desired angle of the input sine wave (168v amplitude). First i used a resistor as the load and i got the correct phase angle fired signal. But, when i tried putting a voltage doubler as the load, it didnt work, the triac would not fire correctly. I read somewhere that the triac controlled circuit is made primarily for resistive loads. Are there any other methods of phase angle firing that would work well for the multiplier?
After i put a small (50ohm) resistor in parallel with the doubler, it seemed to work, but only for nF value caps.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I've built two phase angle controller circuits that I believe will work with anything. Including CW multipliers and so on.
The secret is "hard firing": you hit the SCR or triac with a stream of repetitive gate pulses during the whole time that it's supposed to be on, unlike a dimmer, which only gives a single firing pulse. You also derive the gate pulses from a separately powered circuit, again unlike a regular lamp dimmer, which is powered off the voltage across the triac during the off period.
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Phase angle Firing and CW voltage multiplier
