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raf23
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Join Date: Feb 2010
Location: cochin,kerala
Posts: 18

Need Help With a Schematic

04/04/2013 7:18 AM

Hi
I have a circuit diagram which i believe is for a zero crossing detection. if it is of zero cross detection ,can any one tell whether it is VZC or CZC ? Also it would be helpful if someone can tell the waveform at the collector pin of transistor with respect to ac waveform.
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Yahlasit
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Join Date: Dec 2008
Location: Cd. Juarez, Chihuahua, Mexico.
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#1

Re: Need Help With a Schematic

04/04/2013 10:17 AM

It is an extremely poor design of a VZC, I don't think it will even work at all, it looks like it will turn ON once (and late by the way), and stay ON forever.

You obviusly borrowed it from somewhere, if it was your design, you would know whether it was a VZC or a CZC, you have to start doing some serious research.

Start here.

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raf23
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Location: cochin,kerala
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#4
In reply to #1

Re: Need Help With a Schematic

04/05/2013 12:30 AM

thanks.
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SolarEagle
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Join Date: Mar 2007
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#2

Re: Need Help With a Schematic

04/04/2013 10:20 AM

This might help....

http://sound.westhost.com/appnotes/an005.htm

Zero crossing detector wiring diagrams....

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Yahlasit
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Location: Cd. Juarez, Chihuahua, Mexico.
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#3
In reply to #2

Re: Need Help With a Schematic

04/04/2013 12:38 PM

Yes, that will certainly help, GA.

It doesn't introduce more delay with an extra diode from the common cathode of D1 and D2, and uses a resistor (R1) instead of a capacitor, this pulls the signal down to zero each semi-cycle, while a capacitor would convert the pulsating DC into a filtered DC, thus keeping Q1 ON all the time.

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raf23
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Location: cochin,kerala
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#5
In reply to #2

Re: Need Help With a Schematic

04/05/2013 1:03 AM

Hi

Thanks for your reply. I could understand the first pair of wave forms you provided. ie the waveform at the collector of Q1,but didn't get the 2nd pair of wave forms. ie the square wave form. Has it got any connection with the circuit you provided?
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metalSmiths
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#6
In reply to #5

Re: Need Help With a Schematic

04/05/2013 2:49 AM

Following SE second link to this page has this diagram. With info and the second waveform.

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