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Fikre
Joined: 09 Apr 2006
Posts: 2
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 Posted:
Sun Apr 09, 2006 7:14 am Post subject:
Firing Circuits or Triggering Circuits |
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I am working on a project of firing circuits. These circuits are to be used in controlling the conduction sequence of SCR in full bridge converter(rectifier). The input I can use is the voltage I get from the outlet 220-V.I have built the circuit to give me a 12-V DC output, but I need to chop this DC voltage to pulses so that I can supply it to the SCRs. The problem is that the pulses should be synchronized with the AC source, from the outlet. Besides there should a means to control the firing angle of the pulses, in other words their positions from the zero crossing of the AC source.
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Hello everybody, it's Fikre. |
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neon
Joined: 25 Feb 2006
Posts: 598
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Sat May 20, 2006 6:35 pm Post subject:
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| just an idea why not use the primary AC and delay the angle for firing SCR gates |
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Fikre
Joined: 09 Apr 2006
Posts: 2
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Wed May 24, 2006 10:33 pm Post subject:
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The scrs should be supplied with pulses in order to trigger them. The sine wave has a zero crossing which can commutate the scr. Moroever, the angle control becomes easier with pulses.
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neon
Joined: 25 Feb 2006
Posts: 598
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Mon Jun 19, 2006 12:13 am Post subject:
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| I sure hope AC has a zero voltage crossing otherwise it will never shut off. And frike your pulses got to be sychronized with AC comin in right you forget to mention that. |
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