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ful babu
Joined: 11 Nov 2004
Posts: 167
Helped: 11
Location: Singapore
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 27 Jul 2005 12:17 zero-crossing vs non zero-crossing Optoisolators ?? |
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wat is the difference bet zero-crossing and non zerocrossing optoisolator triac drivers ? ( like MOC3011 and MOC3042) how to use them to drive triac ???
thx
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27 Jul 2005 12:17 Ads |
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IanP
Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast
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27 Jul 2005 14:13 Re: zero-crossing vs non zero-crossing Optoisolators ?? |
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The only difference will be in the "noise" generated by both options.
The "zero-crossing" will be almost noise-less, as it is swithed on and off when the current/voltage is at "zero", whereas the phase-controlled option will generate a lot of electro-magnetic noise .. as the switchig point can be anywhere between 0-180°/180°-360°..
Regards,
Ianp
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Engineer_Bob
Joined: 13 Jan 2005
Posts: 38
Helped: 6
Location: UK
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29 Jul 2005 21:37 zero-crossing vs non zero-crossing Optoisolators ?? |
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Hi Ful Babu
I agree with IanP but thought that is was also worth mentioning that the zero cross over is also useful for taking stress off some load types.
For example if your driving a filament lamp it’s helpful to ensure you switch on when the voltage is at zero, rather than applying the peak voltage across a cold filament.
Regards Bob
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