• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Need help in zero crossing detector

Status
Not open for further replies.

losT

New Member
Hi,
can someone tell me wat is a zero crossing detector? wat does a simple zero crossing detector consists of??? do anyone have any schematic that can give me??? Sorry for asking so many qns but really need help here. thks.

Regards.
 

Sebi

Active Member
With zero-cross switch in AC application You can make noiseless on-off.This mean the load switched off or on when the voltage about zero on it. Most of case optotriacs contains this circuit (MOC 3041).
Here is a primitive sematic for better understandig.
 

Attachments

laroche73

New Member
zero-crossing detector

What are you using the detector for? Sebi's right, but if it's just going to be used for timing applications, a true zero-crossing detector isn't necessary. Any circuit that switches at the same point in each AC cycle will work. A voltage divider on a transformers' secondary, followed by schmitt trigger or comparator can generate a square-wave for timing purposes.
 

losT

New Member
I have a project which need me to design a zero-crossing detector. Therefore I need to know wat a zero-crossing detector is. is the picture a zero-crossing detector???? My input is a noisy ac voltage and output a digital 5V pulse.
 
Hey I am telling you what I know about simplest Zero Crossing Detector

Zero Crossing detector is a comparator whose reference or threshold voltage (which is applied at one of the two terminals of the op-amp)
is made zero.

It is used to get a perfect square wave from a sine wave.

If a capacitor and a diode with two resistors (another network) are added
at the output of the simple zero crossing detector then pulses are obtained at the output of the network. (The input of the network is the output of ZCD)
 

shahtejasm

New Member
Zcd

Sebi said:
With zero-cross switch in AC application You can make noiseless on-off.This mean the load switched off or on when the voltage about zero on it. Most of case optotriacs contains this circuit (MOC 3041).
Here is a primitive sematic for better understandig.

hi
how this circuit work?
please give some details of the circuit u attached..
 

ericgibbs

Well-Known Member
Most Helpful Member
shahtejasm said:
hi
how this circuit work?
please give some details of the circuit u attached..
hi,
I would suggest you start a new thread, this one is 5 years old.!:)
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top