Author Topic: Seeking a zerocrossing SSR without using Microcontroller!  (Read 1539 times)

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Offline Md Mubdiul HasanTopic starter

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Seeking a zerocrossing SSR without using Microcontroller!
« on: November 30, 2019, 06:05:51 am »
Hello There,

Hope this post find you well.
May be or may not you would love it, because this issue has reached huge number of problems.
Someone could say "school project for infants".


I was trying to build a SOLID STATE RELAY with zero crossing switching.
Similar to this type http://demo5.zmpress.net/solid-state...ys-xssr-2402p2

In my case I was using MOC3021
[url=http://www.farnell.com/datasheets/97984.pdf]www.farnell.com/datasheets/97984.pdf[/url]
and BTA100-800A.
dv/dt of BTA100 is 500V/us.
My application is 380V 40A load switching.
Lets say for inductive and capacitive load.

Main issue is "someone said me not to use any microcontroller to drive the TRIAC gate".
So, random switch type SSR has been chosen,

It might be non-zero crossing type SSR. 5V dc as been used that does not make sense for gate switching or its keeping the gate ON always.

How about using a TIMER as follows?
881492-1" alt="" class="bbc_img" />

Can we control zero crossing with this idea?
I think I need a zero crossing detecting circuit, what do you think? Does it possible to use this circuit for zero current/ voltage crossing?
« Last Edit: November 30, 2019, 07:05:25 am by Md Mubdiul Hasan »
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Offline Md Mubdiul HasanTopic starter

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Re: Seeking a zerocrossing SSR without using Microcontroller!
« Reply #2 on: December 01, 2019, 05:19:26 am »
Thank you very much.
MOC3041 dv/dt is reasonable.
The MOC3021 does not have zerocrossing The MOC3041 has the same rating of the 3021 but it has zerocrossing  so does the MOC3081
The MOC3081 is 800 volt peak the 3041 is 400 volt peak they both have zero crossing circuit built in.

Hasan
 

Offline Md Mubdiul HasanTopic starter

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Re: Seeking a zerocrossing SSR without using Microcontroller!
« Reply #3 on: December 09, 2019, 01:17:45 am »
Just use the MOC3041 instead.
http://exa.unne.edu.ar/ingenieria/sysistemas/public_html/Archi_pdf/HojaDatos/Optoelectronica/moc3041.pdf

I need to be clear you few facts, my informations need to be modified.
The SSR is going to switch following type of Delta capacitive bank!
* c_delta_load.PNG (11.87 kB. 407x308 - viewed 110 times.)

It has ...

R.M.S Voltage = 440 VAC
Reactive Power, Q= 25kvr
RMS Current= 32.8A
Capacitor values= 342.53uF
Frequency=60Hz
Power factor= -0.4

I want to know with this higher power is there any problem with MOC308X+BTA100 resistor wattage ?
For 40A application, I will change bank capacitor.
« Last Edit: December 09, 2019, 05:21:02 am by Md Mubdiul Hasan »
Hasan
 


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