Automatic Power Switch 240V: Generator to Mains Transfer with Alarm & Circuit Calculations

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#1 21667710 20 Apr 2013 07:35

Adeyeye Jelil Adeyeye Jelil

Anonymous

Post #1
21667710 20 Apr 2013 07:35

Can someone help me construct an automatic power switch that can switch automatically from a generator set power supply to a government electric power supply with alarm system with its calculation?
Input power supply: 240V
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#2 21667711 20 Apr 2013 07:52

Eugene Lisovy Eugene Lisovy

Anonymous

Post #2
21667711 20 Apr 2013 07:52

To switch ON / switch OFF a load to ~240V -- use the Optocoupler + TRIAC classic schemotechnics (like into the attached picture but with the BTA24, BTA25, BTA26 or BTB24, BTB26).
Or use the ready to use Opto-TRIAC (like S201S06V).
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#3 21667712 20 Apr 2013 07:59

Eugene Lisovy Eugene Lisovy

Anonymous

Post #3
21667712 20 Apr 2013 07:59

Also useful CRYDOM's modules (see attached images).
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#4 21667713 22 Apr 2013 10:35

Adeyeye Jelil Adeyeye Jelil

Anonymous

Post #4
21667713 22 Apr 2013 10:35

Eug, can you specify the maximum voltage value that goes into optocoupler.
#5 21667714 23 Apr 2013 10:08

Eugene Lisovy Eugene Lisovy

Anonymous

Post #5
21667714 23 Apr 2013 10:08

See attached image.
This is classical using of optocoupler. D1 used like Zenner diode that take 0.7V on the LED inside the optocoupler.

So, switch on DC can be 0.7V up to high voltage.
Up to +24V the resistor's value of 330 Ohm is enough.

If input voltage is highest -- recalculate the value of R1:
http://www.calculatoredge.com/electronics/zener.htm

See also attached AN-3001.
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Automatic Power Switch 240V: Generator to Mains Transfer with Alarm & Circuit Calculations

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