One application is in cooling and heating control -
Temperature Control in Plastic Molding
It is more expensive than a relay. But is good for on-off time-cycling proportional control. The control circuits are here Analog Circuits. This is a DC Control AC Load SSR, This Solid state relay is the most popular and standard. The Motorola MOC3041 is a 5KV Opto-Isolated Zero-Cross Triac Driver, These circuits is based on such application notes. This was made by me in nice numbers for plastic and rubber molding machine, temperature controllers.
If you have a proportional controller and you need a 2-3
second cycle time, using relays is not good, they will not
last. Here SSR wins, with resistive heaters it will work very
Read about the
Zero-Crossing-Triac-Driver-MOC3041 an important part of
These can turn 230V AC equipment on and off. The output is
like a NO normally open contacts of a relay and have to be in
series with the Load like any other switch. This should not be
used for large inductive loads like big motors. The Q1
transistor limits the current thru the LED by providing an
alternate path for more current. The DC input can be from 3V
to 20V. The Triac can be chosen depending on current in the
10th Jun 2020
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