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In this Discussion
- jeremydouglass March 2018
- koogs March 2018
How to control the Triac with the MOC3062SM optocoupler?
Loads: Some baseboard heaters (1500W max, some motors, 12A max).
I only have some theoretical knowledge about optocoulers from here: apogeeweb.net/article/69.html. I have no experience using Triacs and optocouplers.
Triac: T3035H-6T, Datasheet: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00263568.pdf
Optocoupler: MOC3062SM, Datasheet: http://www.mouser.com/ds/2/149/MOC3062M-196063.pdf
Optocoupler is driven by a 5V micro controller output which will be on as long as the load needs to be on.
I am planning to control the Triac with the MOC3062SM optocoupler, and would like your comments on the example circuit in the datasheet (Basic Applications).
I am uncertain about how to dimension (watt) the two 360 ohm resistors on the 240VAC load example.
I mean, if the optocoupler triac is conducting as long as LED is on, then 1/3A is flowing in the resistors, and producing a cozy 80W. So I guess I am not understanding the workings of the optocoupler, as I cannot believe we need to dissipate that kind of heat.
I just realized the 1/3A is just momentary, the load takes the bulk of the voltage as soon as the triac fires...
Or does the optocoupler switch off a certain number of degrees into the cycle?
Your input will be appreciated.
Answers
this is probably the wrong forum for this.
this is a forum for proceessing.org software, not random bits of hardware.
@lingyueqing -- You might try searching related questions on the electronics stackexchange or (if appropriate) Arduino forums.