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Project

AC Dimmer, 230V

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Author: dany

Last Updated: 2016-02-18

Package Version: 1.0.0.0

Category: Power supply

Downloaded: 1686 times

Followed by: 3 users

License: MIT license  

Simple galvanic isolated dimmer (with triac phase control) for 230V AC.

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Project Blog

This is a very simple dimmer with a triac output (phase control). It uses timer0 to do the timing.


The control part (here a P12F629) is competely isolated from the 230V mains supply:
- the zero crossing detector contains an optocoupler (4N25 or similar),
- the drive of the triac also contains an opto coupler (MOC3025 or similar). Be aware: the latter optocoupler should NOT have a zero cross detection!

The 5V power supply is not drawn in the schematic.

The ignition angle can be set in the example by setting the value of Tmr0 at the end of the zero crossing detection. The example uses only these 3 values, see the comments below:

     Case Step of
        0: Tmr0 := 0;   // never ignite triac (delay > 10 ms)
        1: Tmr0 := 140; // low value = long delay = late ignition = low power
        2: Tmr0 := 175; // average power
        3: Tmr0 := 250; // high value = short delay = high power
      end;

Dimmer

Dimmer

Schematic diagram

View full image

The 230V mains is connected between pins 1 and 2 of the connector, the load (e.g. an incandescent lamp) is connected between pins 3 and 4.

2015-10-10: the circuit diagram has been adapted to the correct (with galvanic separation between the grid and the PIC) one.

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