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TIMER SELF-POWERED 230V TRIAC

TIMER SELF-POWERED 230V TRIAC

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  IDEA ELECTRONIC PROJECT

In many cases, the problem that usually arises is to install a timer in place and instead of an existing switch, that is to say a place where you only have two phases of the sector.


I - THE PRINCIPLE
The trick is to get on the power circuit of the bulb to control a dropping resistor of low value across which collected a few volts of alternating voltage. After recovery of the two alternations one has the direct potential required to operate the electronic assembly. The latter is reduced to a large capacity and counter based on adjustable-The end time of the timer is operated to cut off the supply to the lamp and therefore the self-supply of the timer. Two systems are available for controlling the supply of the bulb:
- The miniature relay.
This module has the advantage of completely isolate the control circuit of the power circuit. Small dimensions this circuit can be housed under the covers, in sealed boxes in plaster and intended to contain a conventional switch.

II - OPERATION

The red LED which the current is limited by resistance indicates that the installation is on.
To start the timer, simply press the push button which shunts or the relay contacts. At that time, food stands and self-maintained. She cut to the end of the timeout.
If the controlled power was more important, for example two bulbs 100 W.

timer
The integrated circuit IC is a CD 4060. It is a binary counter of fourteen floors with built-in oscillator.
At the time of power assembly, the capacitor C2 is charged through R3, which results in a positive pulse on the reset input. The counter is thus automatically reset to zero.

Use of an opto-triac
The transistor T supplies its collector infrared transmitting diode of an opto-TNAC, via a limiting resistor R4. This is a JI 3021. As soon as the infrared emission occurs, the opto-triac turns on. In particular, it allows the establishment of a current between the cathode and the gate of power TNAC through the resistance R2 Power is well established until the end of the timeout, as in the previous assembly.

III - THE REALIZATION

The Printed Circuit
Track configuration is not tightened. PCB copper epoxy. After etching in a bath of ferric chloride, all pellets will be drilled using a drill of 0.8 mm diameter. Some will expand to accommodate the diameter of the connections of larger components such as adjustable, the electrolytic capacity or terminal block.

The component layout
First, we will implement the resistances, supports Cl, capabilities and transistor. It will eventually adjustable, the rectifier bridge, the pushbutton, the LED, the relay or triac and the terminal block. The push button occupies the geometric center of the modules. One can thus use the plastic cover of a television antenna PNSE in which it is sufficient to adapt the central hole in the right diameter to allow the passage button. A second hole is to run for the signaling LED.

NOMENCLATURE

R1 : 10R / 3 W (bobinée)
R2 : 1 K (marron, noir, rouge)
R3 : 33 KR (orange, orange, orange)
R4 : 1 MR (marron, noir, vert)
R5 : 10 KR (marron, noir, orange)
R6 : 3,3 kR (orange, orange, rouge)
A : ajustable 220KR Horizontal
Pont de diodes 1,5 A 
D : diode 1N4004 
L : LED rouge 3mm 
C1 : 1 000 MF/16V électrolytique
C2 : 22 MF/16 V électrolytique 
C3 :0,1 MKT
T : transistor PNP 2N2907 
IC : CD 4060 
Support 16 brocbes 
Relais 5 V/1 RT 
Bouton-poussoir (pour circuit im­primé) 
Bornier soudable 2 plots

NOMENCLATURE

R1 : 10R /3 W (bobinée) 
R2 : 3,3 KR (orange, orange, rouge)
R3 : 1 KR (marron, noir, rouge) 
R4 : 470 R, (jaune, violet, marron) 
R5 : 3,3 KR (orange, orange, rouge)
R6 : 1 MR (marron, noir, vert) 
R7 : 10 KR (marron, noir, orange) 
R8 : 33 KR (orange, orange, orange)
A : ajustable 220 KR, Hoizontal
Pont de diodes 1,5 A 
L : LED rouge 3mm
C1 : 1 000 MF/16V électrolyti­que
C2 .0,1 MF MKT
C3 : 22 MF/16 V électrolytique 
T: transistor PNP 2N2907 
IC1 : opto-triac MOC 3021 
IC2 : CD 4060 
1 support 6 broches 
1 support 16 broches Bouton-poussoir (pour circuit im­primé) 
TR : triac 
Bornier soudable 2 plots

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