Light for a minute. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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In connection with the constant rise in the cost of utilities, including electricity, its economical use is also becoming relevant. Electric lighting in non-residential auxiliary premises (for example, in pantries, utility rooms, etc.) is most often required for a minute or two in order to take something you need from there or, conversely, put it in storage. But we often forget to turn off the light, and the light bulb continues to burn there unnecessarily, sometimes until the next visit to this room.
The proposed device is a time relay that turns on the light for 1 - 1,5 minutes, and then automatically extinguishes it.
The device is connected in parallel to the standard light switch (SA) and practically does not consume electricity in standby mode.
The figure shows the electrical circuit of the time relay. It contains: two transistors - VT1 and VT2 (KT315G), timing capacitor C1 and resistor R2, parametric stabilizer VD1 (KS168), optothyristor VS1 (TO125-12,5), control button SB1, two current-limiting resistors R1 and R3 and others.
The operation of the device is simple. At the moment it is first turned on with the button B1, the capacitor C1 is discharged, and therefore the charging current is supplied to the base of the composite emitter follower. Both transistors open. In the emitter circuit of the transistor VT2, the LED is turned on, which is located inside the optothyristor. The LED activates the turn on of the thyristor. The lamp lights up.
Schematic diagram of the time relay included in the lighting circuit of the auxiliary (non-residential) premises (click to enlarge)
Electric lamp with momentary light switch and two buttons with wires for a long utility room
After the time, determined by the values of the capacitance of the capacitor C1 and the resistance of the resistor R2, the transistors are closed. The light goes out. The light is switched on again by pressing the SB button a second time. The capacitor is discharging. The charge current passing through it opens the transistors again, and the optothyristor opens behind them. The light comes on again.
For ease of use, for example, in a long room there can be two or more control buttons SB.
For long-term illumination of the room, the standard SA switch is used, as usual.
Authors: Ya.Partin, L.Partina, Yekaterinburg
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