Lamp soft start indicator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Lamp soft start indicator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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The soft turn indicator (IMV) is designed to improve the consumer properties of wall rocker switches and to save the working life of incandescent lamps. IMV provides an economical (50% power) mode of operation of the lamps and their "soft" (two-stage) switching on to increase the service life.

Lamp soft start indicator

In an unlit room, the glow of the HL2 LED indicates the location of the SA1 key of the two-gang switch, which should be pressed to turn on the economy mode. The same key should be pressed first for a soft start, and after 0,1 ... 0,5 s - SA2 (normal mode. 100% power). The green glow of the two-color LED HL2 indicates the economical mode of operation of the HL1 lamp.

As you know, the filaments of incandescent lamps in a cold state have low resistance. Therefore, when the lamps are turned on, until they are warmed up and their resistance has not increased, a surge of current is observed, which is 8 ... 10 times the rated current of the lamp. Such a "starting" overload leads to the gradual destruction of the filaments, and the lamps most often burn out when they are turned on.

IMV allows you to increase the lamp life by 3 ... 10 times if the correct switching sequence is followed. First, you need to close the SA1 key (in this case, the indicator color changes from red to green), and after 0,1 ... 0,5 s - SA2 (in this case, the indicator goes out).

In the initial (open) state of SA1 and SA2, the HL2 indicator glows red, since alternating current flows through the elements HL1.R1 and HL2. The "green" part of HL2 also radiates, but due to the greater brightness of the "red" part, the green tint is almost imperceptible. The current flowing through the HL1-R1-HL2 circuit is incomparably small in relation to the operating current HL1, so the lamp does not glow.

When SA1 is closed, the positive half-waves of the mains voltage through the diode VD1 are fed to the lamp HL1, and it glows half-heartedly. Closing contacts 5A1 shunts the "red" part of the LED HL2. and it changes the glow color from red to green. If you do not need an economy mode, press SA2. The HL1 lamp glows at full incandescence, since both half-waves of the mains voltage now flow through it. and the HL2 indicator is shunted by closed SA2 contacts and goes out.

The IMV uses an OMLT-2 W resistor, a two-gang wall switch of any design (suitable with a combined common contact), designed for mains voltage (220 V). The two-color LED indicator KIPD41A can be replaced by a foreign L-15VE6W. Diode VD1 is replaced by others, for example, D226V. KD105B. KD205A. When using an incandescent lamp with a power of 1 W or more as HL100, diodes KD226V or KD202K (M. R) should be used.

R1 elements. HL2. VD1 are installed in the circuit breaker housing. To increase the mechanical strength of the circuit, the connection point R1 and HL2 is recommended to be soldered on the mounting tab.

With the value of the resistor R1 indicated on the diagram, its power load factor is only 0,17. This margin is necessary for minimal heating of the device. You can increase the brightness of the indicator by reducing the resistance of the resistor by half, but at the same time, it is advisable to drill several ventilation holes with a diameter of 1.5 ... 2,5 mm in the cover of the switch from below and from above.

Author: A. Oznobikhin, Irkutsk

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