LED indication in the key switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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Key switches with light indication are widely used in household and industrial electrical appliances for switching electrical loads of mains voltage. In these switches, the indicator circuit, connected in parallel with the load, is formed by a miniature glow discharge lamp (neon) with a current-limiting resistor (see Yushin A. Key switches with light indication. - Radio, 2005, No. 5, p. 52).
In key switches intended for switching lighting lamps, a similar circuit is connected in parallel with the contacts of the switch and the indicator lamp, on the contrary, shines when the load is off. These circuit solutions are extremely simple and extremely economical.
However, they also have a significant drawback. With the nominal resistance of the current-limiting resistor, the lamp life reaches several years of continuous operation, but the brightness of its glow in a number of practical applications is insufficient. You can increase the brightness by increasing the current through the lamp, but this sharply reduces its durability. Therefore, it is not uncommon to find a serviceable switch with a failed indicator.
Fig. 1
One way out of the situation is to replace a faulty neon lamp with an LED with an ordinary silicon diode connected in opposite parallel, as shown in the diagram in Fig. 1. As an example, consider the process of finalizing the popular Legrand key switch (Fig. 2)
Fig. 2
The procedure for removing a neon lamp and installing an LED in its place is illustrated in fig. 3. The decorative front panel is removed from the switch, and the indicator plug is removed from the rocker arm with an awl or a thin screwdriver. The lamp is pulled out with tweezers from the niche of the indicator plug and its terminals near the housing are bitten off with side cutters (Fig. 3, a).
Fig. 3
Further, a hole with a diameter of 3 mm is drilled in the center of the upper end of the plug, and an LED with shortened and bent ones is placed in the niche opposite the hole, as shown in Fig. 3,6, leads and with a diode soldered to them Instead of a remote lamp, the leads of the LED indicator are soldered to its remaining leads.
Mains voltage is applied to the pins of the plug and the brightness of the light indication is verified. It remains to push the LED deep into the niche of the plug so that it enters the prepared hole and its leads are hidden in the niche, after which the indicator is installed in the switch.
To preserve the color and brightness of the light indication with a current-limiting resistor of 390 kOhm in the Legrand power switch, I used an L-934SGC high-brightness green LED. Instead of KD102A, diodes KD102B, KD104A are suitable.
The process of finalizing the "Legrand" power switch with two keys is practically no different. LEDs in this case, you can choose a different color.
Author: E. Kondratiev
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