Diode bridge for an electric lamp. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Lighting
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Often one hears reproaches about the premature burnout of electric lamps. And although they are mostly fair, I am not going to join the pessimists. After all, the solution to this technical problem can be found even in a home workshop.
In particular, I turn on my electric lamps in the kitchen, in the corridor, in the pantry and in the bathroom not directly, but through diode voltage converters. I was convinced that the service life of light sources during such operation increases many, many times, since the reliability of the lamp increases mainly due to the under-draining of the tungsten spiral when a "half-wave" current passes through it.
To embed an economy diode in an electrical circuit, free niches of switches, special adapters, and even the lamp base itself are usually used. But in all these options, semiconductor valves are required, designed for the maximum forward current I max and the maximum reverse voltage Uobr.max. Hence the difficulty.
So, a low-power diode D226B works great in tandem with a 60-watt lamp. But he obviously "does not pull" when a 100 W lamp is screwed into the socket. This means that a medium-power semiconductor valve is needed, but it costs more than any D226.
I offer my own version using a ready-made semiconductor assembly - a diode bridge, which has at least one shoulder in good order. For example, the widely used one-ampere KTs402A, KTs402B, KTs402V, KTs402G and KTs402D with Uobr.max 500, 400, 300, 200 and 100 V, respectively, are well suited for these purposes.
In size, the diode bridge is slightly smaller than the terminal block and it is easy to find additional space for its embedding. You can hide everything in a cap that hides the lamp suspension hook.
With such a connection, any incandescent lamp does not burn out for a long time even in the most unstable electrical network (insulation in the form of a PVC tube is conventionally not shown): 1 - cartridge with a lamp; 2 - "chandelier" terminal block; 3 - diode bridge of the KTs402 series in the case; 4 - mounting wires
To install a semiconductor "limiter-economy" it is necessary to solder to the pins of a serviceable bridge shoulder along a piece of copper wire 50-100 mm long and 1,5 mm2 in cross section. Put PVC tubes on them (to avoid accidental short circuits) and connect them to the terminal block on one side, and on the other, connect the neutral wire and any of the two terminals of the electric socket with the lamp.
The remaining output of the electric cartridge must be connected to the wire from the switch and insulated this place. If a twisted connection is undesirable (especially when electrically corrosive pairs of the copper-aluminum type are in contact), then a typical "chandelier" block with three terminals is more acceptable.
Of course, in any case, installation is carried out only with a de-energized network!
Author: V.Vozniak
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