Halogens last longer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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It is known that the cold filament of lamps has an order of magnitude less resistance than when heated. The current at the moment of switching on reaches tens of amperes, which is approximately 10-15 times higher than the nominal value, which explains the probable failure of the lamps.
As the operation of lamps in the circuit proposed in [1] showed, in addition to reducing the brightness of their glow (i.e., in fact, nullifying the main advantage of halogen lamps), there is one more drawback: significant power is dissipated on the control transistor, which requires its installation on the radiator. These shortcomings are partially eliminated in the scheme proposed in [2], but even here there are some inconveniences: it is necessary to use two deficient relays to switch the high and low beams.
The proposed scheme does not contain scarce parts and is easily placed in the cases of relays already in the car, and, most importantly, does not require intervention in the electrical circuit of the car.
The preheating of the lamps is carried out through the resistance R1 and the thyristor VD2. The R4C1 circuit with a time constant of 150 ms determines the delay time for turning on the relay for more than 50 ms (the time for charging the capacitor C1 to a voltage of about 6 V), which is quite enough to heat up the lamp filaments. In this case, the "shock" of the current does not exceed the nominal value for the operating state of the lamps.
All parts, except for the thyristor VD2 and resistor R1, are placed in the relay case 1133747, used in cars BA32105, 2107 ... 2109. Transistor VT1 type KT815 can be used with any letter. Zener diode type KS 156 can be replaced by KS147. Capacitor C1 - type K50-35. The threaded output of the thyristor type KU201 (or KU202 with any letter) is shortened to 1 mm and soldered to the outside of the relay cover through a drilled hole. The resistance R1 is made of nichrome wire and placed around the thyristor, having previously put a fluoroplastic tube on it.
References:
- V. Bannikov. "To make the lamps last longer." "Behind the wheel", 6/91
- Car Club. "Extend the life of the lamps" - "Behind the wheel", 1/92
Authors: A.Petrov, A.Menko
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