Anti-theft device. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Security devices and alarms
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Unlike well-known industrial and amateur anti-theft devices, this design does not have a single mechanical contact and a hidden toggle switch, it is simple, reliable and durable. It is an electronic ground switch. As practice suggests, for the purpose of fire safety, even with short-term parking of the car, it is advisable to disconnect the on-board network from the battery.
The device consists of only three parts: a thyristor VS1, a diode VD1 and a reed switch SF1 (Fig. 1). The thyristor VS1 acts as an electromagnetic relay that is triggered even if there is a short pulse on the control electrode. Such a signal is given when the reed switch SF1, installed in the passenger compartment, is closed. The thyristor opens, its resistance decreases sharply, and the battery terminal "-" is connected to the "ground".
The thyristor passes current in only one direction - from the battery to the on-board network. So that the battery can be recharged from the generator, a VD1 diode is connected in parallel with the thyristor in reverse polarity.
When the ignition is turned off or the engine is turned off, the device enters the "anti-theft" mode. They place the device under the hood in a hard-to-reach place so that it does not catch the eye of an outsider or an intruder. In the thyristor case, it is desirable to make a hole for the M8 bolt for the terminal blocks (Fig. 2). The SF1 reed switch is installed discreetly in the cabin - on a plastic decorative panel or in any other place. The reed switch magnet is kept by the driver.
The described device was installed in the car "FORD ESCORT" and has been effectively operated for more than two years.
Author: V. Rezkov, Vitebsk; Publication: N. Bolshakov, rf.atnn.ru
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