Equipment protection unit. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network
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The proposed scheme will protect radio equipment, for example, a radio station or a radio tape recorder, from failure due to accidental polarity reversal or an increase in supply voltage, which often happens when a generator in a car malfunctions.
The scheme of the device is shown in fig. 7.29.
With the correct polarity and rated voltage, the diode VD1 and the thyristor VS1 are closed, and the current through the fuse FU1 flows to the output of the device. If the polarity is reversed, the VD1 diode opens and the FU1 fuse blows. The HL1 lamp lights up, signaling an emergency connection. With the correct polarity, but the input voltage exceeding the set level, set by the zener diodes VD2 and VD3 (in this case, 16 V), the VS1 thyristor opens and short-circuits the circuit, which causes the fuse to blow and the emergency lamp HL1 to light up.
Fuse FU1 must be rated for the maximum current consumed by the radio equipment.
Author: Semyan A.P.
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