Protection of radio equipment from increased voltage in the network. 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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Most modern radio equipment has switching power supplies, which fail in the event of an overload. Constantly monitoring the mains voltage is inconvenient, and inefficient. After all, an overload with a working radio equipment can occur at any time. The proposed device allows you to prevent damage to electrical appliances and radio equipment from high voltage.
The simplest option for protecting equipment from overload can be performed using a special arrester, connected after the input fuses. It has such a characteristic that gas breakdown inside the housing occurs when the operating voltage exceeds 270 V.
A triggered spark gap has a very low internal resistance and short-circuits the mains circuit. In this case, the fusible links will simply burn out (or the protective electromechanical machine will work), which will interrupt the power supply to all household appliances that are turned on.
The main disadvantages of the arrester are its scarcity and unregulated response threshold. The above diagram (Fig. 7.22) is similar in principle to the arrester. Only instead of it, a more affordable electronic switch was used - a triac. In this case, the opening threshold VS1 can be set using the resistor R4 at the level of 260 V (effective value).
Capacitor C1 eliminates the operation of the circuit from short-term interference (emissions). It is not necessary to install the HL1 LED, but it is convenient to have it when setting up, when the triac control can be temporarily disabled.
Author: Semyan A.P.
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