How VARISTOR Works In Simple Words with Examples

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ElectronicsClub

Published on Feb 17, 2022
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Due to its positive properties, the varistor is widely used in converter technology, in particular in pulse power supplies. The input part of the power supply is most susceptible to various types of pulses and interference coming from the network. The most dangerous of such interference are voltage surges, the amplitude of which significantly exceeds the amplitude voltage in the network. Such overvoltages can damage the electronic components of the circuit, for example, diodes, transistors, microcircuits, etc. The duration of such voltage surges usually does not exceed units and tens of microseconds, even one such insignificant in time interference can damage the equipment. To protect converters, power supplies and other devices, varistors are used. A varistor is a nonlinear resistance based on a semiconductor. The resistance of a varistor, unlike a conventional resistor, depends on the magnitude of the applied voltage. As the voltage increases, its resistance decreases. Moreover, the difference in resistance reaches a million times or more. In normal operation, the resistance is units and tens of megaohms, and when the varistor is triggered, its resistance drops sharply and is units and tens of ohms, that is, it is a jumper and short-circuits the input circuit of the device. The pulse energy is absorbed by the semiconductor resistor and dissipated as heat. If the varistor is unable to absorb the overvoltage energy, then it is insured by a series-connected fuse. 1. About the internal resistance of the power supply: • WHY DOES THE VOLTAGE SAG UNDER LOAD... 2. Why does the voltage in the network decrease: • Why does the voltage in the socket decrease #varistor # electronicsclub

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