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The role of varistor in switching power supply

source:Industry News     Popular:adapter     release time:2022-05-09 10:53:26     Article author:yu    

  The role of varistor in switching power supply(图1)

  Varistor is a component with transient voltage suppression function, generally used in surge and transient protection circuits of switching power supply circuits, and can be used to replace the combination of transient suppression diodes, zener diodes and capacitors . Varistors protect important components such as integrated circuits and other circuits and equipment from damage caused by electrostatic discharge, surges, and other transient currents such as lightning strikes. When using, only need to connect the varistor in parallel to the protected circuit. When the voltage is momentarily higher than a certain value, the resistance of the varistor drops rapidly, conducts a large current, and prevents instantaneous overvoltage for protection. When the voltage is lower than the working voltage of the varistor, the resistance of the varistor is extremely high, almost open circuit, so it will not affect the normal operation of the device or electrical equipment.

  A varistor (Voltaga Sensor Resistor, VSR) is a new type of overvoltage protection component. The varistor is a metal-oxide-semiconductor ceramic component made of zinc oxide as the main material. The core material of the varistor is zinc oxide, which includes zinc oxide grains and the grain boundary layer around the grains. The resistivity of zinc oxide grains is very low, while the resistivity of the grain boundary layer is very high. A potential barrier equivalent to a Zener diode is formed between the two grains in contact, becoming a varistor unit, and many units The varistor substrate is formed by series and parallel connection. When the varistor is working, each varistor unit bears the surge energy, and these varistor units are generally evenly distributed in the entire resistor body, and the entire resistor body bears the energy, unlike the Zener secondary stabilizer. Like the pressure tube, only the junction area bears the electric power, and its resistance changes with the change of the terminal voltage.


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