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Structural characteristics and working principle of varistor

source:Industry News     Popular:adapter     release time:2022-05-09 10:53:47     Article author:yu    

Structural characteristics and working principle of varistor(图1)  

  The main features of the varistor are the wide operating voltage range (6~3000V, divided into several grades), fast response to overvoltage pulses (nanosecond level), strong impulse current resistance (100~2000A), and small leakage current ( Microampere level), small resistance temperature coefficient, high performance and low price, small size, it is an ideal protection component, which can constitute an overvoltage protection circuit, a noise elimination circuit, a spark elimination circuit, and an absorption circuit. When the overvoltage pulse is superimposed on the power supply network, after connecting the varistor, the overvoltage peak waveform is flattened and limited to a certain range. When the load circuit with inductive and capacitive load is turned on or off, there will be switching spikes in the DC waveform, and the varistor can absorb this back electric potential in the circuit, thereby effectively protecting the switching circuit from damage.

  The commonly used varistors include silicon carbide varistors and zinc oxide varistors. Among them, zinc oxide varistors are more widely used. It uses zinc oxide as the main raw material and adds a variety of trace metal oxides. A new type of ideal overvoltage protection device assembled by sintering, its conductivity value changes nonlinearly with the change of the applied voltage, it is called a varistor or a surge absorber.


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