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What is the role of the varistor in the power adapter, the charger manufacturer will share with you

source:Charger     Popular:adapter     release time:2021-07-10 16:06:34     Article author:sznbone    

  Varistor is a resistor whose resistance value changes with voltage within a certain range of current and voltage, or a resistor whose resistance value is sensitive to voltage, abbreviated as VDR. It is widely used in electronic circuits to prevent possible damage to the circuit due to transient voltage changes in the power supply system. It is also one of the important components of the power adapter. Today, the charger manufacturer will talk to you about the role of the varistor in the power adapter.

What is the role of the varistor in the power adapter, the charger manufacturer will share with you(图1)

  The main features of varistor are wide operating voltage range (6~3000V, divided into several files), fast response to overvoltage pulse (nanosecond level), strong resistance to impulse current (100~2000A), and low leakage current ( Micro-ampere class), with small resistance temperature coefficient, high performance and low price, and small size. It is an ideal protection component, which can form an overvoltage protection circuit, a noise elimination circuit, a spark elimination circuit, and an absorption circuit.

  When an over-voltage pulse is superimposed on the power supply network, after connecting the varistor, the over-voltage peak waveform is flattened and limited to a certain range. When opening or closing an inductive and capacitive load circuit, a switching spike appears in the DC waveform, and the varistor can absorb this back electromotive force in the circuit, thereby effectively protecting the switching circuit from damage

  Varistors can be used to replace the combination of transient suppression diodes, Zener diodes and capacitors. It also protects important components such as integrated circuits and other circuits and equipment to prevent damage to them caused by electrostatic discharge, surge and other transient currents (such as lightning strikes, etc.).

  When using, it is only necessary to connect the varistor to the protected circuit. When the voltage is higher than a certain value in an instant, the resistance of the varistor drops rapidly and conducts a large current to prevent instantaneous overvoltage and protect it. Function: 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.

  Although the varistor can protect the circuit, the energy or power it can withstand is limited and cannot provide continuous over-voltage protection. Continuous overvoltage will destroy the protective device (varistor), cause damage to the equipment, and may pose a fire hazard.


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