Automotive products of TGE metal oxide varistor symbol have become increasingly demanding, more and more attention because of the zinc oxide varistor has a good protective effect, good or bad quality can directly affect the use of the car, zinc oxide varistors and at the circuit input is broken, there is no impact on the normal circuit operation, when for some reason caused by the input voltage is increased to a certain value. varistor will burn to protect further damage to the circuit. (Varistor protection element one-off, so after the breakdown want to change with the type of new elements)
1. zinc oxide varistor structure like two characteristics consistent back-coupled regulator, which is basically the same nature. The main characteristics of the varistor, when the ends of the applied voltage is within the nominal rating, its resistance value is almost infinite, in a high impedance condition, the leakage current of <50 microamps, when the voltage across it slightly exceeded rated voltage, its resistance drops sharply immediately in the conduction status, the operating current increases several orders of magnitude, and the reaction time is only in nanoseconds. metal oxide varistor application in foreign commonly known as "chopper" and "limiter", which is from its practical effect and its name.
2. zinc oxide varistor in the circuit can absorb such counter electromotive force, thereby effectively protect the switching circuit from damage. In the car the most used appliances or car computer board in power protection circuit, TGE metal oxide varistor testing Toyota cars computer board with a sheet of black circle, while American cars and Daewoo cars in the pressure-sensitive computer board Most resistance is red, if the car alternator voltage regulator failure, resulting in long lines and battery voltage is too high or the battery pile loose, disengage and start using the power of the power to start the engine, often cause the computer board pressure sensitive resistor damaged.
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