V150LC20BPX10

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TVS (transient voltage suppressor), MOV (metal oxide varistor) and Varistors are commonly used in various types of electronic applications for the same purpose of providing protection for circuit components against transient voltage surges. This article will focus on the application field and working principle of the V150LC20BPX10, a popular metal oxide varistor.

The V150LC20BPX10 is a metal oxide varistor made from the combination of zinc oxide and other metals such as cobalt, manganese, iron, and nickel. It has a stand off voltage of 20V and a maximum peak current rating of 150A. This varistor is designed to clamp and absorb over-voltage spikes caused by electrostatic discharge (ESD), lightning, and induced current due to switching of other electrical loads. This metal oxide varistor is typically used in consumer electronic applications such as TVs, radios, and personal computers, as well as industrial control systems, telecommunications, power supplies, and solar inverters which require surge protection.

The working principle of the V150LC20BPX10 begins with electrical power, typically AC voltages, flowing through the circuit until a point of reference (clamping voltage) is reached. This is usually determined by a capacitor, resistor, inductor, or zener diode. When the voltage reaches the reference point, the varistor begins to conduct electricity and reduce the peak current between the two ends of the varistor, thus protecting the components from damage due to excessive current or voltage.

In order to understand the working principle of a varistor, the first thing to consider is how the voltage of a varistor changes with current. A varistor’s resistance, or impedance, is inversely proportional to the current through the varistor. This means that a higher current will result in a lower resistance, and a lower resistance will result in a higher current. In other words, the higher the current, the lower the resistance and vice versa.

The second key element in understanding the working principle of a varistor is its voltage-current characteristics. As the voltage across the varistor increases, the current through the varistor increases in a non-linear fashion. This means that as the voltage increases, the current will start to increase rapidly until it reaches the maximum allowable peak current rating of the varistor. After this point is reached, the current will then begin to fall back down and asymptotically approach zero while the voltage rises higher.

Finally, the third key element in understanding the working principle of a varistor is its breakdown voltage. The breakdown voltage is the voltage at which the varistor begins to conduct electricity and reduce the peak current between the two ends of the varistor. Once the breakdown voltage is reached, the varistor will begin to conduct electricity and will remain in a conductive state until the voltage falls back below the breakdown voltage.

In summary, the working principle of the V150LC20BPX10 can be understood by examining its voltage-current characteristics. The breakdown voltage is the voltage at which the varistor begins to conduct electricity and reduce the peak current between the two ends of the varistor. The higher the current, the lower the resistance and vice versa. The varistor is typically used in consumer electronics applications such as TVs, radios, and personal computers, as well as industrial control systems, telecommunications, power supplies, and solar inverters which require surge protection.

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