The varistor is used for the efficiency of the circuit

Protection function of varistor:

1. Surge suppression type: refers to a varistor used to suppress transient overvoltages such as lightning overvoltage and operating overvoltage. The occurrence of transient overvoltage is random, non-periodic, peak of current and voltage. It may be very big. Most varistors fall into this category.

2. High-power type: refers to the varistor used to absorb the continuous pulse group appearing in the cycle, such as the varistor connected to the switching power converter, where the impulse voltage cycle occurs, and the period is known, the energy value is generally It can be calculated that the peak value of the voltage is not large, but because of the high frequency, the average power is quite large.

3. High-energy type: refers to the varistor voltage used to absorb the magnetic energy in the large-scale induction coils such as the generator excitation coil and the lifting electromagnet coil. For this type of application, the main technical index is the energy absorption capability.

The protection function of the varistor can be repeated many times in most applications, but it is sometimes made into a "disposable" protection device like a current fuse. For example, a short-circuit contact varistor connected in parallel to some current transformer load. You can learn about editing the above before using it.

Varistor for circuit efficiency:

Varistors are mainly used for transient over-voltage protection, but similar to the volt-ampere characteristics of semiconductor regulators, it also has a variety of circuit component functions, such as:

1. DC high voltage and small current regulator components, the stable voltage can be up to several thousand volts, which is not possible with silicon regulators.

2. Voltage fluctuation detection component.

3. DC battery shifting element.

4. Pressure equalizing components.

5. Fluorescent starter element.