The role of varistor?
Posted: admin Date：2022-01-26
The pressure sensitive resistance MOV is mainly applied to low-voltage electrical surge protection, which is mostly zinc oxide pressure sensitive resistance. It is a polycrystalline semiconductor ceramic component made of zinc oxide as a body, doped with a plurality of metal oxides, and a polycrystalline semiconductor ceramic element made of a typical electronic ceramic process. The pressure-sensitive resistor has a symmetrical voltammetric profile, and the current flowing through the MOV is increased in an index law with the increase of the voltage of both ends of the MOV. When in the actual application process, MOV is generally in parallel in the circuit. When the circuit is working properly, it is in a high resistance state, does not affect the normal operation of the circuit. When the circuit has an abnormal instantaneous overvoltage and reaches its conduction voltage (pressure sensitive voltage), the MOV rapidly changed from the high resistance state to a low-resistive state, leaking the instantaneous overcurrent caused by abnormal instantaneous excessive voltage while putting abnormal transients Overpushing clamps within a safe level, protecting the post-level circuit from abnormal transient overvoltage damage.
MOV has a high instantaneous pulse absorption capacity, large capacity, generally applied to AC AC input lightning protection protection. Since the surge absorption capacity of the pressure sensitive resistance depends on its physical dimensions, different transient surge current values can be obtained by manufacturing different size MOVs. The more pressure sensitive resistors currently applied on the market are: 05D series, 07D series, 10D series, 14D series, 20D series, 25D series, patch series. There are many types of pressure sensitive resistance in Dongwo supply, and the model is complete, and the sample can be applied to see how it is.