What is the component of MOV in switching power supply?
In many cases should not be directly used in the protection of high frequency signal line, used in the protection circuit in communication, because of its larger capacitance increase in leakage current, give full consideration to the needs in the design of protection circuit. The varistor flow capacity is larger, but the ratio of the gas discharge tube.
The response time of the varistor is ns grade, faster than the air tube, tube slightly slower than TVS, electronic circuit for overvoltage protection of the response speed can meet the requirements under normal circumstances. The junction capacitance varistors in hundreds to thousands of Pf magnitude range,
Varistor is a voltage limiting type protection device. Using the nonlinear characteristics of varistor, when overvoltage appears in varistor between the poles, the varistor voltage can be clamped to a fixed voltage value, so as to realize the protection of the circuit. The main parameters of varistor varistor voltage: and the current capacity, junction capacitance and response time.
