Power board packaging manufacturer: What is MOV varistor

Power board packaging manufacturer: what is MOV varistor

Power board packaging manufacturer: electronic components shuttle through our lives. Common varistors in household appliances include safety capacitors, varistors and high-voltage capacitors. I believe everyone is familiar with it. What is the function of the resistance of the rice cooker? Rheostat is an action element with abnormal voltage. Generally speaking, it is a very small and poor circuit design. To enter a parallel connection with a rheostat, it is necessary to connect a fuse (in front of the rheostat) in the power line. When the action voltage higher than the rheostat enters the power supply line, the action of the rheostat (short circuit between the rheostat and the power supply line) will blow the fuse, thus protecting the following things. The following series of varistor manufacturers will introduce MOV Varistor, I hope you can learn more about MOV varistor

Power board packaging manufacturer: MOV varistors are mainly used for surge protection of low-voltage apparatus, most of which are zinc oxide varistors. It is a polycrystalline semiconductor ceramic component made of zinc oxide as the main body, doped with various metal oxides and using typical electronic ceramic technology. The rheostat has a symmetrical ampere characteristic curve. The voltage and the current flowing through the MOV increase exponentially with the increase of the voltage at both ends of the MOV. In practical applications, MOV circuits are generally manufactured in parallel. When the circuit works normally, it is in a high resistance state, which does not affect the normal operation of the circuit. When abnormal transient overvoltage occurs in the circuit and reaches its conduction voltage (voltage sensitive induction voltage), the voltage sensitive resistor of MOV quickly changes from high resistance state to low resistance state, releases the transient overcurrent caused by abnormal transient overvoltage, and clamps the abnormal transient overvoltage within a safe level, thus protecting the subsequent circuit from the damage of abnormal transient overvoltage. MOV resistance has high instantaneous pulse absorption capacity and large capacitance, and is generally used for lightning protection of AC input terminal. Because the surge absorption capacity of the varistor depends on its physical size, different transient surge current values can be obtained by manufacturing varistors of different sizes

Power board packaging manufacturer: working principle of MOV varistor

Power board packaging manufacturer: MOV varistor principle: when added to MOV When the voltage on the varistor is lower than its threshold, the current flowing through it is very small, equivalent to a resistance with infinite resistance. In other words, when the voltage applied to it is lower than its threshold value, it is equivalent to a switch in the off state. When the voltage applied to the rheostat exceeds its threshold, the current flowing through the rheostat increases sharply, which is equivalent to a small resistance. In other words, when the voltage applied to it is higher than its threshold value, it is equivalent to a switch in a closed state. "Rheostat" is a kind of resistance device with nonlinear volt-ampere characteristics, which is mainly used for voltage clamping and absorbing excessive current to protect sensitive devices when the circuit is subjected to overvoltage. The resistance material of varistor is semiconductor, so it is all kinds of semiconductor resistance. MOV The varistor is a voltage limiting protection device. Using the nonlinear characteristics of the varistor, when overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thus realizing the protection of the subsequent circuit. Varistor is one of the most widely used voltage limiting devices. Varistors include silicon carbide varistors and zinc oxide varistors. The common zinc oxide (ZnO) rheostat is an overvoltage protection device made of zinc oxide as raw material, mixed, shaped and sintered with various trace metal oxides. Its outer surface is sealed with epoxy resin (pigment can be added)