Definition of Metal oxide varistors

Metal oxide varistors is a voltage limiting protection devices. Utilizing nonlinear characteristics Metal oxide varistors, when an overvoltage occurs between the two poles of the metal oxide varistors application, the metal oxide varistors application voltage can be clamped to a relatively fixed voltage value, in order to achieve protection of the post-stage circuit. The main parameters of Metal Oxide Varistors (MOV)s are: Metal Oxide Varistors (MOV) voltage, flow capacity, junction capacitance and response time.Metal Oxide Varistors (MOV) response time is ns level, faster than the air discharge, slightly slower than the TVS tube, generally used in electronic circuit overvoltage protection response speed to meet the requirements. When the junction capacitance Metal Oxide Varistors (MOV) is generally on the order of hundreds to thousands of Pf range, and in many cases should not be applied directly to the protection of high-frequency signal lines, the application of the AC circuit protection, as it will greatly increase the drain junction capacitance current protection circuit is designed to take full account. Metal Oxide Varistors (MOV) flow capacity is large, but smaller than the gas discharge tube.
mov metal oxide varistor referred VSR, it is a kind of non-linear voltage-sensitive semiconductor overvoltage protection device. It is used in the circuit text symbol "RV" or "R" represents, the picture is the circuit graphic symbols.
"mov metal oxide varistor" is a noun in mainland China, meaning "within a certain range of the resistance value of the current and voltage with the voltage change," or that "the resistance value of the voltage-sensitive" resistor. mov metal oxide varistor resistive material is a semiconductor, so it is a variety of semiconductor resistor. Now extensive use of "zinc oxide" varistor, its main material of divalent element and hexavalent elemental oxygen posed. So from a material point of view, the zinc oxide varistor is a kind of "Ⅱ-Ⅵ family-oxide semiconductor."
In China Taiwan, varistors are named according to their use, known as the "surge absorber." Varistor according to their use is sometimes also referred to as "electric shocks (surge) suppressor (absorber)."

metal oxide varistors application

Traditional Metal oxide varistors schematic symbol. It expresses the diode-like behavior in both directions of current flow.
Modern varistor schematic symbol.
A metal oxide varistors application is an electronic component with an electrical resistance that varies with the applied voltage. Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non-ohmic current–voltage characteristic that is similar to that of a diode. In contrast to a diode however, it has the same characteristic for both directions of traversing current. At low voltage it has a high electrical resistance which decreases as the voltage is raised.

Varistors are used as control or compensation elements in circuits either to provide optimal operating conditions or to protect against excessive transient voltages. When used as protection devices, they shunt the current created by the excessive voltage away from sensitive components when triggered.
The development of the varistor, in the form of a new type of rectifier (copper oxide), originated in the work by L.O. Grondahl and P.H. Geiger in 1927. The name varistor is a portmanteau of varying resistor. The term is only used for non-ohmic varying resistors. Variable resistors, such as the potentiometer and the rheostat, have ohmic characteristics.

the introduction of metal oxide varistors application

Traditional Metal oxide varistors schematic symbol. It expresses the diode-like behavior in both directions of current flow.
Modern varistor schematic symbol.
A metal oxide varistors application is an electronic component with an electrical resistance that varies with the applied voltage. Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non-ohmic current–voltage characteristic that is similar to that of a diode. In contrast to a diode however, it has the same characteristic for both directions of traversing current. At low voltage it has a high electrical resistance which decreases as the voltage is raised.

Varistors are used as control or compensation elements in circuits either to provide optimal operating conditions or to protect against excessive transient voltages. When used as protection devices, they shunt the current created by the excessive voltage away from sensitive components when triggered.
The development of the varistor, in the form of a new type of rectifier (copper oxide), originated in the work by L.O. Grondahl and P.H. Geiger in 1927. The name varistor is a portmanteau of varying resistor. The term is only used for non-ohmic varying resistors. Variable resistors, such as the potentiometer and the rheostat, have ohmic characteristics.

High Performance Varistor

High Performance Varistor and surge arrester varistor high performance requirements, system studies functional powder type, size, density, surface condition, surface treatment, surface area and powder activity of the influence of the resistance performance, success develop efficient varistor composite particles.
Second, the specific description:
1. Application: metal oxide varistors and surge arresters manufacturing enterprises.
2, the technical indicators: application to high-performance anti-corona resistance, surge voltage insulation coating material, its performance over similar foreign products; applied to large current insulating coating material, such as zinc oxide insulating layer side valve D3 with ordinary Composite arrester valve side insulation coating compared to the 4 / 10μs standard indicators of the impact of high current 65 ~ 70kA, more than GB11032-2000 standard (45kA), and reached the international IEC-60099-4 standard (65kA).

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