ZnO varistor

In the preparation of nanomaterials and nano-structure, there are many people in different ways.metal oxide varistor theory These methods may be divided according to the state of the reaction medium during the preparation of two categories: solution-based liquid phase reaction of gas phase reaction based on gas phase process. Growth by gas inorganic nano materials and nano-bodies have VLS mechanism main mechanism, VS mechanism, ZnO Resistors growth (OAG) mechanism, SLS mechanism. There is now a zinc oxide fine synthesis of nanostructures with different morphologies are pulsed laser deposition (PLD), chemical vapor deposition (CVD), metal organic chemical vapor deposition (MOCVD), chemical transport method (CTM),overvoltage arrester thermal evaporation, carbothermal reduction. Solvothermal, hydrothermal method.

Promotional Zinc Oxide Disc

In recent years, nano-materials due to its quantum size effect and macroscopic quantum tunneling, etc. ZnO varistorexhibit special optical, electrical, magnetic and catalytic properties, aroused great interest. After the zinc oxide and zinc sulfide nano materials, no doubt given on the basis of the original features of its range of new features, it will help to improve the material performance and functionality. In recent years, studies have shown that Zinc Oxide blocks and zinc sulfide nano-materials with ordinary zinc oxide and zinc sulfide compared to the bulk material, the mechanical properties, high temperature resistance, luminescence, catalysis and many other aspects have improved significantly. Zinc Oxide discsStudy on preparation and performance of materials science has become a very active area.

Zinc oxide varistors Features

TGE AC and DC High Performance MOV are widely used in electronic circuits, transient voltage surge protection because of the power supply system may harm the circuit. Varistor is generally used in parallel with the circuit when the voltage across the resistor changes rapidly, resistance short circuit current fuse blows, play a protective role. varistor metal oxide in the circuit, commonly used in the power supply voltage protection and regulation. Decrease the resistance of the TGE metal oxide varistor identification will be shunt currents, to protect against excessive transient voltage damage or interference.

Parallel applications of zinc oxide varistor

TGE metal oxide varistors application is a voltage limiting protection devices. Nonlinear characteristics of the use of zinc oxide varistors, when an overvoltage occurs between the two poles of the varistor, the varistor voltage can be clamped to a relatively fixed voltage value, in order to achieve protection of the post-stage circuit. Varistor TVS diode can be used instead tvs tube, a combination Zener diode and a capacitor.
Varistor circuit IC can be protected and other equipment, to prevent electrostatic discharge, surges and other transient current (such as lightning, etc.) and cause damage to them. Simply use varistors and connected to the protected IC or device circuit, when the transient voltage is higher than a certain value, the varistor resistance rapidly drops, turned a large current, thereby protecting the IC or appliances equipment; when the voltage drops below the operating voltage varistor, varistors high resistance, almost open, and thus will not affect the normal operation of the device or electrical equipment.
Zinc oxide varistor connected in parallel circuit generally used when the voltage across the resistor changes rapidly, resistance short circuit current fuse blows, play a protective role. Metal oxide varistors in the circuit, commonly used in the power supply voltage protection and regulation. Set the multimeter measurement 10k file, table pen connected to both ends of the resistor, the varistor should exhibit marked resistance multimeter, if you exceed this value is large, then the varistor has been damaged. Zinc oxide varistors and protected electrical equipment or components used in parallel. When the lightning over-voltage or transient operating voltage VS circuit occurs, varistors and protected equipment and components withstand VS, due to the fast response of the varistor, it exhibits excellent nanosecond time quickly non-linear electrical properties, then the voltage drop across the TGE Glass Coating varistors rapidly, far less than the VS, on such equipment and components to be protected actual withstand voltage is much lower than the over-voltage VS, so that the equipment and components for Free It was over-voltage shocks.

Zinc oxide varistors to protect the inverter application

 Lightning or lightning impulse voltage induced formation sometimes cause damage to the inverter. When the primary-side power supply system with vacuum circuit breakers, shunt opening and closing can also generate a higher voltage shocks. The drive side of the vacuum breaker opens once, formed by coupling the secondary side of high voltage surge spikes. To prevent over-voltage impulse voltage caused damage, usually at the input side of the inverter plus TGE metal oxide varistor application absorbing devices to ensure that the input voltage is not higher than the allowed maximum voltage during the inverter main circuit. When using the vacuum circuit breakers, the impact should be formed using an additional RC surge absorber. If the transformer primary vacuum circuit breakers, because to ensure the control timing before the first drive is disconnected vacuum circuit breakers.
Most factories are powered generator, or use the generator for a rainy day, when the generator has a fault, the output of the high-voltage inverter and electronic equipment often burned. This condition is often seen in our Shenzhen have had a wire drawing plant once it broke two dozen sets of 30KW inverter, discontinued ten days, causing heavy losses in the generator plant equipment to engage a lot of protection methods the effect is not obvious. Then join metal oxide varistor identification on the input of the inverter or instrument air switch, depending on the voltage 380V with a 821K, 220V with a 471K, so that when a high voltage varistor will be short-circuited, air switch trip, the protection of the inverter, Inverter failure rate is greatly reduced.
Note zinc oxide varistor must be connected to the output end of the air switch, parallel (three-phase triangular connection) wattage varistor size is not critical, a little input current is large is selected relatively large varistor or several varistors in parallel. When the TGE metal oxide varistor theory play a role in it will immediately complete a short circuit. Then switch also requires good air quality equipment, quick response and protect current is not too big.

The main characteristics of zinc oxide varistors and precautions

TGE mov metal oxide varistor is a zinc oxide as the main body, add a variety of metal oxides, various metal oxides classic electronic ceramics made classic electronic ceramics made of polycrystalline semiconductor ceramic element ʱ?? Because of its unique non-linear conductivity of polycrystalline semiconductor ceramic element.
 Because of its unique non-linear electrical conductivity and flow capacity, low voltage limit, fast response, Sobig and flow capacity, limiting low voltage, fast response, polarity, voltage and low temperature coefficient characteristics, widely used power, resistance, low voltage temperature coefficient, widely used in electric power, telecommunications, railways, telecommunications, chemical, petroleum and other areas set up communications facilities, railways, telecommunications, chemical, oil and other fields of facilities and equipment from momentary voltage surge damage. Prepare against momentary voltage surge damage.
 metal oxide varistor testing and protected electrical or components in parallel. When the circuit voltage surge does not appear, varistor surge work when the circuit voltage does not appear, varistors in pre-breakdown, the equivalent circuit for the grain boundary resistance is about the pre-breakdown region, etc. Validity circuit grain boundary resistance of about 10 1012 12 ~ 10 1013 13Ω / cm / cm, the varistor is high impedance, high impedance does not affect the varistor does not affect the normal operation of equipment to be protected; electric sound occurs when the circuit the normal operation of equipment to be protected; when the surge voltage circuit occurs, since the response speed is very varistor surge voltage, since the TGE varistor metal oxide fast response, it quickly turned nanosecond time.

Zinc oxide varistor of use

TGE metal oxide varistor basics is a non-polar overvoltage protection element, whether it is AC or DC circuits, simply TGE metal oxide varistor sizing and is to protect electrical equipment or components parallel protection device purpose