What are the characteristics of the pressure sensitive resistance and the application field of the pressure sensitive resistance? According to the small series of varistor professional understanding and ZnO varistors with excellent nonlinear characteristics, and waves Chung capacity, thus in the electrical and electronic fields are widely used in voltage protection, surge suppression. After nearly 40 years of development, the level of product technology, quality and application of the earth shaking changes have occurred. The performance and reliability of ZnO are greatly improved, and it is the most promising one. Zinc oxide varistor is a zinc oxide (ZnO) as the main material, add a variety of other trace elements, made of ceramic technology of compound semiconductor element and its basic characteristics are nonlinear current voltage relationship. When the add in the voltage across it below a threshold voltage (breakdown voltage), the resistance value with the voltage increased and decreased sharply, small to Ohm or milliohm level. This is due to the sharp change in resistance, and the emergence of a large current, when the voltage is removed, the pressure sensitive resistance and return to the original state, which is the principle of nonlinear formation. The volt ampere characteristics of varistor can be more than Zinc Oxide legend said.
Due to the characteristics of varistor is shown on the legend, this element is very suitable for absorption of lightning and operation of electrical system, and static electricity pulse generated by the impulse overvoltage and effectively protect a variety of electrical and electronic products, especially contains integrated circuit information and control technology products. Compared the impact of Zinc Oxide suppressor varistors and other types, there are many important features:
The varistor voltage range volts to thousands of volts, single chip
Impact current withstand voltage and impact ability
Limit voltage (residual voltage) low
Quick response (NS)
The I-V characteristics of positive and negative symmetrical
The following free flow
The long life
The number of different specifications (5D, 7D, 10D, 14D, 20D)
In the application domain
Transistor, IC, SCR and semiconductor switching devices and a variety of electronic, electrical equipment for overvoltage protection
The surge absorption and overvoltage protection of household appliances
Industrial electrical surge absorption
The electrostatic discharge and noise elimination
Surge relay and solenoid valve absorption
Overvoltage protection - electric leakage switch.
Lightning protection and overvoltage protection - telephone program-controlled switches and communication equipment
The above content is the characteristics of the pressure sensitive resistance and the application of the field of pressure sensitive resistance, read what you feel it? Is not a small series for you on a section of a professional electronic course.