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VDR是英文Voltage Dependent Re-sistor的缩写。压敏电阻是电子元件中电阻器类特殊的敏感型电阻,是一种伏安特性为非线性的电阻元件。在电视接收机、计算机、通信等设备中作过压保护。压敏电阻类似于稳压二极管,它利用半导体材料的非线性伏安特性原理制成。但它具有双向限幅特性,其阻值的大小取决于两端所加的电压,当外加电压增至某一临界值时,阻值显著下降,伏安特性曲线如图1所示。
VDR is English Voltage Dependent Re-sistor acronym. Varistor is a kind of special sensitive resistor in electronic components, which is a kind of non-linear resistance element with volt-ampere characteristic. In television receivers, computers, communications and other equipment for over-voltage protection. Varistors, like the Zener diodes, make use of the non-linear volt-ampere characteristic of semiconductor materials. However, it has a bidirectional limiting characteristic. Its resistance value depends on the voltage applied at both ends. When the applied voltage increases to a certain critical value, the resistance decreases significantly. The volt-ampere characteristic curve is shown in FIG. 1.