氧化鋅壓敏電阻8/20μS脈沖電流下的伏安特性曲線分析

摘要：氧化鋅壓敏電阻器在8/20μS脈沖電流下的伏安特性曲線，在電流上升沿和和下降沿呈現(xiàn)不重合的回線特征。本文以壓敏陶瓷體在擊穿后的電流區(qū)以非線性電阻、晶粒電阻、等效電感和引出電阻相串聯(lián)的物理模型為基礎(chǔ)，提出陶瓷體等效電感、電極等效電感和引線電感共同構(gòu)成壓敏電阻的等效串聯(lián)電感，電極等效電阻和引線等效電阻共同構(gòu)成引出電阻，串聯(lián)電感形成回線特征。按照這一模型，用測(cè)量數(shù)據(jù)可以推算出不同電流點(diǎn)的串聯(lián)電感值，等效電感值是一個(gè)常數(shù)，并可推斷陶瓷體等效電感確實(shí)存在且為常數(shù)。可以確認(rèn)，除了引出電感（含引線電感和電極等效電感）外，伏安特性的回線特征是壓敏陶瓷體的本征特性。 敘詞：氧化鋅壓敏電阻 8/20μS脈沖電流下的伏安特性 壓敏陶瓷體等效電感 引出電感 引出電阻 回線特征 本征特性 Abstract：The Volt-ampere Characteristic Curve of ZnO Varistors under 8/20S impulse current shows that its rising process does not repeat its falling process. The article, based on the physical model series-wound by non-linear resistance, grain resistance, equivalent inductance and leading-out resistance, a current area following the breakdown of pressure-sensitive ceramic body, advances that ceramic equivalent inductance, polar equivalent inductance, and lead inductance comprise equivalent series-wound inductance of pressure-senstive resistance, polar equivalent resistance and lead equivalent resistance comprise lead-out resistance, series-wound inductance comprises loop wire characteristics. Based on the model, series-wound inductance values of different current spots can be measured, equivalent inducance value is invariable, and it also can be concludes that ceramic equivalent inductance can be invariable. It can be sure that besides lead-out inductance(including leading wire inductance and polar equivalent inductance, the loop wire characteristics of volt-ampere characteristics are intrinsic features of pressure-sensitive ceramic body. Keyword：ZnO Varistor, Volt-ampere characteristic under 8/20S impulse current, Equivalent inductance of pressure-sensitive ceramic body, Lead-out inductance, L