壓敏防雷芯片(MOV)最大熱穩定電壓的研究

摘要：本文就不同電壓梯度對MOV最大熱穩定電壓的影響進行了試驗。測試結果表明：配方體系MOV在電壓梯度為160V/mm～170V/mm時的熱穩定電壓最高；170V/mm梯度的樣品加載最大熱穩定電壓0.79U1mA 作用約15min，其表面溫度升到最高且能夠穩定，當加載電壓為0.80U1mA時，MOV的表面溫度不斷上升，最終導致熱擊穿。 敘詞：ZnO壓敏電阻 熱穩定電壓 工頻過電壓耐受 Abstract：The paper examines the effect of different voltages toward maximal thermostable voltage of MOV. Results show that the thermostable voltage of recipe-stytem MOV is highest when voltage grads are from 160V/mm to 170V/mm; Under 170V/mm grade, when the sample is loaded with maximal thermostable voltage 0.79U1mA and lasts for 15 min, the surface temperature reaches the highest and keeps stable; when the loaded voltage is 0.80U1mA, surface temperature keeps rising and results in thermal runaway.　 Keyword：ZnO Peizoresistance, Thermostable voltage, Power overvoltage tolerance