壓敏防雷芯片(MOV)最大熱穩(wěn)定電壓的研究

摘要：本文就不同電壓梯度對(duì)MOV最大熱穩(wěn)定電壓的影響進(jìn)行了試驗(yàn)。測(cè)試結(jié)果表明：配方體系MOV在電壓梯度為160V/mm～170V/mm時(shí)的熱穩(wěn)定電壓最高；170V/mm梯度的樣品加載最大熱穩(wěn)定電壓0.79U1mA 作用約15min，其表面溫度升到最高且能夠穩(wěn)定，當(dāng)加載電壓為0.80U1mA時(shí)，MOV的表面溫度不斷上升，最終導(dǎo)致熱擊穿。 敘詞：ZnO壓敏電阻 熱穩(wěn)定電壓 工頻過(guò)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