Title :
Polarization absorption currents and conduction response characteristics of zinc oxide varistors
Author :
Shengtao, Li ; Fuyi, Liu ; Haien, Bang
Author_Institution :
Dept. of Electr. Eng., Xi´´an Jiaotong Univ., China
Abstract :
The absorption currents and conduction response characteristics of zinc oxide varistors were measured with step voltage pulses of different amplitude, and a series resistance was used to stimulate the ZnO grain resistance of zinc oxide varistors. Based on an analysis of the experimental results, three kinds of absorption current were found, and an equivalent circuit describing the electrical properties of zinc oxide varistors was developed. It is deduced that conduction response time results from the equivalent capacitance of the grain boundary, and there is a close relation between the conduction delay phenomenon and the polarization absorption current. The larger the ZnO grain resistivity the shorter is the conduction response time
Keywords :
ceramics; electric current; electrical conductivity of crystalline semiconductors and insulators; equivalent circuits; grain boundaries; semiconductor materials; varistors; zinc compounds; ZnO grain resistivity; conduction delay phenomenon; conduction response characteristics; electrical properties; equivalent capacitance; equivalent circuit; grain boundary; grain resistance simulation; polarization absorption current; response time; step voltage pulses; Absorption; Current measurement; Delay; Electric resistance; Electrical resistance measurement; Optical polarization; Pulse measurements; Varistors; Voltage measurement; Zinc oxide;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172108
