Title :
An overvoltage, self-protected thyristor with high breakover power endurance
Author :
Shimizu, Yoshiteru ; Iyotani, Ryuji ; Yatsuo, Tsutomu ; Yokota, Yoshihiro
Author_Institution :
Hitachi Ltd., Ibaraki, Japan
fDate :
4/1/1991 12:00:00 AM
Abstract :
A high-resistance region was built in between the pilot thyristor and auxiliary thyristor. The built-in resistance had the ability to transfer the breakover power to the resistance region. Power dissipation in the device could be controlled by varying the built-in resistance. Using the built-in resistance, the breakover power endurance of a thyristor with a 5.5-kV breakover voltage could be increased by more than twice that of a device with no built-in resistance. The built-in resistance also functioned as a ballast resistor to make current spreading uniform. The voltage of the resistance region did not change for the two junction temperatures studied, 23°C and 100°C
Keywords :
electric resistance; overvoltage protection; thyristors; 5.5 kV; auxiliary thyristor; ballast resistor; built-in resistance; current spreading uniform; high breakover power endurance; high-resistance region; overvoltage; pilot thyristor; power dissipation control; self-protected thyristor; Circuit testing; Electronic ballasts; Power dissipation; Power electronics; Power system protection; Resistors; Silicon; Switches; Thyristors; Voltage control;
Journal_Title :
Electron Devices, IEEE Transactions on
