A new concept, overvoltage self-protected thyristor

A new concept, overvoltage self-protected thyristor was theoretically analyzed and then fabricated. Its breakover operation is a combination of punchthrough and avalanche phenomena. Breakover voltage of the fabricated device is lowered several % at temperature from 20 to 125°C. This value corresponds to one third of that of the simple avalanche type device. Breakover power endurance of the device with 6kV breakover voltage amounts to several hundred kW. Compared with the simple avalanche type device, this newly developed device has twice the power endurance.