Title :
The reverse blocking GTO as a very fast turn-off thyristor
Author :
Tenconi, Sandro M. ; Zambelli, Mauro ; Malesani, Luigi ; Tenti, Paolo
Author_Institution :
Ansaldo S.p.A., Genova, Italy
Abstract :
The high-frequency operation of GTO´s (gate turn-off thyristors) in parallel inverters with resonant load for induction heating is investigated. The load-forced turn-off process of devices with reverse-blocking capability is analyzed on the basis of experimental results. The behavior of anode and gate voltages and currents during turn-off and during reapplication of forward voltage is analyzed considering various operating parameters (rate of decrease of anode current, rate of rise of anode voltage, reverse-bias amplitude and duration), and in particular gate-command timing. Appreciable benefits in terms of commutation losses, turn-off time, and snubber reduction are obtained as compared with the usual performance with chopper operation. Indications for an optimal gate-control strategy are also given
Keywords :
choppers (circuits); induction heating; invertors; thyristor applications; thyristors; anode; chopper operation; commutation losses; currents; forward voltage; gate; gate-command timing; high-frequency operation; induction heating; load-forced turn-off; operating parameters; optimal gate-control strategy; parallel inverters; performance; resonant load; reverse blocking GTO; snubber; very fast turn-off thyristor; voltages; Anodes; Circuits; Industry Applications Society; Resonance; Resonant inverters; Snubbers; Tail; Thyristors; Timing; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
