Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1995-12-21
1997-11-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
327442, 327443, H03K 1772
Patent
active
056844263
ABSTRACT:
A GTO gate driver circuit includes a GTO; a MOS gate driver; a turn-on rectifier for receiving power from a high voltage isolation transformer; a turn-on capacitor coupled in parallel with the turn-on rectifier; and a turn-on MOSFET having a drain coupled to a first side of the turn-on capacitor, a gate coupled to the MOS gate driver, and a source coupled to a gate of the GTO. In one embodiment the circuit includes a turn-off rectifier coupled to the turn-on rectifier; a turn-off capacitor coupled in parallel to the turn-off rectifier with a cathode of the GTO being coupled to a second side of the turn-on capacitor and a first side of the turn-off capacitor; and a turn-off MCT having a gate coupled to the MOS gate driver, an anode coupled to the source of the MOSFET and a cathode coupled to a second side of the turn-off capacitor. In an alternative embodiment the circuit includes a turn-off rectifier; a turn-off capacitor coupled in parallel to the turn-off rectifier; and a turn-off MCT having a gate coupled to the MOS gate driver, an anode coupled to one side of the turn-off capacitor, and a cathode coupled the cathode of the GTO. Either embodiment may further include a detection logic unit for evaluating the current to monitor for GTO failure conditions or for modulating the current for information transfer to the MOS gate driver.
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"Further Refinements to an Optimum Gate Drive for High Power GTO Thyristors" by P. Szilagi, et al, PCC-Yokoyama '93, 1993 IEEE, pp. 44-48.
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"Thyristors" Power Electronics Circuits, Devices and Applications by M.H. Rashid, Chap 14, Sec 14-3, pp. 471-484.
Agosti Ann M.
Callahan Timothy P.
General Electric Company
Snyder Marvin
Zweizig Jeffrey
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