Means for controlling a forced commutated hybrid A-C to D-C electric rectifying bridge to avoid reverse recovery overvoltage in the diode leg

Patent · Tue Sep 11 04:00:00 EDT 1984

OSTI ID:6158683

Brown, H J; Horvat, I N; Kumar, A K.N.

A hybrid phase-controlled rectifying bridge includes both controlled and uncontrolled electric valves referred to as thyristors and diodes, respectively. Each of a pair of thyristors is periodically fired at an ''angle'' that can be advanced or retarded as desired, whereupon load current commutates to the thyristor from the corresponding diode. Subsequently the thyristor is turned off at a desired extinction angle by the action of cyclically operative forced commutation means. To avoid reverse recovery overvoltages across a diode when the desired extinction angle is only slightly larger than the firing angle, means is provided for temporarily preventing any turnoff action during the diode-to-thyristor commutation interval and for an additional interval that gives the diode sufficient time to fully recover its reverse blocking capability.

• Assignee: General Electric Co.
• Patent Number(s): US 4471421
• OSTI ID: 6158683
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330300* -- Advanced Propulsion Systems-- Electric-Powered Systems
ALTERNATING CURRENT
ARMATURES
CONTROL EQUIPMENT
CONTROL SYSTEMS
CURRENTS
DIODE TUBES
DIRECT CURRENT
ELECTRIC COILS
ELECTRIC CURRENTS
ELECTRIC MOTORS
ELECTRIC POTENTIAL
ELECTRIC RAILWAYS
ELECTRIC-POWERED VEHICLES
ELECTRICAL EQUIPMENT
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FUNCTION GENERATORS
MOTORS
OVERVOLTAGE
PULSE GENERATORS
RAILWAYS
RECTIFIERS
SEMICONDUCTOR DEVICES
THYRISTORS
TRANSFORMERS
VALVES
VEHICLES