Protective circuit for a network-controlled thyristor bridge

Details Protective circuit for a network-controlled thyristor bridge Protective circuit for a network-controlled thyristor bridge

2005-06-07

2005-06-07

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S091100, C361S100000

Reexamination Certificate

active

06903911

ABSTRACT:
A protective circuit (SCH) for a line-commutated thyristor bridge (B, B′), which is designed for feeding energy of a power circuit connected to the bridge and also for feedback from this circuit, and which is connected between the thyristor bridge and the power circuit. In a series branch of the protective circuit, there is at least one IGBT transistor (GT1,GT2), which is biased in the feedback direction with an inverse-parallel diode (D1,D2;D1p), and which can be deactivated for the appearance of a tipping recognition signal (sk, Us1), which is supplied by a control circuit (AST) associated with the transistor.

REFERENCES:
patent: 4137489 (1979-01-01), Lipo
patent: 4366388 (1982-12-01), Wilkerson
patent: 4695932 (1987-09-01), Higashino
patent: 4845413 (1989-07-01), Hackl et al.
patent: 26 41 545 (1978-03-01), None
patent: 3129111 (1982-12-01), None
patent: 3836274 (1990-04-01), None
patent: 2 703 858 (1994-10-01), None

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