| 摘要 |
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 (GT 1, GT 2 ), which is biased in the feedback direction with an inverse-parallel diode (D 1, D 2; D 1 p), and which can be deactivated for the appearance of a tipping recognition signal (s<SUB>k</SUB>, U<SUB>s1</SUB>), which is supplied by a control circuit (AST) associated with the transistor. |
