| 摘要 |
The bridging unit (26) has an energy storage (48) for supplying power to a mechanical relay (34), a power switch (36) and a drive (42), where the relay and the switch electrically connect two inputs (X1, X2) of a converter cell (18). The drive has a passive overvoltage detection unit for charging the storage when overvoltage is exceeded and an electronic switch that is closed when the voltage in the storage exceeds a predefined value. The drive has hysteresis such that one of the relay and the switch is supplied with current from the storage even when the voltage in the storage is reduced. An independent claim is also included for a converter comprising a system protection unit formed such that a power switch of a bridging unit closes converter cells during convertor failure and/or system failure. |
