| 摘要 |
The invention relates to a sub-module (31) for a multi-point converter, comprising a unipolar energy store (16), two connecting terminals (22, 23), and a semiconductor circuit (17, 26) that has at least two controllable power semiconductor switches (18, 19, 27, 28), a separate free running diode (20, 21, 29, 30) being connected in parallel to each switch in an opposite direction. At least one semiconductor component (32) is connected in parallel to the unipolar energy store (16) in a low-inductive manner, said component bridging the energy store (16) in the event of a fault. The aim of the invention is to provide such a sub-module that reliably bridges the two connecting terminals of the sub-module in the event of a fault. This is achieved in that each free running diode (20, 21, 29, 30) is a disk cell diode and part of a circuit unit (39) that has an emitter plate (41) and a collector plate (42), between which the disk cell diode (20, 21, 29, 30) is clamped. The collector plate (42) is connected to a collector terminal (5) of the power semiconductor switch (18, 19, 27, 28), and the emitter plate (41) is connected to an emitter terminal (4) of the power semiconductor switch (18, 19, 27, 28) that is connected in parallel to said free running diode (20, 21, 29, 30). |
