Patent ID: 7639515
Filing Date: 2009-12-29
Classification: H02M

Abstract:
1. A switchgear cell having a first energy store and a second energy store connected in series therewith, having a first, second, third and fourth power semiconductor switch, wherein the first, second, third and fourth power semiconductor switch are in each case a drivable bidirectional power semiconductor switch with a controlled unidirectional current-carrying direction and the first, second, third and fourth power semiconductor switch are connected in series and the first power semiconductor switch is connected to the first energy store and the fourth power semiconductor switch is connected to the second energy store, having a third energy store, which is connected to the junction point between the first power semiconductor switch and the second power semiconductor switch and to the junction point between the third power semiconductor switch and the fourth power semiconductor switch, wherein a switching element with a controlled bidirectional current-carrying direction is connected directly to the junction point between the second and the third power semiconductor switch and directly to the junction point between the first energy store and the second energy store.