Switchgear cell for switching five or more voltage levels

Details Switchgear cell for switching five or more voltage levels Switchgear cell for switching five or more voltage levels

H - Electricity

03

K

H03K 17/56 (2006.01) H03K 17/567 (2006.01)

Patent

CA 2677488

A switchgear cell for switching n switching voltage levels, where n = 5, 7, 9,..., is specified, which comprises a first and a second branch circuit (1, 2), wherein each branch circuit (1, 2) comprises n-1 series-connected power semiconductor switches and p = n-2 power semiconductor switch junction points between the series-connected power semiconductor switches of each branch circuit (1, 2), wherein for each branch circuit (1, 2) the power semiconductor switch junction points are counted starting with an odd counting number x from the first end (A) to the second end (B) of the respective branch circuit (1, 2). In order to realize a simple and robust switchgear cell having a small number of components and having a small space requirement, an intermediate circuit (5) is provided, wherein the intermediate circuit (5) comprises a first and a second capacitance (6, 7), and the first capacitance (6) is connected to a power semiconductor switch junction point having an odd counting number x of the first branch circuit (1) and the second capacitance (7) is connected to a power semiconductor switch junction point of the second branch circuit (2). In addition, a power semiconductor switch (9) of the intermediate circuit (5) is connected to a power semiconductor switch junction point having a counting number x < (p+1)/2 of the first or second branch circuit (1, 2) or to the first end (A). As an alternative thereto, the intermediate circuit (5) comprises a capacitance (8), wherein the capacitance (8) is connected to a power semiconductor switch junction point having a counting number x < (p+1)/2 of the first and second branch circuits (1, 2), and a power semiconductor switch (11) of the intermediate circuit (5) is connected to a power semiconductor switch junction point having a counting number x < (p+1)/2 of the first or second branch circuit (1, 2), wherein a further power semiconductor switch (12) of the intermediate circuit (5) is connected to a power semiconductor switch junction point having a counting number x <= (p+1)/2 of the first or second branch circuit (1, 2), and the further power semiconductor switch (12) of the intermediate circuit (5) is not directly connected to the capacitance (8) of the intermediate circuit (5).

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