| CPC H02M 7/487 (2013.01) [H02M 1/346 (2021.05)] | 17 Claims |
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1. A converter device, comprising:
a converter that has a first, second, third, fourth, fifth and sixth power semiconductor switches, which each respectively have a first and a second load current connections;
a control device that is operatively designed to drive the power semiconductor switches;
the second load current connection of the first power semiconductor switch is electrically conductively connected to the first load current connection of the fifth power semiconductor switch and to the first load current connection of the second power semiconductor switch,
the second load current connection of the fifth power semiconductor switch is electrically conductively connected to the first load current connection of the sixth power semiconductor switch;
the second load current connection of the sixth power semiconductor switch is electrically conductively connected to the first load current connection of the fourth power semiconductor switch and to the second load current connection of the third power semiconductor switch;
the second load current connection of the second power semiconductor switch is electrically conductively connected to the first load current connection of the third power semiconductor switch;
the converter has a first diode (D1) electrically connected in antiparallel with the first power semiconductor switch;
a second diode is electrically connected in antiparallel with the second power semiconductor switch;
a third diode is electrically connected in antiparallel with the third power semiconductor switch;
a fourth diode is electrically connected in antiparallel with the fourth power semiconductor switch;
a fifth diode is electrically connected in antiparallel with the fifth power semiconductor switch;
a sixth diode is electrically connected in antiparallel with the sixth power semiconductor switch and an AC potential connection (AC) that is electrically conductively connected, at a central circuit node, to the second load current connection of the second power semiconductor switch and to the first load current connection of the third power semiconductor switch, wherein, during operation of the converter, the central circuit node has an output voltage (Ua) with respect to the second load current connection of the fifth power semiconductor switch and an output current (Ia) flows from the central circuit node to the AC potential connection (AC) in a current metering direction, wherein:
the control device is operative to drive the power semiconductor switches such that the first, fifth, sixth and fourth power semiconductor switches are switched on and off at a higher frequency than the respective second and the respective third power semiconductor switches;
the control device is operative, starting from a first converter basic switching state in which the output voltage (Ua) is positive, the output current (Ia) is negative and the output current (Ia) flows through the first and second diodes, to put the converter into a second converter basic switching state by at least switching on the fifth power semiconductor switch and switching on the third power semiconductor switch temporally thereafter, in which the fifth and third power semiconductor switches (T5, T3) are switched on and a first portion of the output current (Ia) flows through the second diode and through the fifth power semiconductor switch and a second portion of the output current (Ia) flows through the sixth diode and through the third power semiconductor switch; and
the control device is operative, starting from the second converter basic switching state, to put the converter into the first converter basic switching state by switching off the third power semiconductor switch and at least switching off the fifth power semiconductor switch temporally thereafter.
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