Power electronic circuit arrangement having plural power converters
First Claim
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1. A power electronic circuit arrangement, comprising:
- a first power converter which is connected via a first DC voltage intermediate circuit, having a first intermediate circuit voltage Uzk1, and a first rectifier to a power supply system and which has at least one load terminal switchable between a positive first intermediate circuit voltage +Uzk1, a negative first intermediate circuit voltage -Uzk1 and 0V; and
at least one second power converter which has a second DC voltage intermediate circuit having a second intermediate circuit voltage Uzk2 and which is connected to each load terminal of the first power converter and is connected upstream of a load such that at least one of a positive second intermediate circuit voltage +Uzk2, a negative second intermediate circuit voltage -Uzk2 and 0 V can optionally be added to a voltage value which is switched by the first power converter to the at least one load terminal.
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Abstract
A power electronic circuit arrangement which comprises a first power converter is specified. A second power converter is connected between the load terminals of the first power converter and a load. The negative or positive values of the DC voltage intermediate circuits of the first and second power converters can be added by means of corresponding driving of the power converters. This achieves finer voltage gradation and, consequently, an improved approximation of the resulting output voltage to the sinusoidal waveform.
27 Citations
10 Claims
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1. A power electronic circuit arrangement, comprising:
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a first power converter which is connected via a first DC voltage intermediate circuit, having a first intermediate circuit voltage Uzk1, and a first rectifier to a power supply system and which has at least one load terminal switchable between a positive first intermediate circuit voltage +Uzk1, a negative first intermediate circuit voltage -Uzk1 and 0V; and at least one second power converter which has a second DC voltage intermediate circuit having a second intermediate circuit voltage Uzk2 and which is connected to each load terminal of the first power converter and is connected upstream of a load such that at least one of a positive second intermediate circuit voltage +Uzk2, a negative second intermediate circuit voltage -Uzk2 and 0 V can optionally be added to a voltage value which is switched by the first power converter to the at least one load terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification