Invertor
First Claim
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1. An inverter comprising:
- a plurality of invertor bridges, which operate in parallel on a same DC voltage intermediate circuit;
summer means for summing output voltages of the invertor bridges, and having a center tap, which can be grounded via a ground connection;
the invertor bridges each being driven with pulse duration modulation according to an auxiliary control voltage, and auxiliary control voltages of the individual invertor bridges having a constant phase difference between one another; and
switching means arranged in the ground connection in order to attenuate or suppress in-phase interference currents flowing via the ground connection and interference voltages associated with said interference currents.
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Abstract
An invertor having a plurality of invertor bridges which operate in parallel and whose output voltages are summed. The invertor bridges are driven with pulse duration modulation according to an auxiliary control voltage. The auxiliary control voltages of the individual invertor bridges have a constant phase difference between one another. The output voltages of the bridges are summed by a center tap which is grounded by a ground connection. Effective suppression of the common-mode current distortion is achieved by having the switch arranged in the ground connection.
28 Citations
28 Claims
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1. An inverter comprising:
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a plurality of invertor bridges, which operate in parallel on a same DC voltage intermediate circuit;
summer means for summing output voltages of the invertor bridges, and having a center tap, which can be grounded via a ground connection;
the invertor bridges each being driven with pulse duration modulation according to an auxiliary control voltage, and auxiliary control voltages of the individual invertor bridges having a constant phase difference between one another; and
switching means arranged in the ground connection in order to attenuate or suppress in-phase interference currents flowing via the ground connection and interference voltages associated with said interference currents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An inverter comprising:
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a plurality of invertor bridges operating in parallel on a same DC voltage intermediate circuit;
a summer configured to sum output voltages of the plurality of invertor bridges, and having a center tap which can be grounded via a ground connection;
said invertor bridges each being driven with pulse duration modulation according to an auxiliary control voltage, and auxiliary control voltages of the individual invertor bridges having a constant phase difference between one another; and
a switching mechanism configured to attenuate or suppress in-phase interference currents flowing via the ground connection and interference voltages associated with said interference currents. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
wherein each inverter bridge is respectively connected on an output side to a primary winding, and wherein the secondary windings are connected in series so as to sum the output voltages. -
27. The invertor as claimed in claim 26, further comprising:
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2n (n=1, 2, 3, . . . ) inverter bridges and primary windings and secondary windings, wherein the center tap is arranged between the n-th and the (n+1)-th secondary winding.
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28. The use of an invertor as claimed in claim 21 in a converter having a DC voltage intermediate circuit.
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Specification