Power conversion apparatus and methods employing variable-level inverters
First Claim
1. A power conversion apparatus comprising:
- first and second DC busses;
a neutral node;
an inductor configured to be coupled to a load; and
an inverter circuit coupled to the first and second DC busses, to the neutral node and to the inductor and configured to selectively couple the first and second DC busses and the neutral node to a first terminal of the inductor to generate an AC voltage at a second terminal of the inductor such that, in a given half-cycle of the AC voltage, the inverter circuit uses a switching sequence wherein the first DC bus, the second DC bus and the neutral node are successively coupled to the first terminal of the inductor.
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Accused Products
Abstract
A power conversion apparatus, such as an uninterruptible power supply, included first and second DC busses, a neutral node and an inductor configured to be coupled to a load. The apparatus further includes an inverter circuit coupled to the first and second DC busses, to the neutral node and to the inductor and configured to selectively couple the first and second DC busses and the neutral node to a first terminal of the inductor to generate an AC voltage at a second terminal of the inductor such that, in a given half-cycle of the AC voltage, the inverter circuit uses a switching sequence wherein the first DC bus, the second DC bus and the neutral node are successively coupled to the first terminal of the inductor.
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Citations
21 Claims
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1. A power conversion apparatus comprising:
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first and second DC busses; a neutral node; an inductor configured to be coupled to a load; and an inverter circuit coupled to the first and second DC busses, to the neutral node and to the inductor and configured to selectively couple the first and second DC busses and the neutral node to a first terminal of the inductor to generate an AC voltage at a second terminal of the inductor such that, in a given half-cycle of the AC voltage, the inverter circuit uses a switching sequence wherein the first DC bus, the second DC bus and the neutral node are successively coupled to the first terminal of the inductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12)
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9. A power conversion apparatus comprising:
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first and second DC busses; and an inverter circuit coupled to the first and second DC busses and to a first terminal of the inductor and configured to selectively transition between different inverter level modes of operation to compensate for imbalance of the first and second DC busses with respect to a neutral node. - View Dependent Claims (13, 14, 15)
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16. A method comprising:
selectively transitioning an inverter between different inverter level modes of operation to compensate for imbalance of first and second DC busses coupled to the inverter. - View Dependent Claims (17, 18, 19, 20, 21)
Specification