Power converter apparatus and methods using neutral coupling circuits with interleaved operation
First Claim
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1. A power converter apparatus comprising:
- a rectifier having an input coupled to an AC source and an output coupled to a first DC bus and a second DC bus and configured to generate a DC voltage across the first and second DC busses;
an inverter having an input coupled to the first DC bus and the second DC bus and configured to generate an AC output with respect to a neutral terminal at a phase output terminal;
parallel first and second neutral coupling circuits, each configured to selectively couple the first DC bus and the second DC bus to the neutral terminal; and
a control circuit configured to cause interleaved operation of the neutral coupling circuits while the rectifier is generating the DC voltage across the first and second DC busses.
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Abstract
A power converter apparatus, such as an uninterruptible power supply (UPS), includes an inverter having an input coupled to a first DC bus and a second DC bus and configured to generate an AC output with respect to a neutral terminal at a phase output terminal thereof. The apparatus further includes first and second neutral coupling circuits, each configured to selectively couple the first DC bus and the second DC bus to the neutral terminal, and a control circuit configured to cause interleaved operation of the neutral coupling circuits.
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Citations
21 Claims
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1. A power converter apparatus comprising:
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a rectifier having an input coupled to an AC source and an output coupled to a first DC bus and a second DC bus and configured to generate a DC voltage across the first and second DC busses; an inverter having an input coupled to the first DC bus and the second DC bus and configured to generate an AC output with respect to a neutral terminal at a phase output terminal; parallel first and second neutral coupling circuits, each configured to selectively couple the first DC bus and the second DC bus to the neutral terminal; and a control circuit configured to cause interleaved operation of the neutral coupling circuits while the rectifier is generating the DC voltage across the first and second DC busses. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An uninterruptible power supply (UPS), comprising:
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a phase output terminal; a neutral terminal; a first DC bus and a second DC bus; a rectifier having an input coupled to an AC source and an output coupled to the first DC bus and the second DC bus and configured to generate a DC voltage across the first and second DC busses; a common mode inductor having a first terminal coupled to one of the first DC bus and the second DC bus and a second terminal configured to be coupled to a battery; a filter capacitor coupled between the second terminal of the common mode inductor and the neutral terminal; an inverter coupled to the first DC bus and second DC bus and configured to generate an AC output with respect to the neutral terminal at the phase output terminal; parallel first and second neutral coupling circuits coupled in parallel between the first DC bus and the second DC bus and each configured to selectively couple the first DC bus and the second DC bus to the neutral terminal; and a control circuit configured to cause interleaved operation of the neutral coupling circuits while the rectifier is generating the DC voltage across the first and second DC busses. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a power conversion apparatus comprising a rectifier having an input coupled to an AC source and an output coupled to a first DC bus and a second DC bus and configured to generate a DC voltage across the first and second DC busses and an inverter coupled to the first and second DC busses and configured to generate an AC output with respect to a neutral terminal at a phase output terminal, the method comprising:
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providing parallel first and second neutral coupling circuits, each configured to selectively couple the first DC bus and the second DC bus to a neutral terminal; and interleaving operations of the first and second neutral coupling circuits while operating the rectifier to generate the DC voltage across the first and second DC busses and operating the inverter to generate the AC voltage with respect to the neutral terminal. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification