Active AC-Link Power Converter
First Claim
1. A power converter, comprising:
- an, output converter having a 3-phase or higher output;
an inductor coupled to the output converter; and
a switch device coupled to the inductor,an active clamping circuit coupled in parallel with the inductor,wherein the switch device is configured to charge the inductor via a DC input during a first stage of a switching cycle of the switch device,wherein the output converter is configured to discharge the inductor to a load coupled to the 3-phase or higher output during a second stage of the switching cycle,wherein the output converter comprises a phase leg for each phase of the 3-phase or higher output,wherein each phase leg comprises a first thyristor device connected in series with a second thyristor device,wherein each phase of the 3-phase or higher output originates between the first thyristor device and the second thyristor device of the corresponding phase leg, andwherein the active clamping circuit is configured to freewheel current in the inductor after the first stage of the switching cycle ends and before any of the thyristor devices begin conducting during the second stage of the switching code.
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Accused Products
Abstract
A power converter includes an output converter having a 3-phase or higher output, an inductor coupled to the output converter and a switch device coupled to the inductor. The switch device charges the inductor via a DC input during a first stage of a switching cycle of the switch device. The output converter discharges the inductor to a load coupled to the 3-phase or higher output during a second stage of the switching cycle. The output converter includes a phase leg for each phase of the 3-phase or higher output, each phase leg having a first thyristor device connected in series with a second thyristor device. Each phase of the 3-phase or higher output originates between the first thyristor device and the second thyristor device of the corresponding phase leg.
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Citations
22 Claims
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1. A power converter, comprising:
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an, output converter having a 3-phase or higher output; an inductor coupled to the output converter; and a switch device coupled to the inductor, an active clamping circuit coupled in parallel with the inductor, wherein the switch device is configured to charge the inductor via a DC input during a first stage of a switching cycle of the switch device, wherein the output converter is configured to discharge the inductor to a load coupled to the 3-phase or higher output during a second stage of the switching cycle, wherein the output converter comprises a phase leg for each phase of the 3-phase or higher output, wherein each phase leg comprises a first thyristor device connected in series with a second thyristor device, wherein each phase of the 3-phase or higher output originates between the first thyristor device and the second thyristor device of the corresponding phase leg, and wherein the active clamping circuit is configured to freewheel current in the inductor after the first stage of the switching cycle ends and before any of the thyristor devices begin conducting during the second stage of the switching code. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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2. (canceled)
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17. A method of converting DC power to AC power using a power converter that includes an output converter having a 3-phase or higher output, an inductor coupled to the output converter, and a switch device coupled to the inductor, and an active clamping circuit coupled in parallel with the inductor, the method comprising:
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controlling the switch device so as to charge the inductor via a DC input during, a first stage of a switching cycle of the switch device; discharging the inductor to a load coupled to the 3-phase or higher output via the output converter during a second stage of the switching cycle, the output converter comprising a phase leg for each phase of the 3-phase or higher output, each phase leg comprising a first thyristor device connected in series with a second thyristor device, each phase of the 3-phase or higher output originating between the first thyristor device and the second thyristor device of the corresponding phase leg; ensuring the inductor is fully discharged to the load before beginning another switching cycle; and freewheeling current in the inductor after the first stage of the switching cycle ends and before any of the thyristor devices begin conducting during the second stage of the switching cycle. - View Dependent Claims (19, 20, 21, 22)
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18. (canceled)
Specification