Power-conversion control system including sliding mode controller and cycloconverter
First Claim
1. A power-conversion control system comprising:
- an inverter operable to receive a DC voltage input and produce a first AC voltage output having a first frequency;
a cycloconverter having a plurality of bidirectional switches, and being operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency; and
a sliding mode controller operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition, and operable to selectively adjust the frequency and amplitude of the second AC voltage.
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Accused Products
Abstract
A power-conversion control system includes an inverter, a cycloconverter, and a sliding mode controller. The inverter is operable to receive a DC voltage input and produce a first AC voltage output having a first frequency. The cycloconverter has a plurality of bidirectional switches, and is operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency. The sliding mode controller is operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition. The sliding mode controller is also operable to selectively adjust the frequency and amplitude of the second AC voltage.
47 Citations
20 Claims
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1. A power-conversion control system comprising:
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an inverter operable to receive a DC voltage input and produce a first AC voltage output having a first frequency; a cycloconverter having a plurality of bidirectional switches, and being operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency; and a sliding mode controller operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition, and operable to selectively adjust the frequency and amplitude of the second AC voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A power-conversion control system comprising:
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an inverter operable to receive a DC voltage input and produce a first AC voltage output having a first frequency; a cycloconverter having a plurality of bidirectional switches, and being operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency; a sliding mode controller operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition, and operable to selectively adjust the frequency and amplitude of the second AC voltage; a phase shift controller operable to command at least one first gate driver to turn a plurality of power switches in the inverter OFF or ON; and a signal steering block operable to command at least one second gate driver to turn the bidirectional switches to turn OFF or ON in response to the control signal from the sliding mode controller and a synchronization signal from the phase shift controller, wherein the synchronization signal indicates when the first AC voltage is at a zero crossing condition.
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18. A method of providing alternating current to a load, comprising:
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converting a DC voltage into a first AC voltage having a first frequency; commanding a plurality of switches in a cycloconverter turn OFF or ON to synthesize a second AC voltage having a second frequency that is lower than the first frequency, wherein the plurality of switches are turned OFF or ON when first AC voltage is at a zero crossing condition; and selectively adjusting a rate at which the plurality of switches are turned OFF and ON in response to a voltage feedback signal and a current feedback signal to minimize a difference between the voltage feedback signal and a desired voltage. - View Dependent Claims (19, 20)
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Specification