Power conversion devices and control methods therefor
First Claim
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1. A power conversion device comprising:
- input circuitry configured to be coupled to a power source or load, the input circuitry comprising at least one switching device or diode;
an output switch bridge configured to be coupled to a load or power source, the output switch bridge comprising at least four controllable switching devices arranged in a bridge configuration to control current output; and
a link stage comprising at least one reactive component configured for alternating current (AC) operation, wherein the input circuitry, output switch bridge and link stage are operative to regulate an input and an output currents and manage power mismatch between the power source and load;
wherein the device is operative in at least three states in a switching cycle, including at least one state to charge the reactive component of the link stage from the power source, at least one state in which power is discharged from the link stage into the load, and a single state in which no power is transferred through the link stage and one or both of a link voltage remains constant and a link current is zero or remains constant.
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Abstract
Power conversion devices with control algorithms that can solve the double frequency harmonic problem are provided, as are techniques for controlling power converters when the instantaneous values of input and output power are not the same.
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Citations
20 Claims
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1. A power conversion device comprising:
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input circuitry configured to be coupled to a power source or load, the input circuitry comprising at least one switching device or diode; an output switch bridge configured to be coupled to a load or power source, the output switch bridge comprising at least four controllable switching devices arranged in a bridge configuration to control current output; and a link stage comprising at least one reactive component configured for alternating current (AC) operation, wherein the input circuitry, output switch bridge and link stage are operative to regulate an input and an output currents and manage power mismatch between the power source and load; wherein the device is operative in at least three states in a switching cycle, including at least one state to charge the reactive component of the link stage from the power source, at least one state in which power is discharged from the link stage into the load, and a single state in which no power is transferred through the link stage and one or both of a link voltage remains constant and a link current is zero or remains constant. - 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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Specification