Method and apparatus for controlling LCL converters using asymmetric voltage cancellation techniques
First Claim
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1. A computer-implemented method for controlling a circuit using asymmetric voltage cancellation techniques, comprising:
- determining a plurality of points that avoid diode reverse recovery loss based on a loading condition and at least one circuit parameter, wherein each point comprises a combination of control variables;
determining a harmonic distortion for each of the plurality of points;
determining a trajectory of points with a minimized harmonic distortion based on the determined harmonic distortion;
controlling the circuit using the combination of control variables for at least one point on the trajectory of points; and
controlling a power level in the circuit based on the loading condition.
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Abstract
A method and apparatus for LCL resonant converter control utilizing Asymmetric Voltage Cancellation is described. The methods to determine the optimal trajectory of the control variables are discussed. Practical implementations of sensing load parameters are included. Simple PI, PID and fuzzy logic controllers are included with AVC for achieving good transient response characteristics with output current regulation.
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Citations
20 Claims
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1. A computer-implemented method for controlling a circuit using asymmetric voltage cancellation techniques, comprising:
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determining a plurality of points that avoid diode reverse recovery loss based on a loading condition and at least one circuit parameter, wherein each point comprises a combination of control variables; determining a harmonic distortion for each of the plurality of points; determining a trajectory of points with a minimized harmonic distortion based on the determined harmonic distortion; controlling the circuit using the combination of control variables for at least one point on the trajectory of points; and controlling a power level in the circuit based on the loading condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A controller configured to reduce diode reverse recovery losses of a circuit, comprising:
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a processor; a memory in electronic communication with the processor, wherein the memory stores executable instructions that when executed by the processor cause the processor to perform the steps of; determining a plurality of points that avoid diode reverse recovery loss based on a loading condition and at least one circuit parameter, wherein each point comprises a combination of control variables; determining a harmonic distortion for each of the plurality of points; determining a trajectory of points with a minimized harmonic distortion based on the determined harmonic distortion; controlling the circuit using the combination of control variables for at least one point on the trajectory of points; and controlling a power level in the circuit based on the loading condition. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An inductive power transfer system, comprising:
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a resonant converter circuit having a transmitter coil; a receiver coil configured to receive power from the transmitter coil; and a controller, wherein the controller comprises a processor to perform the steps of; determining a plurality of points that avoid diode reverse recovery loss for the resonant converter based on a loading condition and at least one circuit parameter of the resonant converter circuit, wherein each point comprises a combination of control variables; determining a harmonic distortion for each of the plurality of points; determining a trajectory of points with a minimized harmonic distortion based on the determined harmonic distortion; controlling the resonant converter circuit using the combination of control variables for at least one point on the trajectory of points; and controlling a power level in the resonant converter circuit based on the loading condition. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification