Efficiency maximization for device-to-device wireless charging
First Claim
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1. A receiver for use in a device-to-device wireless charging system utilizing inductive coupling through an inductive element to charge a load, the receiver comprising:
- a tuning capacitor having a capacitance value selected to tune out the inductance of the inductive element;
a rectifier circuit having a pair of input terminals configured to be coupled to the inductive element through said tuning capacitor and a pair of output terminals;
a converter circuit having a pair of input terminals coupled to the output terminals of said rectifier circuit and having a pair of output terminals configured to be coupled to the load; and
an efficiency processor coupled to dynamically determine input voltage and current signals of said rectifier and to use the determined input voltage and current signals to generate an efficiency value used to control said converter such that an impedance looking into the rectifier input terminals over a given time period corresponds to an impedance which substantially maximizes efficiency of power transfer to the receiver and wherein said efficiency processor generates the efficiency value utilizing only dynamically determined values which are fully measurable in the receiver.
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Abstract
Described is a receiver for improving end-to-end efficiency in a device-to-device wireless charging system using resonant energy transfer through an inductive link. The receiver includes an efficiency controller which dynamically tracks a maximum efficiency point and controls an impedance between an inductive coupling of the receiver and a receiver rectifier circuit such that an impedance seen by the inductive coupling is an impedance which maximizes (or nearly maximizes) efficiency of the inductively coupled wireless power transfer operation.
81 Citations
20 Claims
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1. A receiver for use in a device-to-device wireless charging system utilizing inductive coupling through an inductive element to charge a load, the receiver comprising:
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a tuning capacitor having a capacitance value selected to tune out the inductance of the inductive element; a rectifier circuit having a pair of input terminals configured to be coupled to the inductive element through said tuning capacitor and a pair of output terminals; a converter circuit having a pair of input terminals coupled to the output terminals of said rectifier circuit and having a pair of output terminals configured to be coupled to the load; and an efficiency processor coupled to dynamically determine input voltage and current signals of said rectifier and to use the determined input voltage and current signals to generate an efficiency value used to control said converter such that an impedance looking into the rectifier input terminals over a given time period corresponds to an impedance which substantially maximizes efficiency of power transfer to the receiver and wherein said efficiency processor generates the efficiency value utilizing only dynamically determined values which are fully measurable in the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A receiver for use in a device-to-device wireless charging system utilizing inductive coupling through an inductive element to charge a load, the receiver comprising:
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a class-ϕ
2 rectifier circuit having a pair of input terminals configured to be coupled to the inductive element and a pair of output terminals;a boost converter circuit having a pair of input terminals coupled to the output terminals of said class-ϕ
2 rectifier circuit and having a pair of output terminals configured to be coupled to the load; andan efficiency processor comprising a maximum efficiency point tracker (MEPT), said efficiency processor coupled to dynamically determine input voltage and current signals of said class-ϕ
2 rectifier and to use the determined input voltage and current signals to generate an efficiency value used to control said boost converter such that an impedance looking into the class-ϕ
2 rectifier input terminals corresponds to an impedance which substantially maximizes efficiency of power transfer to the receiver and wherein said MEPT generates the efficiency value utilizing only dynamically determined values which are fully measurable in the receiver. - View Dependent Claims (11, 12, 13, 14)
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15. A receiver for use in a device-to-device wireless charging system utilizing inductive coupling, the receiver comprising:
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a resonant-tuned coil; a tuning capacitor having a capacitance value selected to tune out the inductance of the resonant-tuned coil; a rectifier circuit having a pair of input terminals configured to be coupled to said resonant-tuned coil through said tuning capacitor and a pair of output terminals; a converter circuit having a pair of input terminals coupled to the output terminals of said rectifier circuit and having a pair of output terminals configured to be coupled to the load; and an efficiency processor coupled to dynamically determine input voltage and current signals of said rectifier and to use the determined input voltage and current signals to generate an efficiency value used to control said converter such that an impedance looking into the rectifier input terminals corresponds to an impedance which substantially maximizes efficiency of power transfer through inductive coupling to the receiver and wherein said efficiency value is generated utilizing only dynamically determined values which are fully measurable in the receiver. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification