Active rectifier for efficient wireless power transfer
First Claim
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1. A device for receiving a wireless power transfer, the device comprising:
- an active rectifier;
rectifier input nodes;
a load circuit connected to the active rectifier, the load circuit comprising a voltage regulator; and
a controller operatively coupled to the active rectifier and the voltage regulator, the controller configured to control the active rectifier and the voltage regulator to modify an impedance at the rectifier input nodes by being configured to;
determine, based on one or both of circuit parameters or circuit measurements, a modification of the impedance at the rectifier input nodes, comprising a modification of one or more of a phase angle to induce a phase angle shift, an output voltage, or a duty cycle to result in one or both of a higher value of an efficiency of the wireless power transfer or a higher value of extracted power of the wireless power transfer; and
apply a control signal to the active rectifier,wherein the control signal is based on the determined modification of the impedance at the rectifier input nodes, andwherein the circuit parameters comprise a load resistance and a load reactance, and to determine the phase angle shift a load impedance is determined to raise the value of the efficiency of the wireless power transfer, wherein the value of the efficiency of the wireless power transfer is determined as a function of the load resistance and the load reactance.
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Abstract
Methods, devices, and integrated circuits are disclosed for efficiently receiving a wireless power transfer. In one example, a device configured for receiving a wireless power transfer includes an active rectifier, rectifier input nodes, and a controller. The controller is operatively coupled to the active rectifier and configured to control the active rectifier to modify the impedance at the rectifier input nodes.
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Citations
18 Claims
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1. A device for receiving a wireless power transfer, the device comprising:
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an active rectifier; rectifier input nodes; a load circuit connected to the active rectifier, the load circuit comprising a voltage regulator; and a controller operatively coupled to the active rectifier and the voltage regulator, the controller configured to control the active rectifier and the voltage regulator to modify an impedance at the rectifier input nodes by being configured to; determine, based on one or both of circuit parameters or circuit measurements, a modification of the impedance at the rectifier input nodes, comprising a modification of one or more of a phase angle to induce a phase angle shift, an output voltage, or a duty cycle to result in one or both of a higher value of an efficiency of the wireless power transfer or a higher value of extracted power of the wireless power transfer; and apply a control signal to the active rectifier, wherein the control signal is based on the determined modification of the impedance at the rectifier input nodes, and wherein the circuit parameters comprise a load resistance and a load reactance, and to determine the phase angle shift a load impedance is determined to raise the value of the efficiency of the wireless power transfer, wherein the value of the efficiency of the wireless power transfer is determined as a function of the load resistance and the load reactance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for receiving a wireless power transfer, the method comprising:
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determining, by one or more processors, based on one or both of circuit parameters or circuit measurements, a modification of an impedance at input nodes of an active rectifier that comprises a plurality of switches, comprising a modification of one or more of a phase angle to induce a phase angle shift, an output voltage, or a duty cycle, to result in one or both of a higher value of an efficiency of the wireless power transfer or a higher value of extracted power of the wireless power transfer; and applying, by the one or more processors, a control signal to at least one of the active rectifier or a voltage regulator connected to an output of the active rectifier, wherein the control signal is based on the determined modification of the impedance, wherein the applying comprises controlling a timing of the plurality of switches relative to an alternating current at the input nodes of the active rectifier, such that the timing of the switches modifies the phase angle between the input current and the input voltage of the alternating current, wherein the circuit parameters comprise one or more values of resistance and one or more values of reactance, and wherein determining the modification comprises determining the phase angle shift by determining a load impedance to raise the value of the efficiency of the wireless power transfer, wherein the load impedance is separate from the one or more values of reactance, and wherein the value of the efficiency of the wireless power transfer is determined as a function of the one or more values of resistance, the one or more values of reactance, and the load reactance.
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18. An integrated circuit for controlling a wireless power transfer, the integrated circuit being configured to:
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determine, based on one or both of circuit parameters or circuit measurements, a modification of an impedance at input nodes of an active rectifier that comprises a plurality of switches, comprising a modification of one or more of a phase angle to induce a phase angle shift, an output voltage, or a duty cycle, to result in one or both of a higher value of an efficiency of the wireless power transfer or a higher value of extracted power of the wireless power transfer; and apply a control signal to at least one of the active rectifier or a voltage regulator connected to an output of the active rectifier, wherein the control signal is based on the determined modification of the impedance, to control a timing of the switches relative to an alternating current at the input nodes of the active rectifier, such that the timing of the switches modifies the phase angle between the input current and the input voltage of the alternating current, wherein the circuit parameters comprise one or more values of resistance and one or more values of reactance, and wherein to determine the modification comprises the integrated circuit being configured to determine the phase angle shift by determining a load impedance to raise the value of the efficiency of the wireless power transfer, wherein the load impedance is separate from the one or more values of reactance, and wherein the value of the efficiency of the wireless power transfer is determined as a function of the one or more values of resistance, the one or more values of reactance and the load reactance.
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Specification