Systems and methods for limiting voltage in wireless power receivers
First Claim
1. A method for wirelessly receiving power using a wireless power receiver, the method comprising:
- generating, using a receive coil circuit, an alternating current (AC) signal in response to a magnetic field generated by a transmitter;
rectifying the AC signal to produce a direct current (DC) signal having an output voltage,determining an operating condition of the receiver based on a comparison of the output voltage to a plurality of threshold voltages, wherein the receiver is determined to be in an overvoltage operating condition if the output voltage is equal to or greater than an overvoltage threshold value, that the receiver is in a high voltage operating condition if the output voltage is below the overvoltage threshold value but above a maximum voltage at which the receiver can operate at a steady state, and that the receiver is in a steady state operating condition if the output voltage is below the maximum voltage at which the receiver can operate at the steady state but above a minimum voltage at which the receiver can operate at the steady state; and
transmitting a signal to the transmitter indicative of the operating condition of the receiver.
1 Assignment
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Accused Products
Abstract
This disclosure provides systems, methods, and apparatus for the limiting of voltage in wireless power receivers. In one aspect, an apparatus includes a power transfer component configured to receive power wirelessly from a transmitter. The apparatus further includes a circuit coupled to the power transfer component and configured to reduce a received voltage when activated. The apparatus further includes a controller configured to activate the circuit when the received voltage reaches a first threshold value and configured to deactivate the circuit when the received voltage reaches a second threshold value. The apparatus further includes an antenna configured to generate a signal to the transmitter that signals to the transmitter that the received voltage reached the first threshold value.
22 Citations
20 Claims
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1. A method for wirelessly receiving power using a wireless power receiver, the method comprising:
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generating, using a receive coil circuit, an alternating current (AC) signal in response to a magnetic field generated by a transmitter; rectifying the AC signal to produce a direct current (DC) signal having an output voltage, determining an operating condition of the receiver based on a comparison of the output voltage to a plurality of threshold voltages, wherein the receiver is determined to be in an overvoltage operating condition if the output voltage is equal to or greater than an overvoltage threshold value, that the receiver is in a high voltage operating condition if the output voltage is below the overvoltage threshold value but above a maximum voltage at which the receiver can operate at a steady state, and that the receiver is in a steady state operating condition if the output voltage is below the maximum voltage at which the receiver can operate at the steady state but above a minimum voltage at which the receiver can operate at the steady state; and transmitting a signal to the transmitter indicative of the operating condition of the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for wirelessly receiving power, the apparatus comprising:
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a receive coil circuit configured to generate an alternating current (AC) signal in response to a magnetic field generated by a transmitter; a rectifier coupled to the receive coil circuit and configured to rectify the AC signal to produce a direct current (DC) signal having an output voltage, controlling circuitry configured to determine an operating condition of the apparatus based on a comparison of the output voltage to a plurality of threshold voltages, wherein the controlling circuitry is configured to determine that the apparatus is in an overvoltage operating condition if the output voltage is equal to or greater than an overvoltage threshold value, that the apparatus is in a high voltage operating condition if the output voltage is below the overvoltage threshold value but above a maximum voltage at which the apparatus can operate at a steady state, and that the apparatus is in a steady state operating condition if the output voltage is below the maximum voltage at which the apparatus can operate at the steady state but above a minimum voltage at which the apparatus can operate at the steady state; and an antenna configured to transmit a signal to the transmitter indicative of the operating condition of the apparatus. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus for wirelessly receiving power, the apparatus comprising:
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a receive coil circuit configured to generate an alternating current (AC) signal in response to a magnetic field generated by a transmitter; a rectifier coupled to the receive coil circuit and configured to rectify the AC signal to produce a direct current (DC) signal having an output voltage, means for measuring a value of the output voltage to determine an operating condition of the apparatus based on a comparison of the output voltage to a plurality of threshold voltages, wherein the measuring means is configured to determine that the apparatus is in an overvoltage operating condition if the output voltage is equal to or greater than an overvoltage threshold value, that the apparatus is in a high voltage operating condition if the output voltage is below the overvoltage threshold value but above a maximum voltage at which the apparatus can operate at a steady state, and that the apparatus is in a steady state operating condition if the output voltage is below the maximum voltage at which the apparatus can operate at the steady state but above a minimum voltage at which the apparatus can operate at the steady state; and means for transmitting a signal to the transmitter indicative of the operating condition of the apparatus. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification