Wireless power transmitter and method for controlling the same
First Claim
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1. A method of controlling a wireless power transmitter, the method comprising:
- actuating the wireless power transmitter to transmit a beacon signal;
determining approach of an external object according to a detected change in the beacon signal;
transmitting ping signals having different frequencies responsive to the determined approach of the external object; and
wirelessly transmitting power to a wireless power receiver based upon a ping signal receipt indication by a wireless power receiver,wherein, the wireless transmitting of power includes adjusting an impedance of a variable resonator of the wireless power transmitter according to a sensed change of a control variable during the wireless transmitting of power, the adjusting of the impedance according to the sensed change being performed to increase a voltage gain of the power transmission to the wireless power receiver over a power transmission to the wireless power receiver with the changed control variable and without the adjusted impedance according to the sensed change.
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Abstract
A method of controlling a wireless power transmitter includes actuating the wireless power transmitter to transmit a beacon signal, determining approach of an external object according to a detected change in the beacon signal, and transmitting ping signals having different frequencies responsive to the determined approach of the external object.
12 Citations
21 Claims
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1. A method of controlling a wireless power transmitter, the method comprising:
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actuating the wireless power transmitter to transmit a beacon signal; determining approach of an external object according to a detected change in the beacon signal; transmitting ping signals having different frequencies responsive to the determined approach of the external object; and wirelessly transmitting power to a wireless power receiver based upon a ping signal receipt indication by a wireless power receiver, wherein, the wireless transmitting of power includes adjusting an impedance of a variable resonator of the wireless power transmitter according to a sensed change of a control variable during the wireless transmitting of power, the adjusting of the impedance according to the sensed change being performed to increase a voltage gain of the power transmission to the wireless power receiver over a power transmission to the wireless power receiver with the changed control variable and without the adjusted impedance according to the sensed change. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling a wireless power transmitter, the method comprising:
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actuating the wireless power transmitter to transmit a beacon signal; determining approach of an external object according to a detected change in the beacon signal; transmitting ping signals having different frequencies responsive to the determined approach of the external object; adjusting impedance of the wireless power transmitter in response to receiving a signal from a wireless power receiver in response to the ping signals; wirelessly transmitting power to the wireless power receiver, including wirelessly transmitting power to the wireless power receiver at the adjusted impedance; and sensing the wireless power transmitter for indications of electrical characteristic changes, with respect to the wireless transmitting of power at the adiusted impedance, of the wireless power transmitter representing a sensed change of a control variable, wherein the wirelessly transmitting of power to the wireless power receiver further includes; upon the sensing of the change of the control variable, wirelessly transmitting power to the wireless power receiver with an adjusting of the adiusted impedance of the wireless power transmitter according to the sensed change in the control variable.
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9. A wireless power transmitter, comprising:
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a power transmitter configured to wirelessly transmit power using a variable resonator; and a controller configured to control the power transmitter to transmit ping signals having different respective frequencies, and to control the variable resonator based on a response signal from a wireless power receiver to enter a power transfer phase with the wireless power transmitter to transfer power to the wireless power receiver, wherein the controller is further configured to adjust an impedance of the variable resonator of the wireless power transmitter according to a sensed change of a control variable during the wireless transmission phase, the adjusting of the impedance according to the sensed change being performed to increase a voltage gain of a power transmission to the wireless power receiver over a power transmission to the wireless power receiver with the changed control variable and without the adjusted impedance according to the sensed change. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A wireless power transmitter, comprising:
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a power transmitter configured to wirelessly transmit power using a variable resonator; and a controller configured to control the power transmitter to transmit ping signals having different respective frequencies, and to control the variable resonator based on a response signal, wherein the controller is configured to control the power transmitter to wirelessly transmit power to the wireless power receiver according to the control of the variable resonator based on the response signal, sense the wireless power transmitter for indications of electrical characteristic changes, with respect to the wireless transmitting of power according to the control of the variable resonator based on the response signal, of the wireless power transmitter representing a sensed change of a control variable, and upon the sensing of the change of the control variable, control the power transmitter to wirelessly transmit power to the wireless power receiver with an adjusting of a capacitance of the variable resonator in accordance with the sensed change in the control variable.
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16. A wireless power receiver, comprising:
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a resonator configured to receive wireless transmissions of different frequencies from a wireless power transmitter; and a modulator coupled to the resonator and configured to modulate a data feed responsive to a plurality of the wireless transmissions to encode at least one operational characteristic of the wireless power receiver to adaptively adjust a wireless transmission by the wireless power transmitter for reception of power according to one of the plurality of wireless transmissions, wherein the modulator modulates information for operational characteristics for each of the plurality of wireless transmissions and transmits respective response signals, with respective modulated information for each of the plurality of wireless transmissions, to the wireless power transmitter for adaptive adjustment of an impedance of the wireless power transmitter by the wireless power transmitter based on comparisons of the response signals as received by the wireless power transmitter. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification