Systems and methods for measuring power and impedance in wireless power charging systems
First Claim
1. An apparatus for measuring wireless power transfer at an operating frequency between a transmitter and a receiver, the apparatus comprising:
- a first clock configured to generate a first clock signal at a first clock frequency;
a current zero crossing detector configured to detect a zero crossing of a current of the wireless power transfer at a transmit antenna of the transmitter;
a voltage zero crossing detector configured to detect a zero crossing of a voltage at the transmit antenna of the wireless power transfer; and
a controller configured to operate based on a second clock signal, the first clock frequency different than a second clock frequency of the second clock signal, the controller further configured to determine a phase offset between the voltage and the current of the wireless power transfer by measuring an amount of time between the zero crossing of current and the zero crossing of voltage based on the first clock signal, and to measure an amount of wireless power transfer based on the first clock signal, the voltage, the current, and the phase offset.
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Accused Products
Abstract
A wireless power transmitter may generate a magnetic field via a transmit antenna to induce voltage in a receive antenna of a wireless power receiver to power the unit and/or charge the receiver'"'"'s battery. An apparatus for measuring wireless power transfer at an operating frequency between the transmitter and the receiver is provided. The apparatus comprises a first clock configured to generate a first clock signal at a first clock frequency that is higher than the operating frequency of the wireless power transfer. The apparatus further comprises a controller configured to operate based on a second clock signal, the first clock frequency higher than a second clock frequency of the second clock signal. The controller is further configured to measure an amount of wireless power transfer based on the first clock signal.
21 Citations
18 Claims
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1. An apparatus for measuring wireless power transfer at an operating frequency between a transmitter and a receiver, the apparatus comprising:
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a first clock configured to generate a first clock signal at a first clock frequency; a current zero crossing detector configured to detect a zero crossing of a current of the wireless power transfer at a transmit antenna of the transmitter; a voltage zero crossing detector configured to detect a zero crossing of a voltage at the transmit antenna of the wireless power transfer; and a controller configured to operate based on a second clock signal, the first clock frequency different than a second clock frequency of the second clock signal, the controller further configured to determine a phase offset between the voltage and the current of the wireless power transfer by measuring an amount of time between the zero crossing of current and the zero crossing of voltage based on the first clock signal, and to measure an amount of wireless power transfer based on the first clock signal, the voltage, the current, and the phase offset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12)
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10. A method for measuring wireless power transfer at an operating frequency between a transmitter and a receiver, the method comprising:
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generating a first clock signal at a first clock frequency; determining a phase offset between a voltage and a current of the wireless power transfer, wherein determining the phase offset comprises; detecting a zero crossing of the current; and detecting a zero crossing of the voltage, wherein determining the phase offset between the voltage and the current comprises measuring an amount of time between the zero crossing of current and the zero crossing of voltage based on the first clock signal; and measuring by a controller an amount of wireless power transfer based on the first clock signal, the voltage, the current, and the phase offset, wherein the controller is configured to operate based on a second clock signal, the first clock frequency different than a second clock frequency of the second clock. - View Dependent Claims (11, 13, 14)
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15. An apparatus for measuring wireless power transfer at an operating frequency between a transmitter and a receiver, the apparatus comprising:
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means for generating a first clock signal at a first clock frequency; means for determining a phase offset between a voltage and a current of the wireless power transfer, wherein the determining means comprises; means for detecting a zero crossing of the current; and means for detecting a zero crossing of the voltage; and means for measuring an amount of time between the zero crossing of current and the zero crossing of voltage based on the first clock signal to determine the phase offset between the voltage and the current; and means for measuring an amount of wireless power transfer based on the first clock signal, the voltage, the current, and the phase offset, the measuring means configured to operate based on a second clock signal, the first clock frequency different than a second clock frequency of the second clock. - View Dependent Claims (16, 17, 18)
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Specification