Wireless power receiver circuitry
First Claim
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1. A device for receiving wireless charging power from a source comprising:
- a receive antenna configured to wirelessly receive charging power from the source;
a power converter coupled to the receive antenna and configured to receive an input voltage derived from the charging power and provide at least a portion of the charging power to a load, the power converter further configured to, in response to detecting an increase in the load, reduce an input impedance of the power converter to maintain an output voltage above an output threshold voltage level; and
circuitry operationally coupled to the power converter, the circuitry comprising a first transistor coupled to each of an end of a first diode and a ground voltage and a second transistor coupled to each of a feedback voltage that is fed into the power converter via a first resistor and the ground voltage, the circuitry configured to prevent a pulse width modulation duty cycle from increasing above a fixed maximum pulse width modulation duty cycle that prevents the input impedance from dropping below a minimum impedance value.
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Abstract
Exemplary embodiments are directed to wireless power receivers. A device may include a power converter configured to receive an input voltage. The device may further include circuitry configured to limit a pulse width modulation duty cycle of the power converter to prevent the input voltage from dropping below a threshold voltage.
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Citations
25 Claims
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1. A device for receiving wireless charging power from a source comprising:
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a receive antenna configured to wirelessly receive charging power from the source; a power converter coupled to the receive antenna and configured to receive an input voltage derived from the charging power and provide at least a portion of the charging power to a load, the power converter further configured to, in response to detecting an increase in the load, reduce an input impedance of the power converter to maintain an output voltage above an output threshold voltage level; and circuitry operationally coupled to the power converter, the circuitry comprising a first transistor coupled to each of an end of a first diode and a ground voltage and a second transistor coupled to each of a feedback voltage that is fed into the power converter via a first resistor and the ground voltage, the circuitry configured to prevent a pulse width modulation duty cycle from increasing above a fixed maximum pulse width modulation duty cycle that prevents the input impedance from dropping below a minimum impedance value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for receiving wireless charging power from a source comprising:
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wirelessly receiving charging power at a receive antenna from the source; receiving an input voltage derived from the charging power at a power converter coupled to the receive antenna; providing at least a portion of the charging power to a load; in response to detecting an increase in the load, reducing an input impedance of the power converter; maintaining an output voltage above an output threshold voltage level in response to reducing the input impedance; and preventing, by a circuitry operationally coupled to the power converter, a pulse width modulation duty cycle from increasing above a fixed maximum pulse width modulation duty cycle that prevents the input impedance from dropping below a minimum impedance value, the circuitry comprising a first transistor coupled to each of an end of a diode and a ground voltage and a second transistor coupled to each of a feedback voltage that is fed into the power converter via a resistor and the ground voltage. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A device for receiving wireless charging power from a source comprising:
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means for wirelessly receiving charging power from the source; means for receiving an input voltage derived from the charging power, the means for receiving the input voltage coupled to the means for wirelessly receiving charging power; means for providing at least a portion of the charging power to a load; means for reducing an input impedance of the receiving means in response to detecting an increase in the load; means for maintaining an output voltage above an output threshold voltage level in response to reducing the input impedance; and means for preventing a pulse width modulation duty cycle from increasing above a fixed maximum pulse width modulation duty cycle that prevents the input impedance from dropping below a minimum impedance value, the preventing means comprising a first transistor coupled to each of an end of a diode and a ground voltage and a second transistor coupled to each of a feedback voltage that is fed into the reducing means via a resistor and the ground voltage.
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Specification