Apparatuses and related methods for modulating power of a wireless power receiver
First Claim
1. A wireless power enabled apparatus, comprising:
- a wireless power receiver, including;
a resonant tank configured to generate an AC power signal responsive to an electromagnetic field, wherein the AC power signal fluctuates among a range of voltages during operation, wherein a high end of the range is greater than or equal to 4 times a low end of the range;
a rectifier including a plurality of switches configured to receive the AC power signal and generate a DC output power signal at a rectified voltage level, wherein the plurality of switches enter a breakdown state when the rectified voltage level reaches a breakdown voltage level that is less than or equal to 1.6 times a desired voltage level; and
control logic configured to monitor a voltage of the wireless power receiver, detect a trend in the monitored voltage, and select an overlap delay such that the plurality of switches are temporarily enabled at the same time, the overlap delay being selected based on the trend to maintain the rectified voltage level near the desired voltage level without exceeding the breakdown voltage level.
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Accused Products
Abstract
A wireless power enabled apparatus may comprise a wireless power receiver that includes a receive coil configured to generate an AC signal responsive an electromagnetic field, a rectifier including a plurality of switches configured to receive the AC signal and generate an output power signal, and control logic configured to control the plurality of switches to cause the rectifier to modulate the output power signal. The control logic may be configured to control the plurality of switches within the rectifier to have an overlap delay that modulates at least one parameter of the wireless power receiver. A method of operating a receiver side of a wireless power transfer system comprises generating an output power signal including a rectified voltage and a rectified current responsive to receiving a wireless power signal, and controlling a rectifier according to at least one mode including a power modulation mode modulating the output power signal.
13 Citations
18 Claims
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1. A wireless power enabled apparatus, comprising:
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a wireless power receiver, including; a resonant tank configured to generate an AC power signal responsive to an electromagnetic field, wherein the AC power signal fluctuates among a range of voltages during operation, wherein a high end of the range is greater than or equal to 4 times a low end of the range; a rectifier including a plurality of switches configured to receive the AC power signal and generate a DC output power signal at a rectified voltage level, wherein the plurality of switches enter a breakdown state when the rectified voltage level reaches a breakdown voltage level that is less than or equal to 1.6 times a desired voltage level; and control logic configured to monitor a voltage of the wireless power receiver, detect a trend in the monitored voltage, and select an overlap delay such that the plurality of switches are temporarily enabled at the same time, the overlap delay being selected based on the trend to maintain the rectified voltage level near the desired voltage level without exceeding the breakdown voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless power enabled apparatus, comprising:
a wireless power receiver, including; a receive coil; a rectifier including a plurality of switches configured to receive a power signal generated from the receive coil and generate an output power signal at a rectified voltage level, wherein a voltage level of the power signal has a wide range based on a varying coupling quality of the wireless power receiver, and wherein the plurality of switches enter a breakdown state when the rectified voltage level reaches a breakdown voltage level that is less than or equal to 1.6 times a desired voltage level; and control logic configured to control the plurality of switches within the rectifier to have an overlap delay, the overlap delay being selected in response to detecting a trend in a monitored voltage level to maintain the rectified voltage level near the desired voltage level without exceeding the breakdown voltage level. - View Dependent Claims (12, 13, 14)
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15. A method of operating a receiver side of a wireless power transfer system, the method comprising:
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generating an output power signal including a rectified voltage and a rectified current responsive to receiving a wireless power signal, the rectified voltage being generated from a power signal that varies among a range of values during operation, wherein a high end of the range is greater than a desired voltage of the output power signal; monitoring the rectified voltage; detecting a trend in the monitored rectified voltage; and controlling a rectifier according to at least one mode including a power modulation mode modulating the output power signal to have an overlap delay such that a plurality of switches in the rectifier are temporarily enabled at the same time, the overlap delay being selected based on the detected trend to maintain the rectified voltage at less than or equal to 1.6 times the desired voltage to prevent the rectifier from entering a breakdown state. - View Dependent Claims (16, 17, 18)
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Specification