Adaptive wireless power transfer system and method
First Claim
1. A system comprising:
- a monitoring function to monitor control parameters of a wall adapter or USB input source which has variable power limits that supplies power to a wireless power transmitter to determine that amount of power the input source can deliver to the wireless power transmitter, wherein the wireless power transmitter operates with a wireless power receiver to supply a charging current to a load; and
a controller in the transmitter configured to receive the control parameters from the monitoring function and to control an adjustable operating point for the wireless power transmitter which controls the charging current delivered to the load via the wireless power receiver to maintain power drawn from the input source within a predetermined range, wherein the controller commands a reduced power operating point for the wireless power transmitter when the input source to the wireless power transmitter is measured below a predetermined threshold, wherein the wireless transfer system automatically dynamically adjusts a receiver load line so that the input source does not shut down and the transmitter can still deliver power to the receiver wirelessly when the amount of power supplied by the input source is below the predetermined threshold.
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Abstract
A system for wireless power transfer is provided. The system includes a monitoring function to monitor control parameters and an input source that supplies power to a wireless power transmitter, wherein the wireless power transmitter operates with a wireless power receiver to supply a charging current to a load. A controller can be configured to receive the control parameters from the monitoring function and to control an adjustable operating point for the wireless power transmitter which controls the charging current delivered to the load via the wireless power receiver, wherein the controller commands a maximum power operating point for the wireless power transmitter when the input source is detected at or above a predetermined threshold and commands a reduced power operating point for the wireless power transmitter when the input source to the wireless power transmitter is detected below the predetermined threshold.
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Citations
20 Claims
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1. A system comprising:
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a monitoring function to monitor control parameters of a wall adapter or USB input source which has variable power limits that supplies power to a wireless power transmitter to determine that amount of power the input source can deliver to the wireless power transmitter, wherein the wireless power transmitter operates with a wireless power receiver to supply a charging current to a load; and a controller in the transmitter configured to receive the control parameters from the monitoring function and to control an adjustable operating point for the wireless power transmitter which controls the charging current delivered to the load via the wireless power receiver to maintain power drawn from the input source within a predetermined range, wherein the controller commands a reduced power operating point for the wireless power transmitter when the input source to the wireless power transmitter is measured below a predetermined threshold, wherein the wireless transfer system automatically dynamically adjusts a receiver load line so that the input source does not shut down and the transmitter can still deliver power to the receiver wirelessly when the amount of power supplied by the input source is below the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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monitoring a control parameter, via a processor, for an external variable wall adapter or USB input power source that supplies variable amounts of power in a wireless power transfer system; measuring, by the processor, input power capabilities of the external variable input power source by comparing the control parameter to a threshold; and automatically dynamically adjusting a power set point for a transmitter of the wireless power transfer system to adjust a receiver load line, by the processor, based on the measured input power capabilities of the variable external input power source, wherein the power set point is reduced when the variable input power source is determined to have limited power capabilities, wherein the variable power source does not shut down and power can still be delivered to the receiver when the amount of power supplies by the input source is below the predetermined threshold. - View Dependent Claims (13, 14, 15, 16)
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17. An integrated circuit comprising:
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a controller configured to monitor control parameters from a wall adapter or USB input source having variable power limits to control an adjustable operating point for a transmitter in the wireless power system to control a charging current delivered to a load in order to maintain power drawn from the input source within a predetermined range, so that the variable input source does not shut down wherein the controller commands a reduced power operating point for the wireless power system when the input source is measured below the predetermined threshold; an input circuit to provide the control parameters to the controller; and a lower power circuit to indicate the input source has a reduced power delivery capacity, wherein the integrated circuit automatically dynamically adjusts a receiver load line so that the transmitter can still deliver power to the receiver when the amount of power supplied by the input source is below the predetermined threshold. - View Dependent Claims (18, 19, 20)
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Specification