WIRELESS POWER SYSTEM AND METHOD
First Claim
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1. A wireless power system comprising:
- a transmitting circuit that includes an inductor configured to generate a magnetic field to provide power to a receiver; and
a drive controller that provides a switching control signal to drive the transmitting circuit, the drive controller configured to adjust frequency and/or duty cycle of the switching control signal to adjust the power generated and provided to the receiver by the transmitting circuit through the inductor to a desired power in response to a control signal from the receiver, the drive controller adjusting the duty cycle to achieve the desired power unless the adjustment of the duty cycle causes the duty cycle to be outside of a predefined duty cycle range and adjusting the frequency to achieve the desired power if the adjustment of the duty cycle causes the duty cycle to be outside of the predefined duty cycle range.
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Abstract
A wireless power system and method are provided that employ a hybrid approach to adjusting transmission power to take advantages of the best features of frequency mode adjusting and duty cycle mode adjusting. The wireless system and method attempt to modify duty cycle as a first adjustment, unless the duty cycle adjustment causes the duty cycle to be outside a predefined range. If the duty cycle adjustment causes the duty cycle to be outside a predefined range, the wireless system and method employ frequency mode adjusting to adjust transmission power.
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Citations
20 Claims
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1. A wireless power system comprising:
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a transmitting circuit that includes an inductor configured to generate a magnetic field to provide power to a receiver; and a drive controller that provides a switching control signal to drive the transmitting circuit, the drive controller configured to adjust frequency and/or duty cycle of the switching control signal to adjust the power generated and provided to the receiver by the transmitting circuit through the inductor to a desired power in response to a control signal from the receiver, the drive controller adjusting the duty cycle to achieve the desired power unless the adjustment of the duty cycle causes the duty cycle to be outside of a predefined duty cycle range and adjusting the frequency to achieve the desired power if the adjustment of the duty cycle causes the duty cycle to be outside of the predefined duty cycle range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power system comprising:
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a receiver; a load coupled to the receiver, such that the power to the receiver is provided to power the load and/or charge a battery associated with the load; and a transmitter comprising; a transmitting circuit that includes an inductor configured to generate a magnetic field to provide power to the receiver; and a drive controller that provides a switching control signal to drive the transmitting circuit, the drive controller configured to adjust frequency and/or duty cycle of the switching control signal to adjust the power generated and provided to the receiver by the transmitting circuit through the inductor to a desired power in response to a control error signal from the receiver that provides an indication between the desired power and actual power received by the load, the drive controller adjusting the duty cycle to achieve the desired power unless the adjustment of the duty cycle causes the duty cycle to be outside of a predefined duty cycle range and the controller sets the duty cycle to a preset duty cycle and adjusts the frequency to achieve the desired power if the adjustment of the duty cycle causes the duty cycle to be outside of the predefined duty cycle range. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for providing wireless power, the method comprising:
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setting an initial frequency and duty cycle of a switching control signal that drives a transmitting circuit that includes an inductor configured to generate a magnetic field to provide power to a receiver; receiving a control error signal from the receiver that provides an indication between a desired power and actual power received; adjusting the duty cycle of the switching control signal to achieve the desired power unless the adjustment of the duty cycle causes the duty cycle to be outside of a predefined duty cycle range; and adjusting the frequency of the switching control signal to achieve the desired power if the adjustment of the duty cycle causes the duty cycle to be outside of the predefined duty cycle range. - View Dependent Claims (17, 18, 19, 20)
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Specification