SYSTEM AND METHOD FOR WIRELESS POWER TRANSFER
First Claim
1. An efficient power transmitter, comprising:
- an electronically-controlled switch controlled by a first pulse width modulation control circuit, said switch configured to pull current through a first inductor when said switch is closed, said first pulse width modulation control circuit outputting a PWM output signal to control said switch;
a first feedback signal obtained from a control input of said switch; and
a second feedback signal obtained from a terminal of said inductor, wherein a control feedback signal is computed, at least in part, as a difference between said first feedback signal and said second feedback signal is provided to said first pulse width modulation control circuit, said control circuit adjusting a frequency of said PWM output signal, at least in part, in response to said control feedback.
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Accused Products
Abstract
A wireless transmission system having a transmitter and receiver is described. In one embodiment, the transmitter includes an electronically-controlled switch controlled by a first pulse width modulation control circuit, the switch configured to pull current through a first inductor when the switch is closed, the first pulse width modulation control circuit outputting a PWM output signal to control the switch. A first feedback signal obtained from a control input of the switch. A second feedback signal obtained from a terminal of the inductor, wherein a control feedback signal is computed, at least in part, as a difference between the first feedback signal and the second feedback signal is provided to the first pulse width modulation control circuit. In one embodiment, the receiver includes a second pulse with modulation controller, the second pulse width modulation controller controlling the receiver switch to deliver a desired power from the receiving coil to a load.
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Citations
11 Claims
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1. An efficient power transmitter, comprising:
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an electronically-controlled switch controlled by a first pulse width modulation control circuit, said switch configured to pull current through a first inductor when said switch is closed, said first pulse width modulation control circuit outputting a PWM output signal to control said switch; a first feedback signal obtained from a control input of said switch; and a second feedback signal obtained from a terminal of said inductor, wherein a control feedback signal is computed, at least in part, as a difference between said first feedback signal and said second feedback signal is provided to said first pulse width modulation control circuit, said control circuit adjusting a frequency of said PWM output signal, at least in part, in response to said control feedback. - View Dependent Claims (2, 3, 4, 5)
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6. An efficient wireless transmission system, comprising:
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a transmitter, comprising; an electronically-controlled switch controlled by a first pulse width modulation control circuit, said switch configured to pull current through a first inductor when said switch is closed, said first pulse width modulation control circuit outputting a PWM output signal to control said switch; a first feedback signal obtained from a control input of said switch; a transmitting coil; a second feedback signal obtained from a terminal of said inductor, wherein a control feedback signal is computed, at least in part, as a difference between said first feedback signal and said second feedback signal is provided to said first pulse width modulation control circuit, said control circuit adjusting a frequency of said PWM output signal, at least in part, in response to said control feedback; and a receiver, comprising; a receiving coil provided to a receiver switch; and a second pulse with modulation controller, said second pulse width modulation controller controlling said receiver switch to deliver a desired power from said receiving coil to a load. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification