Wireless power transmitter with multilayer printed circuit
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 transmitting coil comprising a multilayer printed circuit disposed on a non-conductive substrate, wherein vias are disposed along a length of said transmitting coil to connect conductors on different layers, and wherein said vias are configured to reduce skin effect losses and proximity effect losses when said power transmitter is used to wirelessly transmit electric power to a receiver;
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 determined, 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.
1 Assignment
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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.
40 Citations
23 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 transmitting coil comprising a multilayer printed circuit disposed on a non-conductive substrate, wherein vias are disposed along a length of said transmitting coil to connect conductors on different layers, and wherein said vias are configured to reduce skin effect losses and proximity effect losses when said power transmitter is used to wirelessly transmit electric power to a receiver; 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 determined, 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, 12, 13, 14, 15)
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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 comprising a multilayer printed circuit disposed on a non-conductive substrate, wherein vias are disposed along a length of said transmitting coil to connect conductors on different layers, and wherein said vias are configured to reduce skin effect losses and proximity effect losses when said transmitting coil is used to wirelessly transmit electric power to a receiver; a second feedback signal obtained from a terminal of said inductor, wherein a control feedback signal is determined, 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, 16, 17, 18, 19, 20, 21)
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22. A method of manufacturing a wireless electric power transmitter having a printed circuit transmitting coil, the method comprising:
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forming a transmitting coil by; providing a printed circuit board having a plurality of copper layers disposed on different layers of a non-conductive substrate, wherein a thickness of each, of the plurality of copper layers is less than or equal to about 34 μ
m;forming a conductive loop using at least one of the plurality of copper layers; and creating a plurality of vias disposed along a length of the conductive loop, wherein the plurality of vias are configured to electrically connect conductors on the different layers, and wherein the electrical connections between different layers are configured to provide impedance matching; operatively connecting an electronically-controlled switch to the transmitting coil, wherein the electronically-controlled switch is configured to direct current through the transmitting coil when the switch is closed; and operatively connecting a pulse width modulation control circuit to control the electronically-controlled switch, wherein the pulse width modulation control circuit is configured to operate the transmitting coil at frequencies selected to produce strong resonance coupling between the transmitting coil and a receiving coil, and wherein the frequencies are selected at least in part based on a distance between the transmitting coil and the receiving coil. - View Dependent Claims (23)
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Specification