Inductive power transmission system and method for concurrently transmitting digital messages
First Claim
1. A control circuit for an inductive power outlet configured to transfer power to an inductive power receiver, said control circuit comprising:
- a resonant circuit connected to a primary coil configured to inductively couple with a secondary coil of said inductive power receiver, said resonant circuit having a characteristic resonant peak;
a frequency driver operable to provide a driving voltage across said primary coil, said driving voltage oscillating at an operating frequency higher than said characteristic resonant peak of the resonant circuit;
a magnitude detector operable to monitor primary coil voltage;
a data demodulator operable to detect modulated peaks in primary coil voltage indicating that a communications modulator of said inductive power receiver has transitioned from a first state to a second state, to determine a characteristic frequency of said peaks and thereby to extract modulated data sent in communication signals from said inductive power receiver.
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Accused Products
Abstract
A control circuit for an inductive power outlet configured to transfer power to an inductive power receiver includes a resonant circuit having a characteristic resonant peak and connected to a primary coil configured to inductively couple with a secondary coil of the inductive power receiver, a frequency driver operable to provide a driving voltage oscillating at an operating frequency higher than the characteristic resonant peak of the resonant circuit across the primary coil, a magnitude detector operable to monitor primary coil voltage, and a data demodulator operable to detect modulated peaks in primary coil voltage indicating that a communications modulator of the inductive power receiver has transitioned from a first state to a second state. The communications modulation determines a characteristic frequency of the peaks and extracts modulated data sent in communication signals from the inductive power receiver.
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Citations
20 Claims
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1. A control circuit for an inductive power outlet configured to transfer power to an inductive power receiver, said control circuit comprising:
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a resonant circuit connected to a primary coil configured to inductively couple with a secondary coil of said inductive power receiver, said resonant circuit having a characteristic resonant peak; a frequency driver operable to provide a driving voltage across said primary coil, said driving voltage oscillating at an operating frequency higher than said characteristic resonant peak of the resonant circuit; a magnitude detector operable to monitor primary coil voltage; a data demodulator operable to detect modulated peaks in primary coil voltage indicating that a communications modulator of said inductive power receiver has transitioned from a first state to a second state, to determine a characteristic frequency of said peaks and thereby to extract modulated data sent in communication signals from said inductive power receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An inductive power outlet configured to transfer power to an inductive power receiver said inductive power outlet comprising:
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a resonant circuit connected to a primary coil configured to inductively couple with a secondary coil of said inductive power receiver, said resonant circuit having a characteristic resonant peak; a frequency driver operable to provide a driving voltage across said primary coil, said driving voltage oscillating at an operating frequency higher than said characteristic resonant peak of the resonant circuit; a magnitude detector operable to monitor primary coil voltage; a data demodulator operable to detect modulated peaks in primary coil voltage indicating that a communications modulator of said inductive power receiver has transitioned from a first state to a second state, to determine a characteristic frequency of said peaks, and thereby to extract modulated data sent in communication signals from said inductive power receiver; and a detection unit operable to detect placement of an inductive power receiver on said inductive power outlet. - View Dependent Claims (16, 17)
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18. A method for transferring power inductively from an inductive power outlet to an inductive power receiver, said inductive power transmitter having a primary coil, a resonant circuit, a frequency driver, a magnitude detector, and a data demodulator, said method comprising:
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said inductive power outlet transmitting a ping signal; said inductive power outlet receiving a valid signal response; said frequency driver providing a driving voltage across said primary coil, said magnitude detector monitoring primary coil voltage; said data demodulator extracting modulator from communication signals sent from said inductive power receiver; said frequency driver increasing power level if said data modulator detects a power increase signal; said frequency driver decreasing power level if said data modulator detects a power decrease signal; and said frequency driver terminating power transmission if said data modulator detects a termination signal. - View Dependent Claims (19, 20)
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Specification