Inductive power transmission system and method for concurrently transmitting digital messages
First Claim
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1. A control circuit for an inductive power receiver, comprising:
- a resonant circuit connected to a secondary coil configured to inductively couple with a primary coil of an inductive power outlet, said resonant circuit having a characteristic resonant peak at a frequency lower than an operational frequency of the inductive power outlet such that operating at a higher frequency reduces the amount of power transferred;
a rectifier;
a rectified current sense;
a communication and control unit operable to communicate power control instructions to the inductive power outlet comprising;
at least one communications modulator operable to create at least a first state and a second state such that transitioning from said first state to said second state produces a detectable change at the primary coil of the inductive power outlet; and
at least one signal generator operable to generate communication signals comprising a series of pulses generated at a characteristic frequency f.
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Abstract
An inductive power receiver including a resonant circuit, a rectifier, a rectified current sense, and a communication and control unit includes a communications modulator and at least one signal generator operable to generate a set of communication signals including a series of pulses generated at characteristic frequencies. Communication signals provide instructions for an inductive power outlet to regulate power transfer to the inductive power receiver.
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Citations
27 Claims
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1. A control circuit for an inductive power receiver, comprising:
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a resonant circuit connected to a secondary coil configured to inductively couple with a primary coil of an inductive power outlet, said resonant circuit having a characteristic resonant peak at a frequency lower than an operational frequency of the inductive power outlet such that operating at a higher frequency reduces the amount of power transferred; a rectifier; a rectified current sense; a communication and control unit operable to communicate power control instructions to the inductive power outlet comprising; at least one communications modulator operable to create at least a first state and a second state such that transitioning from said first state to said second state produces a detectable change at the primary coil of the inductive power outlet; and at least one signal generator operable to generate communication signals comprising a series of pulses generated at a characteristic frequency f. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for transferring power inductively from an inductive power outlet to an inductive power receiver having a resonant circuit including a secondary coil configured to inductively couple with a primary coil of the inductive power outlet, the resonant circuit having a characteristic resonant peak at a frequency lower than an operational frequency of the inductive power outlet such that operating at a higher frequency reduces the amount of power transferred, the inductive power receive also including a rectifier, a rectified current sense, and a communication and control unit operable to communicate power control instructions to the inductive power outlet, the inductive power outlet including at least one communications modulator operable to create at least a first state and a second state such that transitioning from said first state to said second state produces a detectable change at the primary coil of the inductive power outlet, and at least one signal generator operable to generate communication signals comprising a series of pulses generated at a characteristic frequency f;
- the method comprising;
detecting an activation voltage induced across said secondary inductive coil of the inductive power receiver; sending an identification signal from the inductive power receiver using the communication and control unit for receipt by the inductive power outlet; receiving power vie the secondary coil of the inductive power receiver; comparing secondary coil voltage of the inductive power receiver to reference values using a regulator of the inductive power receiver; and periodically sending at least one instruction signal from the communication and control unit of the inductive power receiver for receipt by the inductive power outlet during power transfer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
- the method comprising;
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21. A method for transferring power inductively from an inductive power outlet to an inductive power receiver, comprising:
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detecting an activation voltage induced across a secondary inductive coil of said inductive power receiver; said inductive power receiver sending an identification signal to the inductive power outlet; said inductive power receiver receiving power from said inductive power outlet; a regulator of said inductive power receiver comparing secondary voltage to reference values; and during power transfer said inductive power receiver periodically sending at least one instruction signal to the inductive power outlet. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification