System and method for triggering power transfer across an inductive power coupling and non resonant transmission
First Claim
1. A method of triggering power transmission in an inductively coupled power transmission system comprising:
- a. waiting a time duration;
b. electrically exciting a primary coil in a power transmitter;
c. receiving a signal indicative of resonance properties of said primary coil;
d. determining if a secondary coil in a power receiver is inductively coupled to said primary coil by;
determining a change in effective inductance of said primary coil;
determining a change in effective resistance of said primary coil; and
determining a match between;
values indicative of effective inductance of said primary coil, and values indicative of effective resistance of said primary coil; and
at least one set of values associated with a primary coil inductively coupled to a secondary coil; and
e. triggering power transmission from said primary coil to said secondary coil if said secondary coil is inductively coupled to said primary coil, or repeating steps a-d if said secondary coil is not inductively coupled to said primary coil.
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Accused Products
Abstract
A triggerable power transmitter for power transmission from a primary coil to an inductively coupled secondary coil in a power receiver has a primary coil; a driver for electrically driving the primary coil; a front end receiving analog signal indicative of resonance properties of the primary coil and generating digital information in response to the analog signal; and a processor capable of: determining if said primary coil is coupled to a secondary coil based on the digital information, and triggering power from the primary coil to said secondary coil when said primary coil is inductively coupled to said secondary coil. The effective inductance of the primary coil increases reducing the resonance frequency when a secondary coil is inductively coupled to the primary coil. However, foreign material such as a metal sheet placed on the primary coil increases the effective resistance thus shortening the decay time of the resonance.
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Citations
18 Claims
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1. A method of triggering power transmission in an inductively coupled power transmission system comprising:
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a. waiting a time duration; b. electrically exciting a primary coil in a power transmitter; c. receiving a signal indicative of resonance properties of said primary coil; d. determining if a secondary coil in a power receiver is inductively coupled to said primary coil by; determining a change in effective inductance of said primary coil; determining a change in effective resistance of said primary coil; and determining a match between;
values indicative of effective inductance of said primary coil, and values indicative of effective resistance of said primary coil; andat least one set of values associated with a primary coil inductively coupled to a secondary coil; and e. triggering power transmission from said primary coil to said secondary coil if said secondary coil is inductively coupled to said primary coil, or repeating steps a-d if said secondary coil is not inductively coupled to said primary coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A triggerable power transmitter for power transmission from a primary coil in the power transmitter to an inductively coupled secondary coil in a power receiver comprising:
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a primary coil, capable of being inductively coupled to a secondary coil in a power receiver; a driver, capable of electrically driving said primary coil; a front end, capable of receiving analog signal indicative of resonance properties of said primary coil and capable of generating digital information in response to said analog signal; and a processor, receiving said digital information and capable of; determining if said primary coil is coupled to a secondary coil based on said digital information by; determining a change in effective inductance of said primary coil; determining a change in effective resistance of said primary coil; and determining a match between;
values indicative of effective inductance of said primary coil, and values indicative of effective resistance of said primary coil; and
at least one set of values associated with a primary coil inductively coupled to a secondary coil, andcontrolling said driver to transmit power from said primary coil to said secondary coil when said primary coil is inductively coupled to said secondary coil. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification