Coupled-coil power control for inductive power transfer systems
First Claim
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1. An inductive power transfer device including:
- a resonant circuit, having a power transfer coil and a power transfer capacitor;
a coupling coil, magnetically-coupled to the power transfer coil;
a variable impedance; and
a controller configured to determine the impedance value of the variable impedance based on predetermined criteria including;
substantially regulating power provided to a load;
tuning the resonant circuit resonant frequency substantially to a predetermined frequency;
adjusting a frequency of a magnetic field associated with the power transfer coil; and
/oradjusting an impedance reflected by the power transfer coil to a corresponding coupled power transfer coil.
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Abstract
An inductive power transfer device including: a resonant circuit, having a power transfer coil and a power transfer capacitor; a coupling coil, magnetically-coupled to the power transfer coil; a variable impedance; and a controller configured to determine the impedance value of the variable impedance based on predetermined criteria including: substantially regulating power provided to a load; tuning the resonant circuit resonant frequency substantially to a predetermined frequency; adjusting a frequency of a magnetic field associated with the power transfer coil; and/or adjusting an impedance reflected by the power transfer coil to a corresponding coupled power transfer coil.
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Citations
23 Claims
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1. An inductive power transfer device including:
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a resonant circuit, having a power transfer coil and a power transfer capacitor; a coupling coil, magnetically-coupled to the power transfer coil; a variable impedance; and a controller configured to determine the impedance value of the variable impedance based on predetermined criteria including; substantially regulating power provided to a load; tuning the resonant circuit resonant frequency substantially to a predetermined frequency; adjusting a frequency of a magnetic field associated with the power transfer coil; and
/oradjusting an impedance reflected by the power transfer coil to a corresponding coupled power transfer coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for controlling an inductive power receiver comprising:
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switching on a first switch a first time period after the current through a coupling coil goes from flowing in a second direction or a first direction to zero; switching on a second switch a second time period after the current through the coupling coil goes from flowing in the first direction or second direction to zero; switching off the first switch when the second switch switches on or at some point between the second switch switching on and the current through the coupling coil going from flowing in the second direction to zero; switching off the second switch when the first switch switches on or at some point between the first switch switching on and the current through the coupling coil going from flowing in the first direction to zero; and controlling the duration of the first time period and the second time period to regulate the power provided to a load.
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Specification