CIRCUITRY FOR INDUCTIVE POWER TRANSFER
First Claim
1. Circuitry for use in a primary unit of an inductive power transfer system to generate an electromagnetic field so as to transfer power wirelessly by electromagnetic induction to one or more secondary units of the system, the or each secondary unit being separable from the primary unit, the circuitry comprising:
- a plurality of drivable portions, each portion comprising a primary coil or a dummy coil;
driving circuit operable to supply both or at least two of said portions with drive signals so as to cause those driven portions that have a said primary coil to generate said electromagnetic field; and
control circuit operable, in dependence upon a feedback signal indicative of a characteristic of the primary coil or dummy coil of one or more of the driven portions, to control the circuitry so as to tend to regulate said feedback signal,wherein the circuitry is configured so that;
those portions that are driven are connected together in parallel and have a tuned resonant response; and
said control tends to regulate such a characteristic of each of said driven coils.
1 Assignment
0 Petitions
Accused Products
Abstract
Circuitry for use in a primary unit of an inductive power transfer system to generate an electromagnetic field so as to transfer power wirelessly by electromagnetic induction to one or more secondary units of the system, the or each secondary unit being separable from the primary unit, the circuitry comprising: a plurality of drivable portions, each portion comprising a primary coil or a dummy coil; driving means operable to supply both or at least two of said portions with drive signals so as to cause those driven portions that have a said primary coil to generate said electromagnetic field; and control means operable, in dependence upon a feedback signal indicative of a characteristic of the primary or dummy coil of one or more of the driven portions, to control the circuitry so as to tend to regulate said feedback signal, wherein the circuitry is configured so that; those portions that are driven are connected together in parallel and have a tuned resonant response; and said control tends to regulate such a characteristic of each of said driven coils.
118 Citations
49 Claims
-
1. Circuitry for use in a primary unit of an inductive power transfer system to generate an electromagnetic field so as to transfer power wirelessly by electromagnetic induction to one or more secondary units of the system, the or each secondary unit being separable from the primary unit, the circuitry comprising:
-
a plurality of drivable portions, each portion comprising a primary coil or a dummy coil; driving circuit operable to supply both or at least two of said portions with drive signals so as to cause those driven portions that have a said primary coil to generate said electromagnetic field; and control circuit operable, in dependence upon a feedback signal indicative of a characteristic of the primary coil or dummy coil of one or more of the driven portions, to control the circuitry so as to tend to regulate said feedback signal, wherein the circuitry is configured so that; those portions that are driven are connected together in parallel and have a tuned resonant response; and said control tends to regulate such a characteristic of each of said driven coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 18, 19, 20, 21, 22, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 48)
-
-
14-17. -17. (canceled)
-
23-26. -26. (canceled)
-
41. Circuitry for use in a primary unit of an inductive power transfer system to generate a time-varying electromagnetic field so as to transfer power wireles sly by electromagnetic induction to a secondary unit of the system, the secondary unit being separable from the primary unit, the circuitry comprising:
-
a drivable portion comprising a primary coil; and driving circuit operable to supply the drivable portion with a drive signal having a predetermined fundamental frequency so as to cause the primary coil to generate said electromagnetic field, wherein; the drivable portion is configured such that, when driven it has a frequency response having two main resonant peaks and a substantially flat portion therebetween; and the driving circuit is configured such that said fundamental frequency is positioned in frequency between said main resonant peaks and in said flat portion. - View Dependent Claims (42)
-
-
43-47. -47. (canceled)
-
49. (canceled)
Specification