Charging circuit for an energy store of a portable electrical device

1. A charging circuit for an energy store of a portable electrical device, comprising:

a first resonance switching circuit having

a first receiver coil for receiving an alternating magnetic field that induces in the first receiver coil an electric voltage, and

at least one further electrical component connected to at least one terminal of the first receiver coil,

wherein the first receiver coil and the at least one further electrical component with their impedances determine a resonance frequency (f0) of the first resonance switching circuit,

characterized by

at least one second resonance circuitry with

a second receiver coil for receiving an alternating magnetic field that induces in the second receiver coil an electric voltage, and

at least one further electrical component that is connected to at least one terminal of the second receiver coil,

wherein the second receiver coil and the at least one further electrical component with their impedances determine a resonance frequency (f1, fn) of the second resonance circuitry,

wherein the resonance frequency of the second resonance circuitry is an integer multiple of the resonance frequency of the first resonance switching circuit, and

wherein the receiver coils of the resonance circuitry are disposed such that during operation of the charging circuit they are permeated by the same magnetic field lines of the alternating magnetic field.

2. A charging circuit as in claim 1 , wherein at least two of the receiver coils comprise at least one winding of an electric line, wherein the electric lines of the at least two receiver coils extend parallel to one another and are supported by a common carrier.

3. A charging circuit as in claim 2 , wherein at least two of the receiver coils comprise each at least one winding of an electric line, wherein the electric line of at least one of the receiver coils over the entire course of the windings of their winding extends parallel to the electric line of the other receiver coil or at least of one of the other receiver coils.

4. A charging circuit as in claim 2 , wherein the electric lines of at least two of the receiver coils form a common spiral-shaped winding, wherein the electric lines extend next to one another in one winding plane of the spiral-shaped winding.

5. A charging circuit as in claim 4 , wherein the electric lines form two spiral-shaped windings and wherein the sections of the electric lines disposed in the interior of the two spiral-shaped windings are connected with one another such that a series circuit of the two spiral-shaped windings at the outside of the viral-shaped windings are electrically connected to further elements of the particular resonance switching circuits.

6. A portable electrical device comprising:

the charging circuit according to claim 1 ; and

an energy store,

wherein the energy store is electrically connected to the charging circuit, such that during reception of an alternating magnetic field through the receiver coils the electric voltage induced in the receiver coils generates a charging current that charges the energy store.

7. A configuration for charging an energy store of a portable electrical device, comprising:

the charging circuit of claim 1 ; and

a portable electrical device comprising said charging circuit and an energy store, wherein the energy store is electrically connected to the charging circuit, such that during reception of an alternating magnetic field through the receiver coils the electric voltage induced in the receiver coils generates a charging current that charges the energy store; and

a generation circuit for generating the alternating magnetic field.

8. A method for charging an energy store of a portable electrical device comprising the steps of:

receiving an alternating magnetic field and inducing an electric voltage through a first receiver coil, Wherein a resonance frequency (f0) during the induction of the electric voltage is determined through the impedances of the first receiver coil and at least of one further electrical component ( 63 , 64 ), which together form a first resonance switching circuit,

characterized by

receiving the same alternating magnetic field and inducing of an electric voltage through a second receiver coil, wherein a resonance frequency (f1, fn) is determined during the induction of the electric voltage through the impedances of the second receiver coil and at least of a further electrical component, which together form a second resonance circuitry,

wherein the resonance frequency of the second resonance circuitry is determined to an integer multiple of the resonance frequency of the first resonance switching circuit, and

wherein the receiver coils of the resonance circuitry are disposed such that during operation of the charging circuit they are permeated by the same magnetic field lines of the alternating magnetic field.

9. A method as in claim 8 , wherein, driven by the induced electric voltages of the first and of the second receiver coils, electric currents are each supplied across a rectifier connected to the first or the second resonance circuitry, are supplied to the energy store, wherein the rectifiers are connected in series and/or parallel to one another.

10. A method for the production of a charging circuit for an energy store of a portable electrical device, comprising the steps of:

forming a first resonance switching circuit, with a first receiver coil for receiving an alternating magnetic field which induces an electric voltage in the first receiver coil, and with at least one further electrical component which is connected to at least one terminal of the first receiver coil, wherein by determining the impedances of the first receiver coil and of the at least one further electrical component a resonance frequency (f0) of the first resonance switching circuit is determined,

forming a second resonance circuitry with a second receiver coil for receiving an alternating magnetic field which induces an electric voltage in the second receiver coil, and with at least one further electrical component which is connected to at least one terminal of the second receiver coil and wherein by determining the impedances of the second receiver coil and of the at least one further electrical component a resonance frequency (f1, fn) of the second resonance circuitry is determined,

wherein the resonance frequency of the second resonance circuitry is determined to an integer multiple of the resonance frequency of the first resonance switching circuit, and

wherein the receiver coils of the resonance circuitry are disposed such that during operation of the charging circuit these are permeated by the same magnetic field lines of the alternating magnetic field.

11. A charging circuit as in claim 3 , wherein the electric lines of at least two of the receiver coils form a common spiral-shaped winding, wherein the electric lines extend next to one another in one winding plane of the spiral-shaped winding.