THREE-DIMENSIONAL ELECTROMAGNETIC FLUX FIELD GENERATION

• US 20080049372A1
• Filed: 08/23/2007
• Published: 02/28/2008
• Est. Priority Date: 08/23/2006
• Status: Abandoned Application

• Current Assignee: Bio AIM Technologies Holding Limited
• Original Assignee: Bio AIM Technologies Holding Limited
• Inventors: Loke, Siew Ling
• Application Number:
  US11/844,246
• Publication Number:
  US 20080049372A1
• Time in Patent Office: Days
• US Class Current: 361/143
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0071 with a programmable schedule

Abstract

A base system generates a three-dimensional magnetic flux field using, for example, a uniquely shaped magnetic material and winding arrangements that generate multi-frequency multi-directional fields such that their vector sum is the resultant of a power transference surface that sweeps three-dimensionally within the designated area. When a floating coil or winding arrangement together with the appropriate circuitry is placed in the vicinity of the field, the coupling and induction effect produces a current that flows in the conductor that forms the coil. Power can then be successfully transferred bounded by the resultant field regardless of its orientation or height. With the proliferation of Digital Signal Processing (DSP) technology in the Switched-Mode Power Supplies (SMPS) area, the electromagnetic fields can be controlled independently and therefore adaptive control becomes more feasible. This increases the benefits of three-dimensional magnetic flux generation.

Claims

1. An apparatus for providing wireless charging over a 3-dimensional space, the apparatus comprising:

at least 3 separate conductive windings, wherein each of the at least 3 separate conducive windings is configured to carry a separate electrical current for generation of a magnetic flux field over the 3-dimensional space; and

a control circuit coupled to the at least 3 separate conductive windings, the control circuit configured to generate at least 3 time-varying currents to be carried by the at least 3 separate conductive windings, wherein each of the at least 3 time-varying currents is operated at a different frequency from each other.

2. The apparatus of claim 1, wherein at least one of the currents generated by the control circuit is pulsed.

3. The apparatus of claim 1, wherein at least one of the currents generated by the control circuit is sinusoidal.

4. The apparatus of claim 1, further comprising a core of a magnetically permeable material, wherein at least one of the windings is wrapped around the core.

5. The apparatus of claim 1, wherein the control circuit is configured to generate the time-varying currents such that one of the currents is at a fundamental frequency and other currents are at integer multiples of the fundamental frequency.

6. The apparatus of claim 1, wherein a frequency for the time-varying currents is between about 10 kilohertz and 1 megahertz.

7. The apparatus of claim 1, wherein a fundamental frequency for the time-varying currents is at least 25 kilohertz.

8. The apparatus of claim 1, wherein the control circuit is configured to vary an amplitude of the time-varying currents for control of range.

9. A method for providing wireless charging over a 3-dimensional space, the method comprising:

providing at least 3 separate conductive windings, wherein each of the at least 3 separate conducive windings is configured to carry a separate electrical current for generation of a magnetic flux field over the 3-dimensional space; and

generating at least 3 time-varying currents for the at least 3 separate conductive windings, wherein each of the at least 3 time-varying currents is operated at a different frequency from each other.

10. The method of claim 9, further comprising generating at least one of the currents in a pulsed manner.

11. The method of claim 9, further comprising generating at least one of the currents in a sinusoidal manner.

12. The method of claim 9, wherein at least one of the windings is wrapped around a core of magnetically permeable material comprising at least one of ferrite, ferromagnetic, nanocrystalline, or powdered iron.

13. The method of claim 9, wherein the generating the time-varying currents such that one of the currents is at a fundamental frequency and other currents are at integer multiples of the fundamental frequency.

14. The method of claim 9, wherein a frequency for the time-varying currents is between about 10 kilohertz and 1 megahertz.

15. The method of claim 9, wherein a fundamental frequency for the time-varying currents is at least 25 kilohertz.

16. The method of claim 9, further comprising varying an amplitude of the time-varying currents for control of range.