Inductive power source and charging system

• US 9,577,440 B2
• Filed: 05/25/2011
• Issued: 02/21/2017
• Est. Priority Date: 01/31/2006
• Status: Active Grant

• Current Assignee: Mojo Mobility, Inc.
• Original Assignee: Mojo Mobility, Inc.
• Inventors: Partovi, Afshin, Sears, Michael
• Primary Examiner(s): Berhanu, Samuel
• APPLICATION: US 20110221385A1
• Time in patent office: 2099 Days
• Field of Search: 320/108, 320/150
• US Class Current: 1/1
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 5/003 Printed circuit coils
• CPC Class Codes: H02J 17/00 Systems for supplying or distributing electric power by electromagnetic waves
• 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 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/0029 with safety or protection devices or circuits
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/025 using non-contact coupling, e.g. inductive, capacitive

Abstract

A portable inductive power source, power device, or unit, for use in powering or charging electrical, electronic, battery-operated, mobile, and other devices is disclosed herein. In accordance with an embodiment the system comprises a pad or similar base unit that contains a primary, which creates an alternating magnetic field by means of applying an alternating current to a winding, coil, or any type of current carrying wire. A receiver comprises a means for receiving the energy from the alternating magnetic field from the pad and transferring it to a mobile or other device. In some embodiments the receiver can also comprise electronic components or logic to set the voltage and current to the appropriate levels required by the mobile device, or to communicate information or data to and from the pad. Embodiments may also incorporate efficiency measures that improve the efficiency of power transfer between the charger and receiver.

Claims

1. A mobile device capable of inductive powering or charging by a universal base unit for charging of different mobile devices and/or batteries of different charging characteristics associated therewith, comprising:

a battery, wherein one or both of a mobile device and the battery have particular charging characteristics associated therewith;

a receiver and receiver coil, for one of inductively powering the device or charging the battery in the mobile device, wherein the receiver is one of attached to or incorporated into the battery or the mobile device, and wherein the receiver coil has a generally planar shape so that a magnetic field received in a direction substantially perpendicular to the plane of the receiver coil is used to inductively generate a current in the receiver coil;

an identification component associated with the mobile device or battery, which is configured to provide wireless identification of the receiver to the universal base unit;

a means for avoiding overcharging one or both of the mobile device and battery inductively; and

a regulator, coupled to the output of the receiver or to the battery, that regulates an output voltage or output current provided by the receiver, to the mobile device or battery, to be within a range of parameters for the mobile device or the battery;

wherein different mobile devices and batteries can have different charging characteristics associated therewith; and

wherein the receiver communicates with the base unit to

detect, identify and authenticate the receiver with the base unit, as provided by the identification component,

determine and then activate one or more primary coils of the base unit which are aligned with the receiver coil,

verify the continued presence of the receiver near the base unit, and

communicate information describing the characteristics of the mobile device or the battery, for use by the base unit to provide power transfer to the receiver and to the mobile device and the battery according to their particular charging characteristics.

2. The mobile device of claim 1 further comprising a shell, wherein the receiver is attached to the shell.

3. A system for use with a mobile device for charging or powering the mobile device inductively by a universal base unit for charging of different mobile devices and/or batteries of different charging characteristics associated therewith, comprising:

a universal base unit including one or more primary coils therein, each primary coil having a generally planar shape so that when a current is passed through the primary coil a magnetic field is generated in a direction substantially perpendicular to the plane of the primary coil;

wherein the perpendicular magnetic field inductively generates a current in a matching secondary coil or coils within a mobile device placed close to and aligned with the base unit, to charge or power the mobile device;

wherein one or both of the mobile device and a battery have

a receiver and particular charging characteristics associated therewith,

an identification component associated with the mobile device or battery, which is configured to provide wireless identification of the receiver to the base unit,

a means for avoiding overcharging one or both of the mobile device and battery inductively, and

a regulator, coupled to the output of the receiver or to the battery, that regulates an output voltage or output current provided by the receiver, to the mobile device or battery, to be within a range of parameters for the mobile device or the battery;

wherein different mobile devices and batteries can have different charging characteristics associated therewith; and

wherein the receiver communicates with the base unit to

detect, identify and authenticate the receiver with the base unit, as provided by the identification component,

determine and then activate one or more primary coils of the base unit which are aligned with the receiver coil,

verify the continued presence of the receiver near the base unit, and

communicate information describing the characteristics of the mobile device or the battery, for use by the base unit to provide power transfer to the receiver and to the mobile device and the battery according to their particular charging characteristics.

4. The system of claim 3 wherein one or more of the coils are manufactured on printed circuit boards and are manufactured to have a low resistance.

5. The system of claim 3 wherein the base unit includes a primary circuit having a switch means for switching the primary coil on and off whenever the mobile device is placed close to the primary coil of the base unit or the presence of the mobile device is to be detected.

6. The system of claim 3 wherein the base unit includes multiple primary coils that can be used to simultaneously charge multiple mobile devices.

7. The system of claim 6 wherein the alternating switching is periodically started and stopped to automatically detect a presence of a mobile device placed close to or aligned with the primary coil of the base unit.

8. The system of claim 7 wherein the presence of the mobile device placed close to or aligned with the primary coil of the base unit is detected by monitoring the current passing through the primary coil or the switching means.

9. The system of claim 3 wherein the base unit is in the shape generally of a pad and wherein the multiple primary coils are distributed within layers of the pad.

10. The system of claim 9 wherein the multiple primary coils can move within their plane to more closely align with the secondary coil of a mobile device.

11. The system of claim 3 wherein a magnet is placed at the center of each primary, wherein the magnet at the center of each primary has a magnetic axis that is perpendicular to the plane of the coil, and wherein one or more of the devices to be charged include a magnet at the center of their receiver coil, so that the magnets in the devices and the magnets in the base are oriented to attract each other when a coil in a device is placed directly on top of a coil in the base.

12. The system of claim 3 further comprising a battery coupled to and powering the base unit, and wherein the battery can be occasionally charged by an external power supply or solar cell to maintain a charge sufficient to power the inductive device for a period of time.

13. The system of claim 3, further comprising a data storage component for storage of data, for subsequent transmission of data to or from the mobile device.

14. The system of claim 3 wherein the cover surface of the base unit or pad includes a decorative or non-slip surface.

15. The system of claim 3 wherein the base unit can be integrated into any of briefcases, bags, or clothing.

16. The system of claim 3 wherein the base unit is integrated into a charging kiosk for occasional charging of mobile devices.

17. The system of claim 3 wherein one or more of the primary coils are stacked to improve transfer efficiency.

18. The system of claim 3, further comprising a plurality of coils or wires, wherein the charger or power supply senses the location of the mobile device and activates a coil or wire near the mobile device to charge or provide power the mobile device.

19. The system of claim 18, wherein the charger or power supply senses the location of the mobile device by sensing a change in a resonant circuit in the charger or power supply when the mobile device is nearby.

20. The system of claim 3, wherein the mobile device includes an inductively charged battery where a receiver for the inductive power is made of flexible PCB material and can be shaped into a curve to fit the battery, an application or a device.

21. The system of claim 3, wherein the charger or power supply is made in the shape of a cup, bowl, or other container and mobile devices placed inside would be charged or powered inductively.

22. The system of claim 3, wherein a plurality of modular chargers or power supplies can be interconnected to form a single unit.

23. The system of claim 3, wherein the mobile device is one of a kitchen appliance or dish, or a toy that can receive power inductively from the charger or power supply.

24. The system of claim 3, wherein the mobile device is a charger for inductively charging active RFID batteries, including an active RFID tag which includes a battery such that the battery can be charged inductively with the system.

25. The system of claim 3, wherein the mobile device to be charged or powered includes a charging circuit having a Zener diode, wherein the Zener diode clamps the voltage to the mobile device to a predetermined maximum voltage.

26. The system of claim 3, wherein, the mobile device includes an after-market or field-replaceable battery pack compatible with an original battery pack for the device, and wherein the matching secondary coil or coils within the mobile device are incorporated into the after-market or field-replaceable battery pack.

27. A system capable of inductive powering or charging by a universal base unit for charging of different mobile devices and/or batteries of different charging characteristics associated therewith, comprising:

a battery, wherein one or both of a device and the battery have particular charging characteristics associated therewith;

a receiver and receiver coil, for one of inductively powering the device or charging the battery in the device, wherein the receiver is one of attached to or incorporated into the battery or the device, and wherein the receiver coil has a generally planar shape so that a magnetic field received in a direction substantially perpendicular to the plane of the receiver coil is used to inductively generate a current in the receiver coil;

an identification component associated with the device or battery, which is configured to provide wireless identification of the receiver to the universal base unit;

a means for avoiding overcharging one or both of the mobile device and battery inductively; and

a regulator, coupled to the output of the receiver or to the battery, that regulates an output voltage or output current provided by the receiver, to the device or battery, to be within a range of parameters for the device or the battery;

wherein different devices and batteries can have different charging characteristics associated therewith; and

wherein the receiver communicates with the base unit to

detect, identify and authenticate the receiver with the base unit, as provided by the identification component,

determine and then activate one or more primary coils of the base unit which are aligned with the receiver coil,

verify the continued presence of the receiver near the base unit, and

communicate information describing the characteristics of the device or the battery, for use by the base unit to provide power transfer to the receiver and to the device and the battery according to their particular charging characteristics.

28. The system of claim 27 wherein the system is included within an automobile.