POWER SYSTEM

• US 20140339916A1
• Filed: 08/01/2014
• Published: 11/20/2014
• Est. Priority Date: 10/03/2008
• Status: Active Grant

• Current Assignee: Philips IP Ventures B.V. (Koninklijke Philips N.V.)
• Original Assignee: Access Business Group International LLC (Alticor Incorporated)
• Inventors: Fells, Julian Andrew John, Baarman, David W.
• Granted Patent: US 9,577,437 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: G01V 3/10 using induction coils
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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: H02M 3/28 using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The present invention provides methods and apparatus for reducing power consumption. One method includes detecting the presence of an object, identifying whether the object is a valid device and restricting power if it is not a valid device. Another method includes temporarily applying a low amount of power to the primary unit to detect a load, supplying more power to determine if it is a valid secondary device, and restricting power if it is not. An apparatus for reducing power consumption includes two power inputs, where the lower power input powers a sense circuit. A switch selectively decouples the higher power input from the primary subcircuit during detection mode and couples the higher power input to the primary subcircuit during power supply mode.

Claims

1. A power system capable of transferring power to a portable device separable from the power system, the power system comprising:

a power supply for electrical connection to a mains voltage and adapted to convert the mains voltage into a DC voltage; and

a wireless power unit electrically coupled to the power supply DC voltage, the wireless power unit being operable in a low-power detection mode to detect an object in proximity to the wireless power unit, the wireless power unit being further operable in a power supply mode to provide wireless power to an object in proximity to the wireless power unit,

wherein the power supply is adapted to interrupt the conversion of the mains voltage into the DC voltage during operation of the wireless power unit in the low-power detection mode, the power supply being further adapted to resume the conversion of the mains voltage into the DC voltage during operation of the wireless power unit in the power supply mode.

2. The power system of claim 1 wherein the power supply includes:

a mains input for electrical connection to a mains supply;

a rectifier coupled to the mains input to convert the mains voltage to the DC voltage; and

a switch to selectively isolate the rectifier from the mains input during operation of the wireless power unit in the low-power detection mode.

3. The power system of claim 1 wherein the wireless power unit includes:

a switching circuit for converting the power supply DC voltage into an AC voltage;

a sense circuit to detect an object in proximity to the wireless power unit; and

a primary coil to provide power to an object in the power supply mode.

4. The power system of claim 3 wherein the power supply includes an electrical energy storage device for providing power to the sense circuit of the wireless power unit.

5. The power system of claim 1 wherein the wireless power unit consumes less power during the detection mode than during the power supply mode.

6. The power system of claim 1 wherein the power supply includes a DC output and a control input, the DC output and the control input being electrically coupled to the wireless power unit through at least one cable.

7. A power supply for electrical connection to a device, the power supply comprising:

a mains input for electrical connection to a mains supply;

a rectifier coupled to the mains input to convert the mains supply to a DC voltage;

a DC output to provide the DC voltage to the device; and

a switch disposed between the mains input and the rectifier to selectively interrupt the supply of power from the mains input to the rectifier.

8. The power supply of claim 7 further including a control input from the device to the switch.

9. The power supply of claim 7 further including an electrical energy storage device to provide a secondary power source to the device.

10. The power supply of claim 7 further including a cable to electrically connect the DC output to the device.

11. A power supply system comprising:

a device including a DC input; and

a power supply including a rectifier to convert mains power into DC power for the DC input, the power supply including a switch to selectively allow the supply of mains power to the rectifier in response to a control input from the device.

12. The power supply system of claim 11 wherein the device is operable to provide the control input in response to a stimulus.

13. The power supply system of claim 12 wherein the stimulus is provided from at least one of a receiver, a sensor, or a timer.

14. The power supply system of claim 11 wherein the device includes an energy storage unit to provide a secondary source of power when the device is in a standby state.

15. The power supply system of claim 11 wherein the power supply includes an energy storage unit to provide a secondary source of power when the device is in a standby state.

16. The power supply system of claim 11 wherein the device is a wireless power unit including:

a switching circuit for converting DC power into AC power;

a sense circuit to detect an object in proximity to the wireless power unit; and

a primary coil to provide wireless power to the object in response to detection of the object in proximity to the wireless power unit.

17. The power system of claim 16 wherein the wireless power unit is programmed to operate the primary coil in a detection mode and a power supply mode, wherein the wireless power unit consumes less power during the detection mode than during the power supply mode.

18. The power supply system of claim 17 wherein an electrical energy storage device provides electrical power to the wireless power unit during the detection mode.

19. The power supply system of claim 16 wherein the wireless power unit is further programmed to operate the primary coil in an identification mode.

20. The power supply system of claim 16 wherein the sense circuit includes at least one of a hall sensor, a reed switch, a motion sensor, a switch, a pressure sensor, and a light sensor.