TUNABLE SYNCHRONOUS RECTIFIER

• US 20130062967A1
• Filed: 09/14/2012
• Published: 03/14/2013
• Est. Priority Date: 09/14/2011
• Status: Active Grant

• Current Assignee: Triune Systems, LLC (Semtech Corporation)
• Original Assignee: Triune Ip, LLC (Semtech Corporation)
• Inventors: Teggatz, Ross E., Atrash, Amer H., Knight, Jonathan R.
• Granted Patent: US 9,553,457 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

A system for power transfer is provided. In one exemplary embodiment, the system includes an inductive power device, such as a device that transmits or receives power over an inductive coupling. For example, an adjustable impedance is coupled to the inductive power device, where the adjustable impedance is used for dynamically controlling the power gain in the inductive power device, such as by damping power generated by circuit impedances, such as inductances, capacitances or resistances, and combinations thereof.

Claims

1. A system for power transfer comprising:

an inductive power device; and

an adjustable impedance coupled to the inductive power device, the adjustable impedance for dynamically controlling the gain in the inductive power device.

2. The system of claim 1 further comprising a receiver coupled to the inductive power device, wherein the receiver is configured to receive a power signal and generate a control signal for the adjustable impedance in response to the power signal.

3. The system of claim 2 wherein the receiver further comprises a power monitor for determining whether optimized power is present in the load.

4. The system of claim 3 wherein the power monitor further comprises a current and voltage monitor.

5. The system of claim 1 further comprising a transmitter coupled to the inductive power device, wherein the transmitter is configured to transmit a power signal and receive a control signal for the adjustable impedance in response to the power signal.

6. The system of claim 1 further comprising an impedance controller for setting an impedance value of the adjustable impedance.

7. The system of claim 6 wherein the impedance controller is configured to vary the adjustable impedance based on an algorithm so as to optimize the impedance value of the adjustable impedance to reduce ringing without excessive attenuation of a received signal.

8. The system of claim 6 wherein the impedance controller is configured to periodically determine whether ringing is present in a received power signal and to adjust the impedance value of the adjustable impedance to reduce the ringing.

9. The system of claim 6 wherein the impedance controller is configured to periodically determine whether optimized power is present in a received power signal and to adjust the impedance value of the adjustable impedance to reduce attenuation of the received power signal.

10. The system of claim 1 wherein the inductive power device comprises one of a cellular telephone, a computer device, a meter reading data, a computer peripheral, a camera, a portable storage device, a calculator or a telemetry device.

11. A system for power transfer comprising:

an inductive power device, the inductive power device including a plurality of coupling inductances and a plurality of capacitances;

an adjustable impedance coupled to the inductive power device, the adjustable impedance for controlling power gain in the inductive power device, wherein the optimized power to the load is generated by one or more of the plurality of coupling inductances and the plurality of capacitances;

a receiver coupled to the inductive power device, wherein the receiver is configured to receive a power signal and generate a control signal for the adjustable impedance in response to the power signal;

a power monitor for determining whether optimized power is present at the load; and

an impedance controller for setting an impedance value of the adjustable impedance, wherein the impedance controller comprising means for varying the adjustable impedance to optimize the impedance value of the adjustable impedance to reduce ringing without excessive attenuation of a received signal.

12. A method for receiving power comprising:

receiving a power signal at an inductive power device; and

dynamically adjusting an impedance value of an adjustable impedance circuit coupled to the inductive power device to control power gain in the inductive power device.

13. The method of claim 12 further comprising generating a control signal for adjusting the adjustable impedance in response to the power signal.

14. The method of claim 13 further comprising:

determining whether ringing is present in the power signal after adjusting the adjustable impedance; and

modifying the control signal if ringing present in the power signal.

15. The method of claim 14 wherein determining whether ringing is present in the power signal comprises determining whether an optimized power is present in the power signal.

16. The method of claim 12 wherein dynamically adjusting the impedance value comprises adjusting the adjustable impedance circuit coupled to the inductive power device to control tuning in the inductive power device.

17. The method of claim 12 further comprising decreasing the adjustable impedance to reduce ringing.

18. The method of claim 12 further comprising increasing the adjustable impedance to reduce attenuation of the power signal.

19. The method of claim 12 comprising:

periodically determining whether optimized power is present in the power signal; and

adjusting the impedance value of the adjustable impedance to optimize power to the load.

20. The method of claim 12 comprising:

periodically determining whether ringing is present in the received power signal; and

adjusting the impedance value of the adjustable impedance to reduce attenuation of the received power signal if ringing is not present.