Device with integrated wireless power receiver configured to make a charging determination based on a level of battery life and charging efficiency

• US 9,590,444 B2
• Filed: 05/01/2010
• Issued: 03/07/2017
• Est. Priority Date: 11/30/2009
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Walley, John, Karaoguz, Jeyhan, Rofougaran, Ahmadreza (Reza), Seshadri, Nambirajan, Van Der Lee, Reinier
• Primary Examiner(s): Fantu, Yalkew
• Assistant Examiner(s): HERNANDEZ, MANUEL J
• Application Number:
  US12/772,204
• Publication Number:
  US 20110127951A1
• Time in Patent Office: 2,502 Days
• Field of Search: 320/108
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A device includes an integrated power receive circuit, a battery charger, a battery, a processing module, one or more input/output modules, and one or more circuit modules. The integrated power receive circuit is operable to generate a DC voltage from a received magnetic field in accordance with a control signal. The battery charger is operable to convert the DC voltage into a battery charge voltage. The battery is coupled to the battery charger in a first mode and is coupled to supply power in a second mode. The processing module is operable to: generate the control signal based on desired electromagnetic properties of at least one of the received magnetic field and the integrated power receive circuit; process outbound data to produce processed outbound data; and process inbound data to produce processed inbound data.

Claims

1. An integrated circuit (IC) for using a device, the IC comprises:

a processing module configured to;

generate a control signal based on desired electromagnetic properties of a received magnetic field and an integrated power receive circuit;

provide the control signal to the integrated power receive circuit, wherein the control signal serves to tune the integrated power receive circuit;

determine a level of a battery that includes an amount of battery life left;

determine a charging efficiency for the received magnetic field;

analyze the determined level of the battery and the determined charging efficiency to make a charging determination, the charging determination based, at least in part, on a comparison of the determined level of the battery and the determined charging efficiency on a sliding scale basis, wherein for a given determined level of the battery a minimum pre-defined charging efficiency is indicated by the sliding scale basis, the value of the minimum pre-defined charging efficiency generally decreasing as the value of the given determined level of the battery decreases, and wherein the charging determination indicates that the battery is to be charged when the determined charging efficiency at least meets the minimum pre-defined charging efficiency corresponding to the determined level of the battery;

generate a battery charger control signal based on the charging determination, wherein the battery charger control signal is configured to cause charging of the battery in a first mode and decoupling of the battery from a battery charger in a second mode; and

provide the battery charger control signal to the battery charger to effect the first mode or the second mode.

2. The IC of claim 1, wherein the processing module is further configured to:

generate a DC to DC converter control signal; and

send the DC to DC converter control signal to a DC to DC converter.

3. The IC of claim 1 further comprises:

a power management module configured to control power consumption of the device; and

a clock generation module configured to generate one or more clock signals that are provided, as at least partially controlled by the power management module, to the processing module.

4. The IC of claim 1 further comprises:

the desired electromagnetic properties of the received magnetic field including at least one of frequency, interference avoidance, or magnetic coupling; and

the desired electromagnetic properties of the integrated power receive circuit including at least one of tuning, quality factor, impedance matching, or power level.

5. The IC of claim 1 further comprises:

a data processing module configured to process inbound and outbound control channel data.

6. A device comprises:

an integrated power receive circuit configured to generate a DC voltage from a received magnetic field, the integrated power receive circuit tuned with a control signal relating to desired electromagnetic properties of the received magnetic field;

a battery charger configured to convert the DC voltage into a battery charge voltage, the battery charger configured to be coupled to a battery in a first mode and decoupled from the battery in a second mode; and

a processing module configured to;

generate the control signal to tune the integrated power receive circuit based on the desired electromagnetic properties of the received magnetic field and the integrated power receive circuit;

determine a level of the battery that includes an amount of battery life left based on a battery type;

determine a charging efficiency for the received magnetic field;

analyze the determined level of the battery and the determined charging efficiency to make a charging determination, the charging determination based, at least in part, on a comparison of the determined level of the battery and the determined charging efficiency on a sliding scale basis, wherein for a given determined level of the battery a minimum pre-defined charging efficiency is established by the sliding scale basis, the value of the minimum pre-defined charging efficiency generally decreasing as the value of the given determined level of the battery decreases, and wherein the charging determination indicates that the battery is to be charged when the determined charging efficiency at least meets the minimum pre-defined charging efficiency corresponding to the determined level of the battery;

generate a battery charging control signal based on the charging determination; and

provide the battery charging control signal to the battery charger to effect either of the first mode or the second mode, wherein in the first mode the battery charging control signal functions to regulate charging of the battery based on the level of the battery, and wherein the battery is not charged in the second mode.

7. The device of claim 6 comprises:

a DC to DC converter operably coupled to the battery to generate one or more DC power supply voltages.

8. The device of claim 6 further comprises:

a power management module configured to control power consumption of the device; and

a clock generation module configured to generate one or more clock signals that are provided, as at least partially controlled by the power management module, to the processing module.

9. The device of claim 6 further comprises:

the desired electromagnetic properties of the received magnetic field including at least one of frequency, interference avoidance, or magnetic coupling; and

the desired electromagnetic properties of the integrated power receive circuit including at least one of tuning, quality factor, impedance matching, or power level.

10. The device of claim 6, wherein the integrated power receive circuit comprises:

a coil configured to generate an AC voltage from the received magnetic field;

an impedance matching and rectifying circuit operably coupled to the coil to generate a rectified voltage from the AC voltage, wherein at least one of the coil and the impedance matching and rectifying circuit are tuned in accordance with the control signal; and

a regulation module configured to generate the DC voltage from the rectified voltage in accordance with the control signal.

11. The device of claim 6 further comprises:

a housing that houses the integrated power receive circuit, the battery charger, the battery, and the processing module.

12. The device of claim 6, wherein the integrated power receive circuit comprises:

a coil configured to;

generate an AC voltage from the received magnetic field;

receive an inbound electromagnetic modulated signal; and

transmit an outbound electromagnetic modulated signal;

an impedance matching and rectifying circuit operably coupled to the coil to generate a rectified voltage from the AC voltage, wherein at least one of the coil and the impedance matching and rectifying circuit are tuned in accordance with the control signal;

a regulation module configured to generate the DC voltage from the rectified voltage in accordance with the control signal; and

a near field communication (NFC) transceiver operably coupled to;

convert outbound data into the outbound electromagnetic modulated signal; and

convert the inbound electromagnetic modulated signal into inbound data.

13. The device of claim 6, wherein the integrated power receive circuit comprises:

a coil configured to generate an AC voltage from the received magnetic field;

an impedance matching and rectifying circuit operably coupled to generate a rectified voltage from the AC voltage, wherein at least one of the coil and the impedance matching and rectifying circuit are tuned in accordance with the control signal, wherein the processing module is powered by the battery or an emergency DC supply voltage during an initial phase of generating the DC voltage;

a regulation module configured to generate the DC voltage from the rectified voltage in accordance with the control signal; and

an emergency power recovery module configured to generate the emergency DC supply voltage when the battery is not capable of powering the processing module.

14. The device of claim 13 further comprises:

after the initial phase of generating the DC voltage, powering the processing module from the DC voltage.

15. A device comprises:

a coil configured to convert a magnetic field into an AC voltage, wherein a wireless power transmit unit generates the magnetic field;

a capacitor coupled to the coil;

a rectifying circuit configured to convert the AC voltage into a DC rail voltage;

a DC to DC converter configured to convert the DC rail voltage into a DC voltage in accordance with a DC to DC converter control signal, the DC to DC converter configured to selectively couple a battery to be charged by the DC voltage and decouple the battery; and

a processing module configured to;

generate a control signal based on desired electromagnetic properties;

send the control signal to the coil and the capacitor, wherein the at least one of the coil and the capacitor are tuned in accordance with the control signal;

determine a level of the battery that includes an amount of remaining battery life;

determine a charging efficiency relating to the magnetic field;

generate a battery charger control signal to effect a mode of a plurality of modes based on the level of the battery and the battery charging efficiency, wherein the plurality of modes including coupling of the DC voltage to the battery to be charged in a first mode, and decoupling of the DC voltage from the battery to supply power in a second mode, wherein selection of the first mode or the second mode is based on a comparison of the determined level of the battery and the determined charging efficiency on a sliding scale basis, wherein for a given determined level of the battery a minimum pre-defined charging efficiency is established by the sliding scale basis, the value of the minimum pre-defined charging efficiency generally decreasing as the value of the given determined level of the battery decreases, and wherein the first mode is selected when the determined charging efficiency at least meets the minimum pre-defined charging efficiency corresponding to the determined level of the battery; and

generate the DC to DC converter control signal to achieve a desired voltage for the DC voltage; and

one or more input/output modules configured to at least one of;

route outbound data from the processing module to a peripheral output component;

or

route inbound data from a peripheral input component to the processing module.

16. The device of claim 15 further comprises:

an integrated circuit (IC) that supports the processing module, the one or more input/output modules, and at least a portion of at least one of the capacitor, the rectifying circuit, or the DC to DC converter.

17. The device of claim 15, wherein the processing module generates the DC to DC converter control signal to achieve a desired voltage for the DC voltage by at least one of:

generating a buck converter control signal or a boost converter control signal based on the DC voltage and battery charging requirements.

18. The device of claim 15 further comprises:

when the device is in the first mode of the plurality of modes, the processing module and the one or more input/output modules are powered by the battery; and

when the device is in the second mode of the plurality of modes, the processing module and the one or more input/output modules are powered by the DC voltage.

19. The device of claim 15 further comprises:

a power management module configured to control power consumption of the device.

20. The device of claim 15 further comprises:

a data processing module configured to process inbound and outbound control channel data.