Control circuit for wireless power

• US 9,755,456 B1
• Filed: 02/03/2014
• Issued: 09/05/2017
• Est. Priority Date: 02/01/2013
• Status: Active Grant

• Current Assignee: Greatbatch Limited (Greatbatch Incorporated)
• Original Assignee: Electrochem Solutions, Inc.
• Inventors: Peterson, Brian R., Jankins, Eric
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Shiao, David
• Application Number:
  US14/170,945
• Time in Patent Office: 1,310 Days
• Field of Search: None
• 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 9/061 for DC powered loads

Abstract

A power control circuit for wirelessly powering a device is described. The circuit comprises a series of sub-circuits that condition and modify electrical power received from near-field resonant inductive coupling. In addition, the power control circuit consists of a reserve power source of at least one capacitor. A switching circuit consisting of an ideal diode OR-ing circuit is provided that receives and selects between the primary and secondary electrical power sources based on their measured voltages.

Claims

1. An electrical power control circuit, comprising:

a) a resonator configured to receive an electrical power wirelessly transmitted by near-field resonant inductive coupling;

b) a primary power control circuit, comprising;

i) a conditioning circuit configured to modify the wirelessly received electrical power from an alternating current to a direct current electrical power, the conditioning circuit electrically connectable to the resonator; and

ii) a primary power supply circuit electrically connected to the conditioning circuit, the primary power supply circuit comprising a first voltage regulator circuit configured to modify a first voltage of the direct current electrical power from the conditioning circuit, wherein the primary power supply circuit is configured to output a primary electrical power having the first voltage to a primary power line;

c) a secondary power control circuit electrically connected to the primary power control circuit, the secondary power control circuit comprising;

i) a secondary electrical power source;

ii) a second voltage regulator circuit electrically connected to the secondary electrical power source, wherein the second voltage regulator circuit is configured to output a secondary electrical power having a second voltage from the secondary electrical power source to a secondary power line;

iii) a secondary electrical power charging circuit electrically connected to the secondary electrical power source and to the primary power line, wherein the secondary electrical power charging circuit is configured to electrically charge the secondary electrical power source with the primary electrical power; and

d) a switching circuit electrically connectable in parallel with the primary power line of the primary power control circuit and the secondary power line of the secondary power control circuit, the switching circuit comprising;

i) a first field effect transistor electrically connected to the primary power line;

ii) a second field effect transistor electrically connected to the secondary power line; and

iii) a switching controller configured to detect the first voltage at a first input of the first field effect transistor and the second voltage at a second input of the second field effect transistor; and

e) wherein, based on at least the detected first and second voltages, actuation of the switching controller causes either the first field effect transistor or the second field effect transistor to be configured to pass electrical current from the switching circuit to a third power line exiting the switching circuit.

2. The power control circuit of claim 1 wherein the first field effect transistor or the second field effect transistor having the greater of the detected first or second voltage is configured to pass electrical current from the switching circuit to the third power line exiting the switching circuit.

3. The power control circuit of claim 1 wherein the first field effect transistor or the second element field effect transistor having the lesser of the detected first or second voltage is configured to prevent passage of electrical current from the switching circuit to the third power line exiting the switching circuit.

4. The power control circuit of claim 1 wherein the secondary power source comprises at least one capacitor and/or at least one electrochemical cell.

5. The power control circuit of claim 1 wherein the conditioning circuit comprises an impedance matching circuit and a rectifying circuit.

6. The power control circuit of claim 1 wherein the first voltage regulator circuit comprises a first step-up or step-down voltage converter.

7. The power control circuit of claim 1 wherein the secondary electrical power charging circuit comprises a second step-up or step-down voltage converter.

8. The power control circuit of claim 1 wherein the second electrical power charging circuit comprises a current controller configured to modify a current of the primary electrical power.

9. The power control circuit of claim 1 wherein the second voltage regulator circuit comprises a third step-up or step-down voltage converter.

10. The power control circuit of claim 1 wherein the switching circuit comprises an ideal diode OR-ing circuit.

11. The power control circuit of claim 1 further comprising an auxiliary voltage regulator circuit electrically connectable to the switching circuit, wherein the auxiliary voltage regulator circuit comprises a fourth step-up or step-down voltage converter.

12. The power control circuit of claim 1 configured to be electrically connectable to a device selected from the group consisting of an electric motor, a sensor, and a radio.

13. The power control circuit of claim 1 wherein the first or second voltage ranges from 1V to 50V.

14. The power control circuit of claim 1 wherein the primary or secondary electrical power ranges from 1 watt to 2,000 watts.

23. The electrical power control system of claim 10 wherein the electrical device is selected from the group consisting of an electric motor, a sensor, and a radio.

15. An electrical power control circuit, comprising:

a) resonator configured to receive an electrical power wirelessly transmitted by near-field resonant inductive coupling;

b) a primary power control circuit, comprising;

i) an electrical impedance matching circuit and electrical rectifying circuit that are electrically connectable to the resonator, wherein the rectifying circuit is configured to modify the wirelessly received electrical power from an alternating current to a direct current electrical power; and

ii) a primary power supply circuit having a first voltage regulator electrically connected to the electrical impedance matching circuit and to the electrical rectifying circuit, wherein the first voltage regulator is configured to modify a first voltage of the direct current electrical power from the electrical rectifying circuit, and wherein the primary power supply circuit is configured to output a primary electrical power having the first voltage to a primary power line;

c) a secondary power control circuit electrically connected to the primary power control circuit, the secondary power control circuit comprising;

i) at least one capacitor or electrochemical cell;

ii) a secondary electrical power charging circuit electrically connected to the at least one capacitor or electrochemical cell and being electrically connectable to the primary power line, wherein the secondary power charging circuit is configured to charge the at least one capacitor or electrochemical cell with the primary electrical power; and

iii) a second voltage regulator circuit electrically connected to the at least one capacitor or electrochemical cell, wherein the second voltage regulator circuit is configured to output a secondary electrical power having a second voltage from the at least one capacitor or electrochemical cell to a secondary power line;

d) a switching circuit electrically connected to the primary power line of the primary power control circuit and to the secondary power line of the secondary power control circuit, the switching circuit comprising;

i) a first field effect transistor electrically connected to the primary power line;

ii) a second field effect transistor electrically connected to the secondary power line; and

iii) a switching controller configured to detect the first voltage at a first input of the first field effect transistor and the second voltage at a second input of the second field effect transistor; and

e) wherein, based on at least the detected first and second voltages, actuation of the switching controller causes either the first field effect transistor or the second field effect transistor to be configured to pass electrical current from the switching circuit to a third power line exiting the switching circuit.

16. The power control circuit of claim 15 wherein the first field effect transistor or the second field effect transistor having the greater of the detected first or second voltage is configured to pass electrical current from the switching circuit to the third power line exiting the switching circuit.

17. The power control circuit of claim 15 wherein the first or second voltage ranges from 1V to 50V.

18. The power control circuit of claim 15 wherein the primary or secondary electrical power ranges from 1 watt to 2,000 watts.

19. An electrical power control system, comprising:

a) an electrical device;

b) a receiving resonator electrically connected to the electrical device, wherein the receiving resonator is configured to harness electrical power transmitted wirelessly by a source resonator positioned a distance away from the receiving resonator, and wherein the receiving resonator and the source resonator are configured for near-field resonant inductive coupling;

c) a primary power control circuit, comprising;

i) an electrical impedance matching circuit and an electrical rectifying circuit that are electrically connectable to the receiving resonator, wherein the electrical rectifying circuit is configured to modify the harnessed electrical power from an alternating current to a direct current electrical power; and

ii) a primary power supply circuit having a first voltage regulator circuit electrically connected to the electrical impedance matching circuit and to the electrical rectifying circuit, wherein the first voltage regulator circuit is configured to modify a first voltage of the direct current electrical power from the rectifying circuit, and wherein the primary power supply circuit is configured to output a primary electrical power having the first voltage to a primary power line;

d) a secondary power control circuit electrically connected to the primary power control circuit, the secondary power control circuit comprising;

i) at least one capacitor or secondary electrochemical cell;

ii) a secondary power charging circuit electrically connected to the at least one capacitor or secondary electrochemical cell and being electrically connectable to the primary power line, wherein the secondary power charging circuit is configured to charge the at least one capacitor or secondary electrochemical cell; and

iii) a second voltage regulator circuit electrically connected to the at least one capacitor or secondary electrochemical cell, wherein the second voltage regulator circuit is configured to output a secondary electrical power having a second voltage from the at least one capacitor or secondary electrochemical cell to a secondary power line; and

e) a switching circuit electrically connected to the primary power line of the primary power control circuit and to the secondary power line of the secondary power control circuit, the switching circuit comprising;

i) a first field effect transistor electrically connected to the primary power line;

ii) a second field effect transistor electrically connected to the secondary power line; and

iii) a switching controller configured to detect the first voltage at a first input of the first field effect transistor and the second voltage at a second input of the second field effect transistor; and

f) wherein, based on at least the detected first and second voltages, actuation of the switching controller causes either the first field effect transistor or the second field effect transistor to be configured to pass electrical current from the switching circuit to a third power line exiting the switching circuit.

20. The electrical power control system of claim 19 wherein the first field effect transistor or the second field effect transistor having the greater of the detected first or the second voltage is configured to pass electrical current from the switching circuit to the third power line exiting the switching circuit.

21. The electrical power control system of claim 19 wherein the first or second voltage ranges from 1V to 50V.

22. The electrical power control system of claim 19 wherein the primary or secondary electrical power ranges from 1 watt to 2,000 watts.