System and method for power transfer control based on available input power

• US 9,001,529 B2
• Filed: 05/04/2012
• Issued: 04/07/2015
• Est. Priority Date: 01/17/2012
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Muratov, Vladimir Alexander
• Primary Examiner(s): Zhang, Jue
• Assistant Examiner(s): Jackson, Lakaisha
• Application Number:
  US13/464,672
• Publication Number:
  US 20130182461A1
• Time in Patent Office: 1,068 Days
• Field of Search: 323/299, 363/15, 363/80, 363/89
• US Class Current: 363/15
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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
• 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: H02M 3/24 by static converters
• CPC Class Codes: H02M 3/26 using discharge tubes without control electrode or semiconductor devices without control electrode to produce the intermediate ac

Abstract

The present invention employs system and method in for distinguishing between power capabilities of various external power sources and a system that can communicate the identified power capabilities to the secondary side of the wireless power transfer system. Once the secondary side of the wireless power transfer system receives the power capability information, it adjusts the current available for a payload in accordance with the information received on power source capabilities.

Claims

1. A DC/DC converter for use with DC input signal, said DC/DC converter comprising:

an input portion operable to receive the DC input signal;

an input determining portion operable to determine a parameter of the DC input signal;

an information signal generator operable to generate a first information signal based on the parameter;

a primary signal generator operable to generate a primary signal based on the DC input signal and an information signal;

a transformer having a primary side and a secondary side, said primary side operable to induce a secondary signal in said secondary side based on the primary signal;

a controlling portion operable to generate a control signal based on the secondary signal;

a AC/DC converting portion operable to output a DC signal based on the secondary signal;

an output portion operable to output an output signal based on the DC signal;

a second controlling portion operable to generate a query,

wherein said transformer is further operable to send the query to said information signal generator, and

wherein said information signal generator is operable to generate the first information signal based on the parameter upon receipt of the query.

2. The DC/DC converter of claim 1,

wherein said information signal generator is operable to generate a pulse having a first predetermined pulse length as the first information signal,

wherein said primary signal generator is operable to generate the primary signal as a first signal portion, a second signal portion and a third signal portion,

wherein the first signal portion has a first amplitude,

wherein the second signal portion has a second amplitude and has a duration based on the first predetermined pulse length,

wherein the third signal portion has the first amplitude, and

wherein the first amplitude is not equal to the second amplitude.

3. The DC/DC converter of claim 2,

wherein said input portion is operable to receive the DC input signal as one of a first DC input signal and a second DC input signal, the first DC input signal having a first DC input signal amplitude, the second DC input signal having a second DC input signal amplitude,

wherein said input determining portion is operable to determine the amplitude of the DC input signal to be the first DC input signal amplitude when the DC input signal is the first DC input signal,

wherein said input determining portion is operable to determine the amplitude of the DC input signal to be the second DC input signal amplitude when the DC input signal is the second DC input signal,

wherein said information signal generator is operable to generate the pulse having a first predetermined pulse length when the DC input signal is the first DC input signal,

wherein said information signal generator further operable to generate the pulse having a second predetermined pulse length when the DC input signal is the second DC input signal,

wherein said DC/DC converting portion is operable to output the DC signal as a first DC signal portion followed by a second DC signal portion,

wherein the first DC signal portion has a first DC amplitude,

wherein the second DC signal portion has a second DC amplitude,

wherein the first DC amplitude is not equal to the second DC amplitude, and

wherein a start of the second DC signal portion is based on the pulse.

4. The DC/DC converter of claim 3, further comprising:

wherein the second DC signal portion has a second DC amplitude having a value V₁ when the DC input signal is the first AC input signal,

wherein the second DC signal portion has a second DC amplitude having a value V₂ when the DC input signal is the second DC input signal,

wherein V₁≠

V₂, and

wherein said controller is operable instruct said output portion to output the output signal as a first output signal when the second DC signal portion has a second DC amplitude having a value V₁, and

wherein said controller is operable instruct said output portion to output the output signal as a second output signal when the second DC signal portion has a second DC amplitude having a value V₂.

5. The DC/DC converter of claim 1 for use in a wireless power transfer system in which the information signal is based upon the power available at the primary side of the system.

6. The DC/DC converter of claim 2,

wherein said information signal generator further operable to generate the first information signal to include a second pulse having a second predetermined pulse length,

wherein said primary signal generator is further operable to generate the primary signal to additionally include fourth signal portion and a fifth signal portion,

wherein the fourth signal portion has the second amplitude,

wherein the fifth signal portion has the first amplitude, and

wherein the second pulse is separated from the first pulse.

7. The DC/DC converter of claim 6, further comprising:

a second controlling portion operable to generate a query,

wherein said transformer is further operable to send the query to said information signal generator, and

wherein said information signal generator is operable to generate the first information signal based on the parameter upon receipt of the query.

8. A method of converting a DC input signal to a DC signal, said method comprising:

receiving, via an input portion, the DC input signal;

determining, via an input determining portion, a parameter of the DC input signal;

generating, via an information signal generator, a first information signal based on the parameter;

generating, via a primary signal generator, a primary signal based on the DC input signal and the information signal;

inducing, in a secondary side of a transformer having a primary side and the secondary side, a secondary signal based on the primary signal;

generating, via a controlling portion, a control signal based on the secondary signal;

outputting, via a AC/DC converting portion, a DC signal based on the secondary signal; and

outputting, via an output portion, an output signal based on the DC signal;

generating, via a second controlling portion, a query; and

sending, via the transformer, the query to said information signal generator,

wherein said generating, via a controlling portion, a control signal based on the secondary signal comprises generating the control signal upon receipt of the query.

9. The method of claim 8,

wherein said generating, via an information signal generator, a first information signal based on the parameter comprises generating a pulse having a first predetermined pulse length as the first information signal,

wherein said generating, via a primary signal generator, a primary signal based on the DC input signal and the information signal comprises generating the primary signal as a first signal portion, a second signal portion and a third signal portion,

wherein the first signal portion has a first amplitude,

wherein the second signal portion has a second amplitude and has a duration based on the first predetermined pulse length,

wherein the third signal portion has the first amplitude, and

wherein the first amplitude is not equal to the second amplitude.

10. The method of claim 9,

wherein said receiving, via an input portion, the DC input signal comprises receiving the DC input signal as one of a first DC input signal and a second DC input signal, the first DC input signal having a first DC input signal amplitude, the second DC input signal having a second DC input signal amplitude,

wherein said determining, via an input determining portion, a parameter of the DC input signal comprises determining the amplitude of the DC input signal to be the first DC input signal amplitude when the DC input signal is the first DC input signal,

wherein said determining, via an input determining portion, a parameter of the DC input signal comprises determining the amplitude of the DC input signal to be the second DC input signal amplitude when the DC input signal is the second DC input signal,

wherein said generating, via an information signal generator, a first information signal based on the parameter comprises generating the pulse having a first predetermined pulse length when the DC input signal is the first DC input signal,

wherein said generating, via an information signal generator, a first information signal based on the parameter comprises generating the pulse having a second predetermined pulse length when the DC input signal is the second DC input signal,

wherein said outputting, via a AC/DC converting portion, a DC signal based on the secondary signal comprises outputting the DC signal as a first DC signal portion followed by a second DC signal portion,

wherein the first DC signal portion has a first DC amplitude,

wherein the second DC signal portion has a second DC amplitude,

wherein the first DC amplitude is not equal to the second DC amplitude, and

wherein a start of the second DC signal portion is based on the pulse.

11. The method of claim 10, further comprising:

wherein the second DC signal portion has a second DC amplitude having a value V₁ when the DC input signal is the first DC input signal,

wherein the second DC signal portion has a second DC amplitude having a value V₂ when the DC input signal is the second DC input signal,

wherein V₁≠

V₂, and

wherein the controller is operable instruct the output portion to output the output signal as a first output signal when the second DC signal portion has a second DC amplitude having a value V₁, and

wherein the controller is operable instruct the output portion to output the output signal as a second output signal when the second DC signal portion has a second DC amplitude having a value V₂.

12. The method of claim 11, further comprising:

generating, via a second controlling portion, a query; and

sending, via the transformer, the query to said information signal generator,

wherein said generating, via a controlling portion, a control signal based on the secondary signal comprises generating the control signal upon receipt of the query.

13. The method of claim 8 for use in a wireless power transfer system in which the information signal is based upon the power available at the primary side of the system.

14. The method of claim 8,

wherein the information signal generator is further operable to generate the first information signal to include a second pulse having a second predetermined pulse length,

wherein the primary signal generator is further operable to generate the primary signal to additionally include fourth signal portion and a fifth signal portion,

wherein the fourth signal portion has the second amplitude,

wherein the fifth signal portion has the first amplitude, and

wherein the second pulse is separated from the first pulse.

15. The method of claim 14, further comprising:

generating, via a second controlling portion, a query; and

sending, via the transformer, the query to said information signal generator,

wherein said generating, via a controlling portion, a control signal based on the secondary signal comprises generating the control signal upon receipt of the query.

16. A DC/DC converter for use with DC input signal, said DC/DC converter comprising:

an input portion operable to receive the DC input signal;

an input determining portion operable to determine a parameter of the DC input signal;

an information signal generator operable to generate a first information signal based on the parameter;

a primary signal generator operable to generate a primary signal based on the DC input signal and the information signal;

a transformer having a primary side and a secondary side, said primary side operable to induce a secondary signal in said secondary side based on the primary signal;

a controlling portion operable to generate a control signal based on the secondary signal;

a AC/DC converting portion operable to output a DC signal based on the secondary signal;

a second controlling portion operable to generate a query; and

an output portion operable to output an output signal based on the DC signal,

wherein said information signal generator is operable to generate a pulse having a first predetermined pulse length as the first information signal,

wherein said primary signal generator is operable to generate the primary signal as a first signal portion, a second signal portion and a third signal portion,

wherein the first signal portion has a first amplitude,

wherein the second signal portion has a second amplitude and has a duration based on the first predetermined pulse length,

wherein the third signal portion has the first amplitude,

wherein the first amplitude is not equal to the second amplitude,

wherein said input portion is operable to receive the DC input signal as one of a first DC input signal and a second DC input signal, the first DC input signal having a first DC input signal amplitude, the second DC input signal having a second DC input signal amplitude,

wherein said input determining portion is operable to determine the amplitude of the DC input signal to be the first DC input signal amplitude when the DC input signal is the first DC input signal,

wherein said input determining portion is operable to determine the amplitude of the DC input signal to be the second DC input signal amplitude when the DC input signal is the second DC input signal,

wherein said information signal generator is operable to generate the pulse having a first predetermined pulse length when the DC input signal is the first DC input signal,

wherein said information signal generator further operable to generate the pulse having a second predetermined pulse length when the DC input signal is the second DC input signal,

wherein said DC/DC converting portion is operable to output the DC signal as a first DC signal portion followed by a second DC signal portion,

wherein the first DC signal portion has a first DC amplitude,

wherein the second DC signal portion has a second DC amplitude,

wherein the first DC amplitude is not equal to the second DC amplitude,

wherein a start of the second DC signal portion is based on the pulse,

wherein the second DC signal portion has a second DC amplitude having a value V₁ when the DC input signal is a first AC input signal,

wherein the second DC signal portion has a second DC amplitude having a value V₂ when the DC input signal is the second DC input signal,

wherein V₁≠

V₂, and

wherein said controller is operable instruct said output portion to output the output signal as a first output signal when the second DC signal portion has a second DC amplitude having a value V₁,

wherein said controller is operable instruct said output portion to output the output signal as a second output signal when the second DC signal portion has a second DC amplitude having a value V₂,

wherein said transformer is further operable to send the query to said information signal generator,

wherein said information signal generator is operable to generate the first information signal based on the parameter upon receipt of the query, and

wherein said query corresponds inquires as to whether the DC input signal is 30 W.