Wireless power and data transmission system, power transmitting apparatus, and power receiving apparatus

• US 9,001,881 B2
• Filed: 05/07/2012
• Issued: 04/07/2015
• Est. Priority Date: 05/09/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Okamura, Shutai, Kinoshita, Keisuke
• Primary Examiner(s): Haider, Syed
• Application Number:
  US13/465,171
• Publication Number:
  US 20120287985A1
• Time in Patent Office: 1,065 Days
• Field of Search: 375/238, 375/259, 375/295, 375/300, 375/350
• US Class Current: 375/238
• CPC Class Codes: H03F 3/2176 Class E amplifiers
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H03K 7/08 Duration or width modulation ; Duty cycle modulation
• CPC Class Codes: H04L 25/02 Details ; arrangements for supplying electrical power along data transmission lines systems for transmitting signals via power distribution lines H04B3/54
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation

Abstract

A power transmitting apparatus is usable for wireless power and data transmission. The power transmitting apparatus includes a power transmitting section configured to transmit power and data to be transmitted as being converted into a pulse train; and a control section configured to control the power transmitting section such that a change of the power caused by superimposition of the data is decreased.

Claims

1. A power transmitting apparatus usable for wireless power and data transmission, the power transmitting apparatus comprising:

a power transmitting section configured to transmit a pulse train including a plurality of pulses on which power and data to be transmitted are superimposed; and

a control section configured to control the power transmitting section such that a change of the power caused by a superimposition of the data is decreased, wherein

the control section includes;

a driving voltage control section that changes an amplitude of the pulse train in accordance with a value of the data,

a correction value calculation section that calculates a correction value such that, when the amplitude of the pulse train is changed in accordance with the value of the data, the change of the power to be transmitted caused by the change of the amplitude is decreased, and

the power transmitting section includes;

a pulse width modulation section that, in accordance with the correction value, changes a pulse width of the pulse train such that the change of the power to be transmitted caused by the change of the amplitude is decreased; and

a radio frequency modulation section that modulates the frequency of the pulse train transmitted from the pulse width modulation section, wherein the radio frequency modulation section comprises an oscillation circuit.

2. The power transmitting apparatus of claim 1, wherein the pulse width modulation section, in synchronization with the change of the amplitude, changes a pulse width of the pulse train such that an area size of the pulse train is kept constant.

3. The power transmitting apparatus of claim 1, wherein:

the power transmitting section includes;

the pulse width modulation section further configured to output a first pulse train having a pulse width determined based on an instruction from the control section;

a pulse amplitude modulator configured to output a second pulse train obtained by amplifying the first pulse train as the pulse train; and

a resonator configured to transmit power and data based on the second pulse train; and

the control section is configured to control the pulse width modulation section and the pulse amplitude modulator such that an amplitude and a pulse width of the second pulse train are changed in accordance with the value of the data.

4. The power transmitting apparatus of claim 3, wherein:

the pulse amplitude modulator includes an amplifier configured to amplify the first pulse train with an input driving voltage and thus generating the second pulse train; and

the control section switches the driving voltage to be input to the amplifier in accordance with the value of the data, and thus changes the amplitude of the second pulse train.

5. The power transmitting apparatus of claim 1, wherein:

the power transmitting section includes;

the pulse width modulation section further configured to output a first pulse train having a pulse width determined based on an instruction from the control section;

a pulse amplitude modulator configured to output a second pulse train that has a frequency determined based on an instruction from the control section and is obtained by amplifying the first pulse train, as the pulse train; and

a resonator configured to transmit power and data based on the second pulse train; and

the control section changes a frequency of the first pulse train in accordance with the value of the data, and controls the pulse width modulation section such that a pulse width of the first pulse train is changed.

6. The power transmitting apparatus of claim 5, wherein when the data has a first value, the control section sets the frequency of the first pulse train to a first frequency which is substantially equal to a resonance frequency of the resonator;

and when the data has a second value, the control section sets the frequency of the first pulse train to a second frequency that is different from the first frequency.

7. The power transmitting apparatus of claim 1, wherein:

the power transmitting section includes;

the pulse width modulation section further configured to output a first pulse train having a pulse width determined based on an instruction from the control section;

a pulse amplitude modulator configured to output a second pulse train, obtained by amplifying the first pulse train output from the radio frequency modulation section, as the pulse train; and

an antenna including at least one resonator configured to transmit power and data based on the second pulse train; and

the control section controls the antenna such that a resonance frequency is changed and controls the pulse width modulation section such that a pulse width of the first pulse train is changed.

8. The power transmitting apparatus of claim 7, wherein when the data has a first value, the control section sets the resonance frequency to a first frequency that is substantially equal to a frequency of the first pulse train;

and when the data has a second value, the control section sets the resonance frequency to a second frequency that is different from the first frequency.

9. The power transmitting apparatus of claim 7, wherein:

the at least one resonator includes a plurality of resonators having different resonance frequencies; and

the control section selects one of the plurality of resonators and thus changes a resonance frequency of the antenna.

10. The power transmitting apparatus of claim 1, wherein when the data is first data, the power transmitting section amplifies second data by means of pulse width modulation and thus converts the power, the first data and the second data into the pulse train and transmits the pulse train.

11. The power transmitting apparatus of claim 10, wherein the control section controls the power transmitting section such that an amplitude and a pulse width of the pulse train are changed in accordance with a value of the first data at a timing at which the second data is not pulse-width-modulated.

12. The power transmitting apparatus of claim 10, wherein the control section controls the power transmitting section such that the power transmitting section performs addition or subtraction of a correction value in accordance with a value of the second data on the pulse width based on the second data and thus determines a pulse width of the pulse train.

13. The power transmitting apparatus of claim 10, wherein while not performing pulse width modulation on the second data, the power transmitting section outputs a synchronization pulse including a first transmission period in which a pulse having a first duty ratio is output and a second transmission period in which a pulse having a second duty ratio is output.

14. The power transmitting apparatus of claim 13, wherein the first duty ratio is 50%, and the second duty ratio is 0%.

15. A wireless power and data transmission system comprising:

a power transmitting apparatus including;

a power transmitting section configured to transmit a pulse train including a plurality of pulses on which power and data to be transmitted are superimposed; and

a control section configured to control the power transmitting section such that a change of the power caused by a superimposition of the data is decreased; and

a power receiving apparatus configured to receive the power and the data transmitted from the power transmitting apparatus, wherein

the control section includes;

a driving voltage control section that changes an amplitude of the pulse train in accordance with a value of the data,

a correction value calculation section that calculates a correction value such that, when the amplitude of the pulse train is changed in accordance with the value of the data, the change of the power to be transmitted caused by the change of the amplitude is decreased, and

the power transmitting section includes;

a pulse width modulation section that, in accordance with the correction value, changes a pulse width of the pulse train such that the change of the power to be transmitted caused by the change of the amplitude is decreased; and

a radio frequency modulation section that modulates the frequency of the pulse train transmitted from the pulse width modulation section, wherein the radio frequency modulation section comprises an oscillation circuit.