WIRELESS POWER TRANSMISSION APPARATUS AND CONTROL METHOD FOR THE SAME

• US 20180131243A1
• Filed: 11/08/2017
• Published: 05/10/2018
• Est. Priority Date: 11/08/2016
• Status: Active Grant

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: HAMAGUCHI, Sayako, HE, Xun, INOUE, Naoki
• Granted Patent: US 10,658,881 B2
• Time in Patent Office: Days
• 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: H02M 7/5387 in a bridge configuration

Abstract

First, a power receiving apparatus RX is detected (S100). Subsequently, a pre digital ping is sent according to a first method (S112). Upon reception of an unique signal defined for the first method from the power receiving apparatus RX (YES in S114), tentative judgment is made that the power receiving apparatus RX supports the first method, and the flow transits to a final judgment operation (S120). When such an unique signal has not been received (NO in S114), tentative judgment is made that the power receiving apparatus RX supports a second method, and the flow transits to a final judgment operation (S130).

Claims

1. A control method for a wireless power transmission apparatus structured to be capable of supplying electric power to a wireless power receiving apparatus that supports at least a first method or otherwise a second method, the control method comprising:

a step A in which the wireless power receiving apparatus is detected;

a step B in which, when the wireless power receiving apparatus has been detected, a pre digital ping is sent according to the first method, and when the wireless power transmission apparatus has received an unique signal defined for the first method from the wireless power receiving apparatus as a result of the pre digital ping of the first method, tentative judgment is made that the wireless power receiving apparatus supports the first method, and when the wireless power transmission apparatus has not received such an unique signal, tentative judgment is made that the wireless power receiving apparatus supports the second method;

a step C in which, when tentative judgment has been made that the wireless power receiving apparatus supports the first method, final judgment is made regarding whether or not the wireless power receiving apparatus supports the first method; and

a step D in which, when tentative judgment has been made that the wireless power receiving apparatus supports the second method, final judgment is made regarding whether or not the wireless power receiving apparatus supports the second method.

2. The control method according to claim 1, wherein, in the step C, a post digital ping is sent according to the first method,

and wherein, upon reception of an unique signal defined for the first method from the wireless power receiving apparatus as a result the post digital ping of the first method, final judgment is made that the wireless power receiving apparatus supports the first method.

3. The control method according to claim 1, wherein, in the step D, an analog ping and a digital ping are sent according to the second method,

and wherein, upon reception of an unique signal defined for the second method from the wireless power receiving apparatus as a result of the digital ping of the second method, final judgment is made that the wireless power receiving apparatus supports the second method.

4. The control method according to claim 1, wherein, when neither final judgment that the wireless power receiving apparatus supports the first method nor final judgment that the wireless power receiving apparatus supports the second method has been made, the aforementioned steps C and D are repeated in a predetermined sequence.

5. The control method according to claim 4, wherein the aforementioned sequence differs from an alternating sequence in which the aforementioned steps C and D are alternately repeated.

6. The control method according to claim 4, wherein the ratio between a number of times the aforementioned step C is performed and a number of times the aforementioned step D is performed corresponds to a magnitude relation between a number of wireless power receiving apparatuses that support the first method and a number of wireless power receiving apparatuses that support the second method.

7. The control method according to claim 1, wherein the wireless power transmission apparatus comprises a plurality of transmission coils,

wherein, in the aforementioned step B, a sequence comprising sending a digital ping of the first method, acquiring an electrical state of the selected transmission coil, and judging whether or not an unique signal defined for the first method has been received is repeatedly executed while sequentially selecting one from among the plurality of transmission coils,

and wherein, when an unique signal defined for the first method has been received as a result of the digital ping of the first method, the transmission coil to be used in the subsequent operations is determined based on results of comparison of the unique signals received for the respective transmission coils.

8. The control method according to claim 7, wherein, when an unique signal defined for the first method has not been received as a result of the digital ping of the first method, the transmission coil to be used in the subsequent operations is determined based on results of comparison of the electrical states acquired for the plurality of respective transmission coils.

9. The control method according to claim 8, wherein the electrical state is a voltage at a connection node that couples the transmission coils and a series resonance capacitor.

10. The control method according to claim 1, wherein the first method corresponds to the Qi standard, and the second method corresponds to the PMA standard.

11. The control method according to claim 10, wherein, in the aforementioned step C, a Q value of the transmission antenna is measured before sending a post digital ping of the first method.

12. The control method according to claim 11, wherein, in a case in which the aforementioned step C is repeated a plurality of times, the Q value measurement is omitted in a second and subsequent executions of the step C.

13. A wireless power transmission apparatus structured to be capable of supplying electric power to a wireless power receiving apparatus that supports at least a first method or otherwise a second method, the wireless power transmission apparatus comprising:

a transmission antenna;

an inverter arranged such that an output side thereof is coupled to the transmission antenna; and

a controller structured to control the inverter,

wherein the controller is structured to execute;

a step A in which the wireless power receiving apparatus is detected;

a step B in which, when the wireless power receiving apparatus has been detected, a pre digital ping is sent according to the first method, and when the wireless power transmission apparatus has received an unique signal defined for the first method from the wireless power receiving apparatus as a result of the pre digital ping of the first method, tentative judgment is made that the wireless power receiving apparatus supports the first method, and when the wireless power transmission apparatus has not received such an unique signal, tentative judgment is made that the wireless power receiving apparatus supports the second method;

a step C in which, when tentative judgment has been made that the wireless power receiving apparatus supports the first method, final judgment is made regarding whether or not the wireless power receiving apparatus supports the first method; and

a step D in which, when tentative judgment has been made that the wireless power receiving apparatus supports the second method, final judgment is made regarding whether or not the wireless power receiving apparatus supports the second method.

14. The wireless power transmission apparatus according to claim 13, wherein the controller is structured such that, in the step C, a post digital ping is sent according to the first method, and upon reception of an unique signal defined for the first method from the wireless power receiving apparatus as a result of the post digital ping of the first method, final judgment is made that the wireless power receiving apparatus supports the first method.

15. The wireless power transmission apparatus according to claim 13, wherein the controller is structured such that, in the step D, an analog ping and a digital ping are sent according to the second method, and upon reception of an unique signal defined for the second method from the wireless power receiving apparatus as a result of the digital ping of the second method, final judgment is made that the wireless power receiving apparatus supports the second method.

16. The wireless power transmission apparatus according to claim 13, structured such that, when neither final judgment that the wireless power receiving apparatus supports the first method nor final judgment that the wireless power receiving apparatus supports the second method has been made, the aforementioned steps C and D are repeated in a predetermined sequence.

17. The wireless power transmission apparatus according to claim 16, structured such that the aforementioned sequence differs from an alternating sequence in which the aforementioned steps C and D are alternately repeated.

18. The wireless power transmission apparatus according to claim 16, structured such that the ratio between a number of times the aforementioned step C is performed and a number of times the aforementioned step D is performed corresponds to a magnitude relation between a number of wireless power receiving apparatuses that support the first method and a number of wireless power receiving apparatuses that support the second method.

19. The wireless power transmission apparatus according to claim 13, wherein the transmission antenna comprises a plurality of transmission coils,

wherein the controller is structured to execute a sequence comprising sending a digital ping of the first method, acquiring an electrical state that occurs at the selected transmission coil, and judging whether or not an unique signal defined for the first method has been received while sequentially selecting one from among the plurality of transmission coils,

and wherein, when an unique signal defined for the first method has been received as a result of the digital ping of the first method, the transmission coil to be used in the subsequent operations is determined based on results of comparison of the unique signals received for the respective transmission coils.

20. The wireless power transmission apparatus according to claim 19, structured such that, when an unique signal defined for the first method has not been received as a result of the digital ping of the first method, the transmission coil to be used in the subsequent operations is determined based on results of comparison of the electrical states acquired for the plurality of respective transmission coils.

21. The wireless power transmission apparatus according to claim 20, structured such that the electrical state is a voltage at a connection node that couples the transmission coils and a series resonance capacitor.

22. The wireless power transmission apparatus according to claim 13, structured such that the first method corresponds to the Qi standard, and the second method corresponds to the PMA standard.

23. The wireless power transmission apparatus according to claim 22, structured such that, in the aforementioned step C, a Q value of the transmission antenna is measured before sending a post digital ping of the first method.

24. The wireless power transmission apparatus according to claim 23, structured such that, in a case in which the aforementioned step C is repeated a plurality of times, the Q value measurement is omitted in a second and subsequent executions of the step C.