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EP-3910756-B1 - WIRELESS CHARGING CONTROL METHOD AND CHARGING CONTROL APPARATUS

EP3910756B1EP 3910756 B1EP3910756 B1EP 3910756B1EP-3910756-B1

Inventors

  • YANG, JUN
  • WAN, Shiming
  • LIN, Shangbo

Dates

Publication Date
20260506
Application Date
20190118

Claims (13)

  1. A wireless charging control method, applied to a charging control device (130, 230), wherein the charging control device (130, 230) comprises a wireless receiver circuit (131, 231) and a battery (133, 232), the wireless receiver circuit (131, 231) is configured to receive a wireless charging signal transmitted by a transmitting device (120, 220) and convert the wireless charging signal into a charging voltage and/or charging current to charge the battery (133, 232), and the method comprises: determining (S210), according to an output voltage of the wireless receiver circuit (131, 231), whether a power of the wireless charging signal can meet a first charging power of the battery (133, 232), the first charging power of the battery (133, 232) being a charging power currently required by the battery (133, 232), comprising: determining whether the output voltage of the wireless receiver circuit (131, 231) can reach a target voltage, the target voltage indicating an output voltage of the wireless receiver circuit (131, 231) that enables the first charging power of the battery (133, 232) to be met; and determining that the power of the wireless charging signal received by the wireless receiver circuit (131, 231) fails to meet the first charging power of the battery (133, 232), in response to determining that the output voltage of the wireless receiver circuit (131, 231) fails to reach the target voltage; and the method being characterized by further comprising: reducing (S220) the first charging power of the battery (133, 232) in response to determining that the power of the wireless charging signal fails to meet the first charging power of the battery (133, 232), until the power of the wireless charging signal meets the reduced first charging power of the battery (133, 232); and charging the battery (133, 232) with the reduced first charging power of the battery (133, 232), comprising: reducing a charging current currently required by the battery (133, 232); continuing to detect the output voltage of the wireless receiver circuit (131, 231); if a difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is zero, charging the battery (133, 232) with the reduced charging current; or if it is determined many times that the difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is still not zero after the charging current required by the battery is reduced, continuing to reduce the charging current required by the battery (133, 232).
  2. The method as claimed in claim 1, wherein the determining that the power of the wireless charging signal received by the wireless receiver circuit (131, 231) fails to meet the first charging power of the battery (133, 232), in response to determining that the output voltage of the wireless receiver circuit (131, 231) fails to reach the target voltage, comprises: sending, to the transmitting device (120, 220), instruction information to instruct the transmitting device (120, 220) to increase a transmit voltage, in response to determining the output voltage of the wireless receiver circuit (131, 231) does not reach the target voltage; and determining that the power of the wireless charging signal fails to meet the first charging power of the battery (133, 232), in response to determining that the output voltage of the wireless receiver circuit (131, 231) still fails to reach the target voltage after the transmitting device (120, 220) has been instructed at least twice to increase the transmit voltage.
  3. The method as claimed in claim 1, wherein the device to-be-charged (130, 230) sets multiple grades for the charging current required by the battery (133, 232); and the reducing a charging current currently required by the battery (133, 232) comprises: in response to determining that the difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is larger than a first value, reducing the charging current required by the battery (133, 232) by at least two grades, a current value corresponding to each grade being a fixed value; and in response to determining that the difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is smaller than a second value that is less than the first value, reducing the charging current required by the battery (133, 232) by one grade.
  4. The method as claimed in claim 2, wherein the reducing (S220) the first charging power of the battery (133, 232), in response to determining that the power of the wireless charging signal fails to meet the first charging power of the battery (133, 232), comprises: reducing the first charging power of the battery (133, 232), in response to determining that the power of the wireless charging signal after being adjusted within a preset period of time still fails to meet the first charging power of the battery (133, 232).
  5. The method as claimed in any one of claims 1 to 4, wherein after the first charging power of the battery (133, 232) is reduced, the method further comprises: increasing (S406) the charging current currently required by the battery (133, 232) from a current charging current to a target charging current, wherein the target charging current is a maximum charging current required by the battery (133, 232); and maintaining the charging current currently required by the battery (133, 232) at the current charging current, in response to determining that the power of the wireless charging signal fails to meet the target charging current.
  6. The method as claimed in claim 5, wherein the increasing (S406) the charging current currently required by the battery (133, 232) from a current charging current to a target charging current comprises: increasing the charging current currently required by the battery (133, 232) to the target charging current in such a manner that the charging current currently required by the battery (133, 232) is increased by a certain amount each time.
  7. A charging control device (130, 230), comprising: a battery (133, 232); a wireless receiver circuit (131, 231), configured to receive a wireless charging signal transmitted by a transmitting device (120, 220) and convert the wireless charging signal into a charging voltage and/or charging current to charge the battery (133, 232); and a communication control circuit (235), configured to determine, according to an output voltage of the wireless receiver circuit (131, 231), whether a power of the wireless charging signal can meet a first charging power of a battery (133, 232), the first charging power of the battery (133, 232) being a charging power currently required by the battery (133, 232); wherein the communication control circuit (235) is specifically configured to: determine whether the output voltage of the wireless receiver circuit (131, 231) can reach a target voltage, the target voltage indicating an output voltage of the wireless receiver circuit (131, 231) that enables the first charging power of the battery (133, 232) to be met; and determine that the power of the wireless charging signal received by the wireless receiver circuit (131, 231) fails to meet the first charging power of the battery (133, 232), in response to determining that the output voltage of the wireless receiver circuit (131, 231) fails to reach the target voltage; characterized in that the communication control circuit (235) is further configured to reduce the first charging power of the battery (133, 232), in response to determining that the power of the wireless charging signal fails to meet the first charging power of the battery (133, 232), until the power of the wireless charging signal meets the reduced first charging power of the battery (133, 232); and charge the battery (133, 232) with the reduced first charging power of the battery (133, 232); and the communication control circuit (235) is specifically configured to: reduce a charging current currently required by the battery (133, 232); continue to detect the output voltage of the wireless receiver circuit (131, 231); if a difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is zero, charge the battery (133, 232) with the reduced charging current; or if it is determined many times that the difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is still not zero after the charging current required by the battery (133, 232) is reduced, continue to reduce the charging current required by the battery (133, 232).
  8. The charging control device (130, 230) as claimed in claim 7, wherein the communication control circuit (235) is further configured to: send, to the transmitting device (120, 220), instruction information to instruct the transmitting device (120, 220) to increase a transmit voltage, in response to determining that the output voltage of the wireless receiver circuit (131, 231) does not reach the target voltage; and determine that the power of the wireless charging signal fails to meet the first charging power of the battery (133, 232), in response to determining that the output voltage of the wireless receiver circuit (131, 231) still fails to reach the target voltage after the transmitting device (120, 220) has been instructed at least twice to increase the transmit voltage.
  9. The charging control device (130, 230) as claimed in claim 7, wherein the device to-be-charged (130, 230) sets multiple grades for the charging current required by the battery (133, 232), and the communication control circuit (235) is configured to: in response to determining that the difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is larger than a first value, reduce the charging current required by the battery (133, 232) by at least two grades, a current value corresponding to each grade being a fixed value; and in response to determining that the difference between the output voltage of the wireless receiver circuit (131, 231) and the target voltage is smaller than a second value that is less than the first value, reduce the charging current required by the battery (133, 232) by one grade.
  10. The charging control device (130, 230) as claimed in claim 8, wherein the communication control circuit (235) is configured to: reduce the first charging power of the battery (133, 232), in response to determining that the power of the wireless charging signal after being adjusted within a preset period of time still fails to meet the first charging power of the battery (133, 232).
  11. The charging control device (130, 230) as claimed in any one of claims 7 to 10, wherein after the first charging power of the battery (133, 232) is reduced, the communication control circuit (235) is further configured to: increase the charging current currently required by the battery (133, 232) from a current charging current to a target charging current in such a manner that the charging current currently required by the battery (133, 232) is increased by a certain amount each time, wherein the target charging current is a maximum charging current required by the battery (133, 232); and maintain the charging current currently required by the battery (133, 232) at the current charging current, in response to determining that the power of the wireless charging signal fails to meet the target charging current.
  12. The charging control device (130, 230) as claimed in any one of claims 7 to 11, wherein the communication control circuit (235) is further configured to control, according to a charging mode of the transmitting device (120, 220), switching between a first charging channel (233) and a second charging channel (236) of the charging control device (130, 230).
  13. A wireless charging system, comprising: a charging control device (130, 230) as claimed in any of claims 7 to 12; and a transmitting device (120, 220) configured to transmitting a wireless charging signal to the charging control device (130, 230).

Description

TECHNICAL FIELD This disclosure relates to the field of wireless charging, and particularly to a wireless charging control method, a charging control device and a wireless charging system. BACKGROUND For a device to-be-charged, a charging cable is required when adopting a wired charging approach, which leads to cumbersome operations in the charging preparation stage. In contrast, a wireless charging approach is attracting more and more people. And more and more devices to-be-charged support functions such as wireless charging or wireless transmission. However, when the wireless charging approach is adopted to charge the device to-be-charged, the wireless charging dock and the device to-be-charged may be misaligned with each other, which causes most of the wireless charging signals emitted by the wireless charging dock not to be received by the device to-be-charged, resulting in low charging efficiency. In addition, if insufficient charging power is provided to the device to-be-charged, the device to-be-charged occupies the communication channel to request power all the time, resulting in a waste of the channel resources. Therefore, it has become an urgent problem to be solved in the process of wireless charging of how to determine whether the device to-be-charged is misaligned and how to alleviate the waste of channel resources. US 2016/0352155 A1 discloses a control circuit for controlling a wireless power receiving apparatus that receives an electric power signal from a wireless power transmission apparatus. An electric power detection unit detects the received electric power PRX received by the wireless power receiving apparatus. A control unit generates a control signal CE for controlling the electric power PTX to be transmitted by the wireless power transmission apparatus. When the received electric power PRX detected by the electric power detection unit falls despite the control signal CE not indicating an instruction to lower the electric power PTX to be transmitted, an abnormal state judgment unit judges that an abnormal state has occurred. US 2016/0218520 A1 discloses a wireless power enabled apparatus, includes a wireless power receiver. The wireless power receiver includes a receive coil configured to generate an AC power signal responsive to wireless power transfer from a wireless power transmitter, at least one secondary sensing coil configured to generate a signal responsive to a magnetic flux field generated during the wireless power transfer, and control logic operably coupled with the at least one secondary sensing coil. The control logic is configured to detect at least one condition of a wireless power transfer system responsive to detecting distortion in the magnetic flux field from the measurement signal received from the at least one secondary sensing coil. The wireless power transmitter reduces a power level responsive to a detection of misalignment of the transmit coil and the receive coil. WO 2018184428 A1 discloses a wireless charging system includes a wireless charging apparatus and a device to-be-charged. The wireless charging apparatus and the device to-be-charged perform wireless communication by means of a communication control circuit so as to adjust the transmitting power of the wireless charging apparatus. Besides, a voltage decreasing circuit is provided on a charging channel inside the device to-be-charged so that the wireless charging system can charge the device to-be-charged in a high-voltage low-current mode. SUMMARY The present disclosure provides a wireless charging control method, a charging control device and a wireless charging system, by which the waste of channel resources that is caused due to the misalignment of the device to-be-charged can be reduced. The invention is set out in the appended set of claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating a wireless charging system.FIG. 2 is a schematic flowchart of a wireless charging control method provided by an embodiment of the invention.FIG. 3 is a schematic structural diagram of a wireless charging system provided by an embodiment of the invention.FIG. 4 is a schematic flowchart of a wireless charging control method provided by another embodiment of the invention.FIG. 5 is a schematic structural diagram of a charging control device provided by an embodiment of the invention.FIG. 6 is a schematic structural diagram of a wireless charging system provided by another embodiment of the invention.FIG. 7 is a schematic structural diagram of a wireless charging system provided by a further embodiment of the invention.FIG. 8 is a schematic structural diagram of a wireless charging system provided by yet another embodiment of the invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS In the related wireless charging technology, a power supply device (such as an adapter) is generally connected with a wireless charging device (such as a wireless charging dock), and the wireless chargi