CONTROL METHOD FOR WIRELESS CHARGING, AND WIRELESS CHARGING APPARATUS AND SYSTEM
Embodiments of the present disclosure provide a control method for wireless charging, a wireless charging apparatus and a wireless charging system. The control method includes: controlling a first power converter at a secondary side to charge a chargeable load at a first set current; receiving a sensing signal representing an output current of a second power converter at a primary side; and in response to the output current reaching or exceeding a threshold current, controlling the first power converter to charge the chargeable load at a second set current smaller than the first set current. The scheme of the present disclosure may implement power derating of the wireless charging system and ensure that the primary-side components of the system operate within the safety range.
1 . A control method for wireless charging, the control method comprising:
controlling a first power converter at a secondary side to charge a chargeable load at a first set current;
receiving a sensing signal representing an output current of a second power converter at a primary side; and
in response to the output current reaching or exceeding a threshold current, controlling the first power converter to charge the chargeable load at a second set current smaller than the first set current.
2 . The control method of claim 1 , further comprising:
in response to the output current being below the threshold current, controlling the first power converter to continue charging the chargeable load at the first set current.
3 . The control method of claim 1 , further comprising:
obtaining, based on the sensing signal, a quasi-peak value signal or a half-wave average signal corresponding to the sensing signal; and
determining, based on the quasi-peak value signal or the half-wave average signal, the output current of the second power converter.
4 . The control method of claim 3 , wherein determining, based on the quasi-peak value signal or the half-wave average signal, the output current of the second power converter comprises:
sampling the quasi-peak value signal or the half-wave average signal to determine a maximum value; and
determining, based on the maximum value, the output current of the second power converter.
5 . The control method of claim 1 , wherein receiving the sensing signal representing the output current of the second power converter at the primary side comprises:
receiving from a first current sensing device the sensing signal, wherein the first current sensing device is configured to sense a current in an output branch of the second power converter.
6 . The control method of claim 1 , wherein the second power converter is a single-phase full-bridge converter, and wherein receiving the sensing signal representing the output current of the second power converter at the primary side comprises:
receiving from a second current sensing device and a third current sensing device the sensing signal, wherein the second current sensing device is configured to sense a current in an upper bridge arm or a lower bridge arm of a first bridge arm of the single-phase full-bridge converter, and the third current sensing device is configured to sense a current in the lower bridge arm or the upper bridge arm of the first bridge arm, or sense a current in an upper bridge arm or a lower bridge arm of a second bridge arm of the single-phase full-bridge converter.
7 . The control method of claim 1 , further comprising:
adjusting the threshold current based on ambient conditions.
8 . The control method of claim 7 , wherein the ambient conditions comprise ambient temperature.
9 . The control method of claim 1 , wherein a charging coil at the secondary side is electromagnetically coupled to a charging coil at the primary side in a loose manner.
10 . A wireless charging apparatus, comprising:
a charging coil for electromagnetically coupling to a primary-side charging coil at a secondary side;
a first power converter; and
a control device for controlling the first power converter, wherein the control device is configured to:
control the first power converter to charge a chargeable load at a first set current;
receive a sensing signal representing an output current of a second power converter at a primary side; and
in response to the output current reaching or exceeding a threshold current, control the first power converter to charge the chargeable load at a second set current smaller than the first set current.
11 . The wireless charging apparatus of claim 10 , wherein the control device is further configured to:
in response to the output current being below the threshold current, control the first power converter to continue charging the chargeable load at the first set current.
12 . The wireless charging apparatus of claim 10 , wherein the control device is further configured to:
obtain, based on the sensing signal, a quasi-peak value signal or a half-wave average signal corresponding to the sensing signal; and
determine, based on the quasi-peak value signal or the half-wave average signal, the output current of the second power converter.
13 . The wireless charging apparatus of claim 12 , wherein determining, based on the quasi-peak value signal or the half-wave average signal, the output current of the second power converter comprises:
sampling the quasi-peak value signal or the half-wave average signal to determine a maximum value; and
determining, based on the maximum value, the output current of the second power converter.
14 . The wireless charging apparatus of claim 10 , wherein receiving the sensing signal representing the output current of the second power converter at the primary side comprises:
receiving from a first current sensing device the sensing signal, wherein the first current sensing device is configured to sense a current in an output branch of the second power converter.
15 . The wireless charging apparatus of claim 10 , wherein the second power converter is a single-phase full-bridge converter, and wherein receiving the sensing signal representing the output current of the second power converter at the primary side comprises:
receiving from a second current sensing device and a third current sensing device the sensing signal, wherein the second current sensing device is configured to sense a current in an upper bridge arm or a lower bridge arm of a first bridge arm of the single-phase full-bridge converter, and the third current sensing device is configured to sense a current in the lower bridge arm or the upper bridge arm of the first bridge arm, or sense a current in an upper bridge arm or a lower bridge arm of a second bridge arm of the single-phase full-bridge converter.
16 . The wireless charging apparatus of claim 10 , wherein the control device is further configured to:
adjust the threshold current based on ambient conditions.
17 . The wireless charging apparatus of claim 16 , wherein the ambient conditions comprise ambient temperature.
18 . The wireless charging apparatus of claim 10 , wherein a charging coil at the secondary side is electromagnetically coupled to a charging coil at the primary side in a loose manner.
19 . A wireless charging system, comprising:
a secondary-side charging apparatus; and
a primary-side charging apparatus, comprising:
a charging coil for electromagnetically coupling to a charging coil of the secondary-side charging apparatus at a primary side; and
a first power converter,
wherein the secondary-side charging apparatus comprises:
a charging coil for electromagnetically coupling to the primary-side charging coil at a secondary side:
a second power converter; and
a control device for controlling the second power converter, wherein the control device is configured to:
control the second power converter to charge a chargeable load at a first set current;
receive a sensing signal representing an output current of the first power converter at the primary side; and
in response to the output current reaching or exceeding a threshold current, control the second power converter to charge the chargeable load at a second set current smaller than the first set current.
20 . (canceled)
21 . The wireless charging system of claim 19 , wherein the first power converter is a single-phase full-bridge converter, and the wireless charging system further comprises:
a second current sensing device configured to sense a current in an upper bridge arm or a lower bridge arm of a first bridge arm of the single-phase full-bridge converter, and
a third current sensing device configured to sense a current in the lower bridge arm or the upper bridge arm of the first bridge arm, or configured to sense a current in an upper bridge arm or a lower bridge arm of a second bridge arm of the single-phase full-bridge converter.