Wireless charging receiver, charging system and terminal
The present disclosure relates to a wireless charging receiver, a charging system, and a terminal. The wireless charging receiver includes: a receiving coil, configured to couple an alternating magnetic field of a transmitting coil of a wireless charging transmitter, to obtain an AC power supply; a receiving chip, having an input coupled to the receiving coil and an output coupled to an input of a switched-capacitor conversion chip, and configured to convert the AC power supply into a first DC power supply; and the switched-capacitor conversion chip, having an output coupled to a battery, and configured to output a second DC power supply based on the first DC power supply, and charge the battery based on the second DC power supply.
1. A wireless charging receiver, comprising:
a receiving coil, configured to couple an alternating magnetic field of a transmitting coil of a wireless charging transmitter, to obtain an alternating-current (AC) power supply;
a receiving chip, having an input coupled to the receiving coil and an output coupled to an input of a switched-capacitor conversion chip, and configured to convert the AC power supply into a first direct-current (DC) power supply; and
the switched-capacitor conversion chip, having an output coupled to a battery, and configured to output a second DC power supply based on the first DC power supply, and charge the battery based on the second DC power supply, a voltage of the second DC power supply being lower than a voltage of the first DC power supply, and a current of the second DC power supply being greater than a current of the first DC power supply,
wherein the switched-capacitor conversion chip is configured to detect a path current, and enter into a current limiting mode in response to the path current being greater than or equal to a sum of a current threshold and a first current deviation, the first current deviation being greater than or equal to 0, and lower than the current threshold.
2. The receiver of claim 1 , comprises a power management chip (PM IC), wherein:
the switched-capacitor conversion chip comprises a first-stage switched-capacitor conversion chip and a second-stage switched-capacitor conversion chip;
an input of the first-stage switched-capacitor conversion chip is coupled to the receiving chip, an output of the first-stage switched-capacitor conversion chip is coupled to an input of the second-stage switched-capacitor conversion chip and an input of the power management chip, and an output of the second-stage switched-capacitor conversion chip and an output of the power management chip are coupled to the battery;
the first-stage switched-capacitor conversion chip is configured to output a third DC power supply based on the first DC power supply, a voltage of the third DC power supply being lower than a voltage of the first DC power supply, and a current of the third DC power supply being greater than a current of the first DC power supply;
the second-stage switched-capacitor conversion chip is configured to output the second DC power supply based on the third DC power supply, and charge the battery with a first current based on the second DC power supply, a voltage of the second DC power supply being lower than a voltage of the third DC power supply, and a current of the second DC power supply being greater than a current of the third DC power supply; and
the power management chip is configured to charge the battery with a second current based on the second DC power supply, the second current being lower than the first current.
3. The receiver of claim 1 , wherein the switched-capacitor conversion chip is configured to enter into the current limiting mode by at least one of:
increasing an on-resistance of an internal switch of the switched-capacitor conversion chip;
disconnecting an internal switch for charging a charging capacitor in the switched-capacitor conversion chip;
connecting the charging capacitor to an output of the switched-capacitor conversion chip in parallel for discharging; and
reducing a charging duration of the charging capacitor in the switched-capacitor conversion chip.
4. The receiver of claim 1 , wherein the switched-capacitor conversion chip is configured to exit the current limiting mode in response to the path current being lower than a difference between the current threshold and a second current deviation, the second current deviation being greater than or equal to 0, and lower than the current threshold.
5. The receiver of claim 1 , wherein the path current comprises at least one of:
an input current of the switched-capacitor conversion chip, an output current of the switched-capacitor conversion chip, and a current on an internal switch in the switched-capacitor conversion chip.
6. The receiver of claim 1 , wherein the switched-capacitor conversion chip is configured to adjust the current threshold according to a first control instruction from a processor of a terminal.
7. The receiver of claim 6 , wherein the switched-capacitor conversion chip is configured to enter into a shoot-through state according to a second control instruction from the processor of the terminal.
8. A terminal, comprising:
a wireless charging receiver comprising:
a receiving coil, configured to couple an alternating magnetic field of a transmitting coil of a wireless charging transmitter, to obtain an alternating-current (AC) power supply;
a receiving chip, having an input coupled to the receiving coil and an output coupled to an input of a switched-capacitor conversion chip, and configured to convert the AC power supply into a first direct-current (DC) power supply; and
the switched-capacitor conversion chip, having an output coupled to a battery, and configured to output a second DC power supply based on the first DC power supply, and charge the battery based on the second DC power supply, a voltage of the second DC power supply being lower than a voltage of the first DC power supply, and a current of the second DC power supply being greater than a current of the first DC power supply; and
a processor, wherein:
the switched-capacitor conversion chip is configured to detect a path current, and enter into a current limiting mode in response to the path current being greater than or equal to a sum of a current threshold and a first current deviation, the first current deviation being greater than or equal to 0, and lower than the current threshold;
the processor is configured to output a first control instruction for adjusting the current threshold according to a path current expected presently; and
the switched-capacitor conversion chip is configured to adjust the current threshold according to the first control instruction.
9. The terminal of claim 8 , wherein the wireless charging receiver comprises a power management chip (PMIC), wherein:
the switched-capacitor conversion chip comprises a first-stage switched-capacitor conversion chip and a second-stage switched-capacitor conversion chip;
an input of the first-stage switched-capacitor conversion chip is coupled to the receiving chip, an output of the first-stage switched-capacitor conversion chip is coupled to an input of the second-stage switched-capacitor conversion chip and an input of the power management chip, and an output of the second-stage switched-capacitor conversion chip and an output of the power management chip are coupled to the battery;
the first-stage switched-capacitor conversion chip is configured to output a third DC power supply based on the first DC power supply, a voltage of the third DC power supply being lower than a voltage of the first DC power supply, and a current of the third DC power supply being greater than a current of the first DC power supply;
the second-stage switched-capacitor conversion chip is configured to output the second DC power supply based on the third DC power supply, and charge the battery with a first current based on the second DC power supply, a voltage of the second DC power supply being lower than a voltage of the third DC power supply, and a current of the second DC power supply being greater than a current of the third DC power supply; and
the power management chip is configured to charge the battery with a second current based on the second DC power supply, the second current being lower than the first current.
10. The terminal of claim 8 , wherein the switched-capacitor conversion chip is configured to enter into the current limiting mode by at least one of:
increasing an on-resistance of an internal switch of the switched-capacitor conversion chip;
disconnecting an internal switch for charging a charging capacitor in the switched-capacitor conversion chip;
connecting the charging capacitor to an output of the switched-capacitor conversion chip in parallel for discharging; and
reducing a charging duration of the charging capacitor in the switched-capacitor conversion chip.
11. The terminal of claim 8 , wherein the processor is configured to reduce an output voltage of the receiving chip of the wireless charging receiver according to an on-resistance of an internal switch of the switched-capacitor conversion chip, a conductive state of the internal switch of the switched-capacitor conversion chip, or a charging duration of a charging capacitor in the switched-capacitor conversion chip.
12. The terminal of claim 8 , wherein the processor is configured to output a second control instruction for controlling the switched-capacitor conversion chip to enter into a shoot-through state in response to entering a constant-voltage charging period; and
the switched-capacitor conversion chip is configured to enter into the shoot-through state according to the second control instruction.
13. A charging system, comprising:
a wireless charging transmitter;
a battery;
a wireless charging receiver comprising:
a receiving coil, configured to couple an alternating magnetic field of a transmitting coil of a wireless charging transmitter, to obtain an alternating-current (AC) power supply;
a receiving chip, having an input coupled to the receiving coil and an output coupled to an input of a switched-capacitor conversion chip, and configured to convert the AC power supply into a first direct-current (DC) power supply; and
the switched-capacitor conversion chip, having an output coupled to the battery, and configured to output a second DC power supply based on the first DC power supply, and charge the battery based on the second DC power supply, a voltage of the second DC power supply being lower than a voltage of the first DC power supply, and a current of the second DC power supply being greater than a current of the first DC power supply; and
a processor, wherein:
the switched-capacitor conversion chip is configured to detect a path current, and enter into a current limiting mode in response to the path current being greater than or equal to a sum of a current threshold and a first current deviation, the first current deviation being greater than or equal to 0, and lower than the current threshold;
the processor is configured to output a first control instruction for adjusting the current threshold according to a path current expected presently; and
the switched-capacitor conversion chip is configured to adjust the current threshold according to the first control instruction.
14. The charging system of claim 13 , wherein the wireless charging receiver comprises a power management chip (PMIC), wherein:
the switched-capacitor conversion chip comprises a first-stage switched-capacitor conversion chip and a second-stage switched-capacitor conversion chip;
an input of the first-stage switched-capacitor conversion chip is coupled to the receiving chip, an output of the first-stage switched-capacitor conversion chip is coupled to an input of the second-stage switched-capacitor conversion chip and an input of the power management chip, and an output of the second-stage switched-capacitor conversion chip and an output of the power management chip are coupled to the battery;
the first-stage switched-capacitor conversion chip is configured to output a third DC power supply based on the first DC power supply, a voltage of the third DC power supply being lower than a voltage of the first DC power supply, and a current of the third DC power supply being greater than a current of the first DC power supply;
the second-stage switched-capacitor conversion chip is configured to output the second DC power supply based on the third DC power supply, and charge the battery with a first current based on the second DC power supply, a voltage of the second DC power supply being lower than a voltage of the third DC power supply, and a current of the second DC power supply being greater than a current of the third DC power supply; and
the power management chip is configured to charge the battery with a second current based on the second DC power supply, the second current being lower than the first current.
15. The charging system of claim 13 , wherein, the switched-capacitor conversion chip is configured to enter into the current limiting mode by at least one of:
increasing an on-resistance of an internal switch of the switched-capacitor conversion chip;
disconnecting an internal switch for charging a charging capacitor in the switched-capacitor conversion chip;
connecting the charging capacitor to an output of the switched-capacitor conversion chip in parallel for discharging; and
reducing a charging duration of the charging capacitor in the switched-capacitor conversion chip,
the processor is configured to reduce an output voltage of the receiving chip of the wireless charging receiver according to an on-resistance of an internal switch of the switched-capacitor conversion chip, a conductive state of the internal switch of the switched-capacitor conversion chip, or a charging duration of a charging capacitor in the switched-capacitor conversion chip.
16. The charging system of claim 13 , wherein the processor is configured to output a second control instruction for controlling the switched-capacitor conversion chip to enter into a shoot-through state in response to entering a constant-voltage charging period; and
the switched-capacitor conversion chip is configured to enter into the shoot-through state according to the second control instruction.
17. The charging system of claim 13 , wherein the wireless charging transmitter comprises:
a charger;
a transmitting chip, having an input coupled to the charger, and an output coupled to a transmitting coil, and configured to communicate with the charger based on a control protocol, control the charger to output a voltage of DC power supply, and convert the DC power supply into an alternating current (AC) power supply; and
the transmitting coil, configured to convert the AC power supply into an alternating magnetic field.