Charging system, method and device for controlling charging system, and electronic device
A charging system includes: a power management integrated circuit, a bidirectional voltage conversion circuit, a controller and a battery level detection circuit. The bidirectional voltage conversion circuit is configured to work in a working mode including at least a boost mode and a buck mode. The controller has a first terminal. An input terminal of the battery level detection circuit is connected to a battery, an output terminal of the battery level detection circuit is connected to the first input terminal of the controller, and the battery level detection circuit is configured to detect a voltage and a current of the battery and transmit the voltage and the current of the battery to the controller. The controller is configured to control the working mode of the bidirectional voltage conversion circuit and a working state of the power management integrated circuit according to the battery voltage and the current.
1. A charging system, comprising:
a power management integrated circuit;
a bidirectional voltage conversion circuit, the bidirectional voltage conversion circuit being configured to work in a working mode comprising at least a boost mode and a buck mode;
a controller having a first input terminal; and
a battery level detection circuit,
an input terminal of the battery level detection circuit being connected to a battery,
an output terminal of the battery level detection circuit being connected to the first input terminal of the controller, and
the battery level detection circuit being configured to detect a voltage and a current of the battery and transmit the voltage and the current of the battery to the controller, and
wherein the controller is configured to control the working mode of the bidirectional voltage conversion circuit and a working state of the power management integrated circuit according to the voltage and the current of the battery.
2. The charging system according to claim 1 , wherein:
the boost mode of the bidirectional voltage conversion circuit has a voltage conversion ratio of 1:N, and the buck mode of the bidirectional voltage conversion circuit has a voltage conversion ratio of N:1, where N is a positive number greater than 1, and
the controller is further configured to:
when the charging system works in a battery charging state, control the working mode of the bidirectional voltage conversion circuit to be the boost mode, and control an output voltage of a charging branch in the power management integrated circuit according to the voltage and the current of the battery, and a value of N, and
when the charging system works in a battery discharging state, control the working mode of the bidirectional voltage conversion circuit to be the buck mode, and control a discharging branch in the power management integrated circuit to be in a working state.
3. The charging system according to claim 2 , wherein the controller is further configured to:
when the charging system works in the battery charging state, periodically control the output voltage of the charging branch in the power management integrated circuit according to the voltage and the current of the battery, and the value of N, until the voltage reaches a first threshold, and the current reaches a second threshold.
4. The charging system according to claim 2 , wherein the controller is further configured to:
when the charging system works in the battery charging state and the current is less than a second threshold,
determine a reference output voltage of the power management integrated circuit according to the voltage of the battery and the value of N,
determine a target output voltage of the charging branch in the power management integrated circuit according to the reference output voltage and a preset voltage margin, and
adjust a turn-on frequency and a duty cycle of a power switching device in the power management integrated circuit, to allow the output voltage of the charging branch to be the target output voltage.
5. The charging system according to claim 1 , wherein a first input terminal of the power management integrated circuit is connected to a voltage input, a first output terminal and a second input terminal of the power management integrated circuit are connected to a first terminal of the bidirectional voltage conversion circuit, a second output terminal of the power management integrated circuit is connected to a power supply terminal of the controller, and a control terminal of the power management integrated circuit is connected to a first output terminal of the controller, and
wherein a second terminal of the bidirectional voltage conversion circuit is connected to the battery, and a control terminal of the bidirectional voltage conversion circuit is connected to a second output terminal of the controller.
6. The charging system according to claim 1 , further comprising a capacitive voltage conversion circuit and a handshake circuit,
wherein an input terminal of the handshake circuit is connected to the voltage input, an output terminal of the handshake circuit is connected to a second input terminal of the controller, and the handshake circuit is configured to communicate with a power adapter to determine a type of the power adapter and send the type of the power adapter to the controller;
wherein the controller is further configured to control the capacitive voltage conversion circuit to work, and control the power management integrated circuit and the bidirectional voltage conversion circuit to stop working, when the type of the power adapter matches the capacitive voltage conversion circuit; and
wherein the controller is further configured to control the capacitive voltage conversion circuit to stop working, and control the power management integrated circuit and the bidirectional voltage conversion circuit to work, when the type of the power adapter does not match the capacitive voltage conversion circuit.
7. The charging system according to claim 1 , further comprising an over voltage protection circuit, wherein the over voltage protection circuit is disposed between a voltage input and the power management integrated circuit.
8. A method for controlling a charging system, the charging system comprising:
a power management integrated circuit;
a bidirectional voltage conversion circuit, the bidirectional voltage conversion circuit being configured to work in a working mode comprising at least a boost mode and a buck mode;
a controller having a first input terminal; and
a battery level detection circuit,
an input terminal of the battery level detection circuit being connected to a battery,
an output terminal of the battery level detection circuit being connected to the first input terminal of the controller, and
the battery level detection circuit being configured to detect a voltage and a current of the battery and transmit the voltage and the current of the battery to the controller, and
wherein the controller is configured to control the working mode of the bidirectional voltage conversion circuit and a working state of the power management integrated circuit according to the voltage and the current of the battery, and
wherein the method comprises:
determining a voltage and a current of a battery to be charged, and
controlling the working mode of the bidirectional voltage conversion circuit and the working state of the power management integrated circuit according to the voltage and the current of the battery.
9. The method according to claim 8 , wherein the boost mode of the bidirectional voltage conversion circuit has a voltage conversion ratio of 1:N, and the buck mode of the bidirectional voltage conversion circuit has a voltage conversion ratio of N:1, where N is a positive number greater than 1, and
wherein controlling the working mode of the bidirectional voltage conversion circuit and the working state of the power management integrated circuit according to the voltage and the current of the battery comprises:
when the charging system works in a battery charging state, controlling the working mode of the bidirectional voltage conversion circuit to be the boost mode, and controlling an output voltage of a charging branch in the power management integrated circuit according to the voltage and the current of the battery, and a value of N, and
when the charging system works in a battery discharging state, controlling the working mode of the bidirectional voltage conversion circuit to be the buck mode, and controlling a discharging branch in the power management integrated circuit to be in a working state.
10. The method according to claim 9 , wherein controlling the output voltage of the charging branch in the power management integrated circuit according to the voltage and the current of the battery, and the value of N comprises:
periodically controlling the output voltage of the charging branch in the power management integrated circuit according to the voltage and the current of the battery, and the value of N, until the voltage reaches a first threshold, and the current reaches a second threshold.
11. The method according to claim 9 , wherein controlling the output voltage of the power management integrated circuit according to the voltage and the current of the battery, and the value of N comprises:
determining a reference output voltage of the power management integrated circuit according to the voltage of the battery and the value of N when the current is less than a second threshold,
determining a target output voltage of the charging branch in the power management integrated circuit according to the reference output voltage and a preset voltage margin,
adjusting a turn-on frequency and a duty cycle of a power switching device in the power management integrated circuit, to allow the output voltage of the charging branch to be the target output voltage.
12. The method according to claim 8 , wherein the charging system further comprises a capacitive voltage conversion circuit, and the method further comprises:
determining a type of a power adapter currently connected with the charging system;
controlling the capacitive voltage conversion circuit to work, and controlling the power management integrated circuit and the bidirectional voltage conversion circuit to stop working, when the type of the power adapter matches the capacitive voltage conversion circuit; and
controlling the capacitive voltage conversion circuit to stop working, and controlling the power management integrated circuit and the bidirectional voltage conversion circuit to work, when the type of the power adapter does not match the capacitive voltage conversion circuit.
13. An electronic device comprising a charging system, wherein the charging system comprises:
a power management integrated circuit;
a bidirectional voltage conversion circuit, the bidirectional voltage conversion circuit being configured to work in a working mode comprising at least a boost mode and a buck mode;
a controller having a first input terminal; and
a battery level detection circuit,
an input terminal of the battery level detection circuit being connected to a battery,
an output terminal of the battery level detection circuit being connected to the first input terminal of the controller, and
the battery level detection circuit being configured to detect a voltage and a current of the battery and transmit the voltage and the current of the battery to the controller, and
wherein the controller is configured to control the working mode of the bidirectional voltage conversion circuit and a working state of the power management integrated circuit according to the voltage and the current of the battery.
14. The electronic device according to claim 13 , wherein the boost mode of the bidirectional voltage conversion circuit has a voltage conversion ratio of 1:N, and the buck mode of the bidirectional voltage conversion circuit has a voltage conversion ratio of N:1, where N is a positive number greater than 1, and the controller is further configured to:
when the charging system works in a battery charging state, control the working mode of the bidirectional voltage conversion circuit to be the boost mode, and control an output voltage of a charging branch in the power management integrated circuit according to the voltage and the current of the battery, and a value of N, and
when the charging system works in a battery discharging state, control the working mode of the bidirectional voltage conversion circuit to be the buck mode, and control a discharging branch in the power management integrated circuit to be in a working state.
15. The electronic device according to claim 14 , wherein the controller is further configured to:
when the charging system works in the battery charging state, periodically control the output voltage of the charging branch in the power management integrated circuit according to the voltage and the current of the battery, and the value of N, until the voltage reaches a first threshold, and the current reaches a second threshold.
16. The electronic device according to claim 14 , wherein the controller is further configured to:
when the charging system works in the battery charging state and the current is less than a second threshold,
determine a reference output voltage of the power management integrated circuit according to the voltage of the battery and the value of N,
determine a target output voltage of the charging branch in the power management integrated circuit according to the reference output voltage and a preset voltage margin, and
adjust a turn-on frequency and a duty cycle of a power switching device in the power management integrated circuit, to allow the output voltage of the charging branch to be the target output voltage.
17. The electronic device according to claim 13 , wherein the first input terminal of the power management integrated circuit is connected to a voltage input, a first output terminal and a second input terminal of the power management integrated circuit are connected to a first terminal of the bidirectional voltage conversion circuit, a second output terminal of the power management integrated circuit is connected to a power supply terminal of the controller, and a control terminal of the power management integrated circuit is connected to a first output terminal of the controller, and
wherein a second terminal of the bidirectional voltage conversion circuit is connected to the battery, and a control terminal of the bidirectional voltage conversion circuit is connected to a second output terminal of the controller.
18. The electronic device according to claim 13 , further comprising a capacitive voltage conversion circuit and a handshake circuit,
wherein an input terminal of the handshake circuit is connected to the voltage input, and an output terminal of the handshake circuit is connected to a second input terminal of the controller, to allow the handshake circuit to communicate with a power adapter to determine a type of the power adapter and send the type of the power adapter to the controller;
wherein the controller is further configured to control the capacitive voltage conversion circuit to work, and control the power management integrated circuit and the bidirectional voltage conversion circuit to stop working, when the type of the power adapter matches the capacitive voltage conversion circuit; and
wherein the controller is further configured to control the capacitive voltage conversion circuit to stop working, and control the power management integrated circuit and the bidirectional voltage conversion circuit to work, when the type of the power adapter does not match the capacitive voltage conversion circuit.
19. The electronic device according to claim 13 , further comprising an over voltage protection circuit, wherein the over voltage protection circuit is disposed between a voltage input and the power management integrated circuit.
20. The electronic device according to claim 13 , further comprising one or more connectors.