Power control method and related charging system

1. A power control method for a charging system, comprising:

detecting a power signal and an input voltage of the power signal;

determining a charging protocol supported by the power signal; and

determining whether to conduct a power switching circuit or not according to the input voltage of the power signal and the charging protocol supported by the power signal to provide power for an amplifier chip of the charging system;

wherein the power switching circuit is parallel to a boosting circuit.

2. The power control method of claim 1 , wherein the power signal is qualified for a power delivery (PD) charging protocol or a quick charge (QC) charging protocol.

3. The power control method of claim 2 , wherein the step of determining whether to conduct the power switching circuit or not according to the input voltage of the power signal and the charging protocol supported by the power signal comprises:

when the power signal is qualified for the QC charging protocol, conducting the power switching circuit to provide the power for the amplifier chip of the charging system.

4. The power control method of claim 2 , wherein the step of determining whether to conduct the power switching circuit or not according to the input voltage of the power signal and the charging protocol supported by the power signal comprises:

comparing a first input voltage of the power signal and a boosting voltage of the boosting circuit of the charging system when the power signal is qualified for the PD charging protocol; and

not conducting the power switching circuit when the first input voltage is smaller than the boosting voltage, a charging circuit of the charging system providing the power for the amplifier chip via the boosting circuit; or

conducting the power switching circuit when the first input voltage is larger than or equal to the boosting voltage.

5. The power control method of claim 2 , further comprising:

loading parameters of the amplifier chip according to the charging protocol supported by the power signal to change a volume curve and/or a gain of the amplifier chip.

6. The power control method of claim 2 , wherein when no power signal is detected, a charging battery of the charging system provides the power for the amplifier chip via the boosting circuit.

7. The power control method of claim 6 , wherein a diode is coupled to an output terminal of the boosting circuit.

8. A charging system, comprising:

a charging circuit, configured to receive a power signal from a transformer to detect an input voltage of the power signal to determine a charging protocol supported by the power signal;

a power switching circuit, coupled to the charging circuit, configured to receive the power signal of the transformer; and

a microcontroller, coupled to the charging circuit and the power switching circuit, configured to read the power signal detected by the charging circuit, the input voltage and the charging protocol supported by the power signal, to determine whether to conduct a power switching circuit or not to provide power for an amplifier chip of the charging system;

wherein the power switching circuit is parallel to a boosting circuit.

9. The charging system of claim 8 , wherein the power signal is qualified for a power delivery (PD) charging protocol or a quick charge (QC) charging protocol.

10. The charging system of claim 9 , wherein when the charging circuit determines that the power signal is qualified for the QC charging protocol, the microcontroller conducts the power switching circuit to provide the power for the amplifier chip of the charging system.

11. The charging system of claim 9 , wherein the charging circuit compares a first input voltage of the power signal and a boosting voltage of the boosting circuit of the charging system when the power signal is qualified for the PD charging protocol, the microcontroller does not conduct the power switching circuit when the first input voltage is smaller than the boosting voltage, a charging circuit of the charging system provides the power for the amplifier chip via the boosting circuit; or the microcontroller conducts the power switching circuit when the first input voltage is larger than or equal to the boosting voltage.

12. The charging system of claim 9 , wherein the microcontroller is further configured to load parameters of the amplifier chip according to the charging protocol supported by the power signal to change a volume curve and/or a gain of the amplifier chip.

13. The charging system of claim 9 , wherein when no power signal is detected, a charging battery of the charging system provides the power for the amplifier chip via the boosting circuit.

14. The charging system of claim 13 , wherein a diode is coupled to an output terminal of the boosting circuit.