Power supply circuit, power supply method, audio power amplifier and integrated circuit

A method of supplying power to an audio power amplifier, comprising:

• detecting a voltage of an audio signal input to the audio power amplifier, wherein the voltage of the audio signal corresponds to output power of the audio power amplifier;
• determining a target reference voltage range based on a voltage range of the audio signal within a predetermined time period, wherein the target reference voltage range is selected from a plurality of predetermined reference voltage ranges, and the voltage range of the audio signal within the predetermined time period is included within the target reference voltage range;
• and
• based on the target reference voltage range, generating a power supply voltage that matches the output power of the audio power amplifier to supply power to the audio power amplifier.

An electronic device, comprising:

• an audio power amplifier, which receives an audio signal and amplifies the audio signal;
• and
• a speaker for playing the audio signal,
• wherein the audio power amplifier comprises an audio power amplification circuit;
• and a power supply circuit which is used to provide power for the audio power amplification circuit, and
• wherein the power supply circuit comprises:
• a detection sub-circuit for detecting a voltage of an audio signal input to the audio power amplifier, wherein the voltage of the audio signal corresponds to output power of the audio power amplifier;
• a control sub-circuit for determining a target reference voltage range based on a voltage range of the audio signal within a predetermined time period, wherein the target reference voltage range is selected from a plurality of predetermined reference voltage ranges, and the voltage range of the audio signal within the predetermined time period is included within the target reference voltage range;
• and
• a power supply sub-circuit for generating a power supply voltage that matches the output power of the audio power amplifier based on the target reference voltage range, so as to supply power to the audio power amplifier.