Control of a switched mode power supply and linear power supply for an audio device

摘要

An audio device and an output method thereof are provided. The audio device includes: an envelope detector configured to detect an envelope of an input audio signal; a power supply which includes a linear power supply (LPS) and a switching-mode power supply (SMPS); an amplifier configured to amplify the input audio signal; an output unit configured to output the audio signal amplified by the amplifier; and a controller configured to compare a voltage level of the detected envelope with a preset level, select one of the LPS and the SMPS based on a result of the comparison, and control the power supply to supply power from the selected one of the LPS and the SMPS to the amplifier.

主权项

1. An audio device comprising:
an envelope detector configured to detect an envelope of an input audio signal; a power supply which comprises a linear power supply (LPS) and a switching-mode power supply (SMPS); an amplifier configured to amplify the input audio signal; an output unit configured to output the audio signal amplified by the amplifier; and a controller configured to compare a voltage level of the detected envelope with a first preset voltage level and a second preset voltage level, select one of the LPS and the SMPS based on a result of the comparison, and control the power supply to supply power from the selected one of the LPS and the SMPS to the amplifier, wherein the second preset voltage level exceeds the first preset voltage level, wherein the controller is further configured to select the LPS in response to the voltage level of the detected envelope falling to be lower than or equal to the first preset voltage level, select the SMPS in response to the voltage level of the detected envelope rising to be higher than or equal to the second preset voltage level, and set an output voltage level of the LPS to the first preset voltage level at a time when the voltage level of the detected envelope falls to the first preset voltage level, and set an output voltage level of the SMPS to the second preset voltage level at a time when the voltage level of the detected envelope rises to the second preset voltage level.