POWER SUPPLY METHOD FOR AVOIDING AUDIO NOISE AND POWER SUPPLY APPARATUS FOR AVOIDING AUDIO NOISE

摘要

A power supply apparatus (10) includes a voltage input side (102), a power switch circuit (104), a voltage output side (106), a pulse width modulation signal generating circuit (108) and a burst frequency detection circuit (110). According to a pulse width modulation signal (114), the pulse width modulation signal generating circuit (108) controls the power switch circuit (104), so that the power supply apparatus (10) enters a burst mode. The burst frequency detection circuit (110) detects a burst frequency of the power switch circuit (104). The burst frequency detection circuit (110) informs the pulse width modulation signal generating circuit (108) that the burst frequency is in an audio frequency range if the burst frequency is in the audio frequency range. The power supply apparatus (10) leaves from the burst mode to avoid audio noise.

主权项

1. A power supply method comprising:
a. a power supply apparatus (10) leaving from a burst mode to avoid audio noise when the power supply apparatus (10) is in the burst mode and a burst frequency of the power supply apparatus (10) is in an audio frequency range.