PWM FREQUENCY CONTROL METHOD AND DEVICE FOR D-CLASS POWER AMPLIFIER

摘要

Disclosed is a PWM frequency control method for a D-class power amplifier, including: setting different PWM frequencies for a D-class power amplifier successively; acquiring the signal to noise ratios of a frequency modulation (FM) broadcast signal received by an FM receiving module successively under different PWM frequencies of the D-class power amplifier; and acquiring the PWM frequency value corresponding to the signal to noise ratio maximum value in the signal to noise ratios, taking the PWM frequency value as the best PWM frequency, and setting the best PWM frequency as the PWM frequency of the D-class power amplifier. Disclosed at the same time is a PWM frequency control device for a D-class power amplifier. The method and device in the present invention can be applied to effectively reduce the electromagnetic interference to the FM receiving module by the D-class power amplifier, so that the user can receive a distinct radio broadcast signal.