THE SPEAKER DRIVE SYSTEM USING PWM PULSE SWITCHING

摘要

PURPOSE: A digital power amplifier switching drive system is provided to prevent an output signal from being deformed by minimizing time deviation between a low side and a hard side. CONSTITUTION: An error amplifier(10) revises an error by amplifying the error using an output feedback signal for an input audio signal. A PWM generator(20) generates a PWM pulse with a different cycle according to an audio signal which is input by the error amplifier. A switching controlling part(30) recognizes a PWM pulse which is input by the positive output stage(+) and the negative output stage(-) of the PWM pulse which is generated from the PWM generator. The switching controlling part switches the MOS(Metaloxide Semiconductor) field effect transistor(50) of a hide side band or the MOS field effect transistor(40) of a low side band according to the change of a positive period. The MOS field effect transistor outputs a PWM pulse signal according to a switching control signal. An amplified signal is outputted through a speaker(70) passing through a low pass filter(60).