Working principle of digital power amplifier module
Release Time:
2023-06-26
Working principle of digital power amplifier module
Working principle of switching power supply The input 110/220V AC first passes through two-stage second-order filters to isolate the internal and external interference of the module; the 110/220V setting is completed through the fuse line. The ballast filter circuit converts the AC power into a DC power of about 300V, and the DC/DC converter outputs various low-voltage DC power required by the power amplifier and realizes isolation. The principle of digital power amplifier input analog audio signal is first preprocessed (such as volume adjustment, pressure limit, etc.), and then sent to the error amplifier together with the feedback audio signal to output the audio error signal, and the triangular wave generator generates a high linearity triangular wave signal and audio The error signal is sent to the comparator together to generate the PWM signal. The PWM signal is sent to the driver for pre-amplification, and a dead time is inserted between the driving signals to avoid the loss caused by the simultaneous conduction of two FETs of the same bridge arm.
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