AMPLIFIER CURRENT CONSUMPTION CONTROL

摘要

The audio amplifier includes a variable gain amplifier receiving the input audio signal and providing the output signal, whereby the output signal corresponds to the input signal amplified by a limiter gain. The audio amplifier further includes a limiter gain calculation unit, thus the input signal is amplified by the limiter gain. A control unit receives a signal representative of the input signal and is configured to estimate, based on a mathematical model, the input current or the total output current of the audio amplifier thus providing an estimated current signal corresponding to (and resulting from) the output signal, whereby the limiter gain calculation unit is configured to calculate, dependent on the estimation, the limiter gain such that the actual input current or the total output current of the audio amplifier does not exceed a threshold current value.

主权项

1. An audio amplifier comprising:
a variable gain amplifier that receives an input audio signal and amplifies the input audio signal by a limiter gain to provide an amplified output signal; a sensor that senses and provides an audio amplifier current signal indicative of the current provided by the audio amplifier; a control unit that includes an adaptive filter that receives a first signal indicative of the input audio signal and a second signal indicative of the audio amplifier current, and provides an estimated current signal indicative of an estimation of the audio amplifier current; and a limiter gain calculation unit that calculates, dependent on the estimated current signal, the limiter gain such that the amplified output signal does not exceed a threshold current value.