Patent ID: 9257942
Filing Date: 2016-02-09
CPC Classification: H03F

Claim Text:
1. An audio amplifier apparatus, suitable for driving a loudspeaker, the audio amplifier apparatus comprising: a soft charge unit, coupled to the loudspeaker through an output terminal, and supplying a driving current according to a first control signal to soft charge the loudspeaker, so as to gradually increase a voltage level on the output terminal; a first amplification module, coupled to the output terminal, receiving an audio signal according to the first control signal, and amplifying the audio signal to output a first amplified signal for driving the loudspeaker, wherein the first amplification module comprises: a second amplification module, coupled to the output terminal, receiving the audio signal according to a second control signal, and amplifying the audio signal to output a second amplified signal for driving the loudspeaker, a first resistor, having a first end and a second end, wherein the first end of the first resistor is coupled to the output terminal of the first amplifier; a first switch, having a first terminal and a second terminal, and turned on or off according to the first control signal, wherein the first terminal of the first switch receives the audio signal, and the second terminal of the first switch is coupled to the input terminal of the first amplifier and the first end of the first capacitor; and a second switch, having a first terminal and a second terminal, and turned on or off according to the first control signal, wherein the first terminal of the second switch is coupled to the second end of the first resistor, and the second terminal of the second switch is coupled to the output terminal of the first amplifier, wherein when the voltage level on the output terminal is not equal to the predetermined voltage level, the first switch and the second switch are turned on according to the first control signal, and when the voltage level on the output terminal is equal to the predetermined voltage level, the first switch and the second switch are turned off according to the first control signal.