Patent ID: 8295510

Claim:
A power-saving amplifying device comprising: a volume controller for transmitting a control signal to a micro controller unit for adjusting a volume; the micro controller unit for receiving the control signal from the volume controller to generate a decision signal and an output value of a PWM signal according to the received control signal, the micro controller unit transmitting the decision signal to a volume controlling circuit and the PWM signal to a DC integrating circuit; a volume controlling circuit for receiving the decision signal from the micro controller unit and an audio signal for obtaining the volume setup value, and then transmitting the volume setup value and the audio signal to the power amplifier; the DC integrating circuit for receiving the PWM signal from the micro controller unit and integrating the PWM signal into an DC voltage, and then transmitting the DC voltage to a power supply; the power supply for receiving the DC voltage from the DC integrating circuit to transmitting a power control signal to a power amplifier to increase or decrease the output voltage thereof; the power amplifier for receiving the power control signal from the power supply and the audio signal from the volume controlling circuit, and then amplifying the audio signal according to the power control signal to drive a speaker to output a sound.