Patent ID: 8538045
Filing Date: 2013-09-17
Classification: H02J,H03F

Abstract:
1. A device for compensating a supply voltage from a power supply, the supply voltage used for powering an audio device, the device comprising: a detecting circuit for detecting an audio signal from the audio device, generating a first level signal when detecting that the audio signal has a first characteristic, and generating a second level signal when detecting that the audio signal has a second characteristic; and a storing circuit for storing energy according to the first level signal, and releasing the stored energy to increase the supply voltage according to the second level signal; wherein the power supply comprises a first terminal for providing the supply voltage and a second terminal for providing an input voltage, the detecting circuit comprises a control unit, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first transistor, the control unit comprises an input pin and an output pin, one end of the first resistor connects the second terminal of the power supply, the other end of the first resistor is grounded through the second resistor, a terminal of the audio device is connected between the first resistor and the second resistor, the audio device is connected to the second terminal of the power supply, a base of the first transistor is connected between the first resistor and the second resistor, one end of the third resistor connects the second terminal of the power supply, the other end of the third resistor connects a collector of the first transistor, one end of the fourth resistor connects an emitter of the first transistor, the other end of the fourth resistor is grounded, the collector of the first transistor further connects the input pin, one end of the fifth resistor connects the input pin, the other end of the fifth resistor is grounded.