Patent ID: 6930541

Claim:
A voltage clamper for adjusting an input voltage to generate an output voltage, the voltage clamper comprising: a bias circuit for generating at least one bias voltage according to the input voltage; a voltage drop circuit for controlling the input voltage to generate a voltage drop, the voltage drop circuit comprising: a predetermined voltage drop unit electrically connected to an output terminal of the voltage clamper and the input voltage for applying a predetermined voltage drop to the input voltage to adjust the output voltage; and a first voltage drop unit electrically connected to the output terminal of the voltage clamper and the input voltage for applying a first voltage drop to the input voltage to adjust the output voltage; wherein the predetermined voltage drop unit is always activated, and the activation of the first voltage drop unit is controlled by a voltage detection circuit and the voltage detection circuit electrically connected to the voltage drop circuit and the bias circuit for adjusting the voltage drop generated from the voltage drop circuit according to the bias voltage to generate the output voltage.