Patent ID: 7116160

Claim:
A booster comprising: a boosting circuit for boosting an input voltage to a predetermined output voltage, the boosting circuit comprising a transistor for controlling the boosting circuit to adjust the output voltage; an oscillator for generating oscillating signals when the boosting circuit boosts the input voltage; and a voltage detector electrically connected to the boosting circuit for controlling the transistor of the boosting circuit to switch off and prevent the boosting circuit from adjusting the output voltage when detecting that the output voltage of the boosting circuit reaches a predetermined voltage, the voltage detector comprising: a diode; a first resistor; a second resistor; a third resistor; and a bipolar junction transistor (BJT); wherein an emitter of the BJT is grounded, a collector of the BJT is electrically connected to a first end of the first resistor, a base of the BJT is electrically connected to first ends of the second and the third resistors, a second end of the second resistor is grounded, a second end of the third resistor is electrically connected to a positive pole of the diode, and a negative pole of the diode is electrically connected to both a second end of the first resistor and the output voltage of the boosting circuit.