Patent ID: 8653883

Claim:
A voltage doubler, comprising: a charge pump powered by a first voltage and having a capacitor as an energy storage element, wherein the charge pump receives an oscillating control signal to charge the capacitor accordingly and thereby to control a second voltage provided by the capacitor; a comparator, coupled to the charge pump to receive the second voltage provided by the capacitor and output a comparison result presenting whether the second voltage is greater than a target value; a fundamental oscillation signal generator, generating a fundamental oscillation signal according to the comparison result, wherein the fundamental oscillation signal generator stops generating the fundamental oscillation signal when the comparison result shows that the second voltage is greater than the target value; and an oscillating control signal generator, generating the oscillating control signal by selectively blocking status changes of the fundamental oscillation signal according to the comparison result and an electric current consumption status at an output terminal of the charge pump, wherein the oscillating control signal generator comprises: a rising edge detector, enabled by a first enable signal to detect rising edges of the fundamental oscillation signal; a falling edge detector, enabled by a second enable signal to detect falling edges of the fundamental oscillation signal; a logic gate, having an output terminal outputting a pulse when the rising edge detector detects a rising edge of the fundamental oscillation signal or the falling edge detector detects a falling edge of the fundamental oscillation signal; and a D flip-flop oscillator coupled to the output terminal of the logic gate and having an output terminal outputting the oscillating control signal, wherein by the D flip-flop oscillator a status change occurs at the oscillating control signal in accordance with the pulse generated by the logic gate, wherein the disabling of the rising edge detector and the falling edge detector implement the blockings of the status changes of the fundamental oscillation signal.