Patent ID: 7969232
Filing Date: 2011-06-28
Classification: H02M

Abstract:
1. A booster, comprising: a charge pump circuit, controlled by a switching signal to generate an actual voltage according to a basis voltage, wherein the actual voltage is a product of the basis voltage multiplied by a first preset multiplier; and a voltage detection circuit, coupled to the charge pump circuit for selecting one of a plurality of first multipliers to serve as the first preset multiplier according to a comparison result between the basis voltage and a target voltage, and generating the switching signal corresponding to the first preset multiplier, wherein the voltage detection circuit comprises: a plurality of first series resistors, coupled to the basis voltage for providing a plurality of first divided voltages, wherein each first divided voltage is a product of the basis voltage multiplied by a ratio of each corresponding first multiplier to a maximum of a plurality of second multipliers; a plurality of second series resistors, coupled to a reference voltage for providing a second divided voltage, wherein the second divided voltage is a product of the reference voltage multiplied by a ratio of a second preset multiplier to the maximum of the second multipliers; a plurality of comparators, respectively comparing the first divided voltages with the second divided voltage, and thereby generating a plurality of output signals; and a logic circuit, selecting a minimum multiplier among the first multipliers which make the corresponding first divided voltages thereof greater than the second divided voltage to serve as the first preset multiplier according to the output signals, and generating the switching signal.