Patent ID: 8368376
Filing Date: 2013-02-05
Classification: G05F

Abstract:
1. An electronic device capable of regulating a power switch to dissipate power, comprising: a power supply device, for supplying a power voltage; a power switch, for providing an output voltage; and a current regulating circuit comprising: an adaptive control unit, for outputting a regulating signal according to a voltage difference between the power voltage and the output voltage; Wherein the adaptive control unit comprises: a voltage divider, for providing a plurality of standard voltages; a multiplexer, coupled to the voltage divider, for selecting a standard voltage from the plurality of standard voltages according to a first selection signal, to output a feedback reference voltage; a comparator, for comparing the feedback reference voltage and the output voltage, to output a trigger signal; a counter, for increasing a count value according to a timing signal, and resetting the count value according to the trigger signal; a logic controller, coupled to the counter, for outputting the first selection signal and a second selection signal according to the count value; and a regulated current generator, for selecting a reference current from a plurality of reference currents according to the second selection signal, to output the regulating signal of the adaptive control unit; and a switch control unit, for outputting a switch control signal to a control terminal of the power switch according to the regulating signal, to control current flowing through the power switch.