Patent ID: 9405354
Filing Date: 2016-08-02
CPC Classification: G06F,H02M

Claim Text:
1. A controlling method utilized in a power supply comprising a switch and an inductive element, the controlling method comprising: detecting an inductive current flowing through the inductive element; determining the power supply is operated under a normal loading state or an overloaded state according to a feedback signal; controlling a peak of the inductive current to be smaller than or equal to a constant magnitude; controlling the switch to be operated in a first fixed frequency when the power supply is under the normal loading state and operated in a second fixed frequency when the power supply is under the overloaded state, wherein the second fixed frequency is higher than the first fixed frequency; calculating a duration during which the power supply is operated under the overloaded state; and ceasing the operation of the switch when the duration exceeds a tolerable duration; wherein the tolerable duration is independent of variation of an operating frequency of the switch, and the operating frequency of the switch increases according to the feedback signal from the first fixed frequency to the second fixed frequency.