Patent ID: 8421428

Claim:
A switching power converter, comprising: a converting circuit used to convert an input voltage with electric power to an output voltage with stable electric power according to a control signal, the converting circuit having a detecting element, and the detecting element having a first detecting end and a second detecting end; a current trigger circuit, comprising: at least one bias voltage unit, each of the bias voltage units coupled to the first detecting end and providing a bias voltage signal, wherein the at least one bias voltage unit comprises a first current source and a second current source; and a trigger unit coupled to the at least one bias voltage unit and generating at least one current trigger signal according to the voltage level of the first detecting end, a voltage level of the second detecting end, and the at least one bias voltage signal; and a processing circuit receiving the at least one current trigger signal generated by the current trigger circuit and generating the control signal according to the at least one current trigger signal, wherein the at least one current trigger circuit further comprises at least one first transistor switch and a second transistor switch, each of the first transistor switches is coupled to the first current source of the corresponding bias voltage unit and switched according to a trigger control signal, and the second transistor switch is coupled to the second current source and kept conductive.