Switching power converter control circuit

A switching control circuit on a power converter according to the invention, comprising an input circuit and a clock generator. The input circuit receives a feedback signal to generate a switching signal; clock generator generates a clock signal, to determine a switching frequency of the switching signal. Output feedback signal to an output associated with the power converter, a switching signal for switching the transformer of the power converter, the power converter to adjust the switching frequency of the switching signal changes from a low frequency to high frequency before, the pulse width of the switching signal It will be reduced.