Control method of power converter

A control method of a power converter, applicable for modulating a power signal outputted from said power converter to a load according to a feedback signal of said load, comprising the steps of:

• (A) receiving a reference signal to determine whether or not to output a modulation signal;
• (B) receiving said modulation signal to determine whether or not to output an electric conduction signal based on the working condition of a transformer unit in said power converter;
• (C) receiving said electric conduction signal to determine whether or not to output an oscillation signal of said transformer unit in said power converter;
• (D) modulating the duty cycle and frequency of said modulation signal simultaneously according to a feedback signal, if said feedback signal is inputted;
• (E) receiving said modulation signal after the duty cycle and frequency are modulated simultaneously to change a power operating time interval for outputting said electric conduction signal;
• and
• (F) receiving said electric conduction signal after said power operating time interval is changed to determine whether or not to output said oscillation signal of said transformer unit in said power converter.