Abstract: Multifrequency control method, a novel control method for switching converters, is proposed and investigated in this paper. The control pulse with different frequency which is determined according to the voltage intervals of the sampled output voltage at the end of previous switching period is applied to regulate the output voltage. In contrast to bifrequency control, the multifrequency control not only extends the output power range, but also reduces the output voltage ripple; it has merit of simple control algorithm, strong stability, fast dynamic response, low electromagnetic interference (EMI) noise, and high efficiency at light load. Experimental results demonstrate the correctness of the theoretical analyses.