System and method for multi-phase power conversion and control

A control system for controlling a multi-phase power conversion system, comprising:

• a pulse width modulation (PWM) comparator, configured to generate a first PWM signal based on a ramp signal, a voltage reference signal and a first voltage signal, the first voltage signal being a feedback voltage from the multi-phase power conversion system, the multi-phase power conversion system comprising N switching power converters, and N being an integer greater than 1;
• and
• a first circuit, coupled with the PWM comparator and configured to:
• receive the first PWM signal from the PWM comparator;
• generate, based on the first PWM signal, N PWM signals by delaying the first PWM signal with different delay times, a kth PWM signal of the N PWM signals being the first PWM signal delayed with a delay time of (k−1)Δt, wherein Δt is a first delay time, k is an integer, and 1≤k≤N;
• and
• feed the N PWM signals to the N switching power converters, respectively, to regulate an output voltage of the multi-phase power conversion system.