Control circuit for multi-phase power conversion circuit and multi-phase power supply

A control circuit for a multi-phase power conversion circuit, the multi-phase power conversion circuit comprising a plurality of switching circuits which have output terminals being coupled together to supply power to a load, the control circuit comprising:

• an error amplifier configured to compare a feedback signal of an output voltage with a reference voltage signal and generate an error amplification signal;
• a pulse width modulation circuit configured to generate an on time signal according to the error amplification signal, and
• a multi-phase logic control circuit configured to generate a plurality of PWM signals according to the on time signal, which are delayed phase by phase and control on and off states of the plurality of switching circuits, and each of which has a pulse width being consistent with the on time signal,
• wherein the multi-phase logic control circuit comprises:
• a plurality of width-preserving delay units corresponding to the plurality of switching circuits, each width-preserving delay unit being configured to delay an input signal for a predetermined time period to generate a PWM signal for corresponding one of the plurality of switching circuit,
• each of the plurality of width-preserving delay units comprises:
• a rising-edge delay means configured to delay a rising edge of the input signal by the predetermined time period to generate a first signal;
• a falling-edge delay means configured to delay a falling edge of the input signal by the predetermined time period to generate a second signal, and
• a signal combination means configured to combine the first signal and the second signal to obtain an output signal of the width-preserving delay unit.