Power conversion circuit of multi-phase power supply and multi-phase power supply and control method therefor

A power conversion circuit of a multi-phase power supply, wherein the multi-phase power supply comprises N-phases of power conversion circuits, where N is a positive integer greater than 1, wherein the power conversion circuit comprises:

• a PWM signal generating circuit which receives a counting code and generates a pulse width modulation signal when the counting code meets a predetermined condition;
• a driving circuit which converts the pulse width modulation signal into a switch driving signal;
• and
• a power circuit which includes at least one switching transistor with on and off states being controlled by the switch driving signal to provide an output voltage of respective one of the N-phases in accordance with an input voltage,
• wherein the predetermined condition is met when a count value represented by the counting code is equal to an identification number of the power conversion circuit,
• wherein the counting code comprises a first counting code and a second counting code,
• the PWM signal generating circuit is configured to generate an on signal when the first counting code meets the predetermined condition, which the on signal is used for determining an on time of the at least one switching transistor, and to generate an off signal when the second counting code meets the predetermined condition, which the off signal is used for determining an off time of the at least one switching transistor, and the pulse width modulation signal is obtained according to the on signal and the off signal.