Multi-phase interleaved power converters with improved current balancing

A multi-phase interleaved power factor correction (PFC) converter, comprising:

• at least six switches coupled in a multi-phase interleaved circuit arrangement;
• and
• a control circuit coupled to the at least six switches, the control circuit configured to:
• during a first polarity of an AC input voltage, turn on and turn off a first one of the at least six switches according to a pulse-width modulation (PWM) signal to operate the first switch as a power factor correction (PFC) active switch having an off-time as a function of a duty cycle of the PWM signal, while turning on and turning off a second one of the at least six switches as a synchronous switch;
• receive one or more signals indicative of the currents in each phase of the interleaved circuit arrangement;
• in response to the one or more signals indicating that the converter is operating in a continuous mode, set an on-time of the second switch equal to the off-time of the first switch;
• and
• in response to the one or more signals indicating that the converter is operating in a discontinuous mode, set the on-time of the second switch to a duration less than the off-time of the first switch.