Patent ID: 8816657
Filing Date: 2014-08-26
Classification: H02M

Abstract:
1. A multi-phase direct current (DC)-DC power converter, comprising: a plurality of output stage circuits receiving an input voltage and providing an output voltage; a ramp generator generating a ramp signal, wherein the ramp signal has fixed rising and falling slopes; a feedback circuit coupled to the ramp generator and output terminals of the output stage circuits, the feedback circuit generating a trigger signal according to the output voltage and the ramp signal; a pulse width modulation (PWM) generator coupled to the feedback circuit and generating a PWM signal according to the trigger signal, the input voltage and the output voltage; a phase channel current sensor coupled to the PWM generator and sensing output currents of the output stage circuits to calculate output current differences of the output stage circuits, so as to output a plurality of error current signals to the PWM generator, wherein the PWM generator adjusts a duty cycle of the PWM signal according to the error current signals; and a phase channel selector respectively coupled to the PWM generator, the ramp generator, the phase channel current sensor and the output stage circuits, the phase channel selector controlling operations of the output stage circuits and respectively outputting a plurality of PWM selection signals to the ramp generator and the phase channel current sensor according to the PWM signal generated by the PWM generator.