Patent ID: 8350545

Claim:
A current balancer, suitable for a multi-phase power converting device, wherein the multi-phase power converting device comprises N switching converter units, and N is an integer greater than or equal to 2, the current balancer comprising: an error detection unit, for detecting N channel currents generated by the switching converter units, and generating N error currents by calculating the channel currents; and N pulse control units, for generating N pulse-width modulation (PWM) signals according to a constant PWM signal and the error currents, so as to control the switching converter units, wherein i is an integer, and 1≦i≦N, and an i-th pulse control unit comprises: a charging and discharging controller, for providing a charging voltage or a discharging voltage according to the constant PWM signal; a current-to-voltage converter, for generating an error voltage according to an i-th error current, and transmitting the error voltage to the charging and discharging controller so as to adjust a voltage level of the charging voltage or the discharging voltage; a capacitor, having a first end electrically connected to a ground, and a second end electrically connected to the charging and discharging controller, so as to be charged or discharged according to the charging voltage or the discharging voltage; and a comparator, having a positive input terminal receiving a reference voltage, a negative input terminal electrically connected to the second end of the capacitor, and an output terminal generating an i-th PWM signal.