Upi Semiconductor Corporation

Han-Pang Wang

Chih-Lien Chang

Hua-Chiang Huang

A multi-phase DC-DC power converter including a pulse width modulation (PWM) controller and a plurality of output stage circuits is provided. The output stage circuits convert an input voltage into an output voltage. The PWM controller includes a PWM generation module, a ramp generator and a feedback circuit. The feedback circuit generates a trigger signal according to the output voltage and a ramp signal. The PWM generation module generates a PWM signal with a constant on time, and adjusts a duty cycle of the PWM signal according to the trigger signal, the input and output voltages, so as to control phase channels of the multi-phase DC-DC power converter in order.

Multi-phase DC-DC power converter

A current balancer suitable for a multi-phase power converting device is provided. The current balancer includes an error detection unit and a plurality of pulse control units. Each of the pulse control units includes a current-to-voltage converter, a charging and discharging controller, a capacitor, and a comparator. The error detection unit detects a plurality of channel currents generated by the multi-phase power converting device, and generates a plurality of error currents by calculating. The charging and discharging controller provides a charging voltage or a discharging voltage according to a constant pulse-width modulation (PWM) signal. When the channel currents are balanced, the comparator generates a PWM signal with a constant duty cycle. When the channel currents are not balanced, an error voltage generated by the current-to-voltage converter is used to adjust a voltage level of the charging voltage or the discharging voltage, so that the PWM signal is varied correspondingly.

Growing community of inventors

Tainan County, Taiwan

Han-Pang Wang