Patent ID: 9444339
Filing Date: 2016-09-13
CPC Classification: H02M

Claim Text:
1. A DC-DC converter, adapted to control a converting circuit to convert an input voltage into an output voltage, wherein the converting circuit comprises a switch module coupled to the input voltage and an LC filter coupled the switch module to generate the output voltage, the DC-DC converter comprising: a system control circuit for generating a switch control signal according to a reference voltage and a state of the LC filter; a driver circuit for controlling the switch module according to the switch control signal to adjust the output voltage in response to the reference voltage; and an output voltage adjusting circuit, coupled to the LC filter, the output voltage adjusting circuit being configured for determining whether to adjust the output voltage according to a adjusting reference voltage and a detecting voltage indicative of the output voltage, and if yes, the output voltage adjusting circuit adjusts the output voltage toward a predetermined adjusting voltage; wherein the output voltage adjusting circuit stops adjusting a stored power in the LC filter when the output voltage adjusting circuit adjusts the stored power in the LC filter for a predetermined adjusting time period; wherein the output voltage adjusting circuit adjusts the output voltage toward the predetermined adjusting voltage by utilizing a nonlinear current, and the nonlinear current is provided by a current of a buffering circuit or a sum of a current of a differential pair and a current of a current mirror.