Patent ID: 8786268
Filing Date: 2014-07-22
Classification: H02M

Abstract:
1. A method for automatically compensating a voltage regulator, the regulator having a nominal output voltage, the method comprising: applying a DC bias voltage to a first node in a feedback loop in the regulator to cause the output voltage to be at a first value; applying an AC perturbation signal to the DC bias voltage to cause the output voltage to have a ripple at a frequency of the AC signal; detecting a gain of the feedback loop and a phase difference between the AC signal and the ripple in the output voltage; using the detected gain and phase difference to automatically adjust operating characteristics of one or more components in the regulator such that, when the one or more components are connected in the feedback loop, the feedback loop has a desired gain and phase margin at the frequency of the AC signal, wherein the one or more components are not connected in the feedback loop during the steps of applying the AC perturbation signal and detecting the gain of the feedback loop and the phase difference between the AC signal and the ripple in the output voltage; and operating the regulator with the one or more components in the feedback loop, wherein the feedback loop detects the output voltage of the regulator and regulates a duty cycle of one or more switches to maintain a regulated output voltage.