Patent ID: 8856562
Filing Date: 2014-10-07
Classification: G05F,H02M

Abstract:
1. A method of operating a cascaded voltage regulator, comprising: providing a first stage of the cascaded voltage regulator including a buck converter; receiving an input voltage at an input of the buck converter; providing an intermediate voltage at an output of the buck converter; providing a second stage of the cascaded voltage regulator including a first switched capacitor voltage regulator having a first conversion ratio constant and a second switched capacitor voltage regulator having a second conversion ratio constant; receiving the intermediate voltage at an input of the second stage of the cascaded voltage regulator; providing an output voltage from a filter coupled to the first and second switched capacitor voltage regulators to a load; providing a controller; receiving at the controller, information related to a desired output voltage for the second stage of the cascaded voltage regulator; determining a desired intermediate voltage and first and second conversion ratio constants for the second stage of the cascaded voltage regulator based on the desired output voltage; and adjusting the intermediate voltage and first and second conversion ratio constants based on control information received from the controller.