Patent ID: 6329727
Filing Date: 2001-12-11
Classification: H02M

Abstract:
An apparatus for regulating the power delivered to an electrical device, the apparatus comprising:a microcontroller for outputting a digital signal in response to input data;a variable power supply for generating an output voltage from an input voltage in accordance with a control signal received at a control port;a resistor divider having an upper portion electrically coupled to the output voltage, a lower portion electrically coupled to a reference ground, and a center node coupled to the upper and lower portions and to the control port of the variable power supply; anda feedback adjustment module having a plurality of resistive elements and a corresponding plurality of coupling elements, each coupling element for electrically connecting a corresponding one of the resistive elements in parallel with a predefined one of the upper and lower portions of the resister divider when operation of the coupling element is enabled, a subset of the plurality of coupling elements being enabled in accordance with the digital signal output by the microcontroller, such that the effective resistance of the predefined portion of the resistor divider is modified by the subset of the resistive elements that are coupled in parallel therewith in accordance with the digital signal.