Patent ID: 7323855
Filing Date: 2008-01-29
Classification: H02M

Abstract:
1. A digital power supply for maintaining a regulated output voltage level, comprising: a power supply section for receiving control signals and converting an input DC voltage at a first level to an output regulated DC voltage; a voltage sense circuit for sensing the voltage level of said output regulated DC voltage; a digital controller for generating said control signals as a function of the difference between said sensed output regulated DC voltage and an analog reference voltage level; a differential analog-to-digital converter (ADC) for generating a digital value representing the difference between said analog reference voltage and said sensed output regulated DC voltage and variable and having a resolution defined by the size of a least significant (LSB) bit; said digital controller controlling said power supply section to vary the output voltage level of said power supply section to provide said output regulated DC voltage, said regulated DC voltage occurring when the sensed voltage from said sense circuit substantially equals said analog reference voltage; and an LSB controller for varying the size of the LSB of said differential ADC without varying the output of said differential ADC.