Patent ID: 8089254

Claim:
A method of controlling a DC-DC converter to provide a desired output voltage from an input voltage which is different than the desired output voltage comprising: providing a switching frequency having a period to the DC-DC converter; operating the DC-DC converter in a first converting mode for each period the input voltage is greater than a first predetermined voltage level, wherein the first converting mode comprises a repeating of a first duty cycle pulse; operating the DC-DC converter in a second converting mode for each period the input voltage is less than a second predetermined voltage level, wherein the second voltage is less than the first voltage, wherein the second converting mode comprises a repeating of a second duty cycle pulse; operating the DC-DC converter in a third converting mode when the input voltage is less than the first predetermined voltage level and greater than the second predetermined voltage level, wherein the third converting mode comprises a plurality of sequential combination configurations of the first duty cycle pulse and the second duty cycle pulse, wherein each subsequent combination configuration of the first duty cycle pulse and the second duty cycle pulse comprises a lesser amount of the first duty cycle pulse and an increased amount of the second duty cycle pulse.