Self-tuning sensorless digital current-mode controller with accurate current sharing for multiphase dc-dc converters
AssigneeExar Corporation
InventorsZdravko Lukic, S M. Ahsanuzzaman, Aleksandar Prodic
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Abstract
Embodiments of the present invention concern a multiphase switch-mode power supply. The multiple phase switch-mode power supply can have at least one switch and a digital controller to control the switching of the at least one switch. During a calibration period, the digital controller can freeze the current of all of the multiple phases except for a phase being calibrated. This can be done by fixing the current reference of the phases except for the phase being calibrated.
Claims26
A multiphase switch-mode power supply comprising:
- multiple phases having at least one switch;
- and
- a digital controller to control the switching of the at least one switch of the multiple phases;
- wherein during a calibration period, the digital controller freezes the current of all of the multiple phases except for a phase being calibrated.
A multiphase current estimator comprising:
- a digital filter to produce a current estimate from a voltage based input value;
- a current sink to produce an increase in the current;
- and
- calibration logic to update coefficients for the digital filter based on the current increase produced by the current sink;
- wherein current estimation is done for one of multiple phases;
- and
- wherein the remaining phases are frozen, while the one of the multiple phases is calibrated.
A switched mode power supply comprising:
- multiple phases with at least one switch and a power inductor;
- and
- a digital controller to control the switching of the at least one switch of the switched mode power supply;
- wherein the current through the power inductor are estimated using a self-tuning multiphase digital current estimator;
- and wherein the self tuning uses a current sink;
- and
- wherein there are multiple phases and during the calibration of one of the phases the current of the other phases are frozen.
Dependencies are inferred from the claim text.