Digitally controlled current-mode switched power supply
AssigneeAgere Systems Inc.
InventorsLuis De La Torre, Fadi Saibi
Life of this patent
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Abstract
Disclosed is a current mode switched power supply. The current mode switched power supply includes a switching element and a power stage coupled to the switching element and configured to provide, in response to the switching of the switching element, an output voltage and a feedback voltage related to the output voltage. The current mode switched power supply also includes a digital control circuit connected to the switching element to digitally control the switching of the switching element.
Claims21
A current mode switched power supply comprising:
- a switching element;
- a power stage coupled to said switching element and configured to generate, in response to the switching of said switching element, an output voltage and a feedback voltage related to said output voltage;
- and
- a digital control circuit comprising
- a difference circuit configured to produce an error voltage from said feedback voltage;
- a converter configured to convert said error voltage to a peak current threshold value;
- and
- a comparator configured to compare said peak current threshold value to a voltage representing current through a resistor coupled to said switching element, wherein said digital control circuit further comprises a digital loop filter configured to receive programmable filter parameter values and said error voltage.
A method for controlling a current mode switched power supply comprising:
- switching a switching element coupled to said current mode switched power supply;
- said current mode switched power supply generating an output voltage and a feedback voltage related to said output voltage in response to said switching;
- generating an error voltage from said feedback voltage;
- converting said error voltage to a peak current threshold value;
- and
- comparing said peak current threshold value to a voltage representing current through a resistor coupled to said switching element, wherein said generating an error voltage further comprises calculating a difference between a programmable reference voltage and said feedback voltage.
A current mode switched power supply comprising:
- means for switching a switching element coupled to said current mode switched power supply;
- means for generating an output voltage and a feedback voltage related to said output voltage in response to said switching;
- means for generating an error voltage from said feedback voltage;
- means for converting said error voltage to a peak current threshold value;
- means for comparing said peak current threshold value to a voltage representing current through a resistor coupled to said switching element;
- and
- means for calculating a difference between said feedback voltage and a programmable reference voltage.
A method for controlling a current mode switched power supply comprising:
- switching a switching element coupled to said current mode switched power supply;
- said current mode switched power supply generating an output voltage and a feedback voltage related to said output voltage in response to said switching;
- generating an error voltage from said feedback voltage;
- converting said error voltage to a peak current threshold value;
- comparing said peak current threshold value to a voltage representing current through a resistor coupled to said switching element;
- and
- performing digital filtering of said error voltage using filter parameters to produce peak current digital representation.
A current mode switched power supply comprising:
- means for switching a switching element coupled to said current mode switched power supply;
- means for generating an output voltage and a feedback voltage related to said output voltage in response to said switching;
- means for generating an error voltage from said feedback voltage;
- means for converting said error voltage to a peak current threshold value;
- means for comparing said peak current threshold value to a voltage representing current through a resistor coupled to said switching element;
- and
- means for filtering said error voltage using filter parameters.
Dependencies are inferred from the claim text.