Method to recover from current loop instability after cycle by cycle current limit intervention in peak current mode control
AssigneeSTMicroelectronics S.r.l.
InventorsAndrea Villot, Enrico Papa, Silvio Pepino
Life of this patent
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Abstract
A method detects current-limit events indicating a maximum current threshold of a switching converter has been reached, A compensation voltage is adjusted in response to the detected current-limit events, where the compensation voltage defines a duty cycle of the switching converter. A time for which no current-limit events have been detected is sensed, and the value of the compensation voltage adjusted in response to the detected time reaching a time step threshold.
Claims20
A control circuit configured to control switching circuitry of a switching converter and to detect current-limit events indicating a maximum current threshold of an inductive element of the switching circuitry has been reached, the control circuit configured to adjust a value of a compensation voltage in response to the detected current-limit events, wherein the compensation voltage defines a duty cycle of the switching converter and the control circuit further is configured to detect a time for which no current-limit events have been detected and to adjust the value of the compensation voltage to increase the duty cycle of the switching converter in response to the detected time reaching a time step threshold.
A switching voltage regulator, comprising:
- switching circuitry including an input node configured to receive an input voltage and including a switching element coupled to an inductive element, the switching circuitry configured to control switching of the switching element responsive to a drive signal to generate an output voltage on an output node;
- and
- a control circuit configured to detect current-limit events indicating a current through the inductive element has reached a maximum inductor current threshold, and configured to generate the drive signal based on a compensation voltage to control a duty cycle of the switching voltage regulator and an inductor current supplied on the output node to eliminate the occurrence of current-limit events, the current control circuit further configured to detect whether a time for which no current-limit events have been detected reaches a time step threshold and to control the compensation voltage to increase the duty cycle responsive to the time reaching the time step threshold.
A method, comprising:
- detecting current-limit events indicating a maximum current threshold of a switching converter has been reached;
- adjusting a value of a compensation voltage in response to the detected current-limit events, the compensation voltage defining a duty cycle of the switching converter;
- detecting a time for which no current-limit events have been detected;
- and
- adjusting the value of the compensation voltage in response to the detected time reaching a time step threshold.
Dependencies are inferred from the claim text.