Switched-Mode Power Converter with a Current Limit Circuit

摘要

A switched-mode power converter with current limit circuits for limiting the input current into the power converter and/or the output current is presented. The power converter contains a feedback loop for controlling the output voltage of the converter. A first voltage comparison unit within the feedback loop compares an output voltage with a reference voltage and outputs an error voltage based on the comparison. The power converter also contains a current control unit for limiting the input/output current. The current control unit contains a current comparison unit and a connection unit. The current comparison unit compares the input/output current with a current threshold and outputs an intermediate voltage based on the comparison. The connection unit connects the output of the current comparison unit and the output of the current comparison unit to the output of the first voltage comparison unit if the input/output current exceeds the current threshold.

主权项

1) A switched-mode power converter comprising
a feedback loop for controlling the output voltage of the switched-mode power converter; a first voltage comparison unit within the feedback loop configured to compare a voltage indicative of the output voltage with a reference voltage and to output an error voltage based on the comparison; a current control unit for limiting an input current into the switched-mode power converter, the current control unit comprising
a current comparison unit configured to compare the input current with a current threshold and to output an intermediate voltage based on the comparison, anda connection unit connected to the output of the current comparison unit and configured to connect, in case the input current exceeds the current threshold, the output of the current comparison unit to the output of the first voltage comparison unit; wherein the current control unit is configured to set the intermediate voltage such that an over-shoot of the input current is reduced.