Method for recognition and/or limiting the short-circuit state of a switching converter and switching converter
AssigneeSiemens AG Osterreich
InventorsAndreas Kranister, Harald Schweigert
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Abstract
The invention pertains to a method for detecting and/or limiting short-circuit or overcurrent states of a switching regulator, where the load current or a variable proportional to the load current is measured and compared with a predetermined maximum value, and where the result of this comparison is used to influence the switching pulses. In this case, the result of the comparison between the load current and the maximum value is only taken into consideration within at least one time window during at least one timing period of the switching pulses.
Claims10
Method for detecting and/or limiting short-circuit or overcurrent states of a switching regulator, wherein the load current or a variable proportional to the load current is measured and compared with a predetermined maximum value, and wherein the result of this comparison is used for influencing the switching pulses, characterized by the fact that the result of the comparison between the load current and the maximum value is only taken into consideration within at least one time window during at least one timing period of the switching pulses.
Switching regulator for converting a d.c. input voltage (UE) into an output voltage (UA), wherein the input voltage can be connected to an inductor (Tr) by means of at least one switch (S) that is controlled by the switching pulses of a trigger circuit (AST), and wherein the switching regulator is designed to influence the switching pulses in the sense of a load current supply when a predetermined maximum value of the load current is exceeded, characterized by the fact that at least a first timing element (MF1) is provided in order to evaluate the load current only within at least one time window (t1) during at least one timing period of the switching pulses, in order to define this time window.
Dependencies are inferred from the claim text.