Power limiting circuit
AssigneeR. Stahl Schaltgeräte GmbH
InventorsFritz Frey, Jorg Stritzelberger
Life of this patent
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Abstract
A circuit arrangement includes a current measuring or temperature measuring device, used for triggering a shunt device. Said shunt device produces a short-circuit, which directly leads to the blowing of a fuse. The arrangement is modular and allows the operation of several current measuring devices on a common shunt device. Said arrangement is specifically adapted to prevent a protection resistor from warming up to too high a surface temperature in the case of an error, because the current is flowing for too much time.
Claims26
Circuit arrangement for current limiting in a supply line to a current load (31), with a first series branch (2, 3), which galvanically connects a first input point (4, 6) to a first output point (5, 7), with a second series branch (2, 3), which galvanically connects a second input point (4, 6) to a second output point (5, 7), with a current limiting resistor (8) in at least one of the series branches (2, 3), with a current measurement device (9), which detects the current in at least one of the series branches (2, 3) and which has at least one signal output (15), with a shunt device (10), which is attached to the side of the current limiting resistor (8) adjacent to the input point (4, 6) and which has a control input (25), which is attached to the signal output (15) of the current measurement device (9), and with a non-linear element (11), which lies between one of the input points (4, 6) and the shunt device (10) and which has low resistance below a current limiting value and becomes high resistance when the current limiting value is exceeded.
Dependencies are inferred from the claim text.