Current-limiting circuit with additional current path

Details Current-limiting circuit with additional current path Current-limiting circuit with additional current path

2011-04-12

2011-04-12

Salce, Patrick (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S058000, C323S277000

Reexamination Certificate

active

07924543

ABSTRACT:
A current-limiting circuit (100), which limits an electrical current from a voltage source to a consumer to a predetermined maximum current. A measuring resistor (110) is coupled into a current lead (103) between a circuit input (102) and a circuit output (104). A transistor (106) of the circuit is coupled into the current lead (103) with its collector-emitter path in series with the measuring resistor (110), and its base is connected to the current lead (103) through a series resistor (108). A shunt regulator (116) of the circuit has an anode, a reference input and a cathode, wherein the cathode is connected to the base of the transistor (106), and the anode and the reference input form a voltage tap across the measuring resistor (110). An additional, high-ohmic current path extends in parallel to the transistor (106) and includes a component connected reverse-biased having a diode characteristic and an auxiliary measuring resistor (120b), wherein the auxiliary measuring resistor (120b) is integrated in the voltage tap.

REFERENCES:
patent: 3303388 (1967-02-01), Means
patent: 3643151 (1972-02-01), Matsushima et al.
patent: 4161760 (1979-07-01), Valentine
patent: 4530023 (1985-07-01), Brown
patent: 4845584 (1989-07-01), Numata
patent: 5550700 (1996-08-01), Moore et al.
patent: 2004/0080892 (2004-04-01), Popescu-Stanesti et al.
patent: 38 14 251 (1989-06-01), None
patent: 0017981 (2000-03-01), None

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