Overcurrent sense circuit

Details Overcurrent sense circuit Overcurrent sense circuit

1995-03-09

1996-09-24

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

324126, 324522, 361 98, 323315, G08B 2100

Patent

active

055595006

ABSTRACT:
An overcurrent is detected with small power consumption and at a high level of accuracy. A first transistor section 3 comprised of one NPN transistor 31 and a second transistor section 4 comprised of four NPN transistors 41-44 having the same characteristics as those of the transistor 31 are connected across a current sense resistor 2, with their emitters connected to the resistor 2. The transistors 31 and 41-44 have their bases commonly connected, with a voltage applied between their base and emitter by a voltage application unit 5, and have their collectors connected to transistors 61 and 62 which form a current mirror circuit. Once a bandgap voltage, .DELTA.V.sub.BE, i.e., a voltage difference between the base-emitter voltages of the transistor sections 3 and 4, is determined, the current density ratio of both the transistor sections 3 and 4 is determined, which is used to detect an overcurrent.

REFERENCES:
patent: 3663863 (1972-05-01), Arimura et al.
patent: 3831160 (1974-08-01), Cronin et al.
patent: 3886932 (1975-06-01), Suessmith
patent: 4223365 (1980-09-01), Moran
patent: 4951171 (1990-08-01), Tran et al.
patent: 5089926 (1992-02-01), Kugelman

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