Circuit arrangement for converting a voltage drop tapped from a

Details Circuit arrangement for converting a voltage drop tapped from a Circuit arrangement for converting a voltage drop tapped from a

1992-07-01

1994-09-13

Callahan, Timothy P.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

330288, 323315, 3072966, H03K 1730

Patent

active

053471741

ABSTRACT:
A circuit arrangement for converting a voltage drop (.DELTA.U) tapped from a test object from a predetermined input voltage range to a desired output voltage range includes a current mirror circuit fed by a constant current source (14) and comprising an input transistor (T1) and an output transistor (T2). The constant current source (14) lies in the collector line of the input transistor (T1) whilst in the collector line of the output transistor (T2) at least one diode (D1) lies which is traversed by a current having a value which is equal to the value of the current furnished by the constant current source (14). Lying in parallel with the series circuit of the output transistor (T2) and the diode (D1) is an identically configured circuit branch having a further transistor (T3) and at least one diode (D2) lying in the collector line thereof. The test object (16) lies in the emitter line of the further transistor (T3); the test object (16) is traversed by a test current from a further constant current source (20). Two output lines (22, 26) are provided with which the preceding voltage drop can be tapped from the collector of the output transistor (T2) and the collector of the further transistor (T3).

REFERENCES:
patent: 4088905 (1978-05-01), Comer
patent: 4401899 (1983-08-01), Okada
patent: 4513209 (1985-04-01), Tanabe et al.
patent: 4553048 (1985-11-01), Bynum et al.
patent: 4620114 (1986-10-01), Moon
patent: 4988895 (1991-01-01), Kihara et al.

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