Direct current measuring apparatus and limiting circuit

Details Direct current measuring apparatus and limiting circuit Direct current measuring apparatus and limiting circuit

2007-11-14

2008-11-04

Karlsen, Ernest F. (Department: 2829)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

Reexamination Certificate

active

07446554

ABSTRACT:
A direct current measuring apparatus includes a voltage generating part generating a voltage to be applied to a load being a measuring object; a current limiting part limiting a current flowing in the load to a set value; and an output terminal connected to the load. The current limiting part includes a D/A converter, a positive side limiting circuit, a D/A converter and a negative side limiting circuit. The positive side limiting circuit includes a negative feedback loop. The negative feedback loop includes a capacitor and a buffer circuit besides the feedback resistance. An output of the positive side limiting circuit positive side limiting circuit is connected to a non-inverting input terminal of the main amplifier through a diode.

REFERENCES:
patent: 7068061 (2006-06-01), Tanida et al.
patent: 7154291 (2006-12-01), Turner
patent: 3-183967 (1991-08-01), None

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