Direct current measuring apparatus and limiting circuit
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United States of America Patent
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Nov 4, 2008
Grant Date -
May 15, 2008
app pub date -
Nov 14, 2007
filing date -
Nov 15, 2006
priority date (Note) -
Expired
status (Latency Note)
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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.
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