AC current detection device
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United States of America Patent
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Jan 6, 2004
Grant Date -
N/A
app pub date -
Jan 11, 2002
filing date -
Jul 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An alternating current detector includes a current transformer having a primary winding through which a current to be detected flows, and a secondary winding and an auxiliary winding, magnetically coupled to the primary winding via a core, of which one ends are connected to each other and thus form a common terminal, and an operational amplifier for amplifying a voltage induced in the auxiliary winding, and applying the voltage to the secondary winding with the current assuming such a polarity as to restrain a change in magnetic flux of the core, whereby a voltage corresponding to the current to be detected is induced in the secondary winding. A waveform of a large current having a low frequency can be thereby observed highly precisely with an output of the detected voltage having a large amplitude.
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