US Customs Ruling (CROSS)
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Ruling Number :
Issuing Country : UNITED STATES
Date Of Issue : 2002-08-13T00:00:00
Closed-Loop Linear Current Sensor
The merchandise under consideration is a closed-loop linear current sensor. A current sensor is an electronic device that detects or measures the amount of AC or DC current flowing through a wire and provides a digital or analog output. Sensors are used for ground fault detection, control feedback loops, motor overload protection and energy management. These closed-loop linear current sensors are made up of a magnetic core, a secondary coil winding around the core, an analog output Hall-effect integrated circuit (“IC”), an operational amplifier and supporting electronics inside a plastic housing. A wire carrying the primary current to be measured is placed through the core of the sensor. The current generates a magnetic flux field around the wire. The flux is concentrated around the Hall IC by the magnetic core. The Hall IC generates a voltage proportional to the
strength of the magnetic field. The operational amplifier creates a current that is passed through the secondary winding to produce a magnetic field with the opposite polarity to the field created by the primary current. Sensors work by the null balance principle that is always driving the magnetic flux in the core to zero. The current in the secondary winding wire is therefore a mirror image of the primary current, reduced by the number of wire turns in the secondary winding. Passing the secondary current through a precision measuring resistor gives a voltage drop proportional to the current in the primary circuit.
Description : Closed-Loop Linear Current Sensor
Please importantly note that only the relevant portion of the related US Ruling (Cross) is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
Source : US Customs Ruling (CROSS)
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