US Customs Ruling (CROSS)
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Issuing Country : UNITED STATES
Date Of Issue : 2002-08-13T00:00:00
Open-Loop Current Sensor
The articles under consideration are two types of open-loop current sensors, identified by catalogue #CSDA1AC and #CSLA1CE. 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 open-loop current sensors are made up of a magnetic core, an output Hall-Effect integrated circuit (“IC”), an operational amplifier and supporting electronics inside a plastic housing.
A wire carrying the 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 current sensor detects and measures the relationship between the output state of the current sensor and the level of current detected in the wire. This data is then relayed to the device requiring the output through the device’s printed circuit board (“PCB”). The first type of open-loop current sensor, #CSDA1AC, is a “series-connect digital current sensor.” It features a digital logic level output that changes when the sensed current exceeds a pre-determined operating point. Strategically placed leads protruding from the plastic housing are used to interface with the PCB of the device using the data supplied by the current sensor. The second type of open-loop sensor, #CSLA1CE, is a linear current sensor. This sensor uses the same base elements as the digital current sensor; however, the output is linear instead of digital. As with the digital sensor, the linear sensor is designed to be mounted on a PCB.
Description : Open-Loop Current Sensor
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Source : US Customs Ruling (CROSS)
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