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universal current sensor full report - shoeb - 10-04-2017 [attachment=2400] UNIVERSAL CURRENT SENSORS INTRODUCTION MEASUREMENT OF ELECTRIC CURRENT STRENGHT IS DIFFICULT FOR ELECTRONIC CONDITIONING CONNECTING AMMETER AND READING OUT VALUES ARE NOT VALID GALVANIC ISOLATION AND BAND WIDTH PHYSICALLY LARGE AND TECHNICALLY COMPLEX SENSORS IMPORTANCE OF SENSORS * CURRENT IS FED TO COMPUTERS IN WHICH SENSORS CONVERT IT TO PREPOTIONAL VOLTAGE * MINIMUM INFLUENCE ON MEASURED CIRCUT EARLIER SOLUTIONS 1. TO MEASURE VOLTAGE DROP ACROSS RESISTOR PLACED IN CURRENT PATH USE A TRANSFORMER HALL CURRENT SENSORS CONSTRUCTION AND TYPE OF HALL SENSORS CONSTRUCTION CIRCULAR CORE OF SOFT MAGNETIC MATERIAL HALL ELEMENT TO PRODUCE PREPOTIONATE VOLTAGE AMPLIFIER TYPES OPEN LOOP AND CLOSED LOOP COMPARISON OF OPEN LOOP AND CLOSED LOOP SENSORS OPEN LOOP AMPLIFIED OUTPUT OF HALL ELEMENT IS DIRECTLY USED AS MEASURED VALUE PRICE AND SENSITIVITY IS LOW CLOSED LOOP A COMPENSATION COIL IS WOUND AROUND MAGNETIC CORE NON LINEARITY AND TEMPERATURE DEPENDANCE ARE REDUCED NOT CHEAP AND BULKY FOR HIGH CURRENTS MAGNETO RESISTIVE EFFECT SLIGHT CHANGES IN RESISTANCE WHEN FERRO MAGNETIC MATERIALS ARE PLACED IN MAGNETIC FIELD A PREFFERD ORIENTATION OF MAGNETISATION WHEN EXPOSED TO MAGNETIC FIELD MAGNETIC MOMENT ALONG LINEAR AXIS COULD BE CHANGED BY APPLYING MAGNETIC FIELD WHICH RESULT IN INCREASE IN CURRENT ADVANTAGES OF MAGNETO RESISTORS CONFIGURED AS WHEATSTONE BRIDGE USED AT HIGH FREQUANCY USED AT HIGH TEMPERATURE HIGH SENSITIVITY CONSTRUCTION CONFIGURED AS FULL BRIDGE WITH BABER POLES PLACED IN OPPOSITE DIRECTION TO IMPROVE TEMPERATURE DEPENDANCE ELECTRICALLY ISOLATED ALUMINIUM COMPENSATION CONDUCTORS ARE USED ON SAME SUBSTRATE ABOVE PERMALLOY RESISTORS TO IMPROVE LINEARITY VOLTAGE DROP ACROSS RESISTOR FORMS ELECTRICAL OUTPUT SIGNAL PRIMARY CONDUCTORIS U SHAPED FEATURES 1. NO MAGNETIC SHIELDING NEEDED 2. LINEARITY ERROR<.1% OFFSET VOLTAGE<10MV 3.POWERED BY STANDARD BIPOLAR VOLTAGE OF +OR- 15 4. POWER CONSUMPTION IS 320MWTO 640MW 5.NO REMANENENCE OUTPUT CAN BE SCALED FOR A/D CONVERTERS COMPARATOR TO MEASURE SHORTCIRCUIT CURRENT NO REMANENCE DUE TO ABSENSE OF CORE COMPESATION PRODUCE HIGH LINEARITY ADVANTAGES SMALLER VOLUME AND WEIGHT COMPARED TO CONVENTIONAL CURRENT SENSOR NO REMANENCE IN THE EVENT OF OVERLOAD MEASUREMENT OF DC AND AC CURRENT WITH OUT ADDITIONAL LOSSES WIDE FREQUANCY RANGE LOW SYSTEM COST APPLICATION INVERTERS AND SERVO REGULATORS ENERGY DISTRIBUTION POWER ELECTRONICS SYSTEM BATTERY MANAGEMENT UNINTERRUPTABLE POWER SUPPLIES ROBOTICS AUTOMOTIVE RECENT DEVELOPMENTS SENSOR MODULE IS REALISED AS DIL CHIP MOUNTED ON POWER PCB BOARD BUS BAR IS ALIGNED AS BUS BAR PLATE LATEST MR SENSORS PRIMARY CONDUCTOR IS USUALLY FLAT SENSOR MODULE IS CLIPPED INTO A SLOT MADE IN IT SENSORS ARE MOUNTED ON SUBSTRATE AND ENCAPSULATED IN PLASTIC THEY ARE SMALL COMPACT LIGHT CHEAP AND EASY TO MOUNT PRIMARY CONDUCTOR IS PART OF APPLICATION CURRENT SENSORS IN TOMMORROWS CARS MANY COMPONENTS OPERATED BY CARS ENGINE WILL IN FUTURE OPERATE ON ELECTRICITY ACCORDING TO NEW PROTOTYPE PRESENT AT MANNESMANN-SACHS AG AT 1999 IAA CAR EXHIBITION IN GERMANY A STARTER GENERATOR I S USED IT REQUIRE THREE PHASE MOSFET ALTERNATOR 2 PHASES REQUIRE MAGNETO RESISTANCE CURRENT SENSORS CONCLUSION MAGNETO RESISTIVE SENSORS ARE A GROUP OF SENSORS WHICH HAVE BOUGHT FAST AND REVOLUTIONARY CHANGES IN CURRENT MEASUREMENT AND ITS CONDITIONING . ATTEMPTS ARE GOING ON TO MAKE IT MORE USER FRIENDLY IN THE NEXT FEW DECADES MAGNETO RESISTORS AND ITS SENSORS ARE PREDICTED TO REPLACE THE CONVENTIONAL RESISTORS IN ALL APPLICATION universal current sensor full report - kiran1324 - 10-04-2017 [attachment=3164] The measurement of electric current strength is not always easy, especially when the measured signal requires further electronic conditioning. Simply connecting an ammeter to an electrical circuit and reading out the value is no longer enough. The current signal must be fed into a computer in which sensors convert current into a proportional voltage with minimal influence on the measured circuit. The basic sensor requirements are galvanic isolation and a high bandwidth, usually from DC up to at least 100 kHz. Conventional current measurement systems therefore tend to be physically large and technically complex. Early Solutions The oldest technique is to measure the voltage drop across a resistor placed in the current path. To minimize energy losses the resistor is kept very small, so the measured voltage must be highly amplified. The amplifier s offset voltage must be as small as possible and its supply voltage must be at the potential of the circuit, often 110 V mains (230 V in Europe) with high parasitic peaks from which its output must be isolated. This requirement increases overall system cost. Another widespread principle is the transformer. Its construction is much simpler, but it doesn t allow the measurement of DC signals. Isolation between primary and secondary sides is implicitly given. A problem is the limited frequency range. Hall Current Sensors Hall sensors also measure the magnetic field surrounding the conductor but, unlike current transformers, they also sense DC currents. A circular core of soft magnetic material is placed around the conductor to concentrate the field. The Hall element, which is placed in a small air gap, delivers a voltage that is proportional to the measured current. This sensor also offers a galvanic isolation. The very small output voltage of the Hall element must be highly amplified, and the sensitivity is temperature dependent and requires adequate compensation. There is an inevitable offset, i.e., a small DC voltage at zero current; the offset amplitude and temperature coefficient are subject to significant fluctuations. The smaller the current to be measured, the higher the offset-induced relative error. Also of note is sensitivity to short current peaks in the circuit: according to the hysteresis properties of the core material, these peaks can cause a static magnetization in the core that results in a permanent remanence, and finally to an offset alteration of the Hall element universal current sensor full report - sumeshrktvm - 10-04-2017 to get information about the topic "current sensor " full report ppt and related topic refer the page link bellow http://seminarsprojects.net/Thread-universal-current-sensor-full-report http://seminarsprojects.net/Thread-magneto-optical-current-transformer-moct http://seminarsprojects.net/Thread-universal-current-sensor-full-report--45818?pid=94351#pid94351 universal current sensor full report - [email protected] - 10-04-2017 to get information about the topic universal current sensor full report, ppt and related topic refer the page link bellow http://seminarsprojects.net/Thread-universal-current-sensor-full-report universal current sensor full report - harishpanchal_18 - 10-04-2017 to get information about the topic "universal current sensor " full report ppt and related topic refer the page link bellow http://seminarsprojects.net/Thread-universal-current-sensor-full-report universal current sensor full report - arunchandrabose - 10-04-2017 to get information about the topic"UNIVERSAL CURRENT SENSOR" full report ppt and related topic refer the page link bellow http://seminarsprojects.net/Thread-universal-current-sensor-full-report universal current sensor full report - vijitha - 10-04-2017 Hey, I am dng a seminar on "The Universal Current Sensor". 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