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Current Sensing

Current Sensing. Mike Ambrisco. Background. All current sensing devices require being in series with the circuit. The easiest way to find current is by adding a .1 Ω resistor or smaller into the circuit and measuring the voltage across, and divide it by the resistance. Types of Sensors.

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Current Sensing

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  1. Current Sensing Mike Ambrisco

  2. Background • All current sensing devices require being in series with the circuit. • The easiest way to find current is by adding a .1Ω resistor or smaller into the circuit and measuring the voltage across, and divide it by the resistance.

  3. Types of Sensors • Shunt Resistor • Added known resistance into the circuit in series. • Uses a small, .1Ω or smaller resistor to minimize total voltage drop. • Measure the Voltage drop across the resistor. • Using ohms law [V=I*R] you can rearrange the formula to find I [I=V/R] • V= Voltage, I=Current, R=Resistance. • Op Amps • Uses the Shunt Resistor • Outputs a voltage • Can be calculated to show calculated current as output voltage. • Micro Processing • Uses the Shunt Resistor and Op Amps • Uses the most power • Can display output on LCD display • Easily customizable and easily modified

  4. Cost • A Shunt resistor is very inexpensive. • 5 to 20 cents. • A Op Amp is also inexpensive. • Up to $1. • A Micro Controller with LCD display. • $20 to $100.

  5. Basic Shunt Resistor Setup V1 – V2 Shunt = Current V1 V2

  6. Simple Op Amp Sensors www.analog-europe.com http://www.analog-europe.com/215801634%3Bjsessionid=WGUIE44PFGWTFQE1GHRSKH4ATMY32JVN?printableArticle=true

  7. Micro Processer Setup Micro Controller A2D Converter LCD Display

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