Sensing Elements for Current Measurements

 First, we’ll focus on evaluating current measurements using a shunt (sense) resistor. We’ll explain how to choose a sense resistor and discuss the inaccuracies associated with the sensing element and extraneous parameters that compromise the overall measurement.  Then, we’ll evaluate a direct current resistance (DCR) sensing architecture that allows for lossless current sense in some power applications. We’ll explain how to design a DCR circuit for power applications, analyze the drawbacks of the architecture and provide a way to improve the current measurement technique through calibration.  Finally, we’ll cover measuring current by way of a Hall Effect sensor, explain how a Hall Effect sensor works and discuss the drawbacks of the technology and recent improvements in the technology.