As switching frequencies continue to rise with the adoption of GaN and SiC, power engineers are eyeing alternatives to the shunt resistor for current sensing.
Challenges often arise with the relatively common low-ohmic-value resistors during the design and manufacturing phases, leading to an array of misconceptions about them. This article sets about to debunk those myths.
Based on a Fluke Calibration paper1Current often is derived from the voltage drop measured across a shunt of known value. However, as the paper states, “It is common practice for current shunts to be calibrated at a single current level and then used over a wide range of currents. The power coefficient (PC) of the shunt can contribute significant error...
