Transformer-Based DC Current Sensor For Digitally Controlled Power Supplies
S. Ziegler, L.J. Borle, Herbert Ho‐Ching Iu · Australian Journal of Electrical & Electronics Engineering · 2008
Twenty years ago, R. Severus presented a transformer-based circuit that is able to measure DC currents. However, this circuit did not experience a break-through in the industry or even academic world because it requires too many components and is unable to measure small currents. This paper enhances this circuit so that it becomes feasible to measure currents down to zero. The circuit complexity is no longer an obstacle because in digital controlled power supplies the DSP provides the required auxiliary functionalities. The feasibility of the proposed circuit has been proven by hardware experiment.