Lossless current sensing in low-voltage high-current DC/DC modular supplies
Dallago, E.
Passoni, M.
Sassone, G.
Dept. of Electr. Eng., Pavia Univ., Italy;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec 2000
Volume: 47,
Issue: 6
On page(s): 1249- 1252
ISSN: 0278-0046
INSPEC Accession Number: 6784959
Digital Object Identifier: 10.1109/41.887952
Current Version Published: 2002-08-06
Abstract
New data processing ICs require low-voltage high-current supplies together with high reliability and efficiency. The use of a modular power supply would be the ideal solution, but it requires detecting the current in each module, and resistive shunts are usually used. In this paper, a new lossless current-sensing circuit is presented. This lossless current transducer is obtained by applying the technique used to compensate the parasitic inductance in resistive shunts to the filter inductor of the DC/DC power supply. The causes that can influence transducer response are investigated. The current sensing was implemented in a modular DC/DC power supply and experimental results are reported.
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