Title :
High Precision Load Current Sensing using On-Line Calibration of Trace Resistance in VRM Applications
Author :
Eirea, Gabriel ; Sanders, S.R.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA
Abstract :
A method for the on-line calibration of a circuit board trace resistance at the output of a buck converter is described. The input current is measured with a precision resistor and processed to obtain a DC reference for the output current. The voltage drop across a trace resistance at the output is amplified with a gain that is adaptively adjusted to match the DC reference. This method is applied to obtain an accurate and high-bandwidth measurement of the load current in the modern microprocessor voltage regulator application (VRM), thus enabling an accurate DC load-line regulation as well as a fast transient response. Experimental results show an accuracy well within the tolerance band of this application, and exceeding all other popular methods
Keywords :
calibration; modules; power convertors; power engineering computing; transient response; voltage regulators; DC load-line regulation; buck converters; circuit board trace resistance online calibration; load current sensing; microprocessor voltage regulator module applications; transient response; voltage drop; Buck converters; Calibration; Current measurement; Electrical resistance measurement; Microprocessors; Printed circuits; Regulators; Resistors; Transient response; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 2006. PESC '06. 37th IEEE
Conference_Location :
Jeju
Print_ISBN :
0-7803-9716-9
DOI :
10.1109/PESC.2006.1711952
