Auto-measurement and calibration of DC resistance in current...

Coded data generation or conversion – Converter calibration or testing

Reexamination Certificate

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C702S085000

Reexamination Certificate

active

07986254

ABSTRACT:
The present invention pertains to calibration in current sensing applications. Power conversion systems such as those used in computer architectures may employ step down converters such as buck converters or other types of converters. The present invention provides calibration processes and devices to account for various parasitic resistances which are found in such systems. A calibration circuit may be coupled to the buck converter or other power conversion to determine a calibrated voltage signal for the output of the power converter. An effective DC resistance may be determined and programmed for use by a control device used. In this way, the parasitic resistances are taken into account to obtain an accurate estimate of the actual current. In turn, this enables power converters and other devices to operate within specification requirements.

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Dong et al., “DCR Current Sensing Method for Achieving Adaptive Voltage Positioning (AVP) in Voltage Regulators with Coupled Inductors,” The Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State university, before the date of this instant application, 7 pages.
Nagaraja et al.,“Design and Analysis of Four-Phase Synchronous Buck Converter for VRM Applications,” Indian Institute of Technology, Kharagpur, 721302, Dec. 20-22, 2004, pp. 575-580.
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