Auto-measurement and calibration of DC resistance in current sensing applications

摘要

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.

主权项

1. A method for calibrating a power conversion circuit, the method comprising:
deriving a pre-calibration voltage associated with a power conversion circuit; calibrating an error based on a measured voltage of the power conversion circuit; deriving a calibrated voltage based on the pre-calibration voltage and a voltage differential using the calibrated error; and regulating operation of the power conversion circuit using the derived calibrated voltage.