Systems and methods for monitoring and compensation of analog to digital converter reference voltages

摘要

The present disclosure provides systems and methods for identifying changes in and failures of a reference voltage of an analog to digital (A/D) converter. A non-scalar function of the reference voltage of the A/D converter can be determined and output to the A/D converter. The A/D converter is configured to output a digital value to the A/D conversion system, wherein the digital value corresponds to the non-scalar function of the reference voltage. The A/D conversion system decodes the non-scalar function of the reference voltage with a corresponding inverse function, and may determine the drift factor associated with the reference voltage. The A/D conversion system can report a change in, or a failure of, the A/D converter or its reference voltage, and can operate or prevent operation of protection elements.

主权项

1. An analog to digital (A/D) conversion system, comprising:
an A/D converter; a calibrated reference module to identify a calibrated voltage reference value, VrefCAL, associated with the A/D converter; a non-scalar module to receive a reference voltage, Vref, wherein the reference voltage, Vref, corresponds to the calibrated reference voltage, VrefCAL, multiplied by a drift factor, α, such that Vref=αVrefCAL, and wherein the non-scalar module outputs a non-scalar function of the reference voltage, N(Vref), to the A/D converter; a drift factor module to identify an inverse function of the non-scalar function and to calculate the drift factor, α, based on an inverse function of a first digital value, Vdig, output by the A/D converter and corresponding to the non-scalar function of the reference voltage, N(Vref), wherein the first digital value, Vdig, corresponds to a ratio of the calibrated voltage reference value, VrefCAL, and the reference voltage, Vref, such that the first digital value, Vdig, can be expressed as the non-scalar function of the calibrated reference voltage multiplied by the drift factor divided by the drift factor, such thatVdig=N⁡(α⁢⁢Vref)α;and
an adjustment module to adjust at least one voltage value associated with the A/D converter using the calculated drift factor, α.