Speed signal converter with reverse polarity detection and correction

A speed signal converter circuit comprising:

• an analog signal conditioning stage configured to determine a voltage of an input speed signal, combine the voltage with an alternating current (AC) injection voltage signal having a set frequency to generate a combined voltage signal, and output a pulsed zero-crossing signal including a rising edge and a falling edge indicating a zero-crossing of the input speed signal based on the combined voltage signal;
• and
• a digital signal processing stage in signal communication with the analog signal conditioning stage, the digital signal processing stage configured to determine a rising edge slope of the input speed signal and a falling edge slope of the input signal based on a rising edge and a falling edge of the pulsed zero-crossing signal, and to determine an optimal edge among either the rising edge or the falling edge based on a comparison between the rising edge slope and the falling edge slope,
• wherein the digital signal processing stage compares the optimal edge to an expected edge and detects a reverse wiring fault when the optimal edge does not match the expected edge.