Patent ID: 9671249
Date: 2017-06-06
CPC Classifications: G01D,G01R

Claim:
1. A system, comprising: broken wire detector circuitry comprising an optocoupler; encoder isolator circuitry comprising input voltage protection circuitry, an optocoupler, and output filtering circuitry; and compensator circuitry comprising signal conditioning circuitry; and wherein the broken wire detector circuitry and the encoder isolator circuitry are configured to accept inputs signals (A, B) and an index signal (Z) for a single-ended and differential type incremental encoder, the broken wire detector circuitry is configured to convert an input AC pulse train signal to an analog DC signal, the encoder isolator is configured to protect from high input voltages, and the compensator is configured to accept outputs of the broken wire detector circuitry and the encoder isolator circuitry and to integrate and dampen the analog DC signal that has a value representative of an operating state of the incremental encoder; and wherein the analog DC signal value output by the compensator circuitry represents the operating state of the incremental encoder comprising whether the encoder is changing speeds during normal operation, the encoder is stalling, or if there is a broken wire for any of the three input signals to the encoder; and wherein the analog DC signal produced during normal operation has a DC value with an attenuated ripple, the analog DC signal produced during stalling has a fixed non-zero DC value, and the analog DC signal produced by a broken wire has a value of zero.