HARDWARE-ONLY CONTACTLESS POSITION SENSOR SYSTEM

摘要

A hardware-only contactless position sensor system is provided that includes a contactless position sensor and hardware-only sensor system electronics. The sensor includes excitation, sine, and cosine coils. The electronics are coupled to the sensor and detect a position of a target relative to the sensor. The electronics include a phase shift and summation circuit that applies a phase shift at a frequency of the excitation coil to one of a sine signal from the sine coil or a cosine signal from the cosine coil as a phase shifted signal and add the phase shifted signal with an unshifted instance of the cosine or sine signal to produce a phase shifted output. The electronics also include a phase detector circuit that detects a phase of the phase shifted output and generate an output voltage corresponding to the phase and proportional to the position of the target.

主权项

1. A hardware-only contactless position sensor system, comprising:
a contactless position sensor comprising an excitation coil, a sine coil, and a cosine coil; and hardware-only sensor system electronics coupled to the contactless position sensor, the hardware-only sensor system electronics detect a position of a target relative to the contactless position sensor, the hardware-only sensor system electronics comprising:
a phase shift and summation circuit that applies a phase shift at a frequency of the excitation coil to one of a sine signal from the sine coil or a cosine signal from the cosine coil as a phase shifted signal and add the phase shifted signal with an unshifted instance of the cosine or sine signal to produce a phase shifted output; anda phase detector circuit that detects a phase of the phase shifted output and generate an output voltage corresponding to the phase and proportional to the position of the target relative to the contactless position sensor.