| 主权项 |
1. A hardware-only contactless position sensor system, comprising:
a contactless position sensor on a printed circuit board comprising an excitation coil, a sine coil, a cosine coil, and a plurality of fine coils located between the sine coil and the cosine coil, wherein the excitation coil forms a rectangular loop around the sine coil, the cosine coil, and the fine coils; 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;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 relative to the contactless position sensor;a phase conditioning circuit coupled to the phase detector circuit, wherein the phase conditioning circuit applies a phase correction to the output voltage; anda double balanced mixer coupled to the phase conditioning circuit, wherein the double balanced mixer establishes a phase polarity for the phase conditioning circuit. |
