Signal processing circuit and device for non-contact position sensor

Abstract

The invention belongs to the technical field of the electronic circuit, and provides a signal processing circuit and device for a non-contact position sensor. An oscillation signal is provided for anexciting coil through an oscillation module, and a plurality of induction coils output corresponding induction signals after the mutual inductance with the exciting coils occurs when a location of therotor is changed, a digital signal is output to a digital signal processing module so as to compute and reduce the location information of the rotor after a synchronization rectification module performs the rectification, a switch module performs the gating, a filter module performs the filtering, an amplification module performs the signal amplification and an analog-digital conversion module performs the analog-to-digital conversion, so that an electronic control module performs analysis processing and makes the corresponding execution control; and meanwhile, a multi-phase clock productionmodule is used for adjusting phases of multiple collection ports in the synchronization rectification module in real time so as to correct the location information; the effect of precisely acquiring and correcting the rotor location information is realized, thereby precisely detecting a mechanical device connected with the rotor.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a signal processing circuit and device for a non-contact position sensor. Background technique [0002] With the development of vehicle electronic control systems, non-contact position sensors are widely used in electronic control systems such as automotive electronic power steering systems, accelerator pedals, throttle control, automatic seat adjustment, and rearview mirror adjustment. A typical electromagnetic induction non-contact position sensor has a metal rotor with a specific shape, a PCB single board, and a dedicated signal processing chip. The mutual inductance between the excitation coil and the induction coil on the PCB board will change periodically. Specifically, the sinusoidal signal of the induction coil is filtered by a synchronous rectifier and a low-pass filter and converted into an approximate DC signal, and then the automatic gain contr...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a signal processing circuit and device for a non-contact position sensor, aiming at solving the loss of the output signal of the half-wave synchronous rectification in the existing control technology for the non-contact position sensor. As a result, the obtained rotor position information is deviated, resulting in inaccurate detection results.

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