Device and method for improving signal intensity of inductive angle sensor

Abstract

The invention discloses a device and a method for improving the signal strength of an inductive angle sensor, the device is composed of an LCC-S resonant coupling circuit module, a fully differential operational amplifier circuit module and an adjustable phase shift detection circuit module, the LCC-S resonant coupling circuit module comprises a stator module and a rotor module, and the method comprises the following steps: a square wave signal generated by a microprocessor in an induction type angle sensor generates an excitation signal through an LCC-S resonant coupling circuit module, the excitation signal generates a pulse diagnosis breath magnetic field on a rotor module, and two paths of differential electric signals with angle positions are generated through coupling of the pulse diagnosis breath magnetic field; the fully differential operational amplification circuit module is used for extraction and amplification; and detection and filtering are performed through an adjustable phase shift detection circuit module to obtain sine and cosine signals vS = Vssin (theta m) and vc = Vccos (theta m) from which carrier signals are removed for subsequent angle operation. Through the method, the signal intensity of the inductive angle sensor can be increased, and the anti-interference capability and reliability of the inductive angle sensor are improved.

Description

technical field [0001] The invention belongs to the technical field of signal simulation and testing, in particular to a device and method for improving the signal strength of an inductive angle sensor. Background technique [0002] The inductive angle sensor mainly obtains the angular position signal by solving the mutual inductance coupling signal of the planar coil, so the sensor coupling signal strength has a great influence on the sensor's accuracy, anti-interference ability, reliability and other indicators. At present, the coupling signal is mainly affected by the strength of the stator excitation signal and the detection method. The traditional inductive angle sensor adopts series-series (S-S) resonant topology to transmit the excitation signal. Since the mutual inductance of the stator excitation coil and the rotor pickup coil of the inductive angle sensor is relatively small, the leakage inductance is large, and the power factor of the excitation signal transmissio...

AI Technical Summary

Problems solved by technology

The traditional inductive angle sensor adopts series-series (S-S) resonant topology to transmit the excitation signal. Since the mutual inductance of the stator excitation coil and the rotor pickup coil of the inductive angle sensor is relatively small, the leakage inductance is large, and the power factor of the excitation signal transmission is small. The excitation signal received by the rotor is weak, so that the final stator coupled signal is also weak

At the same time, the traditional inductive angle sensor uses a pull-up circuit to extract high-frequency induction signals and perform multiplier detection with a fixed phase shift. The voltage division of the pull-up resistors and the phase mismatch between the detection signal and the coupling signal will further weaken the induction signal. Intensity, and the follow-up circuit needs a higher multiple of amplification, resulting in a reduction in the anti-interference ability of the inductive angle sensor, which is greatly affected by temperature

Images