Signal conditioning circuit of airplane wheel speed sensor

Abstract

The embodiment of the invention discloses a signal conditioning circuit of an airplane wheel speed sensor. A first in-phase input end of an amplifier in an amplification sub-circuit is connected to asignal input end through resistors R102 and R103; one end of the resistor R102 is grounded through a capacitor C3 and a resistor R109; one end of the capacitor C3 is connected to a first reverse inputend through a resistor R108, the first reverse input end is connected to a first output end through a capacitor C4, and the first reverse input end is connected to the output end of the amplificationsub-circuit through resistors R112 and R113*; a second in-phase input end of an amplifier in the output end filtering sub-circuit is coupled, the second in-phase input end is grounded through a capacitor C2, and a second reverse input end is connected with the second output end of the amplifier. According to the embodiment of the invention, the problems that the wheel speed sensor is limited by the structure and the size, the output amplitude is saturated, and the higher anti-interference capability requirement proposed by a brake control system cannot be met are solved.

Description

technical field [0001] This application relates to but not limited to the technical field of aircraft brake sensor speed measurement, especially a signal conditioning circuit of a wheel speed sensor. Background technique [0002] With the application of electronic anti-skid braking system technology becoming more and more mature, a large number of aircraft have installed this system. The wheel speed sensor is an important part of the electronic anti-skid braking system. The proportional frequency signal is sent to the controller, and the controller decides whether to brake according to the frequency signal. It can be seen that the quality of the wheel speed sensor and the measurement accuracy have an important impact on the normal operation of the brake system. [0003] With the gradual increase in the demand for automatic anti-skid braking systems, the requirements for the anti-interference ability of the wheel speed signal are getting higher and higher. However, due to the...

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Problems solved by technology

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a signal conditioning circuit for a wheel speed sensor to solve the problem of the existing excitation wheel speed sensor structure and Due to the size limit, the magnetic flux variation in the magnetic circuit has reached saturation, so that the output amplitude has reached saturation, which leads to the problem that the higher anti-interference ability requirements proposed by the brake control system cannot be met.

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