Digital closed loop servo circuit applied to quartz flexible accelerometer

Abstract

The invention relates to a digital closed loop servo circuit applied to a quartz flexible accelerometer, which comprises a differential capacitor detection circuit, a triangular wave generating circuit, a pre-filtering amplifying circuit, an A / D conversion circuit, a D / A conversion circuit, a drive amplifying circuit and a digital signal processing circuit, wherein the triangular wave generating circuit is connected with the input end of the differential capacitor detection circuit, the differential capacitor detection circuit is connected with a differential capacitor of a meter mechanical part of the quartz flexible accelerometer, the differential capacitor detection circuit is connected with the pre-filtering amplifying circuit, the pre-filtering amplifying circuit is connected with the A / D conversion circuit, the digital signal processing circuit is connected with the A / D conversion circuit, the digital quantity output by the digital signal processing circuit is connected with a navigation computer through an output end and is connected with the D / A conversion circuit through the output end at the same time, the D / A conversion circuit is connected with the drive amplifying circuit, and a current signal output by the drive amplifying circuit is connected with a torque coil of the meter mechanical part of the quartz flexible accelerometer through the output end of the drive amplifying circuit.

Description

Technical field: [0001] The invention relates to a digital closed-loop servo circuit of a quartz flexible accelerometer used for measuring carrier acceleration, which belongs to the technical field of detection circuits. Background technique: [0002] At present, the quartz flexible accelerometer is composed of two parts: the mechanical part of the meter head and the analog servo circuit part. The mechanical part of the meter head is composed of a torque coil, a quartz pendulum, and an upper and lower torque device; and the analog servo circuit part is composed of a differential capacitance detection circuit. , an integrating circuit, and a transconductance compensation amplifier circuit. Among them, when there is an acceleration input, the quartz pendulum deviates from the equilibrium position, so the differential capacitance value of the mechanical part of the meter head changes. The differential capacitance detection circuit in the analog servo circuit converts the diffe...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a digital closed-loop servo circuit of a quartz flexible accelerometer to overcome the problem of precision loss caused by the conversion of the digital circuit after the existing analog current feedback output

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