Low-power-consumption servo circuit for quartz flexure accelerometer

Abstract

The invention discloses a low-power-consumption servo circuit for a quartz flexure accelerator. A grounding end of a main circuit chip is connected with a positive power output end and a negative power output end through two capacitors respectively; the positive power output end is connected with a transistor T1, a transistor T2 and a transistor T3 through a resistor R9, a resistor R10 and a resistor R11 respectively; a base electrode of the transistor T1, a base electrode of the transistor T2 and a base electrode of the transistor T3 are respectively connected with an upper output end of an amplifier; an emitting electrode of the transistor T1 is connected with an emitting electrode of a transistor T4 via a resistor R12 and a resistor R13; a collector electrode of the transistor T4 is connected with the negative power output end via a resistor R14; a collector electrode of the transistor T2 is connected with a collector electrode of a transistor T5; an emitting electrode of the transistor T5 and an emitting electrode of the transistor T6 are connected with the negative power output end via two resistors respectively; a collector electrode of the transistor T3 is connected with a collector electrode of the transistor T6; a base electrode of the transistor T4, a base electrode of the transistor T5 and a base electrode of the transistor T6 are respectively connected with a lower output end of the amplifier; and a collector electrode of the transistor T3 is connected with a reverse-phase input end of the amplifier via a feedback network. The low-power-consumption servo circuit can be powered by + / -5V direct-current power, and is suitable for field operation; and the static power consumption of the accelerator can be lower than 50mW.

Description

technical field [0001] The invention relates to a servo circuit for a quartz flexible accelerometer, in particular to a low power consumption servo circuit for a quartz flexible accelerometer. Background technique [0002] The quartz flexible accelerometer mainly measures the acceleration of the carrier through the principle of force feedback. Its main structural form is composed of a torque device, a detection mass pendulum assembly, a differential capacitance sensor, and a servo circuit. During the working process of the accelerometer, when there is acceleration along the input axis of the accelerometer, the detection mass pendulum assembly deflects, the servo circuit detects this change, converts it into a corresponding current to feed back to the torque device, and makes the detection mass pendulum assembly return To the original position, the magnitude of the current is proportional to the input acceleration. [0003] Refer to the attached schematic diagram of the tra...

AI Technical Summary

Problems solved by technology

The average positive / negative static working current of the entire servo circuit is not less than 10mA, that is, the static power consumption of the quartz flexible accelerometer is greater than 300mW

[0004] Traditional quartz flexible accelerometers are mostly powered by ±15V DC power supply. With the deepening of the application of quartz flexible accelerometers in the petroleum industry, in-situ measurement systems, vibration measurement and geophysical prospecting fields, batteries are often used for field operations in these applications. The static power consumption of the quartz flexible accelerometer is required to be less than 100mW, and the traditional quartz flexible accelerometer cannot meet the requirements

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