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Remote transmission IEPE type charge amplifier

A charge amplifier and long-distance transmission technology, applied in the direction of charge amplifier, etc., can solve the problem that the cable length measurement accuracy is greatly affected, and achieve the effect of reducing the output interface

Active Publication Date: 2013-09-04
CHENGDU KAITIAN ELECTRONICS
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AI Technical Summary

Problems solved by technology

Compared with the charge amplifier, the voltage amplifier has simple circuit, fewer components, cheaper price, and reliable operation. However, the cable length has a great influence on the measurement accuracy, and the use of the charge amplifier can make the sensitivity of the sensor less than that of the cable under certain conditions. length independent

Method used

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  • Remote transmission IEPE type charge amplifier
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  • Remote transmission IEPE type charge amplifier

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Embodiment Construction

[0013] refer to figure 1 . The most basic unit of the long-distance transmission IEPE type charge amplifier circuit is composed of a charge feedback capacitor C1, a high input impedance operational amplifier and a field effect transistor, in which the feedback capacitor C1 and the operational amplifier A form a charge amplifier, capacitors C2, C3 and Field effect tubes form the IEPE interface conversion circuit. The input signal of the IEPE type charge amplifier for long-distance transmission is a sensor based on the piezoelectric principle or an input device expressed in the form of charge. It is mainly composed of a high input impedance operational amplifier, a charge feedback capacitor C1, a series capacitor C2, and a field effect tube. Composed of capacitor C3, in which the high input impedance operational amplifier and charge feedback capacitor C1 constitute the charge amplifier, capacitors C2, C3 and field effect transistor constitute the IEPE interface conversion circu...

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Abstract

The invention provides a remote transmission IEPE type charge amplifier which comprises the charge amplifier and an IEPE interface circuit. The remote transmission IEPE type charge amplifier is characterized in that the charge amplifier is composed of a charge feedback condenser C1 and an operational amplifier A, the charge feedback condenser C1 is connected to the two ends of the operational amplifier A in parallel, a capacitor C2 and a field-effect transistor are connected with each other in series and then are connected with a capacitor C3 in parallel to form the IEPE interface switching circuit of a piezoelectric accelerometer, the sum of the distributed capacitance Cd of an input cable of the IEPE type charge amplifier and the capacitance Ca which inputs to the piezoelectric accelerometer is equal to Ct, transmission gain is adjusted by means of the feedback effect of the C1, the output negative feedback voltage VO is equal to Q / C1, and Q represents the output charge of the piezoelectric accelerometer. By means of the remote transmission IEPE type charge amplifier, charge and voltage conversion, impedance conversion, gain amplification are conducted on the charge signals output by the piezoelectric accelerometer, the IEPE interface is supplied, and the transmission distance is larger than or equal to 100km.

Description

technical field [0001] The invention relates to an IEPE type charge amplifier with a transmission distance not less than 100km in the field of piezoelectric acceleration sensors, especially an integrated circuit capable of realizing charge conversion, amplification and impedance transformation. Background technique [0002] IEPE refers to a piezoelectric acceleration sensor with its own charge amplifier or voltage amplifier. IEPE is an acronym for Piezoelectric Integrated Circuit. The high-sensitivity signal processing circuit integrated in IEPE makes it as close as possible to the sensor to ensure better noise immunity and easier packaging. Piezoelectric accelerometer has always been the main tool for transient variable measurement due to its small size, light weight, high natural frequency and wide dynamic range, high compressive strength, good linearity, and small temperature coefficient. Generally, a type of sensor developed based on the dielectric piezoelectric effect...

Claims

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Application Information

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IPC IPC(8): H03F3/70
Inventor 黄伟包绍明
Owner CHENGDU KAITIAN ELECTRONICS
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