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Signal pre-amplifier circuit of aerospace-grade photoelectric encoder

A technology of pre-amplification circuit and photoelectric encoder, which is applied in the direction of DC-coupled DC amplifier and differential amplifier, and can solve the problems of not meeting the requirements of aerospace use

Inactive Publication Date: 2012-02-15
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also some shortcomings: there are adjustable components in the circuit - potentiometer 1, potentiometer 2 and bias adjustment potentiometer 5, which do not meet the requirements of aerospace use

Method used

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  • Signal pre-amplifier circuit of aerospace-grade photoelectric encoder
  • Signal pre-amplifier circuit of aerospace-grade photoelectric encoder
  • Signal pre-amplifier circuit of aerospace-grade photoelectric encoder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] The invention according to figure 2 The structure shown is implemented where:

[0036] Amplifier 18 is an aerospace-grade general-purpose operational amplifier LM158 produced by National Semiconductor Corporation of the United States;

[0037] Resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, resistor R15, resistor R16 and resistor R17 use domestic 0805 packaged aerospace grade resistors.

[0038] The resistance value of resistor R7 and resistor R10 is 15KΩ;

[0039] The resistance value of resistor R13, resistor R14 and resistor R15 is 240KΩ;

[0040] The resistance value of resistor R16 and resistor R17 is 5.6KΩ;

[0041] Resistor R8, resistor R9, resistor R11 and resistor R12 are optional resistors, the selection process:

[0042] (1) Replace the optional resistors (R8 / / R9, R11 / / R12) with two potentiometers (the center tap is short-circuited with one end), and adjust the resistance of the potentiometer so ...

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Abstract

The invention relates to a signal pre-amplifier circuit of an aerospace-grade photoelectric encoder, belonging to a signal amplifier circuit involved in the technical field of photoelectric encoders and aiming at solving the technical problem of providing the signal amplifier circuit of the aerospace-grade photoelectric encoder. The technical scheme of the invention is that: the signal pre-amplifier circuit comprises a first to a third input resistors, a first to a third inverted input resistors, a negative feedback resistor, a first to a fourth bias resistors and an amplifier; after the second positive input resistor and the third positive input resistor are connected in parallel, one end is grounded and the other end is connected with the first positive input resistor, and the other end of the first positive input resistor is connected with a positive input pin of the amplifier; after the second inverted input resistor and the third inverted input resistor are connected in parallel, one end is grounded and the other end is connected with the first inverted input resistor, and the other end of the first inverted input resistor is connected with the negative input pin of the amplifier; one end of the negative feedback resistor is connected with an output pin of the amplifier, and the other end of the negative feedback resistor is connected with the nvegative input pin of the amplifier; after the second bias resistor and the third bias resistor are connected in parallel, one end is connected with a positive power supply V+, the other end is connected with the fourth bias resistor in series, and the other end of the fourth bias resistor is grounded; and one end of the first bias resistor is connected with the positive input pin of the amplifier, and the other end of the first bias resistor is connected with a connection point A of the second bias resistor, the third bias resistor and the fourth bias resistor.

Description

technical field [0001] The invention belongs to the technical field of photoelectric sensors and relates to a signal preamplification circuit of a photoelectric encoder used in the focusing mechanism of an aerospace camera. Background technique [0002] Aerospace products have extremely strict requirements on reliability, and the selection range of electronic components is relatively narrow. Some adjustable components (such as: potentiometers) are not allowed to go to the sky, causing some circuits with mature original technology to be unusable. The original circuit is usually a circuit with high reliability, simple design, convenient adjustment and low cost through experimental verification. The pre-amplification circuit of the encoder belongs to this type of circuit. Its function is to convert and adjust the photoelectric current signals of different sizes output by the photoelectric encoder into voltage signals with the same amplitude and amplify them. The adjustable co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 龙科慧吕世良王国良杨亮
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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