CN201173760Y

CN201173760Y - Differential transformer location signal amplification transmission equipment

Info

Publication number: CN201173760Y
Application number: CNU2008200119453U
Authority: CN
Inventors: 马云鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-04-03
Filing date: 2008-04-03
Publication date: 2008-12-31
Anticipated expiration: 2018-04-03

Abstract

The utility model discloses a position signal amplifying transportation device for a differential transformer which belongs to the technical field of electronic control and comprises a voltage conversion circuit, a signal conditioning circuit, a signal amplifying output circuit, a voltage and current conversion circuit and a window differentiation and comparison display circuit, wherein, the signal conditioning circuit is respectively connected with a sensor, the voltage conversion circuit, the window differentiation and comparison display circuit and the signal amplifying output circuit; the voltage and current conversion circuit is connected with the signal amplifying output circuit; the signal conditioning circuit receives signals of the sensor to transfer the signals of the sensor to the signal amplifying output circuit and the window differentiation and comparison display circuit respectively, and the voltage and current conversion circuit supplies power for the signal conditioning circuit and the voltage and current conversion circuit respectively after converting the voltage. The position signal amplifying transportation device for the differential transformer realizes output of signals of a plurality of kinds, also realizes a plurality of kinds of signal output and LED position state display, and has the advantages of simple structure, stable performance, low manufacture cost and favorable practicability and popularization.

Description

A kind of differential transformer position signalling amplifies transmitting device

Technical field

The utility model belongs to electron controls technology, and particularly a kind of differential transformer position signalling amplifies transmitting device.

Background technology

Differential transformer displacement sensor is a electronic product, frequent and hydraulic cylinder is used in combination, be applied in the higher Hydraulic Position Control System of accuracy requirement, the action principle of the similar transformer of principle of work mainly includes armature, winding and Secondary Winding etc.As shown in Figure 1, the coupling energy between first and second winding changes with moving of armature, i.e. mutual inductance between winding changes with tested displacement.Owing to adopt two Secondary Winding oppositely to be connected in series in use, export in differential mode, so is this scales the differential transformer type inductance sensor, is called for short differential transformer usually, the electric signal output that it produces is directly proportional with the displacement of its separate type iron core.Early stage supporting with it hardware circuit design all is to realize with small scale integration and resolution element.Except forming the prime input circuit by ac signal amplifiers, phase-sensitive detector (PSD), low-pass filter, direct current signal amplifier, also need one of special design independently, the sine-wave oscillator of frequency stabilization.Sine-wave oscillator output two-way constant amplitude, same sine wave signal frequently, one tunnel excited signal as cell winding; One tunnel reference signal as phase-sensitive detector (PSD).But, can not realize phase sensitive detection because the path difference that two paths of signals is walked can produce different phase shifts in the path.In order to realize phase sensitive detection, must between sine-wave oscillator and phase sensitive detection, increase a phase shifter by device.Because it is excessive that residual voltage at zero and temperature are floated, and causes measuring accuracy relatively poor, thereby the precision that has limited surveying instrument improves.

The utility model content

In order to solve the weak point of prior art, the utility model provide a kind of simple in structure, profile is small and exquisite and have Presentation Function, a kind of differential transformer position signalling that degree of accuracy is high amplifies transmitting device.

This device comprises voltage conversion circuit, signal conditioning circuit, signal amplification output circuit, voltage-current converter circuit, window discrimination ratio is than display circuit, and wherein signal conditioning circuit is connected than display circuit, signal amplification output circuit with sensor, voltage conversion circuit, window discrimination ratio respectively; Voltage-current converter circuit is connected with the signal amplification output circuit, wherein the signal of signal conditioning circuit receiving sensor passes to signal amplification output circuit, window discrimination ratio respectively than display circuit, and voltage-current converter circuit is given signal conditioning circuit, voltage-current converter circuit power supply later on respectively with voltage transitions.

The signal of this device output both can DC voltage output also can convert 0～20mA to, 4～20mA, the output of multiple standards signals such as 5～25mA.Output signal is shown by the LED lamp than display circuit that by window discrimination ratio signal also can directly enter single-chip microcomputer, secondary instrument, PLC etc. and participate in control.

The beneficial effects of the utility model are: sine-wave oscillator, ac signal amplifiers, phase-sensitive detector (PSD), direct current signal amplifier before an AD598 chip has replaced fully.Solved because residual voltage at zero and temperature are floated excessively, caused measuring accuracy relatively poor, thereby improved the precision of surveying instrument; Realize the output of multiple signal simultaneously, satisfied user's requirement; Realized that also multiple signal output and LED location status show.Simple in structure, stable performance, low cost of manufacture, practical generalization is good.Designed signal conditioning circuit has greatly improved the temperature drift problem, has solved the residual voltage at zero problem of early signal modulate circuit.This is crucial in high temperature, strong noise industrial environment.Measuring accuracy can reach full scale ± 1%, and cost reduces by 20%.Apparatus structure is simple, small and exquisite simultaneously, also is convenient to the technician and carries, and can use at measuring room, also can be installed in the production scene test.

Description of drawings

Fig. 1. the structural representation of differential transformer;

Fig. 2. position signalling of the present utility model amplifies the transmitting device theory diagram;

Fig. 3. position signalling of the present utility model amplifies the circuit diagram of transmitting device.

Among the figure: 1 windings, 2 first Secondary Winding, 3 second Secondary Winding, 4 armature.

Embodiment

In conjunction with the accompanying drawings the utility model is described further:

As shown in Figure 2, be that position signalling amplifies the transmitting device theory diagram, introduced the principle of this amplifier.This device comprises voltage conversion circuit, signal conditioning circuit, signal amplification output circuit, voltage-current converter circuit, window discrimination ratio is than display circuit, and wherein signal conditioning circuit is connected than display circuit, signal amplification output circuit with sensor, voltage conversion circuit, window discrimination ratio respectively; Voltage-current converter circuit is connected with the signal amplification output circuit, wherein the signal of signal conditioning circuit receiving sensor passes to signal amplification output circuit, window discrimination ratio respectively than display circuit, and voltage-current converter circuit is given signal conditioning circuit, voltage-current converter circuit power supply later on respectively with voltage transitions.

As shown in Figure 3, be a kind of embodiment that position signalling of the present utility model amplifies transmitting device, wherein be the displacement of the lines differential transformer signal conditioning circuit of core with AD598; To amplify the signal amplification output circuit of the 0-10V output that chip signal output zooms into standard by UA741; The circuit of the voltage transitions that realizes by LT1021 similar models such as (perhaps) LT1019; Realize that by TCA965 window discrimination ratio is than display circuit; With similar models such as XTR110 is the voltage-current converter circuit of core.When working at the scene, need provide 24V DC voltage to amplifier, the 24V DC voltage converts the voltage of positive and negative 15V to by voltage conversion circuit, powers to chip AD598, to the LT1021 power supply, outputting standard 10V voltage signal is as a normal voltage of window discriminator circuit simultaneously.1 pin of chip AD598 connects-15V, and 20 pin of chip AD598 connect+15V, and C15, C16, C20 are the electric capacity that bandwidth is provided with.A chip AD598 part is that sine-

wave generator

2,3 pin are connected with primary coil, and sine-wave generator has constant amplitude and frequency, and is not subjected to time and Temperature Influence.Its frequency and amplitude all can be determined by the minority outward element; Another part of AD598 is the secondary signal processing of displacement of the lines differential transformer, 10,11,17 pin of chip AD598 are connected with secondary coil, 17 pin are ground connection, produce a d. c. voltage signal that is directly proportional with the iron core displacement by this part, the signal of the 16 pin output 0-5V of chip AD598.This d. c. voltage signal enters the pin 3 of UA741, converts thereof into the d. c. voltage signal 0-10V output of standard through amplification.D. c. voltage signal by UA741 output enters the voltage-current converter circuit that XTR110 is a core simultaneously, signal with enter by pin 4, after inner precision resistance mixed-media network modules mixed-media, voltage/current conversion module, electric current/current transformation module and precision+10V voltage reference module, by triode T1 output current, realize 0-20mA, 4-20mA, 5-25mA output by toggle switch, see Table 1.

Table 1 toggle switch and output relation

1	2	3	4	Output
1	2	3	4	Output	Close	Open	Open	Open	0-20mA
Open	Close	Close	Close	4-20mA	Close	Open	Open	Open	0-20mA
Open	Close	Close	Close	4-20mA	Open	Close	Open	Open	5-25mA

By the d. c. voltage signal of AD598 output, enter provide reference voltage via LT1021 similar models such as (perhaps) LT1019 window discrimination ratio and display circuit.Its corresponding reference voltage is respectively 0V, 10V.By adjusting potentiometer P1, P2 proofreaies and correct the signal that enters TCA965.

Bearing calibration: press and force button SP1

When L1 is bright: signal＞0V, adjust the P2 potentiometer counterclockwise.

When L2 was bright: signal=0V, signal was accurate.

When L3 is bright: signal＜0V, adjust the P2 potentiometer clockwise.

In like manner, press pressure button SP2

When L4 is bright: signal＞10V, adjust the P1 potentiometer counterclockwise.

When L5 was bright: signal=10V, signal was accurate.

When L6 is bright: signal＜10V, adjust the P1 potentiometer clockwise.

When adjusting potentiometer P1, P2, hocket, must make hydraulic cylinder be in the most appropriate position.Potentiometer P3 adjusts differential transformer primary coil voltage, and best voltage is 3V, promptly meets the demands under this voltage status also to make chip can not burnt out when long-time the use.

Claims

1, a kind of differential transformer position signalling amplifies transmitting device, it is characterized in that this device comprises voltage conversion circuit, signal conditioning circuit, signal amplification output circuit, voltage-current converter circuit and window discrimination ratio than display circuit, wherein signal conditioning circuit is connected than display circuit, signal amplification output circuit with sensor, voltage conversion circuit, window discrimination ratio respectively; Voltage-current converter circuit is connected with the signal amplification output circuit, wherein the signal of signal conditioning circuit receiving sensor passes to signal amplification output circuit, window discrimination ratio respectively than display circuit, and voltage-current converter circuit is given signal conditioning circuit, voltage-current converter circuit power supply later on respectively with voltage transitions.

2, a kind of differential transformer position signalling according to claim 1 amplifies transmitting device, it is characterized in that adopting AD598 in the described signal conditioning circuit; Adopt UA741 or LM741 in the signal amplification output circuit; Adopt XTR110 in the voltage-current converter circuit; Adopt LT1021 or LT1019 in the voltage conversion circuit; Window discrimination ratio is than adopting TCA965 in the display circuit.

3, a kind of differential transformer position signalling according to claim 1 amplifies transmitting device, it is characterized in that described window discrimination ratio is connected to two groups of LED lamps than display circuit output.