SU1610327A1 - Pressure-to-el signal converter - Google Patents

Abstract

This invention relates to a measurement technique and improves the accuracy of converting pressure to an electrical signal. The voltage from the divider 8 and the strain-resistant bridge 2 is fed to the signal inputs of the switch 9, controlled by the driver 10. At the output of the switch, a sequence of signals characterizing the informative and scaling voltage is formed. The signals from the output of the switch 9 through the modulator 11 and the amplifier 4 are fed to the first input of the adder 13, to the second input of which through the modulator 12, the weakening unit 15 and the switch 16 is supplied with the supply voltage for balancing the strain gauge. The modulators 11, 12 and shaper 14 serve to eliminate the effect of bias voltages in amplifier 4 and block 15 on the measurement accuracy. The temperature stabilization of the strain-resistant bridge is carried out by the amplifier 3 and the heater 6. 1 sludge.

Description

3. 16

The invention relates to a measurement technique and can be used in devices for measuring pressure.

The purpose of the invention is to increase the accuracy of pressure conversion into an electrical signal.

The drawing shows a structural diagram of the proposed Converter.

The converter contains a semiconductor membrane I, a strain-resistant bridge 2 formed on the membrane, two differential amplifiers 3 and 4, a power supply 5, a heater 6, two dividers 7 and 8, and the divider 7 consisting of the resistors RI and Rj is thermostable

switch 9, shaper 10 channel time intervals, two modulators 11 and 12, cy1 1mator 13, shaper 14 clock pulses, block 15 attenuation of signals and key 16

The Converter operates as follows.

The voltages generated by the second voltage selector 8 voltage (scaling voltage) and the tensor-resistive bridge 2 (informative voltage) are fed to the signal inputs of the switch 9. As a result of Switches made using the shaper 10, the inputs to the control inputs switch 9, the output of switch 9 forms a sequence of signals characterizing the informative and scaling voltage supplied to its signal inputs, which through the modulator 11 and amplifier 4 are fed to the input su The mapper 13. To the second input of the adder 13, through the modulator 12, the signal attenuating unit 15, and the key 16 are supplied with the supply voltage, which is used to balance the tensor-resistive bridge 2 by adding it to the amplified output voltage of the bridge. The modulators 11 and 12 and the shaper 14 of clock pulses to eliminate the effect of bias voltages in the amplifier 4 and block 15 on the measurement accuracy by converting the inputs to their inputs of constant voltage into variables with their subsequent demodulation at the output of the adder 13.

The temperature stabilization of the strain gauge bridge 2 is accomplished by amplifying the signal 3 with the amplifier.

removed from the output of the first divider 7 and from the point L of the connection of the second divider 8 with a strain-resistant bridge 2, followed by an amplified signal to the heater 6.

Transformation characteristics of the converter are the ratio of the variable components of informative and scaling stresses.

Claims (2)

1. Pressure transducer into an electrical signal containing a strain-resistant bridge formed on the membrane of the pressure sensor, two differential amplifiers, a heater and a power source, which is characterized by the fact that, in order to improve the measurement accuracy, two re- - a transistor voltage divider, a switch, a time interval driver, two modulators, an adder, a clock driver, a signal attenuator, and a key, with the power source connected to the input of the first divides It also has a voltage connected to a circuit consisting of a series-connected second divider and a tensor-resistive bridge, the output of the first divider and the connection point of the second divider with the tensor-resistive bridge being connected to. the inputs of the first differential amplifier, to the output of which the heater is connected, and the outputs of the second divider and the strain gauge of the BN bridge are connected to the signal inputs of the switch, the control inputs of which are connected to the first two outputs of the time interval generator, the third output of which is connected to the control key input, output the switch is connected to the signal input of the first modulator, the output of which is connected to the input of the second differential amplifier, the output of which is connected to the first su input The mapper, the control inputs of the modulators are connected to the output of the clock pulse generator, the signal input of the second modulator is connected to the power supply, its output is connected to the input of the signal attenuation unit, the output of which is connected to the signal input of the key. 5 1610327 connected to the output with the second entrance, filled out of heat stable house adder, with the output of the sum-material. the mator is the output of transform-3. A converter as claimed in claim 1, dt, lich 2. The converter according to claim 1, O t is the resistors of the First Divider, which is tentatively due to the fact that they are not formed on the non-deformable resistors of the first divider of the same part of the membrane.