RU2415442C1 - Compensation accelerometre - Google Patents

Abstract

FIELD: physics. ^ SUBSTANCE: proposed accelerometre comprises sensitive element with its angular position locked by angle pickup, two integrating amplifiers, moment pickup, two negative feedback circuits, one connecting angle pickup with adder input via integrating amplifier, negative feedback phase detector, differentiating filter, "sensitivity-zone"-element and voltage-to-current converter, all connected via data inputs. Another feedback circuit connects negative feedback detector output with adder input via smoothing filter, second integrating amplifier, comparator, level converter, pair of triggered synchronous generators, reversing binary counter, comparison circuit, threshold element and electronic switch, all connected via data inputs. ^ EFFECT: expanded bandwidth, higher accuracy. ^ 4 dwg

Description

The invention relates to measuring equipment and is intended for use in devices of the compensation type with a digital output in stabilization, navigation and guidance systems. It can find application in devices for measuring mechanical values of the compensation type.

A device for measuring accelerations is known (RF patent No. 2098833, class ⁶ G01P 15/13 publ. 10.12.97) containing a sensing element including two stationary electrodes and a movable plate, three amplifiers, two resistors, while the output of the first amplifier connected to the first resistor, and the input of the second amplifier is connected to the second resistor and is the output of the device. To increase the noise immunity when exposed to electrical noise, a reference voltage source, an electric signal generator, two transistor pairs, three resistors, two capacitors are introduced into it, which allow compensation of electrical noise due to the coverage of the amplifier with negative feedback.

The disadvantage of this device is the low accuracy of the measurement, since the choice of gain with hard negative feedback is limited by the condition of stability of the system.

The closest in technical solution is the device (described in AS No. 742801, published in the bulletin of inventions No. 23, 1980), containing a sensing element, an angle sensor, an integrating feedback amplifier, a torque sensor, an additional integrating amplifier, an electronic key , a threshold element, and the first output of the angle sensor is connected through an integrating feedback amplifier to the moment sensor, and the second output of the angle sensor through a threshold element and an additional integrating amplifier connected to the control input of the electric ronnogo key.

The disadvantage of this device is the low accuracy of the measurement, due to the accuracy of the integrating analog amplifiers and a threshold element. In addition, the accuracy of the measurement depends on the parameters of the electronic key circuit that selects the information. The main error of the device is associated with the finiteness of the charge time of the capacitor of the integrating amplifier. This error leads to an aperture error inherent in a similar sampling and information processing scheme.

The objective of the present invention is to expand the bandwidth of the compensation accelerometer and improve the accuracy of measurement.

This is achieved due to the fact that a phase detector of negative feedback is introduced into the compensation accelerometer containing a sensitive element, the angular position of which is fixed by an angle sensor, an integrating amplifier, a torque sensor, an electronic key, a threshold element, an additional integrating amplifier included in the negative feedback and additional feedback from the output of the angle sensor to the input of the adder, through an integrated amplifier connected in series through the information inputs, phase negative feedback detector, differentiating filter, deadband element, voltage-current converter, and the first negative feedback is formed from the output of the negative feedback phase detector to the adder input through a smoothing filter connected to the information inputs, an additional integrating amplifier, a comparator , level converter, a couple of waiting synchronous generators, a reversible binary counter, a comparison circuit, a threshold element, an electronic key the input of which is connected to the output of the current generator, the second input of the comparison circuit is connected to the output of the summing binary counter, and the additional inputs of the comparator, waiting for synchronous generators, the reversing binary counter and the summing binary counter are connected to the auxiliary frequency generator, additional inputs of the angle sensor, phase negative detector feedback are connected to the output of the reference voltage generator, and the output of the adder is connected to the input of the torque sensor, the outputs from the reversible binary frequency tchika voltage converter and - a current are respectively digital and analog output compensating accelerometer.

The introduction of negative feedbacks into the compensation accelerometer allows you to create a device operating in a self-oscillating mode, with deviation astatism and with an expanded passband.

Figure 1 shows a functional diagram of a compensation accelerometer; figure 2 is a structural diagram of a compensation accelerometer; figure 3, 4 - transients with a single exposure and the absence of a nonlinear element and integrator in feedback.

The compensation accelerometer contains a sensing element 1, the angular deviation of which captures the angle sensor 2. The output of the angle sensor 2 is connected to the input of the integrating amplifier 3. The output of the integrating amplifier 3 is connected to the input of the phase negative detector 4 (FDOOS), and the output of the FDOOS 4 is connected to the input differentiating filter 5, the output of the differentiating filter 5 is connected to the input of the element 6 ("dead zone"). The output of element 6 is connected to the input of the voltage-current converter 7, the output of which is connected to the input of the adder 8. The additional inputs of the angle sensor 2, FDOOS 4 are connected to the output of the reference voltage generator 9 (GON). The output of FDOOS 4 is connected to the input of the smoothing filter 10, the output of which is connected to an additional integrating amplifier 11. The output of the integrating amplifier 11 is connected to the input of the comparator 12. The output of the comparator 12 is connected to the input of the level converter 13, the outputs of which are connected to the inputs of a pair of waiting synchronous generators (ZhSG ) 14 and 15. The outputs of the ZhSG 14 and 15 are connected to the inputs of the reversible binary counter 16. The output of the reversible binary counter 16 is connected to the input of the comparison circuit 17. Another input of the comparison circuit 17 is connected to the output of the total the binary counter 18. The output of the comparison circuit 17 is connected to the input of the threshold element 19. The output of the threshold element 19 is connected to the input of the electronic key 20, the other input of the electronic key 20 is connected to the output of the current generator 21. The output of the electronic key 20 is connected to the input of the adder 8. Output the adder 8 is connected to the input of the torque sensor 22. Additional inputs of the comparator 12, ZhSG 14 and 15, a reversible binary counter 16, a summing binary counter 18 are connected to the output of the auxiliary frequency generator 23.

The internal contents of the PDEOS, the comparator, waiting synchronous generators, a reversible binary counter, a comparison circuit, an element ("dead zone"), a summing binary counter, a level converter, an adder, integrating amplifiers, a differentiating filter and a voltage-current converter are given in the book: P. Horowitz, W. Hill. The art of circuitry. M .: World, t. 1-3, 1993.

Compensation accelerometer works as follows.

Under the action of acceleration on the sensing element 1, an inertial moment arises, under the influence of which a deviation of the sensitive element 1 occurs, which is detected by the angle sensor 2, the input of which is connected to the output of the GON 9. The signal from the angle sensor 2 after amplification by the integrating amplifier 3 is fed to the input of the photodetector 4. Using FDOOS 4 and GON 9, the phase of deviation of the sensitive element 1 is extracted, and at the output of FDOOS 4 the signal will always be in antiphase of the deviation of the sensitive element 1. The signal from the output of FDOOS 4 in the form of voltage and the input of the differentiating filter 5 and then to the input element 6 ( "dead zone"), the voltage at the output of which is zero if the input signal 5 will be within the "zone" input and if more "zones". The output signal from element 6 is fed to the input of the voltage-current converter 7, and then to the input of the adder 8. Differential filter 5 stabilizes the parameters of the compensation accelerometer. The inclusion of an element with an "dead zone" in the analog negative feedback allows a significant increase in the open-loop transmission coefficient. The signal from the output of the FDOOS 4 through the smoothing filter 10 is fed to the input of the additional integrating amplifier 11 and after amplification is fed to the input of the comparator 12. In the comparator 12, the signal from the output of the additional integrating amplifier 11 is compared with the signal of the selected signal, stable in frequency and amplitude, from the output of the auxiliary generator 23. If the signal from the output of the integrating amplifier 11 is greater than the triangular voltage from the output of the auxiliary frequency generator 23, then the output of the comparator 12 will be high logical level, if less, then at the output of the comparator 12 is a low logical level. The signal level from the output of the comparator 12 depends on the phase of the deviation of the sensing element 1.

The signal from the output of the comparator 12 in the form of a level is fed to the input of the level converter 13, and then to the inputs of the waiting synchronous generators 14 and 15, which, using the auxiliary frequency generator 23, give signals in the form of a pulse for each action of the input signal (from the output of the level 13 converter) equal to "1". The reversible binary counter 16, by a signal from the auxiliary frequency generator 23, counts the single pulses coming from the output of the waiting synchronous generator 14, and subtracts the pulses coming from the output of the waiting synchronous generator 15. The reverse binary counter 16 represents the positive information in the direct code, and the negative information in additional code, and the conversion of the additional code is carried out by the comparison circuit 17 and the summing binary counter 18. After a logical comparison of the signals in the circuit compared 17, the signal from the output 17 is fed to the input of the threshold element 19, and then, in the form of a level, to the input of the electronic key 20. The parameters of the electronic key 20 are stabilized by the current generator 21. At the output of the electronic key 20 there will be pulses, the number of which is proportional to the binary code to the input of the comparison circuit 17. The input of the moment sensor 22 receives a signal from the output of the adder 8, one input of which is connected to the output of the electronic switch 20, and the other input - to the output of the voltage-current converter 7. The signal from the output of the adder 8 conductive to the winding torque sensor 22, will be familiar with the sign bit reversing the binary counter 16. Output reversible binary counter 16 is the output of the digital code compensating accelerometer, and the output from the inverter voltage - current 7 - analog output compensating accelerometer.

An introduction to the compensation accelerometer of two negative feedbacks, one negative integrating feedback from the output of the phase detector of negative feedback to one of the adder inputs through series-connected information inputs: a smoothing filter, an additional integrating amplifier, a comparator, a level converter, waiting synchronous generators, and a reverse binary counter, comparison circuit, threshold element, electronic key, other negative feedback from the sensor output The input to the adder through an integrating amplifier, a phase detector of negative feedback, a differentiating filter, an element of the type "dead zone" and a voltage-current converter allows the creation of a compensation accelerometer with astatism in deviation, and the implementation of the self-oscillating mode in negative feedback - expand the bandwidth.

The technical result was checked by modeling a compensation accelerometer, which was carried out in accordance with the structural diagram presented in figure 2, and the simulation results are shown in figure 3, 4. Figure 3 - transient in the compensation accelerometer with a single positive input effect; figure 4 is a transient process in a compensation accelerometer in the absence of an element of the type "dead zone" and integral negative feedback. From the analysis of the simulation it follows that the compensation accelerometer with implemented feedbacks is stable, and in the integrating negative feedback, a relative digital code is implemented proportional to the input action.

Claims (1)

Compensation accelerometer containing a sensing element, the angular position of which is fixed by an angle sensor, an integrating amplifier, a torque sensor, an electronic key, a threshold element, an additional integrating amplifier included in the negative feedback, characterized in that a negative feedback phase detector and an additional negative feedback from the output of the angle sensor to the input of the adder through an integrating amplifier connected in series through the information inputs, f a negative feedback detector, a differentiating filter, a deadband element, a voltage-current converter, and the first negative feedback is formed from the output of the negative feedback phase detector to the adder input through a smoothing filter connected in series to the information inputs, an additional integrating amplifier, comparator, level converter, a couple of waiting synchronous generators, a reversible binary counter, a comparison circuit, a threshold element, electronic the second key, the input of which is connected to the output of the current generator, the second input of the comparison circuit is connected to the output of the summing binary counter, and the additional inputs of the comparator, waiting for synchronous generators, the reversible binary counter and the summing binary counter are connected to the auxiliary frequency generator, additional inputs of the angle sensor, phase the negative feedback detector is connected to the output of the reference voltage generator, and the output of the adder is connected to the input of the torque sensor, the outputs from the reversible binary th and the counter-current voltage of the inverter are respectively digital and analog output compensating accelerometer.

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