SU1053172A1 - Integrating converter - Google Patents

Description

The invention relates to electrical measuring technology and can be used in automatic control and monitoring systems for integrating electric signals of direct and alternating current, including with asymmetric pulse shape. A multielectrode electrochemical converter is known that contains a sealed reservoir filled with electrolyte, in which the input, reading, screening and common electrodes are located. The process of integrating with such a converter reduces to transferring the working substance from one electrode to another by an input electric signal and measuring the time interval from the initial integration to the sudden appearance of potential difference between the electrodes | T}. The main error of this converter is caused by the dependence of electrochemical constant integration on temperature . In addition, the integration time of the input signal is limited (and by the number of the working substance, as well as) and the asymmetric form of the input impulse signals. It is difficult to determine their average value. The closest technical solution to this is to integrate an analog converter that contains two electrochemical an integrator with a common electrode and input and read electrodes, a switching relay and read circuits. In this case, the reading electrodes are connected in series and connected to parallel connected reading circuits, and the input electrodes connected in parallel are connected to the contacts of the relay 23,. The disadvantages of the known converter are the dependence of the integration accuracy on the stability, / j of the integrator parameters, in particular, on the ambient temperature, and the limitation of the integration time range to the minimum and maximum exposure times with a predetermined multiplicity. The aim of the invention is to improve the accuracy of integration and ensure continuity of the integration process. This goal is achieved in that the integrating converter, which contains two electrochemical integrators with a common electrode and input and read electrodes, a read circuit and a relay, introduces a reference current source, a logic unit, a reversible pulse counter and a clock generator, with the input and common electrodes of one the electrochemical integrator through the disconnecting contacts of the relay are connected to the input terminals of the converter and through the closing contacts of the relay to the source of the reference current, and the common and input electrodes are different Wow electroklykichesko--. The integrator is connected via disconnecting contacts of the relay to the reference current source, the reading electrodes of both integrators through the reading circuits and the logic unit being connected to the control input of the reversible counter, the input of which is connected to the clock generator, and the output to the winding of the relay. The drawing shows a structural diagram of an integrated converter. The integrating converter contains the input terminals of the converter 1 and the source 2 of the reference current, which are connected to the input and common electrodes of electrochemical integrators 4 and 5 through the contacts of relay 3. Circuits 6 and 7 are connected to the control input of the reversible counter 9, to the counting input of which a 10 clock pulse generator is connected. The output of the relay 3 is connected to the output of the reversing counter 9.. The operation of the integrating converter is as follows. In storage mode; there is a working substance on all electrodes, and before starting the integration it is necessary to transfer the working substance of the input electrode to the common one. With this purpose, a command of the Setup is set; N09ka zero, according to which the logic block 8 and the reversible counter 9 are set in the zero state, the relay 3 operates and connects the Electrochemical integrator 4 to the reference current source. The integrator 4 is discharged, and at the moment of complete transfer of the working substance from the input electrode to the common one in the readout circuit b, a potential difference arises, in the logic block 8 a pulse is generated. which is fed to the control input of the reversible counter 9 and includes it on addition. In this case, from the generator 10 clock and pulse pulses are fed to the summing - the input of the reversing counter 9, the relay 3 de-energizes, and the integrator 4 prepares. It is connected to the input terminals of the converter 1, the integration process begins, the duration of which is determined by the generator frequency of 10 clock pulses and the capacity of the reversible counter 9. The repeater 5 is connected to the source 2 of the reference current at that time and is discharged, ready for operation. The overflow pulse of the reversible counter 9 triggers a relay.

3, the input terminals of converter 1 are disconnected from integrator 4 and sub. connects to the integrator 5, and the source 2 of the reference current is disconnected from the integrator 5 and connected to the integrator. Toviy 4, the integrator 4 starts the reference current and the charge of the integrator 5 from the input signal. The overflow pulse is also supplied to logic block 8, from whose output a signal is fed to the control input of the reversible counter 9 and it switches to the subtraction of clock pulses. The subtraction time is equal to the addition time. At the instant of the discharge of the integrator 4 by a reference current, a pulse signal is transmitted through the readout circuit b to logic block 8. This signal in logic block 8 generates a pulse of reading the code of the reversible counter 9, which is fed to the output of the converter. The difference of the integration time of the input with the city of ala and the talon current of the integrators 4 with a known value of the reference current and the frequency of the clock pulses is determined by the value of the integral of the input signal.

The integration process of the input signal by the integrator 5 continues. S until the reverse counting counter 9 is cleared. :. Switches to the addition of clock pulses, the integration of the input signal is continued by the integrator V4, and the integrator 5 is discharged by the reference current.

- .. at the moment of the end of the discharge through the read circuit 7 and the logic block 8. A reversible counter 9 is supplied with a com pany of code that is transmitted to the output of the converter. The 1 counter clock 9 continues to sum the clock pulses / and then the process repeats. Thus, information is retrieved from the integrating converter discretely without interrupting the process of inoculation by alternately connecting with an electrochemical integrator

mi The process of integrating the input signal in series with two electrochemical integrators. continue indefinitely.

If it is necessary to pick up information at an arbitrary point in time, the Set Zero command is given, and after the integrator is discharged, the counter current code is read by the reference current.

0

Thus, the integrating converter makes it possible to realize the compensation principle of integrating the input signals, which consists in the fact that the charge of the electrochemical

5, an integrator is produced from an input source for a predetermined integration time, and then the working substance accumulated at the input electrode is transferred to a common electrode (the integrator is discharged

0 by passing a reference current through the electrodes of the opposite polarity compared to the input signal. This allows Nate to the time difference between the input charge cycle

5 by the signal and the discharge cycle by the reference current and thus measure the average value of the input signal and the integral of it.

The input signal can be pulsed with an arbitrary pulse shape, which allows the proposed converter to be used in discrete automatic control systems.

Change in ambient temperature

5 of the medium does not cause an integration error, since a change in the electrochemical constant integration equally affects the integrator charge by the input signal and the discharge of their reference current, and this error is compensated for.

The use of an integrating converter in automatic control systems and, for example, in moving object control systems will improve the quality of control, the accuracy of integration of input electrical signals and; simplifies the coupling of analog sensing elements with digital signals.

0 control computers.

Claims (1)

INTEGRATING CONVERTER, containing two electrochemical integrators * with a common electrode and input and read electrodes, a read circuit of a relay, and with the fact that, in order to increase the reference current, the logic unit, a reversible pulse counter and a clock generator, while the input and common 'electrodes of one electrochemical integrator are connected through the opening contacts / relays to the input terminals of the converter and through the closing contacts of the relay to the reference current source, and the common and input electrode of the other namic integratooa cheoez HAPs roam relay - a reference current source, the readout electrode of both integrators through the read circuits and logic unit connected to the control input of the reversible counter, -SIJ. ,,, 1053172