SU363987A1 - DEVICE FOR MODELING THE FUNCTION ZX " - Google Patents

Description

one

The invention relates to the field of computer technology and can be used in systems of automatic control, regulation and control of various processes.

Multiplying-dividing devices are known, which contain functional converters of input voltages to periodic sequences of unipolar sinusoidal pulses, a comparison circuit of the transformed voltage, an electronic key unlocked by the output signal of the comparison circuit, and a smoothing filter.

However, such devices have limited functional capabilities, since with their help it is possible to simulate the considered function only with a single value of the exponent.

The purpose of the invention is to ensure the possibility of; X;

positive numerical values of p.

This is achieved by the fact that each of the functional converters is made in the form of a resistor connected to a capacitor, and a transistor connected in parallel to the capacitor.

In order to eliminate the error due to the frequency instability of the pulse generator, the device additionally contains a third

functional converter, electronic key, second smoothing filter and logic “NOT.

Figure 1 shows a block diagram of the device.

The device consists of functional converters 1 and 2, a generator of 3 pulses, a comparison circuit 4, an electronic switch 5 and a smoothing filter 6. Instrument V

they are connected to the converter input /, and the voltage Z is connected to the input of converter 2; ) 1e the inputs of both converters are connected to the output of the geierator 3 pulses, the output of the converter / - with one m from

the inputs of circuit 4 are compared, the output of converter 2 via electronic key 5 is with the input of the smoothing filter 6, and the control input of key 5 is with the output of comparison circuit 4.

Each of the functional converters 1 2 is a series connection of a resistor with a capacitor connected in parallel to the transistor. Jerehsd base-emitter transistor is

the trigger input of the converter, and the resistor terminals - the output terminals of the converter. In converter 1, the resistor is polypropylene as a variable resistance. To eliminate errors introduced by

the instability of the frequency of the generator 3 pulses, the device additionally contains a functional converter 7, similar to the converter m / and 2, the electronic key 8, the logic circuit "NOT 9 and the smoothing filter 10. The device operates as follows. The output rectangular pulses from the generator 3, acting on the triggering inputs of the functional converters I and 2, saturate the transistors of these converters. In this case, the capacitors are discharged through very small resistances of the open transistors and at the outputs of the converters / and .2 The voltages are set equal to Y and Z, respectively. At the end of each pulse, the transistors of the functional converters lock again, starting the process of charging the capacitors and The outputs at the outputs of the functional converters / and 2 are decreasing according to the law of the exponent. Thus, during the action of the triggering pulse, the voltage at the output of the functional converter / is equal to K, and during the pause, according to Law, the voltage at the output of the functional converter 2 during the action of the triggering pulse is equal to Z, and during the time of the Jam. But according to the law Ze t, the Time Constant g of converter 2 is chosen such that the acceleration of its output at the end of each pause with sufficient accuracy can be considered equal to zero. The time constant of the converter / differs n times from the actual time of converter 2. The output voltage of the converter is compared with the voltage X using the comparison circuit 4. At the output of this comparison circuit in each transformation period, in the time interval when X becomes larger than the output voltage of the converter /, a pulse appears that unlocks the electronic key 5. At the same time, the opened key passes through itself to the Input of the smoothing filter 6 output voltage the functional converter 2. the constant component of the pulse sequence at the output of the key 5, selected using the smoothing filter m 6, is equal to the change in the value of the exponent is carried out by changing the constant time function transducer / with variable resistance. In the particular case of performing the multiplier .A ... constant wreno-delptelnon converter operation / make equal to the constant time of the converter 2. In order to eliminate the error from the frequency instability of the generator 3 pulses, the voltage G should be connected to: the input of the additional functional converter 7, the time constant of which is also equal to t and which is also triggered by rectangular pulses of the generator 3. An electronic key 8 locked by the pulses of the generator inverted by logical During the generator pauses, the output voltage of the converter 7 to the input of the smoothing filter 10. The voltage and output of the electronic key 8 is a periodic sequence of exponential pulses, the constant component of which is selected by the smoothing filter 10, is rj ; U. It is connected to the converter input / instead of voltage K. Obviously, in this case the voltage at the output of the device does not depend on the period T of the converter. The subject of the invention 1. A device for modeling a function (Zr containing two functional converters, a pulse generator connected to the inputs of converters, a comparison circuit whose input is connected to the output of the first functional converter, and an electronic key connected to the output of the second functional converter, output of a comparison and the input of the first smoothing filter, differing in terms of that, in order to simulate the function at any positive values of the exponent, each functional The transducer is made in the form of a resistor connected to a capacitor and a transistor connected in parallel to the capacitor 2. The device according to claim 1, characterized in that, in order to eliminate the error from the frequency instability of the pulse generator, it additionally contains a functional converter, electronic key and the second smoothing filter, connected in series, as well as the logic circuit "NOT, the output of which is connected to the input of the electronic key, while the inputs of the third functional converter and logical tion scheme "is not connected to the pulse generator, and the output of the second smoothing filter connected to the first functional vhodo.m transducer.

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