SU1686465A1 - Functional converter - Google Patents

Abstract

The invention relates to analog information transducers with pulse-width modulation and can be used in the automation of technological processes. The purpose of the invention is to improve the accuracy of work when implementing the functional relationship X2 Y, B converter-x2 transducer d BANNER 1, adder 2, integrator 3 , relay element 4, counting trigger 5, input 6 and output 7 The required function is realized by periodically connecting the control voltage to the input of the adder 2 2 or

Description

The invention relates to computing technology, namely to devices with pulse-width modulation, and can be used in automatic process control systems.

The purpose of the invention is to improve the accuracy of work when implementing the functional X2 dependence of Y

K-X2

The functional transducer circuit is shown in FIG. time diagrams of the converter operation - in FIG. 2

The functional converter contains the BANCH 1 element, the algebraic adder 2, the integrator 3, the relay element 4, the trigger 5, the input 6 of the control voltage setting and the output 7. The control voltage is applied to the information input of the BAN 1 element that is connected to the adder 2 The presence of O at the control input of element 1 prevents the signal from passing to the input of the adder.

2, the output of which is the difference of the signals from the outputs of elements 1 and 4. The output signal of the adder 2 acts on the input of the integrator 3, which realizes the transfer function W (p) °

t- Reamer sweep

I and p

from the output of the integrator 3 is fed to the input of the relay element 4 Relay element 4 has switching thresholds that are symmetrical with respect to O and the inverting hysteresis loop Trigger 5 is clocked by the leading edge of the input polarity of the positive polarity

In Fig. 2, ± B is the switching thresholds of the relay element 4;

± A - the amplitude of the pulses at the output of the element 4 and the trigger 5,

knots (t.) - the output signal of the integrator 3;

(t) is the output signal of the relay element 4;

J

About 00 About t ± About SL

ys (t) is the output signal of the trigger 5;

 XBX - input signal.

Functional Converter works as follows.

If trigger 5 is in the - A state (see Fig. 2, c), then element 1 is closed, and the output signal of the converter does not pass to the input of adder 2. Elements 2-4 operate in stable self-oscillations. The output signal of the integrator 3 has a sawtooth shape and amplitude, limited at the level of the switching thresholds of the relay element 4 (see Fig. 2, a). After the end of the full period of self-oscillations (see Fig. 2, a), the trigger 5 switches to the + A state (see Fig. 2, c). Element 1 goes to the open state, and the input signal (see Fig. 2, b) is fed to adder 2. In this case, the derivative of the output signal of integrator 3 depends on the voltage level at input 6. In one of the half-cycles of the development transform the rate of change of the sweep is determined by the difference of the signals at the inputs of adder 2, and in the subsequent cycle - by the sum of these effects. After the period of self-oscillations, the trigger 5 again returns to the state - A (see Fig. 2, c), and the next conversion cycle independent of the input signal begins.

Useful component of output pulses

YO A-o2 / (2-o2) (1)

“/ Xvh / A / is the normalized value of the control signal, with 0 a 1.

Thus, the implementation of the functional dependence of the form (1) in the proposed device is achieved by including the element BANGE, which eliminates the use of approximation units and improves the accuracy of the functional converter.

Claims (1)

Claims of the Invention STI Y K-Hg an element is entered into it The BAN, the output of which is connected to the second input of the adder, the information input of the BAN element is connected to the input of the control voltage setting, and the control input is connected to the trigger output. Phage 2