SU1327131A1 - Function generator - Google Patents

Abstract

The invention relates to electronic analog devices, designed to generate electrical signals of predetermined forms and can be used in automatic control systems. The aim of the invention is to expand the functionality by implementing damped / increasing modes of a given shape with an adjustable damping decrement. Two sampling-storage units 9 and 10, a scaling unit 11, element 6 and a second relay hysteresis element 14 are introduced into the functional generator. The essence of the invention is that the change in the amplitude of oscillations produced by the functional generator is carried out by changing the control signal to the control inputs of the relay hysteresis elements 3, 14 and the input of the reference signal of the functional converter, and the generation of this control signal is automatically generated. the system containing the sampling-storage units and the scaling unit 11, at the moments of transition through the zero of the triangular signal .. 2 Il. with (L

Description

The invention relates to electronic analog devices intended for performing electrical signals of predetermined forms and can be used in automatic control systems and in test equipment.

The purpose of the invention is to expand the functionality due to the implementation of damped / increasing modes of a given shape with an adjustable damping factor.

Fig. 1 is a block diagram of a function generator; Fig. 2 shows timing diagrams of voltages of a functional generator.

The functional generator includes a frequency control unit 1, an integrator 2, a first relay hysteresis element 3, a functional converter 4, a comparator 5, element 6, the input 7 of the generator reference voltage, switch 8, first 9 and second 10 sampling-storage units, scaling unit 11, input 12 setting the value of the damping / ramping down of the generator output signals, inverter 13, second relay hysteresis element 14.

. A feature of AND 6 is the appearance of a signal at its output, both when the positive and the negative signals at its inputs coincide, which is easily realized using both non-inverting and inverting inputs of the operational amplifier.

Comparator 5 must invert the signal and also change the sign of the output signal when the sign of the input signal changes.

Functional transducer 4 must provide a signal of a given shape at its output regardless of the scale of the input signal or when the reference signal changes in accordance with the change of the scale of the input signal.

The function generator works in the following way.

1) Switch 8 is set to the position connecting the reference voltage input 7 with the signal input of the first sampling-storage unit 9. In this case, a continuous oscillation mode is realized.

The output of the first block 9 sample storage and the output of the inverter 13

five

0

five

0

five

0

five

0

consequently, at both inputs, the threshold values of both relay hysteresis elements 3 and 14 of the voltage are constant and equal in magnitude to the reference signal.

Therefore, the value of the output signal of the first relay hysteresis element 3 is constant and equal to the value of the reference signal, and the sign changes when the output voltage of the integrator 2 reaches a value equal to the output voltage of the first relay hysteresis element 3, under the action of which the output voltage of the integrator changes 2. Thus, the regime of periodic oscillations is realized. Triangular-shaped oscillations from the output of integrator 2 are transformed by functional converter 4 into oscillations of a given shape (for example, sinosoidal), and by comparator 5 - into oscillations of a rectangular shape with an amplitude bounded by the second relay hysteresis element 14.

The amplitude of oscillations at all outputs of the functional generator is constant and equal in magnitude to the reference signal. The pulses from the output of the element 6 are alternately switched by the sampling-storage units 9 and 10 from the tracking mode to the storage mode. When the first sampling-storage unit 9 operates in tracking mode and the signal of the source of the reference signal is recorded in it, the second sampling-storage unit 10 operates in the storage mode and saves the previous signal value, which was at the output of the first sampling-storage unit 9 in the preceding switching cycle. Since in the mode of continuous oscillations the magnitude of the signal arriving at the signal input of the first sample-storage unit 9 is constant and equal to U, then both at its output and at the output of the second sampling-storage unit 10, the magnitude of the signal is constant and equal to, at the output of the unit 11 scaling the signal value is also constant and equal to "K Upn,

where K, 1 (coefficient 5

 one-(

transmission block scaling block 11).

2) Switch 8 is switched to the position connecting the output of scaling unit 11 to the signal input of the first sample-storage unit 9.

313

In this case, the mode of attenuation (increasing) oscillations.

The operation of the circuit is similar to that described, except that the signal of the source of the reference signal is no longer a constant signal, but a decreasing (increasing) signal from the output of scaling unit 11.

Consider the mode of damped oscillations. In this case, the input ratio 12 (12) sets the transfer coefficient (K 1) at the input 12, specifying the magnitude of the decrement / increase ratio of the generator output signals.

Let switch 8 be transferred from a continuous oscillation mode to a damped oscillation mode at the moment

t time

h

As can be seen from the diagram U (t), at the output of the element And 6 there is no signal. Consequently, the first sampling-storage unit 9 is operating at this moment in the storage mode and at its output the signal Uj Ujf,.

The second sampling-storage unit 10 operates in tracking mode and the signal at its output is equal to U, i.e. U | Q Uj Upp. The signal at the output of the block on May 11 is the stacking of the Q ' and Uj. The damping of the oscillations begins in the circuit from the moment tj into which the triangular signal at the output of the integrator 2 passes through zero. The first sampling-storage unit 9 goes into tracking mode and at its output a signal Uj and K ,, Uon appears.

The second sampling-storage unit 10 goes into storage mode and at its output remains the signal

At time tj, when the triangular voltage at the output of the integrator 2 reaches a value equal to the output voltage of the first relay hysteresis element 3, the signal at the output of the element And 6 is zero.

The first sampling-storage unit 9 goes into storage mode and the voltage Uj remains at its output, and the second sampling-storage unit 10 goes into tracking mode and the voltage U appears at its output. The next switching of the operating modes of both sampling units storage 9 and 10 occurs at time t when the integrator output voltage passes through zero. At the same time on the way out

one . .4 Yes, the first sampling-storage unit 9 appears voltage U K, U

Further, the cycle of switching the operation modes of the sampling-storage units is repeated. At the same time, the voltage U, at the output of the first sampling-storage unit, changes in steps at the moments of transition through zero of the output voltage Uj, j of the integrator 2, remaining constant during the half-period of variation of this voltage.

The voltage Uj during the n-th half period, counting from the moment tj on the beginning of the attenuation mode, is equal to

u; ,,

(one)

five

about ,

about

g

Q g

, The voltage Uj directly and 0 through the inverter 13 is fed to the second inputs of setting the threshold values of both burdock hysteresis elements, as well as to the input of setting the initial value of the function converter 4. As a result, the voltage at the first 11, third and fourth V outputs of the function generator is represented These are triangular, sinusoidal (or other specified shapes) and rectangular oscillations, respectively, the amplitude of which in each half-period is determined by formula (1).

If we denote the damping decrement D - the ratio of the amplitudes of two adjacent half-periods of the same sign, then D K and its value can be set by changing K, as the control signal changes.

At K 1, the oscillations will increase. In the proposed scheme of a functional generator, a damped-increasing oscillation mode with automatic multiple mode switching can be easily implemented. When the voltage Uj reaches the desired maximum and minimum values. At the same time it is necessary to automatically switch the value of K from to K, 1 and back. The voltage Uj, at the second output of the functional generator, also decays, but its shape is not rectangular, as in the mode of continuous oscillations.

Thus, the functional capabilities of the functional generator are extended by implementing damping modes of oscillations of a given shape with

with adjustable damping decrement.

Claims (1)

Invention Formula five A functional generator containing a serially connected frequency control unit, an integrator and a first relay hysteresis element whose output is the output O of the rectangular voltage of the generator and connected to the input of the frequency control unit, the output of the integrator is the output of the triangular voltage of the generator and connected to input 5 a function converter, the output of which is the output of the functionally varying voltage of the generator, inverter and switch, the output of the comparator and the first input of the element I, the second input of which is connected to the auxiliary output of the first relay hysteresis element, the output of the element I is connected to the control inputs of the first and second sampling storage units, the output of the scaling unit is connected to the second input of the switch connected to the information output the input of the first sampling-storage unit connected by the output to the first inputs of setting the threshold values of the first and second relay hysteresis elements; the input of setting the initial value audio transducer and functional inverter input connected to the second inputs of the output specifying threshold values of the first and second. the first input of which is connected to the on-20 relay hystereic elements, producing a generator reference voltage, characterized in that, in order to expand the functionality by implementing damped / increasing modes of a given shape with an adjustable damping factor, two series-connected blocks are inserted into it sample storage, a scaling unit, a comparator, an AND element, and a second relay hysteresis element, median information input with the output of the comparator and the first input of the element I, the second input of which is connected to the auxiliary output of the first relay hysteresis element, the output of the element I is connected to the control inputs of the first and second sampling storage units, the output of the scaling unit is connected to the second input of the switch connected to the information output the input of the first sampling-storage unit connected by the output to the first inputs of setting the threshold values of the first and second relay hysteresis elements; the input of setting the initial value audio transducer and functional inverter input connected to the second inputs of the output specifying threshold values of the first and second. the stroke of the second sampling-storage unit is connected to the information input of the scaling unit, the transmission gain control input of which is connected to the input of setting the magnitude of the attenuation / ramp up of the generator output signals, the output of the secondary relay hysteresis element is connected to the auxiliary output of the rectangular generator voltage, the integrator output is connected to the input of the comparator. 9blXj 1d / DG; FAR (Jbblxlt II 1 I nIII I I t I ItI I I I I I I 1 I1II I I I I I I I M I I I III innnnann i i II n I I i I I Compiled by N. Zaitsev Editor M. Bandura Tehred V. Kadar Order 3393/47 Edition 672 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, city. Uzhgorod, st. Project, 4 FIG. 2 Corrector S. .Cherni