SU935978A1 - Sinusoidal oscillation generator - Google Patents

Description

(5) GENERATOR OF SINUSOIDAL OSCILLATIONS

one

The invention relates to automation, can be used in the creation of automatic control systems, control systems, automatic control systems and the study of their dynamic characteristics. The most preferred application for this type of generator is low and infra-low frequencies.

Generators of sinusoidal oscillations are known that contain RC generators with a relay control element.

The closest to the invention in technical essence is a generator comprising two integrator units, amplifiers, two quadrs connected to the integrators, a multiplication unit, adders and potentiometers 23.

In this generator, if there are tolerances on the gain and the time constant of the integrators, the transient process deteriorates and the oscillation shape changes.

The aim of the invention is to improve the accuracy and simplify the tuning by providing separate and independent adjustment of the frequency, amplitude of oscillation and phase.

To achieve the goal, a generator of sinusoidal oscillations, containing two successively connected integrators, the first amplifier connected in series, and the alternating unit

10 coefficient, the output of which is connected to the first input of the first integrator, an adder, whose inputs through the second and third amplifiers are connected respectively to the outputs of the first and

15 of the second integrator, and the output is connected to the first input of the nonlinear driver of the switching function, the second input of which is connected to the output of the second integrator, which is the output of the generator, and the third input is the control input of the generator, two blocks are introduced with a discretely variable transfer coefficient , the first block with a discretely variable transfer ratio is connected between the output of the second integrator and the input of the first amplifier, and the second is connected to the output of the adder, and the output to the second input of the first the integrator, the first control input of the first block with a discretely variable transmission coefficient and the control input of the second block with a discretely variable transmission coefficient are connected to the output of the nonlinear driver of the switching function, the second and third control inputs of the first block with a discretely variable transmission coefficient are connected respectively to the outputs of the adder and the second integrator, a third block is also introduced with a discretely variable transfer coefficient, the input of which is connected to the output of a nonlinear form Ov t switch function, output is connected to the third input of the first integrator, a. a control input is associated with an adder output.

FIG. 1 shows a block diagram of a sinusoidal oscillator; in fig. 2 and 3 schedules of the generator; in fig. + -6 - block diagrams with discretely variable transmission coefficient.

The sinusoidal oscillation generator (Fig. 1) contains integrators 1 and 2, a nonlinear driver switching function 3 (FFP), containing two quadrants 4 and 5 of the output signal and its derivative, respectively, amplifier 6, potentiometer 7 for controlling the oscillation frequency, adder 8 and second potentiometer 9 for adjusting the amplitude of sinusoidal oscillations, amplifier 10 blocks P and 12 with a discretely variable gain, amplifiers 13 and connected to the input of the smmator 15, the output of which is connected to the third block 16 with discretely changing m transfer coefficient and block I7 variable coefficient, controlled synchronously with the potentiometer 7.

The output of the block 12 through the amplifier 10 and the block 17 of the variable coefficient and the outputs of the blocks 11 and 12 with a discretely variable gain are connected to the corresponding inputs of the integrator 1.

The block 11 with a discretely variable transfer coefficient contains a yenlitel 18 with a gain factor k, an inverter 19 (with a gain factor of 1), and a polarized relay 20. If the signal x fed to the control input of the relay 20 is greater than zero, then the output of block 11 the output of amplifier 18 is connected, if x is less than zero, then the output of block 11 is connected to the output of inverter 19, block 12 with discretely variable transmission coefficient (fig. 5) consists of amplifier 21, relay 22-25, the input of amplifier 21 is the signal input of block 12 and the inputs of the relay 23-25 are control inputs and block 12.

The signals d, x, x, arriving at the control inputs of block 12, change the state of relay 23-25. When current arrives at the relay 22, the output of the unit 22 is connected to the output of the amplifier 21 with a gain factor ky. When the relay 22 is de-energized, the output of the unit 12 is connected, the output of the amplifier 21 with the gain factor ky. .

Unit 16 with a discretely derived transfer coefficient (FIG. 6) contains an amplifier 26 with coefficients

ki and polarized

gain

Ha relay 27.

If the signal d, coming to the control input of the relay 27 is greater than zero, then the output of the amplifier 26 with a gain factor kjv is connected to the output of the converter, if the signal g is less than zero, then the output of the amplifier 26 is connected with the gain factor.

The generator works as follows.

Claims (2)

The input of the potentiometer 9 of the switch function generator 3 (FPP) is given a signal equal to A from the constant voltage source. With the help of potentiometer 9, the required amplitude of the output signal x of integrator 2 is set, and with the help of a block of variable coefficient 17 and potentiometer 7, the required frequency of sinusoidal oscillations and the corresponding gain factor in the nonlinear converter circuit 12 are set. At a transition from one mode (it), A ) to another signal y and X at the output of integrator OES 1 and 2 have arbitrary initial values, with the result. To ensure that g 0 arrives and the gl mode exists on g O, it is necessary that the .1 1,; 2 and 16 blocks with discretely variable transmission coefficients change the gain factors in accordance with the signs of the signals g, x, x. When combining signs g, x, x more than zero, a circuit with a gain factor k is connected to the input of integrator 1, and when combining signs g, x, x less zero, a circuit with a gain factor C is connected, and lo 16 is a discretely variable transmission coefficient. changes the gain factor k. At 9 °, a circuit is connected to the input of integrator 1 with a gain factor of k. and when connected a circuit with a gain factor k. Accordingly, block 11 changes the gain factor kq. . When x-O, a circuit with a gain factor ko is connected to the input of integrator 1, and when a circuit is connected with a factor. Simulation of the generator's workers under the control law (E) on the computer is carried out at T 1,2. 30 s. {dT - ,, 1); and a-i. 1 (120%); k. 0.033; 0, k -0.39 kyl, -0, w 0.5 A 10. Ha fig. 2 shows a graph of the transition process at k 0.1, and FIG. 3 at k (v 1. As can be seen from the graphs with an increase in the coefficient of amplification ka. The time for setting g O decreases. In particular, if the change in the set oscillation frequency is performed at X x O, then the transition time to the new mode is zero, since In this case, the nonlinear converter of the switching function can be excluded from the generator circuit. The resulting generator circuit is distinguished by separate and independent control of the frequency, amplitude of oscillations and phase. The frequency is regulated using a potentiometer 7 and a transducer block of amplitude coefficient 7 amplitude - using a potentiometer 9, phase - setting the initial conditions of integrators 1 and 2. When the set frequency decreases, neither amplitude nor oscillation shape changes. The lower frequency limit is almost unlimited (down to zero). The upper frequency limit is determined The maximum possible gain of the amplifiers. The construction of a generator of sinusoidal oscillations with a variable structure makes it possible to compensate for tolerances on the parameters of integrators, to improve the quality of the transient process. 1. Generator of sinusoidal oscillations, containing two serially connected integrators, serially connected first amplifier and variable coefficient unit, the output of which is connected to the first input of the first integrator, an adder, whose inputs through the second and third amplifiers are connected respectively to the outputs of the first and second integrators, and the output is connected to the first input of the non-linear shaper of the switching function, the second input is co-. The second input is connected to the output of the second integrator, which is the generator output, and the third input is the control input of the generator, which is intended to increase the accuracy and simplify the tuning by providing separate and independent adjustment of the frequency, amplitude of oscillations and phases, two blocks with a discretely variable transmission coefficient are entered into it, the first block with a discretely changing transmission coefficient being connected between the output of the second integrator and the input of the first amplifier, and the second is connected to the input the output of the adder and the output to the second input of the first integrator, the first control input of the first block with a discretely variable transmission coefficient and the control input of the second block with a discretely variable transmission coefficient are connected to the output of the nonlinear shaper of the switching function, the second and third control inputs the first block with a discretely variable transmission coefficient is connected respectively to the outputs of the adder and the second integrator. 2. The generator according to claim 1, wherein a third block with a discretely variable transfer coefficient is inputted into it, the input of which is connected to the output of the non-linear driver of the switching function, the output is connected to the third input of the first integrator, and the control input is connected output adder. Sources of infirmation taken into account during the examination t. Vavilov A.A., Solodovnikov A.I. Electronic infra-low generator frequencies with relay control element. - Izv. universities. Ser. Instrumentation, 1962, № 4. 2, Boichuk L.P. The method of structural synthesis of nonlinear automatic control systems. M., Energie, 1971, p. 68 (prototype). spli 7 u