SU934497A1 - Sinusoidal voltage generator - Google Patents

Description

The invention relates to analog computing and can be used to produce stable amplitude sinusoidal voltages with small non-linear distortions.

A known generator of sinusoidal oscillation, containing an oscillating element, is a quadrant, a comparator, a relay, by means of whose contacts the amplitude of oscillation 1 is corrected.

An electronic generator is also known, which contains an oscillatory link and a non-linear element that periodically switches the circuits of positive and negative feedback in the oscillatory link 2.

A disadvantage of the known generators is a significant non-linear distortion of the output signal.

The purpose of the invention is to reduce the nonlinear distortion of the output signal while stabilizing the amplitude.

This goal is achieved by the fact that a sinusoidal voltage generator containing, in series, a summing amplifier, a first and a second integrator, the output of the first integrator being connected

through the key with the first inverting input of the summing amplifier, and through the second key with the non-inverting input of the summing amplifier, and the output of the second integrator is connected to the second inverting input of the summing amplifier, contains four comparators, the element OR NOT and the element AND, the output of the first

10 of the integrator is connected to the first inputs of the first and second comparators, the outputs of which are combined and connected to the first inputs of the OR-NOT and AND elements, the output of the second integrator 15 is connected to the first inputs of the third and fourth comparators, the outputs of which are combined and connected to the second inputs of the OR- elements NOT and AND, the output of the element OR-IS is connected

20 with the control input of the first key, the output of the element I is connected to the control input of the second key, the second inputs of the first and third comparators are connected to a source of negative reference voltage, and the second inputs of the second and fourth comparators are connected to a source of positive reference voltage.

FIG. Figure 1 shows the generatoral homa 30; in fig. 2 - time diagrams of voltage at the outputs of the blocks,

The generator contains a summing amplifier 1, integrators 2 and 3, comparators 4 7 / keys 8 and 9, element OR-NOT 10, element 11. The positions of the sources of the reference voltage are indicated by position 5 and 12 о.

FIG. 1 amplifier 1 and integrators 2 and 3 are shown in the typical implementation: operative amplifiers Yu 14 - 16, integrating capacitors 17 and 18, scaling resistors 19 - 25.

The generator works as follows. item 15

With the excitation of oscillations / when x amplitude is less than the reference level / outputs of the comparators 4-7 is removed; mc low level signals corresponding to a logical zero. These signals-20s, having passed through the element-OR-NOT 10, close the key 8 in the positive fraternal bond circuit, as a result of which the amplitude of oscillations rapidly increases. At the moment when it reaches the reference level at the outputs of the comparators 4-7, periodically at the moments corresponding to the excess of the reference level by the amplitude, high-level signals appear (logical unit), then it decreases the amplification rate, and when the amplitude reaches the level of 1.41 from 0 (, p, on the combined outputs of the comparators, the direct signals with double frequency and SCW are important for equal 2, which through the element OR-NE 10 disconnect the positive feedback circuit. As a result, oscillation stops. 0

If for some reason the oscillation amplitude exceeds the stationary value, then the borehole frequency of the double frequency becomes greater than 2, the output signal of the element 11 And 11 appears, which with the help of key 9 includes a negative feedback circuit, which leads to a decrease in amplitude fluctuations to a stationary level and its stabilization. 50

In the stationary mode, the keys B and 9 are closed, therefore, the oscillations are almost sinusoidal, the nonlinear distortion coefficient of the output voltage is mainly55 determined only by the nonlinear distortions of the integrators, which can be made negligible.

Such a circuit solution provides an acceleration of transients, and, consequently, labor productivity, 4Td also determines the technical and economic effect of using the invention.

A sinusoidal voltage generator containing a summing amplifier sequentially connected, the first and second integrators. Moreover, the output of the first integrator is connected via the first switch to the first inverting input of the sum E) unl its amplifier, and through the second switch to the non-inverting input of the summing amplifier voltage, the output of the second integrator is connected to the second inverting input of the summing amplifier, so that nonlinear distortion of the output signal when the amplitude is stabilized, it contains four comparators, the element OR NOT and the element AND, the output of the first integrator is connected to the first inputs of the first and second comparators, output The ports of which are combined and connected to the first inputs of the elements OR-NOT and AND, the output of the second integrator is connected to the first inputs of the third and fourth comparators, the outputs of which are combined and connected to the second inputs of the elements OR-NOT and AND, the output of the element OR-NOT connected to the control The first input of the key, the output of the element I is connected to the control input of the second key, in the first inputs of the first and third comparators are connected to a negative reference voltage source, and the second inputs of the second and fourth comparators are connected to the source zhitelnogo reference voltage.

Sources of information accepted -Or attention in the examination

1.Tetelbaum I.M., Schneider Yu.R. 400 circuits for AVM. M., Energie, 1978, p. 100.

2. Authors certificate of the USSR 132677, cl. H 03 V 3/02, 1960 (prototype).

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Claims (1)

Claim A sinusoidal voltage generator containing series-connected summing amplifier, first and second integrators, Moreover, the output of the first integrator is connected through the first key to the first inverting input of the summing amplifier, ^ and through the second key with a non-inverting input, the amplifier is added, the output of the second integrator is connected to the second inverting input of the summing amplifier amplifier, characterized in that, in order to reduce the nonlinear distortion of the output signal while stabilizing the amplitude, it contains four comp arator, an ILC — NOT element, and an I element, the output of the first integrator is connected to the first inputs of the first and second co-actuators, the outputs of which are combined and connected to the first inputs of the OR-NOT and I elements, the output of the second integrator is connected to the first inputs of the third and fourth comparators, outputs which are combined and connected to the second inputs of the OR-NOT and AND elements, the output of the OR-NOT element is connected to the control input of the first key, the output of the AND element is connected to the control input of the second key, the second inputs of the first and third comparators are connected to a source of negative reference voltage, and the second inputs of the second and fourth comparators are connected to a source of positive reference voltage.