SU1231572A1 - Two-phase periodic oscillator - Google Patents

Abstract

The invention relates to radio engineering and can be used in automatic control systems for generating electrical power. signals of special shape. The accuracy of setting the phase shift between the output signals is increased. The device contains an amplifier (V) limiting device 1, integrated U 2, potentiometer 3, Y 4 reading, an element with deadband (EZN) 6, inverting Y 7 and summing Y 5, consisting of an operating V 8 and element (E) 9, made in the form of a resistor or EZI. In addition to the main square-wave signals generated at the output of the Y-limiter t, and the triangular shape generated at you during the integrating U 2, is generated at the output of the summed U 5. periodic signal of rectangular shape (if in the feedback circuit At insulating 8 E 9 installed as EZN) or a triangular shape (ee and dissolved in the feedback circuit of the operational Y 8 E 9 installed in the form of a torus resistive GL). This signal is shifted relative to the main at any given angle, within the limits of ± 9CG, regardless of the signal frequency. The goal is achieved by introducing EZN6 and inverting V7.1 Cf ff, 2 ill. l.- / gutf

Description

I

The invention relates to radio engineering and can be used in automatic control systems for generating special shaped electrical signals.

The purpose of the invention is to improve the accuracy of setting the phase shift between the output signals.

FIG. Figure 1 shows a structural electrical circuit for a two-phase generator of periodic oscillations; in fig. 2 - time diagrams that show his work.

The two-phase periodic oscillation generator contains the amplifier-limiter 1, the integrating amplifier 2, potentiometer 3, the subtractive amplifier 4, the summing amplifier 55 element 6 with the dead zone and the inverting amplifier 7, while the total amplifier 5 contains the operational amplifier 8 and element element 9 which is made in the form of a resistor or element with a dead zone.

Two-phase generator periodically-. These oscillations work as follows.

Limiting amplifier 1 and integrating amplifier 2 due to positive and negative feedbacks to amplifier limiting 1 generate voltages of rectangular and triangular shapes respectively (Fig. 2a, b), the frequency of which is determined by the values of the resistor parameters and the capacitor of the integrating amplifier 2. The output signal of the integrating amplifier 2 and the signal taken from the potentiometer 3 are fed to the inputs of the subtracting amplifier 4 (part of the output voltage of the limiting amplifier O. With a single feedback Discount amplifier and a subtractor amplifier 4, a voltage at its output (Fig. 2c) CME schaets relatively integrating the output signal of the amplifier 2, and the amount of displacement depends on the position of the potentiometer 3, and direction,

The displacement depends on

which inputs of the subtracting amplifier 4 are fed from the outputs of the amplifier - limiter 1 and the integrating amplifier 2. When the output signal of the subtracting amplifier 4 exceeds the dead zone of element 6 (i.e., the amplitude of the output voltage of the integrating amplifier

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40

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l 2), a signal appears at the output of the element 6. (Fig. 2d) -., which is fed to the input of the integrating amplifier 7, at the output of which the reverse polarity is doubled (Fig. 2e). The signals from the outputs of the subtractive amplifier 4 and the integrating amplifier 7 are fed to the inputs of the summing amplifier 5. Due to the polarity of these s. Signals, their resulting signal will have a regular triangular shape (Fig. 2e) if in the feedback circuit an op amp 8 is installed element 9, which is made in the form of a resistor. In this case, the phase shift relative to the signal from the code of the integrating amplifier 2 is determined only by the ratio of the magnitude of the signals at the inputs of the subtractive amplifier 4 coming from the outputs

the amplifier limiter 1 and the integrating amplifier 2, i.e. this shift is set by potentiometer 3 and can be set from 0 to 90. The resulting phase shift does not depend on the frequency of the signal. The direction of the phase shift depends on which inputs B1) of Reader Amplifier 4 receives signals (of the same or opposite type). If element 9, which is designed as an element with a dead zone, is installed in the feedback circuit of an operational amplifier 8, then at the output of summing amplifier 5, the voltage will have a rectangular shape (Fig. 2g), whose amplitude is equal to the dead zone of element 9, and the moments of transition through O coincide with the moments of transition through O of the output voltage of the subtracting amplifier 4, due to which the phase of the signal at the output of summing amplifier 5 is also shifted.

Thus, in addition to the main square-shaped signals (output of the amplifier-limiter 1) and a triangular shape (output of the integrating amplifier 2), a two-phase periodic oscillator provides a second periodic signal of a rectangular or triangular shape, shifted relative to the main signal by any given angle within ± 90 °, regardless of the frequency of the signal. A two-phase oscillator has only one integrating amplifier, so it can be easier

frequency tuning and can be made simpler in terms of structural performance, and the phase shift is determined only by the voltage values and does not depend on the frequency (if the inertia of the amplifiers is neglected), which improves the accuracy of the phase shift setting.

Claims (2)

1. Two-phase generator of periodic oscillations containing a successively connected amplifier-limiter and an integrating amplifier, as well as a summing amplifier and a subtracting amplifier, one input of which is connected via a potentiometer to the output of the amplifier-limiter, and another input - to the output integrating. Compiler N. Matvienko Editor T .Parfenova Tehred G.Gerber Proofreader G. Reyetnik -. Order 2658/55 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 2315724 amplifier, characterized in that, in order to improve the accuracy of setting the phase shift between the output signals, the output of the subtracting amplifier is connected directly to one input of the summing amplifier, and to the other input - through an input connected in series with the dead zone - Q. and an inverting amplifier, and the output of the integrating amplifier is connected to the input of the amplifier-limiter. ( 2. The generator according to claim 1, characterized in that the summing amplifier is made on an operational amplifier, the feedback circuit of which includes an element with a dead zone.