SU1640669A1 - Correcting device - Google Patents

Abstract

The invention relates to automation and computing devices and can be used in the design of automation devices and digital-analog tracking systems whose input receives a control signal from the output of a digital-to-analog converter in the form of a step voltage at a constant frequency of digital information, for example, digital to analogue tracking systems, closed in a corner, controlling the constant speed of rotation of the load. The purpose of the invention is to improve the accuracy of the device. To achieve the specified circuit, a correction device containing an inertial link, the input of which is connected to the input of the device’s step signal, a clock frequency input and a differential amplifier, is additionally entered an adder, the first input of which is connected to the output of the inertial link, the second input is connected to the output the differential amplifier, and the output of the adder - with the output of the device; the first and second control keys, the control inputs of which are connected to the clock output through a control device; first and second memory elements. Moreover, the switching contact of the first key is connected to the input of the step signal, its normally closed contact is connected to the normally open contact of the second key through the first memory element, and the normally open contact of the first key is connected to the normally closed contact of the second key The switching contact of which is connected to the first input of the differential amplifier, the second input of which is connected to the input of the device’s stepped signal. At the same time, the gain of the differential amplifier is equal to K 1 - G r ee 1 - Ј is the constant of the time of the inertial link; T - period of the clock frequency of the change of information. 3 il. with S (L 05 4 O O O5 x

Description

The invention relates to automation and computing devices and can be used in the design of automation devices.

and digital-analogue tracking systems, to the input of which a control signal is output from the output of the digital-to-analogue converter in the form of a stepwise,

linearly varying voltage at a constant frequency of changing information, for example, in digital-analogue tracking systems, closed in angle, controlling a constant speed of rotation of the load.

The purpose of the invention is to improve the accuracy of the device.

Figure 1 presents the structural diagram of the proposed correction device; Fig. 2 shows timing diagrams for the operation of the device; in fig. 3 is a circuit diagram of the device.

The device contains an inertial link 1, an adder 2, a first control key 3, a first 4 and a second 5 memory elements, a second control key 6, a differential amplifier 7 and a driver of control pulses 8, a 9-step input, a 10 clock input, output 11 of the device.

The input 9 of the device's step signal is connected via the inertial link 1 to the first input of the adder 2, the second input of which is connected to the output of the differential amplifier 7, and the output is connected to the output 1 of the device. The input 9 of the step signal is simultaneously connected to the second input of the differential amplifier 7 and to the switching contact of the first key 3, the opening contact of which is connected to the first memory element 4. the closing contact of the second key 6, and the closing contact of the first key 3 through the second memory element 5 is connected to the break contact of the second key 6, the switching contact of which is connected to the first input of the differential amplifier 7, while the control inputs of both keys through the driver 8 connect - Yen with an input of 10 clock frequency of the device.

The principle of operation of the proposed correction device is filtering with the help of an inertial disturbance link in a linearly varying step signal, which is the algebraic sum of two signals: the desired signal and the disturbance signal, and the subsequent full compensation of the delay of the useful signal by adding to the smoothed output signal the inertial component of the compensating signal,

proportional to the increment of steps per clock.

The device works as follows.

From the source of the step signal to the input 10 of the clock frequency of the device, clock pulses are received, and the input of the 9 step signal is a linearly varying step signal, the level of which changes when the short-term pulse of the clock frequency appears at the input 10. This level of the step is kept at the input 9 during the beat.

The step signal from input 9 is simultaneously fed to the input of the inertial link 1, to the first input of the differential amplifier 7 and to the switching contact of the first key 3. At the output of the inertial link, a smoothed signal is produced, having a delay, the interference in which will be suppressed (Fig. 2a). The interference suppression factor and the delay introduced by the inertial link into the useful signal are determined by the constant time of the inertial link p and the period of the contact frequency T. The magnitude of the delay U zap of the useful signal is proportional to the step increment per step and is determined by the ratio

one

1 - e

4t

Lee,

where is the magnitude by which the signal at the output of the inertial element lags in amplitude;

& U - step signal increment per step c - constant of the inertial link time; T is the period of the clock frequency. A compensation signal equal to Uwf) is generated as follows.

During the previous clock cycle, the driver 8, which receives clock pulses from the input 10 of the device, gave a signal to the control inputs of keys 3 and 6, which set the latter in the opposite state to that shown in Fig. 1. In this case, the memory element 5 remembered the level of the step signal, having existed5164

at the input 9 during the previous clock cycle.

In the current clock, the driver 8 generates another output level, which sets the keys 3 and 6 to the positions shown in Fig. I. The current stepped signal from the device input 9 through the opening contact of the key 3 is fed to the input of the memory element 4 and is remembered at its output. The signal from the output of the memory element 5, which has a step level that existed during the previous cycle, through the opening contact, key 6 is fed to the second input of the differential amplifier 7, and the current value of the step goes to the first input. The differential amplifier 7, by subtracting its previous value from the current value of the step, produces a step increment signal per clock and amplifies this signal by a factor of K,

one -

image on its output signal compensation, equal in magnitude to the signal, on. which is reduced the amplitude of the useful signal at the output of the inertial element 1.

The compensating signal from the output of the differential amplifier 7 is fed to the second input of the adder 2, where it is summed with the output signal of the inertial link 1 received at the first input of the adder. The total signal from the output of the adder 2 is fed to the output 11 of the device. Thus, the output signal of the device (FIG. 2 c) is linear, repeating the useful

Q 5 0

50

five

0

The component of the step signal is at the input and has no delay. Interference due to the j gradation of the input signal is suppressed in it to an acceptable value.

Claims (1)

Invention Formula A correction device, which contains an inertial link, which is connected to the input of the device’s stepped signal, and a differential amplifier, characterized in that, in order to improve the accuracy of the device, an adder is entered into it, the first input of which is connected to the output of the inertial link, the second the input with the output of the differential amplifier, and the output of the adder is the output of the device, the driver of the control pulses, the first and second controlled keys, the control inputs of which through the driver of the control pulses dinene with the input clock frequency of the device, the first and second memory elements, the switching contact of the first key connected to the input of the step signal of the device, its opening contact through the first memory element connected to the closing contact of the second key, and the closing contact of the first key through the second memory element This is connected to the break contact of the second switch, the switching contact of which is connected to the first input of the differential amplifier, the second input of which is connected to the input of the step signal of the device Twa. FIG. one