SU1280399A1 - Scanning sensor - Google Patents

Abstract

The invention relates to amplifying devices with pulse-width pulse signal conversion and can be used in analog computers. The deployment converter contains the first adder 1 connected to the input of the integrator 3, the output of which is connected to the inputs of relay elements 5-1, 5-2, ..., 5-n, the outputs of which are connected to the corresponding inputs of the second adder 2, the output of which is output 8 of the converter, and to the first input of the first adder 1, the second input of which is the input 7 of the converter connected to the corresponding input of the second adder 2 additional relay element 6, the delay element .4 connected between the output of the integrator 3 and home of an additional relay element 6. In the converter, an increase in the accuracy of operation is ensured by maintaining self-oscillations at the boundaries of the modulation zones. 3 il. 1st

Description

The invention relates to amplifying devices with pulse-width signal conversion and can be used in analog computing. telny cars.

The purpose of the invention is to improve accuracy.

Fig. 1 shows a functional diagram of a development transform; 2 and 3 are timing diagrams of signals.

The circuit (figure 1) contains the first and second adders 1 and 2, the integrator 3, the delay element 4, the first, the second, .. the nth relay) the 1st elements 5-1 5-2, .. ,, 5-p, additional relay element 6, input 7 and output 8.

The ka of Figures 2 and 3 of the designation y (t) are the output signal 8, x (t) 8X. .

the signal at the input 7, у.р (t) is the signal at the output of the additional relay element 6; y (t) is the signal at the output of the first relay element 5-1; a signal at the output of the second relay element 5-2; iA is the maximum amplitude range of the signals at input 7 and output 8.

The sweep converter works in the following manner.

The relay elements 5-1, 5-2, ..., 5-p and the additional relay element 6 are made with a non-inverting hysteresis loop and symmetrical

Relative to zero, the switching thresholds are ± V. The transmission coefficients of the first and second adders 1 and 2 are taken equal to one.

We assume that the transfer coefficient of the converter with respect to the input signal is one, and the number of relay elements corresponds to the minimum — three, i.e. the first and second relay elements 5-1, 5-2 and an additional relay element 6 are included. A further increase in the number of relay elements leads only to an increase in the number of modulation zones.

Consider the signal timing diagrams (Fig. 2) provided that the first and second relay elements 5-1 and 5-2 and the additional relay element 6 have switching thresholds ± В ,, t В, 1 V., satisfying the condition (Fig. 2 b)

/ iB, - / / / heB.,,/ / ± Bj /,

When the signal from input 7 (Fig. 2a) is in the first zone, A / 3, and | x (t) | "I-A / 3 |, in switching mode, the first relay element 5-1 operates (Fig. 2c), and the state of the output data of the signals of the second

relay element 5-2 and additional relay element 6 of figure 2 g, d) opposite, which leads to their mutual compensation. As a result, the output 8 (Fig. 2 e) forms

pulses that completely repeat the waveform at the output of the first relay element 5-1 (Fig. 2c). In this case, the self-oscillation mode is implemented as follows, In one

from the half-cycles of the developable conversion, the signal at the output of the integrator 3 is formed under the action of the difference of the signals at the inputs of the first adder 1, and in the other half-cycle under the action of the sum of these signals

(Fig. 2 a, b, e). The switching of the first relay element 5-1 does not occur at the instants of the execution of condition I Y, (t) | IB J, and with a delay t determined by the parameter of the block delay element A (Fig. 2 b), this leads to an increase in the saw amplitude Y | (t) relative to the threshold levels ± B and reduces the frequency of self-oscillations, but does not reflect on the constant output pulses, the level of which for the period. self-oscillations reaches a value proportional to the signal at the input 7.,.

The maximum increment of the amplitude of the sweep due to the delay element 4 corresponds to the transition of the output signal of the integrator 3 from the maximum derivative to the minimum (Fig. 2b).

Suppose that at time t (Fig. 2a) the signal at input 7 increased to a value close to the transition to the second modulation zone. If there is no 4 delay element

this would cause a sharp decrease in the frequency of the pulses at the output 8.

The presence of delay element 4 leads to the following processes

In the time interval t

Claims (1)

(Fig. 2 a, e) the derivative of the output signal of the integrator 3 has sharply increased, melts (Fig 2, b). The delay time (Fig. 26) is longer than the time required for the Integrator 3 signal to reach ± B, when the second relay element 5-2 switches to ± A / 3 state (Fig. 2 d) JH and A level is formed at output 8 3 The rate of change of the output signal of the integrator 3 drops simultaneously with a change in the sign of its derivative, with a delay at time t (Fig. 26, c) the switching of an additional relay element 6 (Fig. 2 c) occurs, and at output 8 (Fig. 2, e) a positive pulse is generated in the second modulation zone. This leads to an increase in the output signal of the integrator 3, which, changing in the negative direction at time t (Fig. 2 g), causes the switching of the first relay element 5-1. The amplitude of the signal at output 8 is again reduced to a value of 1 A / 3 (Fig. 2e), and the rate of change of the sweep decreases. After a time delay at time t (Fig. 2b, c), an additional relay element 6 is triggered and the sign of the signal at output 8 of FIG. 2 e). A new sequential development cycle begins. At time tg, the new relay element 5-1 switches again, and the additional relay element 6 is activated later after the delay time (Fig. 2b, c, d). As a result, two (and not one, as in the prototype) relay elements are in the switching mode at the same time, the first relay element 5-1 (Fig. 2 g) is ahead of the instants of time for changing the sign of the signal at the output of the additional relay element 6 (Fig. 2 at). This causes a sharp increase in the frequency of the pulses at the output 8, which form simultaneously in the adjacent modulation zones, and only in the case when the signal at the input 7 approaches the boundary between the modulation zones of the sweep converter. This eliminates the dead zones of the auto-oscillation mode. Suppose that at time t (FIG. 2 a) the input signal has reached a level that corresponds to the second modulation zone. Then, as the amplitude of the signal at input 7 increases, the converter leaves the high-frequency generation mode, which ends at time t (Fig. 2c). The state of the first relay element 5-1 is fixed (Fig. 2g) and corresponds to the state of the second relay element 5-2 (Fig. 2e), and the pulses in the second modulation zone (Fig. 2e) are formed by switching additional Relay element 6. The change in the sign of the signal at input 7 works in the same way, with the additional and second relay elements 6 and 5-2 entering the simultaneous switching mode at the interface of the modulation zones, the first relay element 5-1 is fixed in a static negative condition. The proposed sweep pre-. the former, in comparison with the prototype, is characterized by a higher work accuracy due to the preservation of the self-oscillation mode at the boundaries of the modulation zones. The invention develops a converter comprising a first adder and an integrator connected to the output, to the output of which are connected the inputs of relay elements, the output of each of which is connected to the corresponding input of the second adder, the output of which is the output of the converter and connected to the first input of the first adder, second input which is the converter input, an additional relay element, the output of which is connected to the corresponding input of the second adder, characterized in that pour povsheni accuracy of B has entered the delay element, the output of the integrator through a delay element is connected to the input of the additional relay element.