SU1183988A1 - Timebase amplifier - Google Patents

Abstract

A DEPLOYABLE AMPLIFIER containing a series-connected first adder, an integrator, a main relay element, a first input code of the first adder is an amplifier input, a second adder, characterized in that, in order to improve operation accuracy, a group of relay elements is entered into it, and the number of relay elements the group is even, the output of the main relay element is connected to the first input of the second adder, the output of which is connected to the second input of the first adder, the inputs of the relay elements of the group are connected to you ode integrator vyhody.releynyh group elements connected to respective rows WMOs second adder whose output is the output of the amplifier. (L

Description

1 The invention relates to amplifying devices with a pulse-width signal transform and can be used in unbroBEjx computers. The aim of the invention is to improve the accuracy of work. FIG. 1 shows a function 1-terminal on the scheme of the proposed deployment amplifier; in fig. 2-5 - time diagrams of signals. The amplifier contains the main relay element 1, a group of relay elements, the first 3 and second 4 adders, the integrator 5, the input 6 and the output 7 of the sweep amplifier The sweep amplifier works as follows. The main relay element 1 and the group of 2 relay elements, the number of which in the group must be even have symmetrical zero-level switching thresholds + B, the output signal of the relay elements varies discretely within the limits of + A. The transmission coefficients of the first and second adders 3 and 4 are taken equal to one. Integrator 5 has a non-inverting transfer function. We restrict ourselves to considering a variant that assumes the presence of three relay elements (Fig. 2b) with switching thresholds ± B, tB and + Br, and we assume that at the initial time t 0, the relay elements go to state + A ( figv, d, d) and the signal at input 6 is equal to zero (fig.2a). In this case, a pulse is generated at the output 7 with an amplitude equal to 3A (Fig. 2e), and the output signal of the integrator 5 increases in the positive direction (Fig. 26). At time t (Fig. 2b), the main relay element 1 switches and the signal at its output (Fig. 2b) changes the sign to the opposite one. This entails a decrease in the amplitude of the signal at the output of 7 V () to the level A (Fig. 2e) and a decrease in the rate of increase of the output signal of the integrator 5 (Fig. 2b). At time t (Fig. 2b), state-A switches elementary relay element 2 2 (Fig. 2d), and the signal at output 7 (Fig. 2e) changes sign to opposite. In the next conversion cycle, the signal at the integrator output (Fig. 2b) increases in the negative direction. At the time the condition of equality of the output signal of the integrator 5 is fulfilled to the threshold equal to -B, switching of the relay element 1 occurs (fig.2biv) and at the output 7 a positive polarity pulse is formed (fig.2e). During time 1, the orientation of the states of the relay elements 1,2 and 2 is completed. Relay elements 2 and 2 are in opposite states (Fig. 2d and e), and the path formed by integrator 5 and relay element 1 (Fig. 2c) enters self-oscillation mode. Considering that the signal at input 6 is zero (Fig. 2a), during the time Tr (Fig. 2c and e) the output voltage of the amplifier (constant component) is zero. Suppose that at time tj (Fig. 2a), the signal x- (t) increased jumpwise by x (t) (.x., where A is the first zone of signal change at input 6, at which the state of the relay elements 2 and 2 are opposite (FIG. 2d). Then during T02 (Phg. 2c and e), the constant component of the signal at output 7 is proportional to the signal at input 6. This happens because in one of the auto-oscillations half-periods the signal at the integrator's output 5 (Fig. 26) is changed by the sum of the signals at the inputs of the first adder 3 (Fig. 2a and e), and in the other half period - under the action of the difference of these signals. 1 Suppose that at the moment of time t 4. (Fig. 2a) the signal at input 6 has increased to the value of x, dx (t): 1 X2, where (x2 is x-,) is the second zone changes in the amplitude of the signal at input 6. Then, due to the fact that x (t) - | Ubych () 1 O, the output signal of the integrator 5 (Fig. 2b) will continue to change in the positive direction. When Equalized, the output signal of the integrator 5 the switching threshold B of the relay element 2 will not occur, since it is in a negative state (FIG. 2d), and at the time of equality of outputs one signal of the integrator 5 to the threshold B (Fig. 2b), the relay unit 2 2 switches (FIG. 2d) and its output signal becomes equal to -A. This entails an increase in the amplitude of the signal at output 7 to the level of -3A (fig.2e). At the same time, at the output of the first adder 3, the resulting signal will be negative and the output signal of the integrator (Fig. 26) will start to change in the negative direction. If the integrator 5 output signal is equal to the threshold B, the relay element 1 switches (: FIG. 2b and the amplitude of the pulses at output 7 decreases to the value A) (FIG. 2e). As the signal at input 6 (Fig. 2a) increases, the growth rate The signal at the output of the integrator 5 will increase (Fig. 2b), and the rate of decline will decrease. As a result, the zone -2A of the signal at output 7 (Fig. 2e) will be filled with the pulses Ure, (t) (Fig. 2c), and the resulting function the DOC transmissions will have the form Y. - x (t). Where Y is the component of output 7 is useful. Suppose that the signal to input 6 (fig.Za) is linear and Changes in a positive direction. Up to time point t (fig.Za), relay elements 2.2 are in opposite states, which leads to mutual compensation of their output voltages (figure 2 gd). 1 with integrator 5 is in the steady-state auto-oscillation mode (Fig. 36 and b), and the signal at output 7 varies in sign within A (Fig. 3e). At t 7 / tj, the signal x (t). ), therefore, the signal at the output of the integrator 5 (Fig. 36) does not melt in the negative direction, which at time t, causes the switching of relay element 2 (Fig. 3g) and increases NIJ amplitude of the signal at the output 7 to a level + IN (fig.Ze). With the growth of the signal at input 6 (fig.Za), the zone + 2A (fig.Ze) of the signal at output 7 is filled with the signal Ur-) (t) from the output of the relay element 1 (fig.Sv). Thus, for lx (t) | 1 x, g (relay elements 2, and 2, i are in opposite states when their output signals cancel each other and the pulses at output 7 vary in amplitude within + L. In the case of tx (t) 7. the relay elements 2 and 2 are in the same conditions, the sign of which is opposite to the sign of the signal at input 6, and the frequency-width-pulse modulation is carried out in the second zone 2A (FIG. 3, f). the total (odd) number of relay elements the resulting amplitude range of the output signal will be divided into several b More small (in amplitude) modulation zones. As a result, when filtering the voltage on step 7, the amplitude of the pulsations of the signal at the output of the demodulating filter will be reduced without increasing the filter time constant, i.e. the introduction of a group of relay elements Consider the mode of operation with non-symmetric switching thresholds of the junction elements 1, 2 and 2z. Suppose that В B2 БЗ and / -Bj / -Bj (Fig. 46). Then, at time ment t. (FIG. 46), relay relay 1 will go to state -A (FIG. 4 c), and at time t (FIG. 46), switching of relay element 2 will occur (FIG. 4d). At t 7 t2, the signal at output 7 is -A (FIG. 4e) and the signal at the output of integrator 5 (Fig46) will change in the direction, until it reaches the level -Bjf at which the next operation of the relay element 2 will occur. Subsequently, at O .jf x (t). for the time e51 (Fig. 4d), the integrator 5 and the relay element 2 will operate in the self-oscillation mode, and the relay elements 1 and 22 will be in opposite static states (Fig. 4c). At time t (Fig. 4a), when x (t) Xj. 5. The relay element 2 will go to the static state -A (FIG. 4d), and in the switching mode it will turn out to be a relay element 2 2 (FIG. 4e,).

When x (t) O (fig.Za) until time tj. in the switching mode, there is a relay element 2 (Fig. 3g). At time tt, when (x (t) I, the relay element 2 goes into the static state + L (Fig. 3g), the same state of the relay element 22 (Fig. 3e) the relay element 1 turns on in the self-oscillation mode (Fig. In this case, the amplitude of the saw at the output of integrator 3 (fit.5b) is normalized by the ± V zone.

g

Thus, the asymmetry of the switching thresholds of the relay elements

does not affect the characteristic of the output signal 7, however, it leads to a change in the operation algorithm

relay elements 1, 2 and 2, which now periodically depending on the sign and signal level at input 6 are in both static and auto-oscillatory modes.

Such a mode of operation in a number of cases is more preferable from the standpoint of reliability of the scanning amplifier as a whole, since it allows to distribute evenly among all the relay elements the number of their switching on per unit time.

oh oh

It

I,

S,

X

0 A

I,

S,

H,

four

 v "e" c "S" "

a “a o

SE

5

Claims (1)

A DEVELOPER AMPLIFIER comprising in series a first adder, an integrator, a main relay element, a first input of the first adder is an amplifier input, a second adder, characterized in that, in order to improve the accuracy of operation, a group of relay elements is introduced into it, and the number of relay elements in the group - even, the output of the main relay element is connected to the first input of the second adder, the output of which is connected to the second input of the first adder, the inputs of the relay elements of the group are connected to the output int the actuator, the outputs of the relay elements of the group are connected to the corresponding inputs of the second adder, the output of which is the output of the amplifier. Q0 00 ί © 00>