SU900253A2 - Amplitude differential zero organ - Google Patents

Description

; The invention relates to the field of automation elements and electrical measuring equipment and can be used in devices for tolerance control of complex value parameters, bridges and alternating current compensators.

According to the main "1 av1. St. No. 387330 is known for amplitude-differential null-organ containing a subtracting unit, the inputs of which are connected to the source 1I compared voltage across sequentially connected matching units and a rectifier, an integrator, the first input of which is connected to the output of the subtracting unit, and the output to the first input of the unit Comparison, time of block, the output of which is connected to the second inputs of the integrator and the block of comparison II.

The disadvantage of this il-organ is low speed, since to obtain information as a result of comparing two harmonic signals in amplitude, it takes at least half the frequency period of one of the harmonic signals as the reference.

2

The purpose of the invention is to demonstrate the speed of a well-organ.

This goal is achieved by the fact that a master unit is entered into an amplitude-differential zero-body, the first and second inputs of which are connected respectively to the outputs of the first and second matching blocks, and the output is connected to the second inputs of the integrator and comparison unit, and that there is a time master unit contains the first and second pulse formers, T-trigger and the element IL1-, the first and second inputs of which are connected so15 responsibly through the first and second pulse drivers with the first and second inputs of the time of the master block, and the output through T-t rigger output time master block.

20

FIG. 1 shows a functional diagram of an amplitude-differential null-organ; in fig. 2 - functional diagram of the time of the master unit; in fig. 3 and 4 are temporary diagrams that remove the work of the null organ,

Moreover, in FIG. 3 shows time diagrams in which the first harmonic signal passes the zero level earlier than the second harmonic signal relative to

when the zero-organ is turned on, and in FIG. 4, the first harmonic signal passes a zero level later than the second harmonic signal relative to the moment when the zero-organ is switched on

 The organ contains the first 1 and Vtera 2 matching blocks, the first rectifier 3, the time master unit 4 the second rectifier 5, the subtractor pn 6, the integrator 7 the comparison unit 8, the first 9 and the second 10 sources of the compared voltages, the element OR 11, T- trigger 12, first 13 and second 14 pulse formers, first and second U harmonic signals 15, rectified harmonic signals and, and Uj 16, the difference signal from the output of the subtracting unit 17 pulses from the outputs of the first 18 and second 19 pulse formers, pulses with output element OR 20, the signal from the output Tt iggera 21, the output signal Oba; null organ 22,

The zero-body works as follows. .

From the outputs of the first 9 and second 10 sources of compared voltages, the first U :, and second Uj harmonic signals (Fig. 3a) through the first 1 and second 2 matching blocks are fed to the inputs of the first 3 and second 5 rectifiers, from whose outputs are rectified the harmonic signals U and Uj (Fig. 3b) are fed to the first and second inputs of the subtractive unit 6, from the output of which the difference signal (Fig. 3c) is fed to the first (informational) input of the integrator 7.

From the outputs of the first 1 and second 2 matching blocks, the first U and second Uj harmonic signals are also fed to the first and second inputs of the time of the master block 4, i.e. respectively, the inputs of the first 13 and second 14 pulse formers are the time of the driver unit 4, from the outputs of which short pulses (Fig. 3 5d, d), formed at the transition moments of the first and second signals C, and Uj through the zero level, are respectively fed to the first and second the inputs of the element OR 11 are the time of the master unit 4. The pulses from the output of the element OR L1 (Fig. 3 s) are thrown

The T-flip-flop 12 is time of the block 4, each odd pulse pulses the T-flip-flop 12 into one state, and each even-numbered one goes to zero (Fig. 3 g). The signal from the output of the T flip-flop 12, which is the output signal of the time of the driver unit 4, is simultaneously applied to the control inputs of the integrator 7 and the comparator unit 8. In this case, the high-level signal allows integration even at the time t (Fig. 3h) signal to a low level, the comparison block 8 compares the signal from the output of integrator 7 with a zero level.

The use of the proposed nullorgan allows obtaining information on the ratio of two harmonic signals in amplitude over a time less than half the period of one of the signals, taken as a reference, which increases the speed of digital bridges and compensators, as well as automated process control and management systems.

Claims (2)

1. Amplitude differential zero-body according to ed. St. No. 387330, characterized in that, in order to increase the speed of the nullorgan, in it the first and second inputs are the time of the master block connected to the outputs of the first and second matching blocks, respectively. 2. The zero-organ according to claim 1, which is based on the fact that in it the time the master unit contains the first and second pulse shapers, 0 T-trigger and an OR element, the first and second inputs of which are connected respectively through the first and second pulse shapers with the first and. the second inputs are the time of the master block, and the output is via a T-flip-flop with the output the time of the master block. Sources of information taken into account in the examination 1. USSR author's certificate 50 № 387330, cl. G 05 B 1 / 01.27.12.71.