SU885903A1 - Device for comparing amplitudes of harmonic signals of equal frequency - Google Patents

Description

Compared harmonic signals, for example, U and Uij (Fig. 2 a, b) are fed through the input terminals 1 to the inputs of the corresponding signal processing units 2. In the first signal processing unit, the main harmonic signal is fed to the inputs of the phase shifters 3, the amplitudes of the signals u, and (Fig. 2 s), at the inputs of which are kept equal to the amplitude of the main signal, and their phases differ from the phase of the main signal by angles,

2Jr. 2Л 4ТГ, equal К (for example, г- and, -) / where

n is the number of signals of one group, K the number of additional signals. The axial U-, and additional u,, u signals through the keys 4 are fed to the inputs of the adder 6 and the zero-organs 5 that control the keys 4. Until any of the signals U, UJ, go, through the zero level from minus to plus all keys open, and the signal at the output of the adder is zero (geometrical sum of the main and auxiliary signals). At the moment of fixation of the transition point through the zero signal level, for example, Uj (Fig. 2 e), the signal from the output of the corresponding Hyjib body closes all keys except the key, the output of which is connected to the input of this zero body. As a result, from this moment, from the output of the adder 6, the signal U (FIG. 2 e) is fed to one of the inputs of the comparison unit 7.

The processing unit also works in a similar way, to the input of which the signal Ui2 is applied. As can be seen from the timing diagrams (Fig. 2 b, d, f), the output of this signal processing unit 2 is sent to the second input of the comparison unit 7 signal} i. Comparison unit 7 compares the harmonic signals applied to its input in amplitude.

The formation in the signal processing blocks of each main signal at the same time (p-1) additional signals whose amplitude is maintained equal to the amplitude of the main signal, the phases of which differ from the main signal by angles equal to 2K -K and prohibition (p-1) signal5

fishing in each signal group, phase

which is lagging behind the phase of the signal, the moment of transition through the zero level is fixed first, allows reducing the time for waiting for the reference moments of crossing the zero level when generating additional signals depending on the agitations of the compared signals.

Claims (2)

1. USSR Author's Certificate No. 387330, cl. G 05 B 1/01, 1971. 2. Authors. Certificate of the USSR 425117, cl. G 01 R 19/10, 1972. H I U fig.) i i i i