SU146872A1 - Automatic M / Y compensator - Google Patents

Description

The subject of the invention is an automatic PN-aspect ratio compensator with two balancing channels along orthogonal projections of a compensated voltage, the peculiarity of which is the use in each channel — for performing discrete balancing — stepping finders, to the lamers of which are connected resistive shaped devices, which are connected by resistors, which are shaped like resistors, to which discrete balancing - stepping finders, all of which are connected, are connected to form resistors that are shaped like resistors, to which discrete balancing - step finders, are connected. discrete balancing dividers.

The proposed implementation of the compensator provides a sufficiently high speed and high measurement accuracy, as well as the possibility of obtaining a digital readout and a fairly simple transfer of measurement results over a distance.

FIG. 1 is a schematic diagram of the proposed compensator; in fig. 2 is a control circuit for step finders.

The compensator includes: an in-phase compensating unit for its voltage Ukx, a quadrature compensating unit for voltage U / uj, an unbalance amplifier Y, phase-sensitive rectifiers 0Bi and PV, whose reference voltages coincide with the phase with corresponding voltage compensating for them Uhx and t / ,,., Polarized relays P and PZ, which react to the unbalance signal and control the operation of the LUHi step finders - ShI, switches for reversing compensating voltages and GTI clock generator.

Differential voltage (unbalance voltage, 1., Is fed to the input of amplifier Y and then to phase-sensitive rectifiers F and FV2. Depending on the sign of the difference voltage, one of the contacts of the polarized relay closes, step finders come into effect (and In operation, one step finder is always in each block of the compensating voltage) and the PFL 146872-2 is shifted until an equilibrium position is reached, i.e., the difference voltage is zero.

Amplifier system - a block of compensating voltages forms a balancing channel. Since there are two compensating blocks in the compensator, their voltages are t / ft.T and Uky, respectively, there are two balancing channels that, during the balancing process, can affect one another, increasing the balancing time, and in some cases unstable state.

With the appropriate setting of the phase sensitivity of the EF and EFV rectifiers, it is possible to achieve a condition in which the balancing channels do not affect each other. In addition, as studies have shown, if the degree of interconnection between the balancing channels is small, then the balancing process also proceeds steadily.

As can be seen from FIG. 1, each of the step finders mixes its engines at the same time along two resistance dividers, one of which serves to obtain a compensating voltage, and the other to maintain the total resistance in the circuit of the dividers and, accordingly, to stabilize the current in the circuit of the dividers pressures.

 the balancing process in the compensator is discussed with digital examples. If the compensating voltage (//; a- 0, and the component of the measured voltage, coinciding in phase with the compensating voltage Uhx, is equal to, then the polarized Pt relay (Fig. 2) closes the contact fii and receives power from the W pin) shchikoi finder WI, the slider of which rotates at a full angle. At the same time, the compensating voltage Vhx 9. In the extreme position of the step finder the contact / C / CiE is closed and at the same time in another contact of the step finder (which is not shown in the diagram) the coil circuit is de-energized. seeker shi stop TC, turns on the coil of the step finder I / Yag and drives its slider. In the extreme position of this slider / "99. Similarly, through the contact KKzB turns on the coil I / 3B of the stepper searcher ShI and de-energizes the coil of the seeker ShI2. Thus, compensating voltages f are obtained /fi.199, 299, 399. With a compensating voltage // "399, it becomes larger than the measured value, as a result of which the sign of the signal on a polarized relay changes and the balancing process proceeds in the following sequence: / V /" 399, 398 , 397 ... 390, 380, 370. At the same time, changing The sign of the imbalance and the I / Ya step finder engine begin to move in the direction of increasing the compensator, its voltage / 7, 370, 371, 372, 373, 374 and 375.

Since,.. F, the contact of the polarized relay is set to the middle position and the equilibration process is terminated.

Since the beginning of the balancing process, the step finders have passed thirty-seven "contacts. Therefore, when the response speed of the reversing stepper finders is 40-50 Hz, the balancing process lasts less than one second.

If the measured voltage is U „j. at time f0 = -375 and abruptly changes its phase by 180 °, i.e., to -375, iodine closes contact M of the polarized relay PI with the unbalance signal and receives power from coil W to them. At the same time, its slider moves in the direction of decreasing compensating voltage Ukx. In the -O (Uhx +) position, the KKiM contact closes and receives the power roller Sh2M. The stepper finder slider I / Poison is shifted to the position (O ff / ftx-300) and closes the contact KK 2m. At the same time, it receives power from the Coil Wm and the compensating voltage decreases to 0.

In the closed contact, the capacitance switch turns on the reverse relay РР., Which controls the switch of the reverse voltage compensation. When the compensating voltage is reversed, the sign of the unbalance signal Af / is changed, and contact B is closed in a polarized relay. Then the balancing process proceeds as in the first case. For the entire process of balancing, the step search engine engines pass fifty-two and two contacts, i.e., the process is completed in approximately 1 second. Similarly, the process of equilibration takes place in the second channel, in which the reverse switches of the РРу are triggered from the relay RZ through the contacts of the relay M-2 and 59.

If another step finder is used in the circuit, it is possible to easily switch the measurement limits automatically.

Subject invention

An automatic rectangular coordinate compressor, containing two balancing channels along orthogonal projections of a compensated voltage, characterized in that, in order to improve the accuracy and speed of the compensator by discrete balancing, step finders are applied to each channel, which are connected to the slats of the compensator. These resistances form discrete balancing dividers.

-3-х- 146872

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