SU726645A1 - Ac voltage regulator - Google Patents

Description

(54) DEVICE FOR REGULATING VARIABLE

VOLTAGE

one

The invention relates to the field of electrical engineering, in particular to converter equipment, and can be used, for example, as a preliminary step of voltage stabilization in power supply devices of electrical installations.

A device for controlling alternating voltage is known, which contains a transformer, a switch taps the windings, a synchronization unit, the input of which is connected to the input terminals of the device, and the output is connected to one of the counter inputs, the first measuring unit, the output of which is connected to the specified counter and clock generator one.

A disadvantage of the known device is the inertia of the formation of control signals due to the fact that the switching of taps occurs only when the current passes through zero.

The aim of the invention is to increase speed by adjusting for deviation from the instantaneous value.

This is achieved by the fact that the device is equipped with a block for adjusting the phase of the reference voltage and a block for the initial installation of the counter, the input of which is connected to the output of the synchronization block, and the output is connected to another input of the counter, while the output of the block for adjusting the phase of the reference voltage is connected to one of the inputs of the block the reference voltage, and its input is with the input pins of the device.

The drawing shows the functional diagram of the device for voltage regulation.

The device contains a transformer 1, switches 2 and 3 taps of windings, a counter 4, a deflector 5, a comparison unit 6, a counting direction block 7, a block 8 for the initial installation of the counter, a synchronization block 9, a reference voltage block 10, a reference voltage self-tuning block 11 , generator 12 clock pulses, logic circuits 13-16, high-frequency generator 17,

The device works as follows.

The input voltage through one of the switches of the switch taps 2 enters the transformer 1 and through one of the switches of the switch taps 3 to the output of the device. You ;; one voltage of the Uewx device is fed to a comparison block 6, to the other input of which a variable voltage is supplied from the block 10 of the reference voltage. The operation of the reference voltage unit 10 is synchronized by the output signal of the synchronization unit 9. The phase of the OUTPUT signal of the reference voltage unit -10 is adjusted in phase to the input voltage UBX using the self-tuning unit of the phase reference voltage II. When the output voltage deviates from the reference voltage by a certain amount, and depending on the sign of the deviation, signals UH or U are generated at the output of the counting direction block 7, which determine the counting direction, which through logic circuits 13 or 14 arrive at counter 4 and simultaneously through logic 15 - to start the clock pulse generator 12. Under the action of the clock pulse, the counter 4 changes its state, and the output signal of the decoder 5 provides a new combination of the switched switch keys 2 and 3, and therefore Oh, the new transformer ratio 1.

The initial setup unit 8, connected to the output of the synchronization unit 9, provides, at the beginning of each half period of the input voltage UBX, setting the counter 4 to the position corresponding to the maximum transformation ratio of the transformer 1. This allows the initial part of each half period when the deviation and output from the reference voltage it is still not sufficient to generate the Ying or UBC signals of the counting unit 7, to ensure that the nominal value is exceeded, thereby eliminating the possibility of a failure in the output

726645

voltage Logic circuits 13 and 14 implement the function “prohibition when the counter reaches 4 extreme positions. Logic 15 implements the OR function. To control the keys of the switches 2 and 3, a high-frequency generator 17 is used, the output pulses of which through the logic circuit 16 opened by the output signals of the decoder 5 are fed to the control inputs of the corresponding keys.

Claims (1)

Invention Formula An alternating voltage control device comprising a transformer, the winding taps of which are connected to switches, a synchronization unit whose input is connected to the input terminals of the device, and the output to one of the counter inputs and a measuring unit whose output is connected to the indicated counter and unit the reference voltage, characterized in that, in order to improve speed, it is equipped with a block for adjusting the phase of the reference voltage and a block for the initial installation of the counter, the input of which is connected to the output of the synchronization unit and the output is connected to another input of the counter, the output of the block for adjusting the phase of the reference voltage is connected to one of the inputs of the reference voltage block, and its input is connected to the input terminals of the device. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 513349, cl. G 05 F 1/30, 1976.