RU8847U1 - AC VOLTAGE STABILIZER - Google Patents

Abstract

1. The AC voltage stabilizer, including a transformer-key regulator included between the input and output terminals, a reversible counter, inputs of the forward and reverse counts connected to the outputs of the comparators of the upper and lower levels, the inputs of which are connected to the output terminal through a measuring body, characterized in that a decryptor and a device for determining the transition of current through zero are introduced into it, connected to the output terminal with its input, and with the output to the synchronizing input of the reverse account Linda, whose outputs are connected to inputs of the decoder, the outputs of which are connected to control inputs of the regulating organa.2. The stabilizer according to claim 1, characterized in that the keys of the regulatory body are made in the form of mechanical relay contacts. The stabilizer according to claim 2, characterized in that a signal delay device is connected thereto, connected by its input to the output of the device for determining the transition of current through zero, and the output to the synchronizing input of the reversible counter.

Description

AC VOLTAGE STABILIZER

The utility model relates to the field of electrical engineering and can be used in the manufacture of accurate, high-speed AC voltage stabilizers.

There is a method of controlling a discretely adjustable AC voltage converter and a device that implements it, containing a transformer-key controller L; an organ with taps connected by control inputs to a reversible counter, the counting inputs of which are connected through the statistical processing nodes to the outputs of the first and second comparators, respectively. The inputs of the comparators are connected through the measuring body to the output of the device, and their gate inputs are connected to the pulse shaper. (Description of the invention to the AS of the USSR f 1636961, S.C. N M).

The known device does not make it possible to coordinate the moment of switching the steps of the transformer with the moment of transition of the current through zero. This creates impulse noise in the network. When switching the transformer windings using mechanical relay contacts, the load circuit breaks briefly, which leads to the operation of uninterruptible power supply units.

The problem solved by the utility model is to improve the switching conditions when switching the transformer windings and to improve the quality of stabilization of the alternating voltage.

The technical result is the elimination of impulse noise in the network by coordinating the moment of switching stages

IPC N 02 M 5/22

The specified technical result is achieved by the fact that in the AC voltage stabilizer, which includes a trans $ key-regulator, connected between the input and output, outputs, a reversible counter, inputs of the direct and reverse counting connected to the outputs of the comparators of the upper and

lower levels, the inputs of which are connected to the output terminal through the measuring organ,

the current passes through zero, connected with its input to the output terminal, and with the output - to the synchronizing input of the reverse counter, the outputs of which are connected to the inputs of the decoder, the outputs of which are connected to the control inputs of the regulatory body.

The utility model is illustrated by drawings, where Fig. 1 shows a block diagram of an AC voltage stabilizer; Fig. I is a timing diagram illustrating the operation of the signal delay device.

The AC voltage stabilizer contains a regulator 1 based on a transformer-key structure, connected between the input and output terminals, a reversible counter 2 inputs of the direct and reverse counting connected to the outputs of the comparators 4 and D, respectively, of the upper and lower voltage levels, a decoder 3 connected between the reversible counter 2 and controlled by the keys of the regulatory body 1, the inputs of the comparators 4 and 5 are connected to the output of the measuring body 6, the input of which is connected to the output of the stabilizer, ystvo determining the transition of current through zero 7 input is connected to the output terminal and to the synchronization output-input of the reversible counter. When performing the keys of the regulatory body 1 in the form of mechanical relay contacts, such as electromagnetic, between

decoder and

the device for determining the transition of the current through zero 7 and the clock input of the counter additionally include a device for delaying the signal 8 for 6 ms. The stabilizer also contains a device, not shown in the diagram, for setting the reverse counter 2 to the zero state, connected between the stabilizer input and the zero setting input of the reverse counter 2.

The device delay signal 8 can be performed, for example, similarly to the device (see, Handbook of electronic circuits, t., M., Energy, 1978, S. 356).

The device for determining the transition of current through zero can be performed according to the recommendations of the above source (see, section 4, p.325 ... 385).

Transformer-key regulatory body can be performed according to the recommendations of the source as described to A.S. 13443347, M.KlG G 05 F 1/44, 1E85g.

The stabilizer works as follows. At the moment the stabilizer is turned on, the reversible counter i is set to state O at all its outputs .. This state is converted by the decoder 3 and the control code corresponding to the minimum voltage at the output of the stabilizer is fed to the inputs of the keys of the regulator 1. The output voltage of the stabilizer is fed to the input of the measuring body 6, where it is rectified and filtered. Next, the converted output voltage is supplied to the inputs of the comparators 4, 5 of the upper and lower levels. If the output voltage is less than the lower threshold, the comparator of the lower level is activated and gives permission to generate a counting pulse, a trigger pulse is supplied to the synchronizing input of the reverse counter from the output of the device 7 for determining the transition of current through zero. The reversible counter increases its state by one. The code of the reversible counter is converted by the decoder, after which the keys are operated in such a way that the output voltage rises by one step. Further, the process is repeated until the voltage at the output of the stabilizer is established within normal limits. When the output voltage rises above the upper threshold, the upper level comparator 4 is triggered, the reverse counter 2 switches to the reverse mode and at the moment the current passes through zero decreases its state by one. The code of the reverse counter 2 is converted by the decoder 3 and the keys reduce the output voltage by one step. Further, the process is repeated until the voltage corresponding to the norm is set at the output.

If the keys of the transformer-key regulatory body are made in the form of mechanical relay contacts, a signal delay device for a period of 5 ms is introduced into the stabilizer circuit (the top of the half-wave of the mains voltage at a frequency of oOHz). in this case, the switching of the relay occurs at the half-wave decay (dig.2) This is done in order to ensure the normal operation of the stabilizer together with an uninterruptible power supply.

Thus, the use of a utility model allows to obtain a high-quality, high-speed AC voltage stabilizer, the scope of which includes stabilization of the supply voltage of household appliances, copy machines, medical equipment.

Claims (3)

1. The AC voltage stabilizer, including a transformer-key regulator included between the input and output terminals, a reversible counter, inputs of the forward and reverse counts connected to the outputs of the comparators of the upper and lower levels, the inputs of which are connected to the output terminal through a measuring body, characterized in that a decryptor and a device for determining the transition of current through zero are introduced into it, connected to the output terminal with its input, and with the output to the synchronizing input of the reverse account Linda, whose outputs are connected to inputs of the decoder, the outputs of which are connected to the control inputs of the regulatory body.  2. The stabilizer according to claim 1, characterized in that the keys of the regulatory body are made in the form of mechanical relay contacts. 3. The stabilizer according to claim 2, characterized in that a signal delay device is connected thereto, connected by its input to the output of the device for determining the transition of current through zero, and the output to the synchronizing input of the reversible counter.