Thyristor rectifier with adjustable output voltage. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Thyristor rectifier with adjustable output voltage. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters

Comments on the article

The thyristor rectifier, the circuit of which is shown in the figure, allows you to get an adjustable constant voltage at the output in the range of 0-250 V at a current through the load of 0,15 A. The efficiency of the rectifier depends on the load and can reach 98%. The rectifier is made according to a full-wave circuit, and a thyristor is connected in series with the diode in each arm.

The opening of the thyristors occurs alternately with a positive half-wave of voltage on them at the moment the control signals are applied to the control electrodes. The regulation of the rectified voltage is carried out by changing the phase of the control signals relative to the beginning of the half-cycle. The thyristors close at the end of the positive half-wave of the voltage applied to them.

Thyristor rectifier with adjustable output voltage

The thyristor triggering moment is controlled by a phase shifter formed by transformer winding II, capacitor C1, variable resistor R2 and resistor R1. The phase change of the alternating voltage at the output of the phase shifter is carried out by the resistor R2. The voltage amplitude at the output of the phase shifter almost does not change. If you use diodes and thyristors with a high allowable reverse voltage in the rectifier, resistors R3, R4, R6 and R7 can be eliminated. In order to reduce the amplitude of the current pulses in the rectifier circuits, a resistor R2 is connected in series with the capacitor C5. Diodes D5 and D6 serve to provide the necessary polarity of the control signals on the thyristors D3 and D4. Resistor R1 limits the current of the control electrodes of the thyristors.

If galvanic connection of the rectifier load with the network is allowed and a rectified voltage greater than the mains voltage is not required, then the rectifier can be made without a power transformer Tp1. In this case, the anode terminals of the diodes D1, D2 are grounded, and the network wires are connected to points A and B. To power the phase shifter, in this case, it is necessary to make a separate transformer with a power of 5-10 W with a secondary winding of 20 V. The rest of the scheme does not change.

Transformer Tr1 is wound on a Ш32Х40 core and has windings: I - 435 turns of PEV-2 wire 0,6+ +315 turns of PEV-2 wire 0,43; II - 2X38 turns of wire PEV-1 0,25; III-2X870 turns of wire PEV-2 0,38. The inductor Dr1 is wound on a Sh22X22 core, its winding consists of 600 turns of PEV-1 0,32 wire with a tap from the middle.

Any suitable thyristors can be used in the rectifier. The uncontrolled switching voltage of thyristors should not be lower than the amplitude value of the voltage supplied to them. The disadvantage of the described rectifier is a noticeable decrease in the output voltage (especially at low values) when the load is connected.

Authors: G. Alekseev, N. Vasiliev, Kuibyshev; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Voltage converters, rectifiers, inverters.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Traffic noise delays the growth of chicks 06.05.2024

The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>

Wireless speaker Samsung Music Frame HW-LS60D 06.05.2024

In the world of modern audio technology, manufacturers strive not only for impeccable sound quality, but also for combining functionality with aesthetics. One of the latest innovative steps in this direction is the new Samsung Music Frame HW-LS60D wireless speaker system, presented at the 2024 World of Samsung event. The Samsung HW-LS60D is more than just a speaker system, it's the art of frame-style sound. The combination of a 6-speaker system with Dolby Atmos support and a stylish photo frame design makes this product the perfect addition to any interior. The new Samsung Music Frame features advanced technologies including Adaptive Audio that delivers clear dialogue at any volume level, and automatic room optimization for rich audio reproduction. With support for Spotify, Tidal Hi-Fi and Bluetooth 5.2 connections, as well as smart assistant integration, this speaker is ready to satisfy your ... >>

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Random news from the Archive

Jellyfish restore the body 04.07.2015

All living beings have the ability to regenerate, it’s just that for some it is expressed to a lesser extent (for example, we cannot grow a finger or a leg to replace the lost ones), for someone it is more (for newts, for example, to restore a leg , eye or some internal organ is not a problem at all). Champions of self-healing can be called coelenterates - hydras, jellyfish and their relatives, although here it should still be remembered that they are much simpler than the same newts. In studies of regeneration, one of the most frequent model objects is the freshwater hydra from a biology textbook, which, after any injury, after any damage, can do everything as it was.

But, as it turned out, coelenterates do not always "do everything as it was." Michael Abrams (Michael Abrams) and his colleagues from the California Institute of Technology experimented with larvae-ethers of the jellyfish Aurelia eared. Ethers are simpler than adult jellyfish: a small disc-shaped body with 8 double outgrowth lobes at the edges, no tentacles as such, the digestive system is underdeveloped. One or more "arms" - blades were cut off from the larva, after which it healed the wound rather quickly, in a few hours. However, a new blade did not appear to replace the lost one. Instead, the ether rebuilt the body so as to become symmetrical again - regardless of how many "arms" were left for her, seven, five, or just two.

As you know, jellyfish are radially symmetrical animals: they can distinguish the upper part of the body from the lower, but it is impossible to separate the left side from the right. When moving, the jellyfish “slams” its dome and oral lobes (and the larva with the lobes located along the edges of the body), and it is the symmetry in its own structure that allows animals to move in the right direction. If any of the "limbs" is missing, then due to the resulting empty space, hydrodynamics will be disturbed, the water flows will go the wrong way when pushed, and the jellyfish will not be able to control its movements. Therefore, it turns out to be more important for the larva not so much to re-grow the lost lobe as to restore the symmetrical structure of the body. Moreover, asymmetric ether quite often, in 15% of cases, could not turn into an adult jellyfish at all.

In an article in PNAS, the authors write that the body of the larvae was rebuilt by muscular efforts: if a substance that relaxes muscle cells was added to the water where they lived, then symmetrization occurred much more slowly. On the contrary, if the ether muscles under the influence of an increased concentration of magnesium salts began to contract faster, then the symmetrical structure was restored more quickly.

Obviously, the whole point here is that due to the loss of the blades, the mechanical forces in the body of the jellyfish turned out to be unbalanced, which naturally led to a restructuring of the elastic body. At the same time, ethers did without stimulating active cell division and death, as it happens in regenerative processes in other animals - obviously, an acceptable result can be achieved mechanically here without high energy costs for cellular dynamics. Larvae of other species of jellyfish also turned out to be capable of symmetrization - of course, it would be interesting to find out whether adult jellyfish and other radially symmetrical organisms are capable of such a trick.

The results obtained once again tell us that morphogenesis is the formation of body parts, organs, etc. - depends not only on molecular genetic processes, but also on purely physical interactions between different parts of the body. It is known that human cells also sensitively react to mechanical forces, which can sometimes have a decisive influence on their cellular fate; it is possible that in the medical regeneration of our tissues and organs, more success can be achieved if we pay attention to their "physics".

Other interesting news:

▪ Biocompatible electrode cloth for clothing

▪ Solar tower providing electricity around the clock

▪ Cars wink at the oncoming

▪ The ozone layer is recovering

▪ Atmospheric nitrogen battery

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Chargers, accumulators, batteries. Article selection

▪ Article Man in society. Basics of safe life

▪ What is unique about France in IX-XI? Detailed answer

▪ article Burns. Health care

▪ article Another version of the antenna for a cell phone. Encyclopedia of radio electronics and electrical engineering

▪ article Punished curiosity. physical experiment

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews