Trinistor converter, 12-24/60 volts 2 amps. Encyclopedia of radio electronics and electrical engineering

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

 Comments on the article

A diagram of a simple trinistor DC-DC converter of a relaxation type is shown in fig. 4.26.

At the moment the power is turned on, the trinistors V2 and V3 are closed, and the capacitors C1 ... C3 are discharged. Capacitors C2 and C3 begin to charge, and at some point in time one of the trinistors will open (which one depends, first of all, on the time constants for charging capacitors C2, C3). Let's assume that the trinistor V2 opens first. A current will flow through it, determined by the resistance of the winding 1a and the charge current of the capacitor C1.

Capacitor C2 is discharged through the SCR control junction and resistor R4. After opening the trinistor V2, the voltage at the anode of the trinistor V3 decreases sharply and, as the capacitor C1 is charged, begins to gradually increase. Meanwhile, the capacitor C3 continues to charge, and finally, the moment comes when the trinistor V3 opens. The voltage of the charged capacitor C1 in reverse polarity will be applied through a small direct resistance of the open trinistor V3 to the trinistor V2, and the latter will close.

A new cycle begins: the capacitor C1 is charged again, but through the trinistor V3. In this case, the capacitor C3 is discharged, and C2 is charged. Then the trinistor V2 opens again and the process repeats. During operation of the device, current pulses flow through the half-windings 1a and 1b, so the current in the secondary winding is a sequence of symmetrical pulses, close to rectangular in shape.

The frequency of the output voltage and its shape depend both on the parameters of the timing circuits for starting the trinistors and on the supply voltage, therefore the supply voltage of the charge circuit for capacitors C2 and C3 is stabilized using zener diodes V1, V4. As the test showed, when the supply voltage changes by 30%, the conversion frequency changes by no more than 6%.

Inductor L1 increases the stability of the inverter, improves the shape of the output voltage. The capacity of the switching capacitor C1 should be selected depending on the current through the SCRs. At a current of not more than 0,5 A, a capacitance of 2 μF is sufficient; at a current of up to 2 A, it is necessary to use a capacitor with a capacity of about 20 μF. The capacitor must allow operation when the voltage polarity is reversed with an amplitude twice the supply voltage.

The operability of the device is maintained when the supply voltage changes in the range from 12 to 24 V, it is only necessary to select the positions of the trimming resistor sliders to maintain the operating frequency. The generation frequency can be changed from tens of hertz to 1 kHz. If frequency stabilization is not required, resistors R3 and R8 and zener diodes can be excluded from the device. The device was tested with the transformer T1, assembled on the magnetic circuit Ш20х30. Winding I contains 2x160 turns of PEV-2-0,35 wire, winding II, designed to power a load with a voltage of about 60 V, contains 780 turns of PEV-2-0,25 wire.

The inductor contains 350 turns of PEV-2-0,35 wire wound on the same magnetic core. In this case, the operating frequency of generation was equal to 50 Hz. The output power is about 10W. The power of the converter can be increased by replacing the trinistors of the KU201 series with the KU202. With a resistive load, the L1 inductor is not needed.

Author: Semyan A.P.

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:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive The ozone layer is recovering 31.10.2018 A report by the World Meteorological Organization (WMO) states that actions taken under the Montreal Protocol have led to a reduction in the amount of substances that deplete the ozone layer in the atmosphere. At the moment, it is recovering at a rate of 1-3% per ten years, according to the UN website. If the pace continues, the ozone layer should fully recover over the Northern Hemisphere by 2030, over the Southern Hemisphere by 2050 and over the poles by 2060. The Montreal Protocol, signed on September 16, 1987, prohibits the production and sale of hazardous substances that deplete the ozone layer. Ozone protects the earth from ultraviolet radiation, which is the main cause of melanoma and other skin cancers. UNEP (United Nations Environment Program) believes that proper implementation of the Montreal Protocol will help prevent 2030 million cases of skin cancer by 2.

Other interesting news:

▪ Gilded Bow Muscles

▪ Which language is the easiest

▪ Submarine high voltage transmission line

▪ Lifespan biomarker found

▪ A new method of observing the Sun

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Experiments in chemistry. Article selection

▪ article In our country only the dead know how to love. Popular expression

▪ article Which river - the Volga or the Kama - should be considered a tributary from a scientific point of view? Detailed answer

▪ article Gravitational clock. Children's Science Lab

▪ article Electrical insulating materials. Parameters of electrical insulating materials. Encyclopedia of radio electronics and electrical engineering

▪ article Refinement of the table lamp power regulator. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

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

www.diagram.com.ua
2000-2024