Electronic fuse, 6-55 volts 10-600 milliamps. Scheme, description

Free technical library

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

Electronic fuse, 6-55 volts 10-600 milliamps. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network

Comments on the article

Despite the widespread use of integral stabilizers with built-in protection, the need for such devices still exists. The electronic fuse contains few details, operates in the voltage range from 6 to 55 V, selecting a current-measuring resistor, you can change the operation current from 10 to 600 mA.

The scheme of the device is shown in fig. one.

Electronic fuse, 6-55 volts 10-600 milliamps

At rated current, the voltage drop across the resistor R2 is not enough to open the transistor VT1. It is closed, and the transistor VT2 is open by the current flowing through the resistor R1. The resistance of the resistor is selected so that in the operating mode the transistor VT2 is fully open. When the load current reaches the threshold, the voltage drop across the resistor R2 will increase to 1 ... 1,1 V, which, minus the voltage across the diode VD1, will be enough to open the transistor VT1. As a result, the transistor VT2 will close, and the current flowing through the resistor R3 will still more open transistor VT1. The resistance of the resistor R2 is selected depending on the load current.

The electronic fuse is assembled on a board made of one-sided foil fiberglass. Its drawing is shown in Fig. 7.17.

Electronic fuse, 6-55 volts 10-600 milliamps

Transistor KT503E (VT1) will be replaced by KT503D or any others in which the allowable collector-emitter voltage exceeds the output voltage of the stabilizer. If the voltage at the output of the stabilizer is less than 35 V, you can use transistors of the KT503 series with any letter index. Transistor KT972A (VT2) can be replaced with KT972V, KT972G. It should be placed on the heat sink.

Author: Semyan A.P.

See other articles Section Protection of equipment from emergency operation of the network.

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

814 ppi AMOLED display for VR devices 02.02.2018

Specialists from the Chinese company Visionox have created an AMOLED display designed for virtual reality devices. It is characterized by a density of 814 pixels per inch.

The project was funded by Black Cattle Food, a major Chinese food and beverage company, which decided a few years ago to make a career change by divesting related assets and investing in cutting-edge technologies, including AMOLED panels.

814 pixels per inch is quite high. For comparison: Samsung Display commercially produces panels with a resolution of 615 pixels per inch. Last year, the South Korean manufacturer showed a panel with a density of 1200 pixels per inch. In 2016, Sunic Systems produced an OLED display with a density of 1500 pixels per inch. At the same time, the developers of the technology assured that it allows you to get a density of 2250 pixels per inch.

Other interesting news:

▪ Toshiba Canvio Basics portable hard drive

▪ Reusable and erasable ink

▪ Microcontroller ATmega169

▪ Digital home through the eyes of the people

▪ Trap of eternal desires

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the Garland website. Article selection

▪ article by John Gay. Famous aphorisms

▪ article Why is the year of the rabbit also called the year of the cat? Detailed answer

▪ article Traffic Safety Engineer. Job description

▪ article The transition from nuclear to alternative energy is possible and promising. Encyclopedia of radio electronics and electrical engineering

▪ article Magic pipe. Focus Secret

Leave your comment on this article:

All languages of this page

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