Charger for 3-6V batteries. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
Comments on the article
The proposed charger is designed to charge with a stable current, first of all, miner's batteries, popularly referred to as "horse racing". The self-discharge of these batteries is very high. And this means that after a month, even without load, this battery needs to be charged. The device is easy to modify for charging 12-volt batteries, it is suitable (without modification) for charging 6-volt batteries. The charger circuit is very simple (see picture).
The rectifier and transformer are not shown in the diagram. The secondary winding provides a current in the load of more than 3 A at a voltage of 12 V. A bridge-type rectifier on D242A diodes, a filter capacitor - 2000 μFx50 V (K50-6). Field-effect transistor type KP302B (2P302B, KP302BM) with an initial drain current of 20-30 mA. Zener diode VD1 type D818 (D809). Transistor type KT825 with any letter. It can be replaced with a Darlington circuit, for example, KT818A and KT814A, etc. Resistor R1 type MLT-0,25; resistor R2 type PPZ-14, but it is quite suitable with a graphite coating; R3 - wire (nichrome - 0,056 ohm / cm). Transistor VT2 is placed on a ribbed heat sink with a cooling surface of about 700 cm1. Electrolytic capacitor C2 of any type. Structurally, the circuit is made on a printed circuit board located near the transistor VTXNUMX.
To charge 12-volt batteries, it should be possible to increase the AC voltage by 6 V on the secondary winding of the mains transistor of the charger.
This circuit was used in the same way as a prefix to the power supply (a non-stabilized voltage source is also suitable).
The advantage of this circuit is that it is not afraid of short circuits in the output, since it is actually a stable current generator. The magnitude of this current depends primarily on the bias, which is set by the variable resistors R2.
The circuit is similar to switching on with a common base in audio frequency power amplifiers. Sometimes transistors like KT825 go into generation mode. Therefore, with a long conductor leading from the base of the transistor VT2 to the engine of the resistor R2, an additional resistor with a resistance of up to 1 kOhm should be included. It is soldered directly to the base tap of the transistor VT2.
Author: A.G. Zyzyuk, Lutsk
See other articles Section Chargers, batteries, galvanic cells.
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 Ultraviolet for myopia
12.12.2016
Scientists from JAMA Ophthalmology compared the medical history of more than three thousand people living in various European countries, from Norway to Greece. All of them were on average 65 years old, and several hundred of them suffered from myopia.
The researchers asked everyone about their diet, income level, past illnesses and a host of other things - among other things, the respondents were asked to indicate how much time per day (more precisely, from 9 am to 5 pm) they spent outside the home starting at the age of 14. At the same time, their blood was taken to analyze the level of vitamin D (which, as we know, is synthesized in skin cells under the influence of ultraviolet radiation).
Knowing, at least approximately, how much time a person spends outdoors, and knowing in which geographical area he lives, it is possible to calculate the amount of ultraviolet radiation that he received on average every day throughout his life.
It turned out that those who received large doses of ultraviolet radiation in their youth were less likely to have myopia - by the age of 65 they saw better than others who had not received UV radiation at one time. It would be logical to assume that the whole point is in that very vitamin D, especially since, according to some sources, the higher its level, the lower the likelihood of myopia. However, this time, no such pattern could be found: the level of vitamin D did not correspond in any way to whether the person’s eyes were healthy or not.
It can be assumed that UV rays act differently; some of the earlier research suggests that ultraviolet light specifically activates eye cells and regulates the growth of the eye so that it becomes resistant to myopia. However, no matter how tempting the "ultraviolet prophylaxis" of myopia may look, all these dependencies and regularities need to be repeatedly rechecked.
One cannot speak of a causal relationship between one and the other, all we know is that the two parameters - the amount of ultraviolet light and the likelihood of myopia - are somehow related to each other. It is also worth noting that the authors of the work judged by the dose of ultraviolet radiation, based on the memories of the study participants, how much time they spent in the sun forty years ago, and such data still cannot be called accurate enough.
|
Other interesting news:
▪ Hydrogen passenger train
▪ Current/Power Monitor Chip
▪ Insomnia leads to diabetes
▪ Alcatel OneTouch POP7 and POP8 tablets
▪ Atomic transistor
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ site section Chargers, accumulators, batteries. Article selection
▪ Caravel article. History of invention and production
▪ article Do ants smell? Detailed answer
▪ article Operation of the dryer nozzles. Standard instruction on labor protection
▪ article Meter of total conductivities of broadcasting antennas of LW and MW bands. Encyclopedia of radio electronics and electrical engineering
▪ article Transceiver YES-93. Encyclopedia of radio electronics and electrical engineering
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese