We charge the laptop battery from the mobile phone charger. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

 Comments on the article

As a result of the rapid development of technology, portable computers are becoming lighter and smaller. But the same cannot be said for their chargers. In terms of size and weight, the charger is already comparable to the computer itself, which causes significant inconvenience to use the computer while traveling. The author of the proposed article managed to remake a light and small-sized mobile phone battery charger for recharging a laptop battery. The alteration is so simple that it is accessible even to novice radio amateurs. It is important that, if necessary, the converted charger can also be used for its original purpose.

By the nature of my work, I have to travel a lot, using the ASUS M5200 laptop. Unfortunately, the laptop battery quickly runs out at the most inopportune moment. It is very inconvenient to carry its charger with you because of the very thick power wires, in addition, its weight is about a third of the weight of the laptop (1,5 kg), and in terms of volume it occupies almost half of the volume of the laptop itself.

Therefore, it was decided to use a small-sized charger for a mobile phone. A small-sized widespread SAMSUNG charger model TAD037EBE has been selected and improved. It has an output voltage of 5 V with a current limiting threshold of 0,7 A, i.e. its maximum output power is only 3,5 W, although the applied TNY266P chip can deliver up to 10 W in a completely closed non-ventilated case. Studies of the laptop battery have shown that its final voltage in a fully charged state at a charging current of 0,5 A and normal temperature does not exceed 15 ... 15,5 V. Therefore, altering the charger is reduced to increasing its idle output voltage to 16 V, reducing the current limit and replacing the output connector X1. The scheme of the charger and its changes in the process of alteration are shown in fig. 1, the reference designations of the elements correspond to the marking of the printed circuit board.

Fig. 1

To increase the output voltage, it is desirable to increase the number of turns of the secondary winding of the transformer T1. But it turned out that it was impossible to disassemble the transformer without damaging it. It was possible to increase the output voltage of the device in a different way: by changing the operating mode of the parallel stabilizer IC3, which was achieved by replacing the parallel-connected resistors R19 and R22 with a higher resistance resistor R25 (27 kOhm in the author's copy), shown by thickened lines. With this method of increasing the output voltage, one should be aware of the increase in voltage at the output transistor of IC1, but the operation of the device for several months has proven that the transistor can withstand the increased voltage well. Resistor R15 was removed to reduce the current limit threshold. After that, the threshold dropped to 0,45 A.

The redesigned charger charges even a completely discharged laptop battery overnight.

Fig. 2

If it is necessary to preserve the device's former function - charging the battery of a mobile phone, then an additional resistor R26, a switch SA1 and a connector for connecting to a mobile phone X2 are installed in the device case, as shown in Fig. 2. The position of the contacts of the SA1 switch is shown in fig. 2 for laptop battery charging mode: open-circuit output voltage of 16V is supplied to connector X1. The other position of the switch contacts SA1 corresponds to the charging mode of the mobile phone battery. In this case, a resistor R25 is connected in parallel with the resistor R26, the resistance of which is selected so as to set the open-circuit output voltage of 5 V at the X2 connector. For greater clarity, in Fig. 2 shows that the positive for both connectors is the center conductor.

Note. Oxide capacitors C6 and C7 in the laptop battery charging mode operate at the limit of permissible voltage. It is advisable to replace them with others with a voltage of at least 20 V.

Author: Yu.Ivanov, Minsk, Belarus; Publication: radioradar.net

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 HEP-100/150/185 - power supplies for harsh environments 26.11.2015 If you are looking for a fanless power supply capable of continuous operation in the temperature range of -55...+70°C, in an environment with high humidity, dust and high vibration, then the new series of power supplies HEP-100, HEP-150 and HEP-185 from Mean Well. New power supplies have an output power of 100, 150, 185 W, respectively, an extended input voltage range of 90...305 V, increased efficiency (94%) and the ability to work at altitudes up to 5000 meters. The new power supplies are manufactured in an aluminum case with compound casting in two versions: with the possibility of manual adjustment of the output voltage (IP65) and without voltage adjustment (IP68). All power supplies have a power factor correction circuit (>0,95). In terms of electromagnetic compatibility, the power supplies meet the requirements of EN55022 (CISPR22) for class B, have protection in the input circuit against short-term impulses of increased energy with an amplitude of up to 6 kV and a warranty period of 6 years. These power supplies are designed for industrial equipment operating in harsh environments in telecommunications, oil and mining industries, as well as for outdoor advertising and architectural and decorative lighting. Main technical parameters: Output power 100, 150, 185 W; Output voltage from a range: 12, 15, 24, 36, 48, 54 V; Operating mode: voltage stabilization; Power factor >0,95; Efficiency up to 94%; Temperature range -55...+70°С; Input voltage range 90...305 V; Vibration resistance up to 10G; IP65/68; Protection against impulses up to 6 kV; Protection against short circuit, overload, overvoltage and overheating; 6 year warranty.

Other interesting news:

▪ Olympic video recorders

▪ Invincible bacteria discovered in Antarctica

▪ Thecus N2810 Pro NAS

▪ Increased the effectiveness of explosives

▪ The baby's cells stay in the mother's brain

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Infrared technology. Article selection

▪ article Vanity of vanities and all kinds of vanity. Popular expression

▪ article Who are the Vasiliev brothers? Detailed answer

▪ Portier's article. Job description

▪ article Upgrade columns. Encyclopedia of radio electronics and electrical engineering

▪ Article False shuffle from hand to hand (seven ways). Focus secret

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