Charger from laptop adapter. Homemade laptop charger for Asus eeepc How to make a car charger for a laptop

For those who travel for long periods of time, it is important to know whether you can charge your laptop in the car. Yes, it is possible to do this, you just need to know some subtleties. The procedure is carried out from the cigarette lighter, and thanks to this there is no need to wait until the equipment is charged from the outlet at home.

How to charge a laptop in the car? This process will not be difficult for any computer owner.

Cigarette lighter charging

A car laptop adapter is considered an important thing for a business person, especially for someone who is constantly driving. Equipment discharges at any time, and there are not outlets everywhere. This means that in order to constantly have access to a computer, you need to use modern tools.

How to charge a laptop in a car using the cigarette lighter? Connecting to the named source will be sufficient for the operation of your equipment. But the voltage of the device is not 220 V, but less. Therefore, you need to use a special adapter that converts voltage and supplies electrical current with the necessary parameters.

Operating from the mains, it also has such a device. The network parameters are not suitable for the type of current that the power supply requires, so the converter is considered its main component. The adapter has a similar operating principle.

Features of chargers

Chargers have different characteristics. The back panel of the equipment contains information about what output voltage is suitable for the equipment. As a rule, this indicator is 15-25 Volts, and the current is 4-5 Amperes. This information must be taken into account when choosing an adapter.

Power supplies have different connectors, since each equipment has its own types of outputs. Therefore, it is advisable to choose a device from the same manufacturer as your laptop. Another characteristic is the properties of the cigarette lighter. The output voltage is 10-12 Volts, and the truck's is 25 V. Chargers are not suitable for every vehicle.

Is it harmful?

Not everyone knows that you can charge a laptop in a car. It won't harm the car, but what about the laptop? How does this affect technology?

There is an opinion that you should not connect a laptop computer to the cigarette lighter, since the power supply here is completely different when compared to a regular power supply. This is true, but this is precisely why the adapter is used. And if you choose a device that is suitable for all its properties, then you can easily charge your laptop while traveling. And on the road there will be no problems with this.

Charger Specifications

It is better to consult a specialist on how to charge a laptop in the car. To do this, it is advisable to contact electronics stores. They sell car power supplies from different manufacturers, suitable for specific ones. Each charger has its own parameters, and they are tested before being put on sale.

Let's continue to figure out how to charge a laptop in the car. To recharge, you need to use a car inverter - in the car it will serve as a 220 V outlet for your laptop. In principle, it can be used for any technique. In general, an adapter connected to a laptop computer through the cigarette lighter is considered the most convenient charging option, since it consumes little energy and is safe.

Standalone device

If it is not entirely clear how to charge a laptop in a car, then you should familiarize yourself with the principle of operation of the transport adapter. Its power is kept within 150 W. Therefore, it is necessary to choose a device that is protected from overload. Charging occurs with the ignition on, that is, with the engine running, since when the converter is connected to the cigarette lighter, the battery quickly runs out.

You need to purchase a stand-alone adapter with the same number of Volts and Amperes as on the equipment’s power supply. Better yet, as we have already said, buy a device of the same brand as the computer. The charging process lasts about 3 hours, while the phone can be charged in an hour.

Purchase

Often in the assortment of specialized stores you can find universal devices that help solve the problem of how to charge a laptop in a car. The said set usually contains at least 4 adapters. When purchasing, you need to check if there is a suitable connector. The cost of universal devices ranges from 500 to 2,000 rubles.

But no matter which adapter you choose, it is connected in the same sequence - one end of the charger is connected to the cigarette lighter, and the other (with a suitable adapter) to the laptop.

If the store does not have a device with a suitable connector, then you should contact the dealer network of your laptop manufacturer. But the original charger costs more - about 2,000-2,500 rubles.

When choosing, pay attention to some nuances:

• There must be protection at the junction of the wire and the connector. If it is missing, then this is where the wire will break.
• Wire length. In all cars the cigarette lighter is located in different places. Therefore, it is advisable to buy a charger with a long wire that can be adjusted.

It should be taken into account that high-quality devices have special protection against short circuits. The remaining characteristics do not matter, so the product can be anything in appearance, design and weight. If you buy a suitable charger, you can always infect your laptop in the car. This is very convenient, because the equipment can work on the go.

19.02.2013

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Finally got around to considering the question: How to charge our favorite toys such as phones, cameras, mp3 players in extreme cases when the original charger is missing?

I would like to immediately make a reservation that I am not a shaman or Kashpirovsky, I was unable to charge the battery with the power of thought, and therefore I will say right away: for charging, in any case, you will need another source of electrical energy output voltage greater than battery voltage * , from where we will pump energy into the battery of our device.

*You can, of course, charge with a source whose voltage is lower, but this will require a converter that will increase the voltage - I will also consider this option in this article.

ATTENTION : Improper charging and operation of batteries can lead to complete failure of the battery (device), or significant loss of capacity, explosion, etc. and so on. The article is written purely for informational purposes. DO NOT REPEAT!!!

Lithium-ion (Li-ion) batteries are most often used in mobile devices (laptops, mobile phones, PDAs and others). This is due to their advantages over the previously widely used nickel-metal hydride (Ni-MH) and nickel-cadmium (Ni-Cd) batteries.

I will not describe the device and operating principle of this type of battery, because... The Internet is full of descriptions. I would like to briefly note just one point:

Commercial Li-ion batteries have the most advanced protection of any battery type. As a rule, the Li-ion battery protection circuit uses a field-effect transistor switch, which opens when the battery cell voltage reaches 4.30 V and thereby interrupts the charging process. In addition, the existing thermal fuse, when the battery heats up to 90 ° C, disconnects its load circuit, thus providing its thermal protection. But that's not all. Some batteries have a switch that trips when a threshold pressure level inside the housing is reached, equal to 1034 kPa (10.5 kg/m2), and breaks the load circuit. There is also a deep discharge protection circuit that monitors the battery voltage and breaks the load circuit if the voltage drops to 2.5 V per cell.

So let's start with the simplest:

The easiest way: use another charger with similar characteristics. Here we may encounter the following difficulties:

• Connector mismatch

This problem is easily resolved in devices with a round connector and is much more difficult with flat connectors.

Let's look at this method in more detail from the practical part:

So: according to the conditions of the problem, we have a phone, a charger from another model, the connector of which does not fit

In this example, I used a piece of tubing from a ballpoint pen. As you can see, through simple manipulations, we were able to charge the motorola phone using a charger from nokia

1) Insert the wires into the phone connector

2) Connect the second ends of the wires to the connector from the charger

The task has been achieved, charging has begun

p.s. A few hours later, the phone showed 100% charge.

It is much more difficult to adapt a phone where the input connector is not round, but in many cases this method also works. I’ll tell you how I did it a little later...

Let's consider the second case, which is just as easy to solve as in the first case: Laptop needs to be charged There are a lot of laptop chargers around, but the connectors don’t fit..

In many cases, it’s even easier here than with phones. Almost all laptops (at least those laptops that I have encountered) have a circular connector

The table shows several types of connectors that I came across:

Let's consider option: option 1 and the simplest situation: the diameter of the central contact on the laptop is smaller than the diameter on the charger. In this case, the charger will be freely inserted into the laptop connector, but there will be no charging, because there will be no contact. In this case, the problem is solved simply: several strands are taken from a thin stranded wire, inserted inside the hole on the connector that comes from the power supply and connects to the laptop. If the output characteristics of the power supply are suitable for your laptop, then charging will begin immediately.

Wire strands are inserted into the connector

Important: It is necessary to monitor the temperature at the connector connecting the power supply to the laptop, because in case of poor contact, overheating is possible, which can lead to damage to the connector on the laptop, then repairs will be required by disassembling the laptop.

If the connector heats up due to poor contact, you should increase the number of wires that are inserted inside the connector.

The second important point: you need to pay attention to the correct polarity, the polarity of the connection is usually indicated both on the laptop and on the charger, as a rule, “+” is the central terminal, but there may be exceptions, so it’s better to be safe

Another simple way to determine the polarity of the connection for a specific model, if you have the Internet at hand, then ask a search engine. For example, for my laptop, I found a lot of pictures when I asked: “ Toshiba satellite charger pictures"

And one more thing, I would like to additionally draw your attention to one point: usually a sticker is stuck on the back of the laptop indicating the parameters that are required from the charger, for example this sign:

those. in this case, a charger with an output voltage of 19 Volts is required and the output current must be at least 3.16A.

For charging, the output voltage is more critical, although a slight variation is allowed; in practice, I will say that the laptop that I tested worked quite normally and was charged at the lower voltage value of 16 volts, and I tested the upper limit at 22 volts.

As for the output current from the power supply, the maximum parameter is usually indicated, i.e. If you only charge without turning on the laptop, then the parameter can be 2-3 times lower.

Regarding all the parameters, I will soon take additional measurements and publish them.

Let's consider a similar case, only we have the opposite, the diameter of the central wire on the charger is smaller than the diameter of the central wire on the laptop.

In this case, we do exactly the same as we did with the phone at the very beginning, we find a suitable handset and use pieces of wire to build an adapter, all this will look something like in the pictures below

Here the field for imagination is not limited; 2 pieces of wire and an empty refill from a helium pen were enough for me:

With some simple manipulations we get something like this:

which we insert into the laptop connector

If you press the wires to the table with tape, for example, and do not move the laptop, you can not only charge, but even work while the laptop is charging :)

So, we looked at the simplest methods, when, according to the conditions, we have almost everything we need (a charger suitable for the parameters), we only needed to adapt the connectors.

Little by little I will move on to more complex conditions.

We will consider situations where you have to remove the battery to charge.

Having an external charger at your disposal can easily charge the batteries of many devices.

For example, I came across this device:

Let's look at the characteristics

As you can see, the output voltage range is quite large from 4.2 to 8.4 Volts

First task: determine the polarity on the terminals, which can be solved in many ways

Second task: connect the charger terminals to the battery terminals

Here I will look at the example of the following battery:

For example, I used a piece of cardboard, two wires and a piece of electrical tape, which I used to wrap the contacts attached to the cardboard around the battery:

A glowing red LED in this example means that charging is in progress.

If the article turned out to be useful, you have questions or do not agree with this article, please. Thank you.

as they say: to defeat the enemy you need to know him from the inside)

Let's now try to charge the laptop battery without a charger. After searching for information about the battery design and not finding anything, I decided to disassemble the battery pack. Let's see what it consists of:

Toshiba satellite laptop battery

Let's see what kind of animal it is :)

As can be seen from the characteristics, the voltage is 10.8 Volts, the capacity is 4Ah, i.e. theoretically it can be charged from a car battery with a voltage of 12 volts

As can be seen from the photo, the battery unit firstly consists of 6 separate elements, which are connected in pairs in parallel, and the resulting 3 elements are connected in series.

The most difficult thing is to understand the connection diagram, which is intertwined with electronics. those. The question is, which wires to connect to so as not to turn the battery into a brick and also provide charging?

Here is the connector itself, where I’ll try to apply current to ensure the battery is charged

A safe, but long and tedious way is to charge each pair of elements separately, you do not need to solder the elements, you need some kind of current source with a voltage of 4 to 8 volts and it is advisable to use a ballast, you can use any charger for Li batteries.

And I wanted to quickly go over:

At the first place

• I need to charge my laptop but the charger is broken*

Probably the best advice: Repair the charger or purchase a similar but working one

In second place:

• I need to charge my laptop, I have a desktop computer*

Unfortunately, the power supply produces stabilized 12 V, 5 V, there are other voltages, but 12 volts is not enough to charge the laptop

Here you can consider the option of either getting inside the power supply and doing the alteration, to increase the output voltage, you can also assemble a converter with 12 for example 19 volts (perhaps closer to winter I’ll try to test it in practice and of course I’ll share the results) or using a voltage of 5 V through ballast resistor to charge the elements separately - as described in the last case.

• Yes: The device that needs to be charged, there is a charger from another device that matches the characteristics but the connector does not fit.

Below is a method for temporarily restoring a broken wire from a charger

It is difficult for a modern person to do without a computer. Today people do not part with electronics even in the bathroom. What can we say about long-distance travel, in which you need to look at the weather forecast, road map on your laptop and, out of habit, stay in touch on social networks. It’s bad that the laptop battery doesn’t last more than an hour, and you can’t plug it directly into the car’s cigarette lighter socket. To power a laptop or netbook, a voltage of 19 V is required, with a current of 4–5 A.

You will have to assemble a step-up converter from 12 to 19 volts. Since the maximum load current reaches 5 A, a low-power voltage multiplier is indispensable. Exactly powerful inductive-pulse converter 12/19 V , for example, assembled according to the diagram below, is needed to power a laptop.

Adapter parts

The heart of the converter is microcircuit KR1006VI1 . The switching frequency of 40 kHz of this RS register is set by capacitor C3. The circuit has protection against input voltage reduction. Because if it drops below 9 V, then the inductor, trying to maintain the specified output voltage, will work at the limit, and an abnormally high current will flow through the VT2 power switch.

There is also protection against increasing the output voltage above 25 V. An abnormal increase in voltage can be observed when the feedback line in the circuit is broken. Which is not dangerous for a laptop, but catastrophic for the converter.

Throttle L 1 with an inductance of 25 μH, you need to wind it yourself on a toroidal magnetic core of size TN27/15/11. A coil like the one in the photo, covered with a yellow plastic shell, is available in any computer power supply.

It is necessary to wind only 9 turns of 25 μH, when using the specified coil with a diameter of 27 mm. PEV-2 wire with a diameter of 1 mm is ideal for winding. It should be evenly distributed throughout the magnetic circuit.

To rectify the pulse output voltage you need Schottky diode VD 2 and electrolytic capacitor C5 with a capacity of 100–220 µF. From a faulty computer power supply, you can borrow an assembly of two Schottky diodes of the MBR4045PT type, in which they are connected in parallel. This is a very powerful assembly, designed for current up to 40 A at low voltage up to 45 V, so the Schottky diodes will never heat up while the laptop converter is operating.

In the output switch of the converter, to provide a large supply current, a powerful field transistor VT 2 , such as in the diagram or you can remove the T60N02R from the motherboard.

All other parts of the laptop adapter can also be replaced with domestic or imported analogues.

Converter setup

To test the output of the converter, you should connect a string of resistors with a total resistance of 5 Ohms and a power of at least 50 W. Now you can check whether the circuit maintains the voltage within 17–20 V at a load current of 4–5 A.

After this setup, you can connect most LCD monitors powered by 19 volts via the adapter. In case of organizing a cinema in the car.

Assembling the device

It is convenient to place the finished device for the machine in the case of a faulty computer power supply. Most of the elements are located on its circuit board. Since the source of field-effect transistor VT2 is also its body, it should be insulated with mica or synthetic film when installed on a radiator.

At full load, the transistor on the heatsink becomes warm. Cooling can be enhanced by using the fan in the computer unit. This cooler is connected from the factory through a thermistor installed close to the radiator. The resistance of the thermistor at room temperature is about 400 Ohms; as the temperature increases, it decreases and the fan begins to rotate faster.

All that remains is to connect the cigarette lighter plug to connect to the vehicle's on-board network.

The circuit is also available at //radiokot.ru/circuit/power/converter/45 and on the author’s website //microscheme.blogspot.ru/2011/03/blog-post.html

Automotive throttleless power supply based on IRS2153 for laptops and mobile phones External USB connector in car radio Connecting the mobile phone to the radio DIY USB socket for car

Many people have a car, and almost everyone has a laptop. There are situations when you need to power or charge its battery in a car, but then the question arises: HOW?

Powering the laptop from the car impossible, since the on-board voltage is only 13.5 volts (on average). It is to solve this problem that a do-it-yourself voltage converter will come in handy.
The diagram of this simple homemade product is presented below.

The current reserve of this circuit is 8 amperes, at a voltage of 19 volts. At a time when any modern laptop consumes no more than 4 amperes, there is a decent supply.

Let's look at the parts used and the principle by which this converter works. Its heart is the UC3843 microcircuit (a generator with pulse-width modulation and a comparator for stabilizing the output voltage) in a typical configuration. The muscles are the inductor L1 and the assembly of field-effect transistors VT1 (IRF7341); in my case, P1203 was used, soldered from the motherboard of a laptop. The small dimensions of the device are achieved by using surface-mounted parts and a high conversion frequency (150 kHz according to R2 C2 elements). The increased voltage is pumped at the inductor L1 and the Schottky diode VD1 of the rectifier. The inductor is wound on a standard yellow-white ring from a computer power supply. The number of turns is 20 - 25, with a 1.5 mm wire (it is more convenient to wind with a 0.6 wire folded in three). Diode VD 1 is used from the same block as the ring. And it is marked F2020CT. If desired, you can get another output voltage; for this you need to select resistor R9.
A little about possible replacements and design features.

As I already said, instead of the IRF7341 matrix, a field-effect transistor P1203 is used, but you can use something simpler, such as IRFZ48N, IRFZ44N, IRFZ34N; from domestic transistors, KP727B, KP723, KP746, any of the KP812 series, or another powerful N-channel are suitable field worker

Structurally this homemade The converter is made on a circuit board, 5 by 4 centimeters. Of course, it was possible to etch the printed circuit board, but there was little time, that’s why it was like this.