Electric screwdriver from the battery charger. Installing the power supply inside the battery case

Can an electric screwdriver be plugged in from the charger

Electric screwdriver is convenient for its ubiquity. independence from limiting wires makes it possible to get into hard-to-reach areas. A set of two power modules allows you to power one while working with the other. However, each battery pack has a finite number of charge/discharge periods, failing once they are used up. In low-cost tools, the blocks break down faster, and the user gets a gadget with a functioning motor, but no power. That’s when the dilemma arises of “can an electric screwdriver be plugged directly into the charger?

Feed such an electric screwdriver can be fed by connecting it to the mains through the power hub, because its motor works at 220 volts.

Features of the electric screwdriver device

Electric screwdriver and its main parts: 1. chuck; 2. torque control; 3. direction of rotation switch; 4. start and stop button of electric motor; 5. battery pack housing; 6. motor shaft rotation speed switch; 7. a latch for holding the battery with the tool

Product Information. The advent of the conventional battery tool for quick screw fitting was spurred on by the advent of the compact cylindrical battery. In 1982. the first prototype was exhibited at the fair in Dresden (GDR). At that time, the interesting homemade device was looked at and admired. Price was a problem. It cost up to 500 Deutsche marks (GDR). At that time it was believed that not every user would dare to buy such a thing for continuous use.

Few would have guessed that already 20 years later the price for such a tool would be quite affordable. Later they would be bought by home craftsmen for mechanization of work in everyday life.

To modify the tool it would have to be disassembled, so it is useful to know the inner workings.

Internal construction of an electric screwdriver: 1. electric motor; 2. start button, combined with reverse; 3. battery pack; 4. gearbox; 5. clutch for torque adjustment; 6. chuck

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To disassemble it is necessary to unscrew the screws with which the two halves of the housing connect the product into a single whole. You have to put the screwdriver blade back to back and open the halves. All assembly is performed on the part where the screws are installed.

When assembling it is necessary to check the position of the protruding elements. You may need additional ways to fix the moving parts.

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Other ways to feed

The unit is inside

The solution to the problem “can an electric screwdriver be plugged in through the charger” could be an alternative way to power an electric screwdriver. installing the power supply in the empty housing of the power tool.

Before you begin, it is necessary to prevent overheating of the unit, for which you must arrange in advance the holes in the housing, which will provide air movement, heat dissipation. Continuous work time with an electric screwdriver with such an improvement is advisable to reduce to 15 minutes.

You buy a ready-made unit, it is chosen according to the size of the housing, the technical indicators. The pulsed version of the module is the most suitable for use, it is small-sized, lightweight. Not recommended the use of modules of domestic production of the last century. they have a large volume at a low efficiency.

Unsuitable batteries are removed from the bed, and the power supply unit is put in their place. Contacts are energized, the housing is closed. Assembled hybrid gadget is ready to work from mains.

  • Wires can be lengthened for convenience.
  • It is necessary to monitor the quality of the assembly: the design should not be able to touch the metal elements, otherwise the short circuit will not avoid. It is best to leave some space between the transformer and the board, which will have a positive effect on cooling.
  • If any parts of the construction are strongly heated, it is possible to install modules that dissipate excess heat, or to arrange ventilation slots.

With your own hands

For users with special knowledge, skills, it will not be a difficult problem “whether you can power the electric screwdriver from the charger without special tools”, t.к. The power supply can be assembled with your own hands. The power module, assembled according to the circuit, is inserted into the housing in place of the damaged elements. The outgoing voltage is measured, the wires are plugged, and the housing is locked.

Tip: The circuit may need an additional load, which can be provided by adding a 15W light bulb to the system, which also provides backlighting.

A computer module will also work

Another solution to the problem of powering an electric screwdriver. mounting it to a computer power supply. This option applies to such modules, which are equipped with a mechanical lever. The positive aspect is that the unit is cooled by a cooler, protected from exaggerated loads by a built-in special system.

Such assembly is organized only with the use of power modules for 300-350 W and current of 12 volt, not less than 16 A. For tools with a voltage greater than 14 volts this power supply option is not valid.

The user may want to hide an unaesthetic unit in a beautiful case; then it is recommended not to forget to arrange ventilation in it.

Car charger

Looking for a solution “Is it possible to connect an electric screwdriver to the charger”, you can stop on the charging by car AK-block. Modules with manually-adjustable current, voltage. Connection is absolutely easy. it is enough to connect the input channels of the tool motor with the contacts of the car charger.

General recommendations

All of the above methods include one unifying stage. disassembly of the power module housing. If the frame is attached to the bolts, then it is not a problem, mount on the glue requires careful opening of the seam by tapping on the gap with a hammer, buried in it a knife.

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When installing, the direction of voltage must be respected. it must not be applied to the battery. Therefore, the module is mounted in parallel with the power contacts, in the plus line is built in a diode illuminator for a certain power.

Summary: the question “can an electric screwdriver work from the charger” is in the affirmative, and a few solutions, but requires caution, some scientific knowledge and skill.

Electric screwdriver with an autonomous power supply, is clearly one of the best inventions of mankind, and it greatly facilitates the life of almost the entire mu.

indispensable helper in the household. a cordless screwdriver. the tool will be with you everywhere, but it works exactly until the battery runs out, but the number of charge cycles it has is limited, even from idleness the battery can go bad. Batteries live about three years, and at the end of that time you will have to replace them. It is possible to save the tool by converting it from cordless to corded, and there are various ways to do this.

How to convert an electric screwdriver to work from the mains

Let’s consider available options for modifying the tool, which can cope people who are somehow familiar with electronics. can hold a soldering iron in his hands and measure the voltage with a multimeter.

Conventional battery charger

You can not connect an electric screwdriver for mains power through a battery charger. The charger is designed to power the battery, and its current is lower than the battery’s output. Therefore, the motor will rotate slowly, will develop dozens of percent of the original power due to the lack of supply current. An attempt to stop the rotation of the chuck of a screwdriver or screwing fasteners will lead to a sharp increase of current: from 1,2-2 A to 6-20 A, the device works within the limits of possibilities.

Charging from a laptop to power an electric screwdriver

The easiest way to power an electric screwdriver with a 220 V mains supply. Laptop chargers give out 12-19 V. Be sure to estimate the power reserve. For example, a 19-volt battery with 3.2 amps would be too much for a 12-volt motor with a load of 1.3 amps.

The instructions are the simplest. In the absence of a soldering iron you can do without twisting wires, although it is recommended to refuse.

Important! The other banks should be left in the battery case, they serve as a balancer. It is uncomfortable to hold a screwdriver without elements even with two hands. it will bend to the side of the cartridge.

Computer power supply instead of the battery of an electric screwdriver

Most unnecessary, but working power supplies form factor ATX are able to provide the motor of an electric screwdriver with electrical energy. At the beginning, the approximate calculations. The 12-volt battery has a starting current of 18 A. To start the motor you need 216 W of power. you need a 220-240 W power supply. In one hour it is reworked using a soldering iron and measuring tools.

The computer power supply solution has a couple of drawbacks:

  • The electronics won’t fit in the battery case of an electric screwdriver, the stuffing will have to be left in the metal case of the power supply.
  • The design is sensitive to dust, and when repairing the power supply will have to be protected separately from small debris without interfering with cooling.
  • The device will noticeably increase in weight.

Before starting the modification you need to check the functionality and reliability of the solution.

  • The PSU case can be taken apart with a Phillips screwdriver.
  • Connect the green wire in the output bundle with any black wire in the same bundle.
  • Connect the device to the mains.
  • Use a tester to measure the potential difference between the yellow and black conductors of the bundle.

If it is equal to 12 V with minor fluctuations, everything is all right.

  • The plug is cut off.
  • Yellow and black wires are connected in parallel by 3 or 4 pieces. twisted.
  • The green starter wire is shorted to the black wire.

The result is a 12-volt DC power supply with a decent current load.

Sometimes at low speed. start button is not pressed completely, circuit is unstable: power unit turns off. protection triggers.

You can turn the PSU off and on, or you can include an LC-filter in the circuit. It will smooth out the interference that occurs between the PWM controllers of the motor start button and the power supply.

In practice, the picture is different. three capacitors, a resistor and an improvised coil.

To make the work more convenient, it is necessary to assemble the device intelligently, so that nothing was hanging and the tool was convenient to use.

  • The battery is disassembled and all components are removed from the case.
  • Together they mount the LC-filter.
  • From the power supply cut off unnecessary output wires, all but the green if the PSU will be used only to power an electric screwdriver.
  • It is soldered to the black on the same connector.
  • Short pieces of copper cable are soldered to the common conductor and the 12V wire.
  • Through the terminal, connect to the cord that leads to the plug.

All that’s left is to assemble the housing and test the operation of the device.

Important! The length of the cord should not exceed 1.5-2 m. If you use a longer cable, the percentage of energy dissipation will increase

It allows you to quickly turn your electric cordless screwdriver back into a cordless screwdriver after you buy the battery.

Powering an electric screwdriver from a car battery charger

Alternatively, it is also possible to use a battery charger for automotive and other batteries as a secondary power source for the electric motor of an electric screwdriver. They are usually adjustable. with a function to switch the voltage and current output. Car chargers are chosen based on the specified on the battery of an electric screwdriver plus ~ 30%.

For connection, the charging terminals are connected to the battery terminals of the electric screwdriver, observing the polarity. It is wise to solder pieces of wire to the pins of the tool, and connect the other ends to the alligator clips of the battery charger.

How an electric screwdriver works with a car battery

Powering the electric screwdriver with the vehicle battery

The electric motor of the tool can be powered from the battery of the tractor, car and other equipment, where there is a voltage regulator.

  • As is the case with the car battery charger, two conductors are soldered to the terminals of the electric screwdriver, such as spare wires with crocodiles cut off.
  • Other ends of wires are stripped by 3-5 cm, bent by hooks and fixed to the battery terminals, for example, clamped by nuts or clamps.
  • After setting the desired current parameters you can work. Remember to observe the polarity.
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Chinese power supply board as a power source for an electric screwdriver

We are talking about an adapter with a voltage of 24 and a current of 9 A. enough for powerful screwdrivers requiring a voltage of 18 V. You can buy the board in electronics stores or order it directly from China. Consider the example of a popular model.

First of all a constant resistor is replaced by a variable one. a regulating resistor.

How to convert a cordless screwdriver to work from 220 volts?

Methods of remodeling a cordless screwdriver to work from the mains vary in complexity, most often it is necessary to connect the electric screwdriver directly to the charger. Connecting the battery charger from a laptop requires almost no knowledge for the installation of computer power supply unit need to be friendly with the soldering iron, and to reconfigure the Chinese unit master should be able to handle measuring tools. Be aware that the native power supply of an electric screwdriver is not usually designed in order to connect an electric screwdriver directly, its power is designed only for charging the battery. When you connect the electric screwdriver to the native charger directly, it can barely spin, t.к., It’s obviously not enough current. An electric screwdriver has a current consumption of about 2A at idle, with 12 volt power, if you try to stop it, the current draw will increase from 7 to 20A, take it into account when choosing a power adapter. If you don’t want to lose torque, you need a proper power supply.

Using a power supply from an old laptop

The laptop battery is quite suitable for the introduction of a power supply for an electric screwdriver.

  • Completely disassemble the body of the electric screwdriver. Remove old source, disassemble wires with soldering iron.
  • Connecting the wiring of the new unit to the wiring of the old unit that held the previous one. Observe polarity!
  • After activating the “start” button, check the electric screwdriver for proper operation, as well as the correct connection.
  • The body of an electric screwdriver has a hole where the plug is placed for charging. Not only does the tool now run on 220v, but it also recharges like a notebook (computer).
  • A new power supply unit is installed in the middle with adhesive.
  • Other housing components can be put back into place. That’s it, you can get to work!
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Car battery

A battery can be a great option for an electric screwdriver, especially when you are working away from the mains. To realize what you have in mind, you need to disconnect the clamps from the working tool and plug it into the “battery”. Warning! Continuous use of the power supply is not recommended!

Welding inverter

To turn an old design into a power supply, you need to do some improvement, namely to add a secondary coil. The advantage of an inverter, compared to a laptop battery, is immediately apparent. Design makes it possible to get the desired output voltage. The method is good for those who know about radio engineering.

Creating a transformer coil

There is also another technology for transforming the apparatus into a mains appliance. Based on the production of a mobile power supply. An elastic wire is connected to the screwdriver, on the opposite side of which is a plug.

True, you will need to make a separate power supply or take a ready-made transformer, equipped with a rectifier. It is important that its parameters coincide with the characteristics of the tool.

It will be difficult for an inexperienced person to make transformer coils with his own hands. There is a chance of making a mistake in the number of turns and the selection of wire diameter, so it is not recommended. Today there are many appliances, in which the right transformer is already built in. It is only necessary to choose a suitable one and make a rectifier for it. Semiconductor diodes are used for soldering of the rectifier bridge. Their parameters must match the device.

Options for making a power supply

There are several options on how to convert the screwdriver to work from the mains. The task is to power the electric motor of the device with the help of an intermediate source.

Using a laptop charger

To make a 12 V power supply for a screwdriver with your own hands is possible, even without technical knowledge. It is only necessary to find an unnecessary charger from a laptop, which has specifications similar to the parameters for powering a screwdriver. The main thing is that the output voltage corresponds to the desired one (12-14 volts).

In order to achieve this goal it is first necessary to disassemble the battery and remove the defective elements from there. This is followed by the following manipulation:

  • Take the battery charger from a laptop.
  • Cut off the output connector, bare and tin the wire ends.
  • Striped wires and solder to the battery input wires.
  • Insulate the soldering points to avoid short circuits.
  • We make a hole in the case, so as not to squeeze the wire and assemble the construction.

The base. the power supply from a computer

To make this device you will need a block from a personal computer of format A. Т. It is not difficult to find, this is an old model of the power supply, which is easy to buy at any market of radio components. It is important to know that you can use a 300-350W unit with a current of 12 V at least 16 A.

Exactly AT format blocks meet these parameters. On the body of this device is a power button, which is very convenient when working. A cooling fan is installed inside and an overload protection circuit is mounted.

The order in which the unit is rebuilt:

  • Let’s take off the lid of the B housing. П. Inside we will see a board with many wires going to the connectors, as well as a fan.
  • The next step is to turn off the power protection. Find the green wire on the big square connector.
  • Connect this wire to the black wire from the same plug. You can make a jumper from another piece of wire, or you can just cut it short and leave it in the case.

Then in the outputs bunch find the smaller connector (MOLEX) and do with it the following steps:

  • We leave the black and yellow wire and cut the other two short.
  • For the convenience of the PSU location during operation, solder the extension cord to the black and yellow wires.
  • Attach the other end of the extension cord to the contacts of the empty battery compartment. This should be done by soldering, you can make a good twist, it is necessary to observe the polarity.
  • Make a hole in the housing, so as not to squeeze the wire during assembly. The device is ready.

If you feel like refining your design, t. е. to hide it in another case, drill holes for air intake to prevent the PSU from overheating.

Power from the car charger

With a car battery charger, it’s pretty easy to make a device to power a screwdriver. To make the conversion, you only need to connect the power terminals of the battery charger output to the electric motor power.

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If an infinitely variable output voltage charging unit is available, it can be used as an 18 volt power supply for a screwdriver.

Safety Precautions

After converting the appliance to mains power, safety and operating procedures must be followed:

  • Keep the device intermittent every 30 minutes to extend its life and avoid malfunctions.
  • It is not recommended to work higher than two meters.
  • It is important to periodically clean the unit’s power supply of dust.
  • Check the condition of the power cord. It should not be overloaded or susceptible to moisture and other negative factors. Ignoring this rule can lead to a short circuit of the device.

If you follow these simple guidelines, you can keep your old screwdriver longer than the new one but still keep its power and ease of use.

How to remake with your own hands

Before you convert an electric screwdriver, you must clearly determine how much power and what voltage the tool needs to work. This is what we will have to base our decisions on.

It is important to choose a power supply that is not too big and relatively light, so as not to make working with an electric screwdriver completely inconvenient. If the unit is to be installed directly into the electric screwdriver itself, it is important to keep the dimensions.

Then the body of the tool is opened. The two halves of the body can be fastened with screws or glue. A knife can be very helpful for disassembly.

After opening the case, the power supply or wire is inserted inside, the contacts of which must be soldered to the charger. Soldering should be as efficient as possible, using special solutions.

The other end of the wire should be for mains feeding. So there should be a plug. It is recommended to make a hole in the housing in advance, through which the cable will pass.

Homemade power supply can be obtained in several ways. In any case, you will get a full-fledged tool, which can be used to perform work after connecting to the mains. It is desirable to prepare a circuit beforehand, which will help you to avoid making mistakes when creating the block.

Reworking a Chinese-made power supply

To achieve the goal it is necessary to replace the original resistor R10 with a tunable resistor, with which you can achieve the desired voltage. This is done in several steps:

  • The permanent resistor is taken out;
  • in its place is inserted a pre-prepared adjustable resistor, on which the resistance will be set to 2300 ohms;
  • In the meantime, the voltage is still 24 V;
  • Find the required voltage at the pins by adjusting the resistor.

After all these manipulations, you must check that the output voltage is the right value (12V, 14V, etc.).д.) and that the current exceeds 9 A.

Conversion of a commercially available power supply

You can also use any other commercially available power supply. The remaking process in this case will be almost the same, but in addition to the resistor, you may need to solder additional diodes. The most important thing is to achieve the necessary output parameters. And this can easily be done with a combination of components.

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After modification it is important to ensure a good air flow to the power supply box. To do this, holes are drilled out. You should not allow the device to overheat.

Using a laptop charger

An excellent option is to use a laptop charger. Such devices usually work with voltages from 12 to 19 V. This is quite enough to make the electric screwdriver work well. But you should not neglect the output current. The closer it is to the required one, the better.

In this case, conversion of an electric screwdriver to power from the mains is reduced to the elementary soldering of wires from the charger to the board in the tool. It is desirable to insulate everything with tape or other similar materials. After that, the wire is led out and the tool can be used.

Power supply from a computer

You can make an electric screwdriver from the mains using an unnecessary power supply from a computer. There are many varieties of such devices, but almost all of them will fit an electric screwdriver. The necessary wires can be identified by color by referring to the manufacturer’s website.

Computer power supplies offer durability, advanced overload protection and a host of other benefits. They may not be too handy because of their size, but a long wire will help solve this problem.

The procedure for connecting a computer power supply to a screwdriver:

  • disassemble the unit;
  • Remove the power protection by disconnecting the green wire from the board;
  • this wire must be connected to the black connector on the device;
  • separate all wires except for the yellow and black ones;
  • These two wires are soldered to the extension cable;
  • The other end of the cable is connected directly to the screwdriver;
  • All exposed contacts are insulated if possible.

Thus, from the computer device you will get a power supply for a 14 volt electric screwdriver.

Power from the car charger

Power supplies converted from car battery chargers are also quite common. The principle of conversion is approximately the same as for a computer power supply, but there are a few peculiarities.

The main feature is that such devices usually allow easy adjustment of voltage and current. This greatly simplifies the procedure of use, and also allows you to apply the method for all screwdrivers.

Using car chargers comes down to a few simple steps

  • You need to prepare special wires that will connect the power supply and the electric screwdriver;
  • the edges of the wire are stripped and inserted into the terminals on the tool (for better retention, you can use clamps);
  • When connecting, it is necessary to observe the polarity, which is usually marked on the fixtures or the wires themselves;
  • Now all the connections are carefully fastened and insulated.

After all these procedures, the user will get a functional electric screwdriver, which is able to work from 220 volts.

All of the above methods are effective enough to create a mains tool from a cordless. But do not forget that in this case, the mobility of an electric screwdriver will be significantly reduced, which may affect the quality of work. But if the battery is out of order, and the work needs to be continued urgently. it is logical to connect an external power source.

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