How to make a magnetic induction battery charger

Warning: We do not recommend experimenting if you are not familiar with polarity sorting and delicate handling of mobile devices, or if you cannot do this with a new and expensive mobile phone with a fully charged battery intact!

It is not strange to have a smartphone and we all need it when we are out and about or traveling. It is the only way to stay connected with your friends, family and the community. So it’s important to have him ready to connect with everyone. For this you need to have a constant power source so that you can charge your mobile phone whenever you need it, it will charge quickly.

But the fact is, you can’t have a power source everywhere. So it might be a great idea if you can charge your phone using a wireless magnetic charging pad. If this is your first time hearing about it, you can follow these steps to familiarize yourself with the process in detail.

Grab an old cell phone that you can use on the go or keep it as a spare and turn it into a magnetic charger by following a few simple steps below:

Things you will need

  • Scissors
  • 4 magnets
  • Hot glue
  • Welding gun
  • Small pieces of threads

Important steps

  1. Remove the back cover of the mobile phone to reveal the battery area of ​​the mobile phone, then remove the battery as well. Make sure your mobile is not connected in any way to any other accessory or charging port.
  2. After removing the cover and the battery, remove some screws that keep the mobile’s internal structure safe. When you remove them, you will be able to pull the inner circumference or the entire inner structure in front of you to see through it.
  3. Find the micro-USB charging port and check its polarity with a multimeter. You will be able to spot the positive and negative polarity very easily.
  4. Take the small wires and connect them to the correct polarity, such as red to positive and black to ground. Solder the wires very carefully as if you don’t you may damage your mobile.
  5. Make two marks on the back of the cover with the port connected to the wires to remove the wires correctly. You can make them with hot pointed wire or a thin wand.
  6. In addition to these holes, medium sized holes are also needed on the back cover, approximately the size to which two small round magnets can be attached. You can do this with scissors.
  7. Remove the cables from there and reassemble the phone with the cables carefully pulled out of the holes.
  8. Connect the two wires to the magnets that you will place in the larger holes. You will need to solder them carefully and never heat the magnets as this will destroy their magnetic ability.
  9. Your phone is now ready to be charged with a magnetic power bank made up of the other two magnets of the same size.
  10. Take the two magnets you have and connect them with a USB cable and attach them to the foam plate for a portable magnetic power bank, or hot glue two magnets on the table to create a charging station to charge your mobile phone.

The conclusion

Make sure you are able to sort the poles and put the magnets in the right position, as you can only put the opposite poles overlapping, otherwise it will be rejected, so keep that in mind when hooking up. Inoltre, usate la pistola saldante con attenzione, senza surriscaldare nessuno degli elementi, perché il cellulare e i magneti non sono molto adatti alle alte temperature e dovreste assolutamente tenerli lontani da temperature estreme. In case you are not sure about carrying out the whole process, you should take help from expert who may know the technical aspects so that you don’t have to ruin your mobile.

Learn how to wirelessly charge your iPhone with Qi-certified charging accessories.

What you need

Your iPhone 8 or later has built-in wireless charging which allows for easy and intuitive charging.

  • iPhone 12
  • iPhone 12 mini
  • iPhone 12 Pro
  • iPhone 12 Pro Max
  • iPhone SE (2nd generation)
  • iPhone 11
  • iPhone 11 Pro
  • iPhone 11 Pro Max
  • iPhone XS
  • iPhone XS Max
  • iPhone XR
  • iPhone X
  • iPhone 8
  • iPhone 8 Plus

Learn more about charging with a MagSafe charger and MagSafe Duo.

Twój iPhone współpracuje z ładowarkami z certyfikatem Qi, które są dostępne jako akcesoria oraz w samochodach, kawiarniach, hotelach, na lotniskach i w meblach. Qi is a universal and open charging standard developed by the Wireless Power Consortium (WPC).

There are many Qi-certified chargers on the market that charge your iPhone with the latest version of iOS up to 7.5 watts. Questi caricatori sono disponibili presso l’Apple Online Store e i negozi Apple.

Other Qi-certified chargers may vary in functionality and performance. If you have any questions, please contact the manufacturer.

Wireless charging

  1. Connect the charger to the power supply. Use the power supply that came with the accessory or the manufacturer’s recommended power supply.
  2. Place the charger on a flat surface or other location recommended by the manufacturer.
  3. Place iPhone display facing up on the charger. For best performance, place it in the center of the charger or in a location recommended by the manufacturer.
  4. Your iPhone should start charging a few seconds after placing it on the wireless charger.

How to make a magnetic induction battery charger

You should see in the status bar.

Find out more

  • Wireless charging uses magnetic induction to charge your iPhone. Do not put anything between the iPhone and the charger. Supporti magnetici, custodie magnetiche o altri elementi tra il tuo iPhone e il caricabatterie possono ridurre le prestazioni o danneggiare le strisce magnetiche o i chip RFID, come quelli che si trovano su alcune carte di credito, badge di sicurezza, passaporti e portachiavi. If your case holds any of these sensitive items, remove them before charging or make sure that they aren’t between the back of your iPhone and the charger.
  • If your iPhone isn’t charging or charging slowly and your iPhone has a thick case, metal case, or battery case, try removing the case.
  • If your iPhone vibrates, for example after receiving a notification, your iPhone may reposition itself. This can cause your iPhone’s charging pad to lose power. If this happens frequently, consider turning off vibration, turning on Do Not Disturb mode, or using a case to prevent movement.
  • Depending on the charging pad you have, you may hear slight noises while your iPhone is charging.
  • Your iPhone may get a little warm while charging. To extend battery life, if the battery overheats, the software may limit the charge to more than 80%. Your iPhone will recharge when the temperature drops. Try moving the iPhone and charger to a cooler place.
  • Your iPhone will not charge wirelessly when connected to USB. If your iPhone is connected to the computer via USB or connected to a USB power adapter, your iPhone will be charged via the USB connection.

Information about non-Apple products or third-party websites that are not controlled or tested by Apple is provided without recommendation or approval. Apple is not responsible for the selection, operation or use of third party websites or products. Apple does not guarantee the accuracy or reliability of third party websites. Please contact the supplier for more information.

New technologies make our life easier nowadays. Life changed rapidly with the advent of cell phones. This is a radio engineering dream. Mobile phones connected to landline systems. Nowadays, many improvements have been made to cell phones.

These advances provide many services such as SMS, Internet, etc. But while there are a lot of advances in technology, we still rely on wired chargers. Each phone will have its own designed charger. Therefore, chargers need to be taken everywhere to maintain a battery backup. Now think of a charger that automatically charges your phone. When you sit down for tea and put your phone on the table, it just charges. This article describes a simple wireless battery charging circuit that charges the phone when placed near the transmitter. This circuit can be used as a wireless power transmission circuit, mobile wireless charging circuit, wireless battery charging circuit, etc.

Principle of wireless charging circuit:

This circuit works mainly by mutual inductance. Power is transferred from the transmitter to the receiver wirelessly according to the principle of “inductive coupling”.

Inductance is a property of a conductor in which current in one conductor induces a voltage or electromotive force in it or in another nearby conductor. There are two types of inductance. 1) Self-inductance, 2) Mutual inductance.

“Mutual inductance” is a phenomenon in which, when you place a conductor with a current close to another conductor, a voltage is induced in that conductor. This is because when a current flows in the conductor, a magnetic flux is induced in it. This induced magnetic flux combines with another conductor and this flux induces a voltage in the other conductor. Therefore, two conductors are said to be inductively coupled.

Wireless power supply circuitDiagram:

How to make a magnetic induction battery charger

Wiring diagram of a wireless mobile charger

Wireless mobile charging circuit D.design:

The design of the wireless charging circuit is very simple and easy. These circuits require only resistors, capacitors, diodes, a voltage regulator, copper coils and a transformer.

We use two circuits in our wireless charger. The first circuit is a transmitter circuit for generating wireless voltage. The transmitter circuit consists of a DC source, an oscillator circuit, and a transmitter coil. The oscillator circuit consists of two n-channel 540 IRF MOSFETs, 4148 diodes. When direct current is applied to the oscillator, current begins to flow through the two coils L1, L2 and the drain terminal of the transistor. At the same time, the voltage appears at the gate terminals of the transistors. One of the transistors is on and the other is off. Thus, the drain voltage of the transistor, which is in the off state, rises and falls through a reserve circuit consisting of 6.8 nf capacitors and a 0.674 transmitter coil. Therefore the operating frequency is given by the formula F = 1 / [2π√ (LC)].

In the second circuit, i. e. the receiver, it consists of a receiving coil, a rectifier circuit and a regulator. When the receiver coil is placed at a distance near the inductor, AC power is induced into the coil. This is rectified by a rectifier circuit and adjusted to 5 VDC with the 7805 regulator. The rectifier circuit consists of a 1n4007 diode and a 6.8 nf capacitor. The controller output is connected to the battery.

New technologies make our life easier nowadays. Life changed rapidly with the advent of cell phones. This is a radio engineering dream. Mobile phones connected to landline systems. Nowadays, many improvements have been made to cell phones.

These advances provide many services such as SMS, Internet, etc. But while there are a lot of advances in technology, we still rely on wired chargers. Each phone will have its own designed charger. Therefore, chargers need to be taken everywhere to maintain a battery backup. Now think of a charger that automatically charges your phone. When you sit down for tea and put your phone on the table, it just charges. This article describes a simple wireless battery charging circuit that charges the phone when placed near the transmitter. This circuit can be used as a wireless power transmission circuit, mobile wireless charging circuit, wireless battery charging circuit, etc.

Principle of wireless charging circuit:

This circuit works mainly by mutual inductance. Power is transferred from the transmitter to the receiver wirelessly according to the principle of “inductive coupling”.

Inductance is a property of a conductor in which current in one conductor induces a voltage or electromotive force in it or in another nearby conductor. There are two types of inductance. 1) Self-inductance, 2) Mutual inductance.

“Mutual inductance” is a phenomenon in which, when you place a conductor with a current close to another conductor, a voltage is induced in that conductor. This is because when a current flows in the conductor, a magnetic flux is induced in it. This induced magnetic flux combines with another conductor and this flux induces a voltage in the other conductor. Therefore, two conductors are said to be inductively coupled.

Wireless power supply circuitDiagram:

How to make a magnetic induction battery charger

Wiring diagram of a wireless mobile charger

Wireless mobile charging circuit D.design:

The design of the wireless charging circuit is very simple and easy. These circuits require only resistors, capacitors, diodes, a voltage regulator, copper coils and a transformer.

We use two circuits in our wireless charger. The first circuit is a transmitter circuit for generating wireless voltage. The transmitter circuit consists of a DC source, an oscillator circuit, and a transmitter coil. The oscillator circuit consists of two n-channel 540 IRF MOSFETs, 4148 diodes. When direct current is applied to the oscillator, current begins to flow through the two coils L1, L2 and the drain terminal of the transistor. At the same time, the voltage appears at the gate terminals of the transistors. One of the transistors is on and the other is off. Thus, the drain voltage of the transistor, which is in the off state, rises and falls through a reserve circuit consisting of 6.8 nf capacitors and a 0.674 transmitter coil. Therefore the operating frequency is given by the formula F = 1 / [2π√ (LC)].

In the second circuit, i. e. the receiver, it consists of a receiving coil, a rectifier circuit and a regulator. When the receiver coil is placed at a distance near the inductor, AC power is induced into the coil. This is rectified by a rectifier circuit and adjusted to 5 VDC with the 7805 regulator. The rectifier circuit consists of a 1n4007 diode and a 6.8 nf capacitor. The controller output is connected to the battery.

How to make a magnetic induction battery charger

A magnetic coil is made using a conductor, usually insulated copper wire, and wraps it around a core to produce an inductor or magnet. Basically, the conductor through which the current flows creates a magnetic field. However, the use of a conductor only generated a very weak field. Consisting of more than one coil or loop of wire, a magnetic coil focuses on a magnetic field, and each coil of wire provides a small amount of magnetic field. Adding all of these magnetic fields together creates a stronger vector field that actually functions like a magnet. A simple magnetic coil is very easy to make, as long as you have the necessary components for it.

Most of the above items can be easily found at home, with the exception of the magnetic wire and batteries, which can easily be purchased at any hardware store. For safety reasons, make sure you have a suitable place where you can build a magnetic coil, ideally in a workshop, garage or basement.

Step 1: Choose the magnetic core

First you need to have a magnetic core. An iron nail or any other cylindrical piece of iron you choose to use will serve as the base from which the magnetic field will converge and eventually strengthen. There are other types of coils that use air as their core, wrapping copper wire around thin cylindrical paper or wrapping the wire itself into a coil with no core inside. However, this is not recommended if you really want the magnetic coil to work strongly.

Step 2: Wrap the core

How to make a magnetic induction battery charger

Then, after selecting the core, wrap it with a strip of magnetic wire. Remember that the closer the coil is, the better and stronger its magnetic force will be. Then set aside about 6-7 inches of wire dangling from the end of the core. Continue wrapping on the other side of the core.

Step 3: Glue the coil to the core

Using glue or tape, glue the coil to the core. Leave another 6-7 inches of margin and cut the rest of the thread off the roll. This means that you now have two extra strands of wire at opposite ends of the core that you will need.

Step 4: Reveal the thread

Now detach the polish from both ends by burning an inch of polish with a lighter or match. Let it cool for a few seconds and then dry it with a clean cloth. Make sure that both terminal strands are now bare and free of enamel. You now have your magnetic coil.

Step 5: Use a magnetic coil

How to make a magnetic induction battery charger

To use a magnetic coil, connect the coil to an electrical power source. However, it should be remembered that the length of the wire used to build the coil determines the resistance or impedance of the coil and thus how much current will flow through it at a certain voltage. When using the lantern battery as a source, connect the two terminal wires under the coils protruding from the battery. It is then ready to use and you can test it by trying to pick up items such as nails, paper clips, coins, and other small metal objects.

Introduction: Elveet. Kinetic Powerbank Charger

How to make a magnetic induction battery charger

How to make a magnetic induction battery charger

How to make a magnetic induction battery charger

I was once on the road and was having trouble charging my gadgets. I have traveled by bus for a long time, I did not have the possibility to charge the phone and I knew that soon I would be left without communication.

Thus was born the idea of ​​creating a kinetic charger that does not depend on a power outlet.

Whether you need to recharge your gadget while traveling, hiking, on the beach or on the road, Elveet is here to help. You can just shake the Elveet or put it in a bag (backpack) and go to work (hiking, beach, mountain etc.). The device charges as you move.

Elveet is a kinetic charger.
The operating principle of Elveet is based on the phenomenon of electromagnetic induction

Step 1: Elveet components

1. The induction coil consists of a 9-magnet Halbach array and three coils.

2. The board contains a 200mA step-up converter inductor, a battery charger and a battery step-up converter, 5V 2A output.

3. 2800mAh lithium polymer battery.

4. The case consists of 4 parts and is made with a 3D printer.

The entire design is created in Fusion 360.

Step 2: Elveet inductor

The inductor converts the kinetic energy of motion into electric current. The most important parameter is the efficiency of the inductor. The amount of energy stored in the internal battery depends on the efficiency of the induction coil.

An induction coil consists of three coils, a Halbach magnetic array and three diode bridges.
The working field of the coil is the part over which the poles of the magnets pass, that is, the longer this part, the more energy we can get.

Furthermore, the outputs of each coil are connected to a diode bridge, i. e. the coils are voltage independent. And the current from all three coils is summed across diode bridges.
Diode bridges use PMEG4010 very low forward voltage Schottky diodes manufactured by Nexperia. These are the best diodes for such applications and I don’t recommend replacing them with others.

The Halbach magnetic matrix concentrates the magnetic field on one side. On the other hand, the magnetic field is very weak.

The Halbach array requires almost double the number of permanent magnets, but the efficiency of the Halbach assembly is very high.

La scheda magnetica passa attraverso due parti di ciascuna bobina e i poli passano sempre attraverso parti diverse. Since the coils are electrically independent thanks to the diode bridges, the interaction between them is excluded.

The inductor uses the band9 neodymium magnets 5X5X30mm N42. Two more magnets 2X4X30 N42they are used as springs.

The efficiency of an inductor depends on the rate of change of the magnetic field. For this purpose, the path of the magnetic assembly is increased. Thus, the rate of change of the magnetic field is greatly improved due to the high acceleration of the magnetic assembly during movement.

This inductor is much more efficient than an induction coil with a cylindrical magnet in the center of the coil. The cylindrical coil has only an upper and lower working area of ​​the magnet. The central part of the cylindrical magnet is poorly functioning in the current generation. Therefore, its efficiency is low.

The Elveet induction coil has a 4-pole magnetic system oriented strictly perpendicular to the coil wires.

After the diode bridges, the current from the coils is summed and fed to the converter and charger board.

Step 3: PCB Elveet

The circuit and all elements of the plates.
It consists of three main parts:

1. Increase the converter coil current by 200 mA. The NCP1402 chip is used.

It is a boost converter that operates from 0.8V and provides a constant voltage of 5V and a current of up to 200mA. The job of this chip is to provide a comfortable voltage to charge the battery.

2. STC4054 charging device

This system receives a voltage of 5 V from the induction coil or an external source (via micro-USB) and charges the lithium polymer battery with a capacity of 2800 mA. The inductor current and the current from an external source are decoupled by means of Schottky diodes.

Additionally, the second pair of Schottky diodes allows the Elveet to act as an uninterrupted power source, which means you can charge Elveet and receive power from it to your devices at the same time.

3. Step-up output converter. Boost the battery voltage to 5 volts and provide up to 2 amps of current to power your gadgets. In this case, the LM2623 chip works.

The good feature of the LM2623 is the internal high power transistor and the output current up to 2 amps with low ripple of the output voltage. The output voltage is supplied to a standard USB port.

In addition to these parts, there is a touch-sensitive load switch on the board (for example, a strong travel lamp or other permanent loads). There are also output pins for connecting a wireless charger instead of a USB cable, but this option is for the future.

How to make a magnetic induction battery charger

By H. L. Ritter | March 1, 1978

How to make a magnetic induction battery charger

How to make a magnetic induction battery charger

Below are tips on how to build and use a home magnetomagnetic charger.

The solenoid cores are made of mild steel one inch in diameter and three inches in length. They are attached to a 5-1 / 4 x 1-1 / 2 x 5/8 inch steel base and come with 1-3 / 4 x 1-3 / 4 x 5/8 inch rod shoes. All contact surfaces must be absolutely flat and square to ensure good metal contact over the entire surface. Before the wire is wound over them, the magnetic cores must be insulated. The coil can be formed by placing washers of fiber or cardboard around each end of the magnet cores and then wrapping the magnet cores themselves with several layers of electrician’s tape. The winding of this charger is designed to be powered by 6 or 12 V DC from car batteries. Preferably, three layers of double cotton coated magnetic wire n. Wrap the wire around the solenoid cores as shown in the pictures, then wrap the windings with masking tape to hold them in place. Mount the battery charger on a wooden base large enough to also contain the single-pole switch and the connection column.

NOTE, the switch is a must as the charger draws a lot of current from the battery. As a result, the battery tends to emit flammable gases and any sparks around the battery vents can cause fire and / or explosion. Therefore, do not connect or disconnect cables to the battery when the charger is turned on. The windings heat up quickly during use; therefore the switch should only be closed for a few minutes at a time. When a magnet is disassembled for any reason, it must be assembled with the magnets in the same relative position as before, otherwise their polarity may be reversed and the magnet will not work. Magnets should never be left outside the magnet, not even temporarily, without placing a steel bar on their poles as a support. If this is not done, they will quickly lose their magnetism. Re-magnetizing magnetic magnets that have been weakened by prolonged use is a simple process.

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It is important that, unlike the poles of the magnets, the magnets and electromagnets are connected; i. e. the North pole of the magneto magnet to the South pole of the electromagnet and vice versa. To ensure this, the current should be converted to an electromagnet and a magnetomagnet suspended above it by a string. Starting about 12 inches away, slowly lower the magnet. When you start to lower the magnet towards the electromagnet, the magnet will automatically look for the correct polarity as it rotates, so it will be strongly attracted to the electromagnet.

Podczas ładowania umieść magnes na ładowarce po ustaleniu jego polaryzacji i pokołysz go kilka razy w przód i w tył na krawędziach biegunów. Then lay it on its side with the poles away from you and protruding just beyond the furthest edges of the electromagnet’s poles. Put the jumper on the poles of the magnet, turn off the electricity and pull the magnet sideways from the charger. The holder should remain in place until the magnet is reinstalled onto the magnet.

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New technologies make our life easier nowadays. Life changed rapidly with the advent of cell phones. This is a radio engineering dream. Mobile phones connected to landline systems. Nowadays, many improvements have been made to cell phones.

These advances provide many services such as SMS, Internet, etc. But while there are a lot of advances in technology, we still rely on wired chargers. Each phone will have its own designed charger. Therefore, chargers need to be taken everywhere to maintain a battery backup. Now think of a charger that automatically charges your phone. When you sit down for tea and put your phone on the table, it just charges. This article describes a simple wireless battery charging circuit that charges the phone when placed near the transmitter. This circuit can be used as a wireless power transmission circuit, mobile wireless charging circuit, wireless battery charging circuit, etc.

Principle of wireless charging circuit:

This circuit works mainly by mutual inductance. Power is transferred from the transmitter to the receiver wirelessly according to the principle of “inductive coupling”.

Inductance is a property of a conductor in which current in one conductor induces a voltage or electromotive force in it or in another nearby conductor. There are two types of inductance. 1) Self-inductance, 2) Mutual inductance.

“Mutual inductance” is a phenomenon in which, when you place a conductor with a current close to another conductor, a voltage is induced in that conductor. This is because when a current flows in the conductor, a magnetic flux is induced in it. This induced magnetic flux combines with another conductor and this flux induces a voltage in the other conductor. Therefore, two conductors are said to be inductively coupled.

Wireless power supply circuitDiagram:

How to make a magnetic induction battery charger

Wiring diagram of a wireless mobile charger

Wireless mobile charging circuit D.design:

The design of the wireless charging circuit is very simple and easy. These circuits require only resistors, capacitors, diodes, a voltage regulator, copper coils and a transformer.

We use two circuits in our wireless charger. The first circuit is a transmitter circuit for generating wireless voltage. The transmitter circuit consists of a DC source, an oscillator circuit, and a transmitter coil. The oscillator circuit consists of two n-channel 540 IRF MOSFETs, 4148 diodes. When direct current is applied to the oscillator, current begins to flow through the two coils L1, L2 and the drain terminal of the transistor. At the same time, the voltage appears at the gate terminals of the transistors. One of the transistors is on and the other is off. Thus, the drain voltage of the transistor, which is in the off state, rises and falls through a reserve circuit consisting of 6.8 nf capacitors and a 0.674 transmitter coil. Therefore the operating frequency is given by the formula F = 1 / [2π√ (LC)].

In the second circuit, i. e. the receiver, it consists of a receiving coil, a rectifier circuit and a regulator. When the receiver coil is placed at a distance near the inductor, AC power is induced into the coil. This is rectified by a rectifier circuit and adjusted to 5 VDC with the 7805 regulator. The rectifier circuit consists of a 1n4007 diode and a 6.8 nf capacitor. The controller output is connected to the battery.