Let’s start with conventional history because you have to understand where power came from. So power, basically it comes in two different energies. One is fossil fuels and the other one is renewable energies. Renewable energies like from the Sun, Wind and Power. So fossil fuels can be Wood, Coal, Steam and Electricity. Wood has been used from the very beginning by the people. Whether they are using it for light or they’re using it to cook food or they’re using it to make heat. Same with the coal, coal is used to create light or to make heat. Steam is when you use liquid and you warm it up and it makes some vapors. And so what happened was throughout history, we had inventors who used these basic fossil fuels and created technologies that would empower every day uses. One of the things with the steam is the steam engine. Coal which we use them in generators to generate electricity.
Finally is electricity, everything was started with Ben Franklin when he had the kite and the key attached to it and the lightening hit it. That might have been the start of him understanding how to harness energy, but really it started with Michael Faraday. Michael Faraday is the first inventor, who actually understood an electric current being passed through a magnet and a copper wire. Thomas Edison is right close behind him with the creation of the light bulb. He also had the creation of the direct current which allowed the factories to make power and that would generate the electricity and other sources to a close vicinity. George Washington then did the alternating current, which is just more of an extension of the direct current and made the power go out farther than what Thomas Edison could do. And then, we’ll talk a little more about Nikola Tesla, he also did the alternating current and then also had the vision for wireless technology.
One of the things when it comes to using our fossil fuels is global warming. We use more fossil fuels it decreasing them and it’s also causes problem with the global warming situation. Some of the things that are trying to make it better is the energy policy, which is giving them only the amount of energy that people can use, but that’s not being done now. And also how things need to be changed using Solar and Wind power systems.
The evolution of wireless power transmission
Nikola Tesla, late in the 1800’s and early 1900’s, his vision was to use giant coils to transmit power wirelessly through the air. It’s basically through the troposphere which is the lower part of the earth’s atmosphere, to power homes around the world. Because of this idea, his funding was pulled by his financial backers because they didn’t know of a way to meter that power use.
We’ve got advantages and disadvantages of both wired and wireless technology.
Wired power transmission Disadvantages:
Some of the disadvantages are power loss because of the resistance to the wires themselves and the amount of raw materials taking up the wires. The power loss due to resistance is estimated at about 26%. The raw materials, mainly copper, copper supplies are dwindling in the world and unsightly mess of wires.
Wired power transmission Advantages:
It’s more reliable than wireless. The technology is known and we are comfortable with it. The infrastructure is in place in much of the developed world.
Disadvantages of wireless power transmission:
The wireless technology is not known to most consumers. The health risks are unknown, could be cancer-causing. There needs to be more research done. The current technology only allows transmission across small distances.
Wireless power transmission Advantages:
Remote areas can be allowed to access the wireless power. There’s no cords, no wires, nothing to trip over. And also there’s the potential for higher efficiency than wired technology.
Types of Wireless power transmission technology
- Radio Frequency: Power cast of Pennsylvania, has build a system capable of extracting small quantity of power from radio frequency signal in the 902 MHz and 928 MHz range. The potential for this technology is trickle charging battery operated devices like cell phones, laptops, sort of things.
Disadvantage is the interference caused by metal surfaces.
- Induction: These are where portable devices are placed on charging pads to recharge by inductive Coupling between the pad and the electronics within the device. A company by the name of Splash power has created a charging mat for portable recharging devices.
The disadvantage is that only a few of these devices are available in the world today, it is emerging but very slowly.
- Adaptive Inductive Coupling: This technology is intelligent enough to manage varying loads on its secondary coil, so it allows the configuration to change where the conduction is most effective. A company by the name of Visteon uses this technology; they created a drawer inside of a car for recharging portable devices.
- Microwaves: This requires a microwave source and an antenna. The current size of the transmitter and receiver limit this technology. Microwaves suffer diffraction over long distances. The receiver and the transmitter have to be huge to handle that. This technology is cost prohibitive due to the size and equipment costs.
Obstacles to overcome:
Is wireless power transmission compatible with biology and ecology?
That’s what needs to be looked at and studied. For Current regulatory guidelines more research is needed to be done. They can be a cancer causing agents. Unknown side effects cannot be evaluated in a lab setting. We’ve heard of technologies that have been put out and then later on they’ve been determined to cause other issues.
Current applications of wireless transmission and how do current applications of wireless power transmission work?
Wireless power is divided into two categories. They are low-power transmission and high power transmission. A few examples of low-power transmission are Remote controls, Game controllers, headsets, sensors. Examples of high-power transmission are everything from computers, laptops, televisions, digital photo frames.
Watch a video on how exactly the wireless power transmission works
and please take a time to watch Duracell Powermat
How Wireless power transmission work
Let’s learn about it in a simple way, Run an electric current through a coil of copper wire and the coil will produce a short-range magnetic field place a second coil within this field and an electric current will flow through it the magnetic field has transferred electrical power from one coil to the other this principle is called induction and it has been understood for more than a century.
Induction is what charges a wireless electric toothbrush for example and it works well over extremely short distances. Hold the coils apart and the power transfer ceases it turns out that the trick to longer distance power transfer is the same principle opera singer uses to shatter a wine glass from across the room it’s called residents. For the opera singer when the frequency of the Sound wave matches the unique resonant frequency of a glass, the acoustic energy is converted to kinetic energy at the highest possible efficiency. The energy then build inside the glass until it shatters. The coils that electricity uses to transfer power wirelessly are magnetic resonators.
First a rapidly oscillating electric current is applied to a coil at specific resonant frequency. This creates a magnetic field in the region around the coil and it tunes a second coil to the same resonant frequency as the source and it will couple. Resonating anywhere within that region and converting the oscillating magnetic field into an electrical current within the second coil. This response is called highly coupled magnetic resonance and it hasn’t been done before.
By attaching the second coil to a device such as the battery of an electric car or a mobile phone, this current can be made to do useful work. The source can be either centimeters or meters away from the device being powered and can deliver power through walls or around metal obstacles. The power can even be distributed across multiple devices at once. So by a simple trick of physics, power is transferred wirelessly.
The Future of Wireless Power Transmission
Changes in daily activities-people and devices will start acting differently and your power and data will be received differently. We can conserve our natural resources, no more coal, no more fossil fuels. We can even sustain on energy.
There are some cool things that are going to happen in the future like as we know about the electrical car, you go plug it in somewhere. One coolest thing that I’ve found, an electrical shoe that generates electricity from your shoe to any device that’s on your body. We can even transmit power from the sun to satellites in the sky, giant transmitters on Earth to receivers on central storage units. And then it’s supplied to every house, every school and every device in the world.