What Is Wireless Power Transfer?

Wireless Power Transfer is the electrical power can be transferred from a source to a device without using any Wire Connections.

Near Field Technique:

  1. Inductive Coupling
  2. Resonant Inductive Coupling
  3. Air Ionization

Far Field Technique:

  1. RF/Microwave Power Transmission
  2. Laser Power Transmission

Applications of WPT:

  1. Moving targets such as fuel free airplanes, fuel free electric vehicles, moving robots and fuel free rackets.
  2. Automatic wireless charging for mobile robots, cordless tools and instrument which eliminates complex mechanisms and labor-intensive manual recharging and battery replacement.
  3. Another application of WPT are solar power satellites, energy to remote areas, broadcast energy globally.
  4. WPT are used for Ubiquitous power source, RF power Adaptive Rectifying Circuits (PARC).

Future Wireless Power Transfer Technologies:

Future Wireless Power Transfer Technologies are Real Wireless Power, long range wireless power delivered without cables, batteries, line-of-sight, or charging pads.

The RF It is acting as WiFi, but it doesn’t transfers data instead of this it transfers power. The receivers are installed into the devices and which can be communicated by using radio, ultrasonic, optical, laser or other types of signals to catch the transmitting signals. This communication between device (receiver) and transmitter happens 100x/second. All these devices will transfers and receivers power simultaneously.

Drawbacks of Inductive Technology:

Just imagine never again having to bother wired stuff the device for recharge, but this solution is already exists with inductive charging with using charging pads. Inductive work only on few inches as well as it requires the devices should be equipped with the technology to be set down on a charging pad. As well as RF techniques can transfers targeted power to safely to the devices at longer distances up to 30 ft (9 m) without cables.

How it works?

The system consists of two main chips i.e. a tiny receiver and a larger transmitter. The receiver establishes routes to the transmitter by sending it RF signals at a rate of a hundred per second. These RF signals can bounce off walls and objects but are blocked by living organisms such as people.

Comparison of Inductive and RF power transfer technologies

Wireless charging techniqueUsabilityEffective charging distanceEfficiency Cost
Inductive power transfer techniqueSafe for humans, simple implementationFrom a few millimeters to
a few centimeters
5 watts of power, up to 120 wattsLow
RF power transfer techniqueLong effective charging distance, suitable for mobile applicationsTypically within several
tens of meters, up to several kilometers
70% more power is delivered High

Challenges of WPT:

Main challenge of wireless power transfer is power loss, while transferring the wireless power there is a huge problem of power loss so we can provide the following solutions to overcome this problem

  1. Antenna Beam-forming  
  2. Efficient Power Amplifiers
  3. Phased Array