Inductive charging (also known as wireless charging or wireless charging) is a wireless power transfer. It uses electromagnetic induction to power portable devices. Inductive charging is also used in vehicles, power tools, electric toothbrushes and medical devices.
Imagine a future where driverless shared electric vehicles (EVs) stop when you leave a building, take you to your destination, and continue driving passenger after passenger without having to stop to recharge the battery. Instead, electricity generated by nearby wind and solar resources is wirelessly transmitted from the road to the vehicle while driving.
Eliminating the need to park for charging will allow electric vehicles to drive truly autonomously, and because the vehicles can continue to be used for more hours, fewer vehicles will be needed to meet passenger demand. Additionally, EVs with dynamic (dynamic) wireless charging can be equipped with smaller batteries, an option that could reduce costs and accelerate adoption.
While the concept of mid-range wireless power transfer (WPT) using near-field (non-radiative) electromagnetic coupling has existed since the seminal work of Nikola Tesla (1891) more than a century ago, the technology that enables efficient dynamic WPT is very important for electric vehicles. It’s still in its infancy. Numerous challenges related to performance, cost and safety need to be overcome before the vision of wirelessly powered electric vehicles can be realized.
1) Capacitive Wireless Charging System (Cwcs)
The wireless transfer of energy between the transmitter and receiver is achieved by displacement currents caused by changes in the electric field. Instead of magnets or coils as transmitter and receiver, coupling capacitors are used here for wireless transmission of power. The AC voltage is first supplied to the power factor correction circuit to improve efficiency and maintain voltage levels and reduce losses when transmitting power. The H-bridge is then supplied to generate a high-frequency AC voltage, which is applied to the transmitting plate to generate an oscillating electric field, and a displacement current is generated on the receiving plate through electrostatic induction.
2) Permanent magnet gear wireless charging system (PMWC)
Both the transmitter and receiver consist of armature windings and synchronous permanent magnets within the windings. Operation on the transmitter side is similar to motor operation. When we apply an AC current to the transmitter winding, it creates a mechanical torque on the transmitter magnet, causing it to spin. Due to changes in the magnetic interaction in the transmitter, the PM field induces a torque on the receiver PM, causing it to rotate synchronously with the transmitter magnet. Changes in the permanent magnetic field of the receiver now generate alternating current in the windings, i.e. the receiver acts as a generator feeding mechanical power to the receiver PM where it is converted to electrical output at the receiver windings. Couplings that make permanent magnets rotate are called magnetic gears. The alternating current generated at the receiving end is rectified and filtered by the power converter and fed into the battery.
- Inductive wireless charging system (Iwc)
Wireless charging allows electric vehicles to be charged without being plugged in. It wouldn’t be a good thing if every company made its own standards for wireless charging systems that aren’t compatible with other systems. Therefore, in order to make the wireless charging of electric vehicles more humane, many international organizations such as the International Electrotechnical Commission (IEC), the Society of Automotive Engineers