Wireless Electric Vehicle Charger: Revolutionizing How We Power Up

Polo Lu
on
July 30, 2024

As the use of EVs increases, there is a growing focus on creating better charging solutions to meet the rising demand, one of which is wireless EV charging. Wireless charging works through a process called magnetic resonance, which transfers electricity…

As the use of EVs increases, there is a growing focus on creating better charging solutions to meet the rising demand, one of which is wireless EV charging. Wireless charging works through a process called magnetic resonance, which transfers electricity across an air gap from one magnetic coil in the charging pad to a receiver coil fitted to the vehicle. This process begins automatically when an EV equipped with the appropriate technology parks over a charging station. 

In BecoEV, we focus on the development of wireless EV charging technology, giving you and efficient and fast charging experience along with a broader charger compatibility of electric vehicles.  Consumers are showing more interest in how this technology can easily integrate into their everyday lives, indicating a move towards a simpler and more intuitive way to interact with electric vehicles.

Basics of Wireless Electric Vehicle Charging

Principles of Inductive Charging

Inductive charging operates on the concept of magnetic resonance. When an alternating current flows through a coil (the transmitter) in the charging pad, it creates a magnetic field. A second coil (the receiver) in the EV picks up this magnetic field and converts it back into an electrical current which then charges the battery. The alignment between these coils is crucial for efficient energy transfer.

Key Elements of Inductive Charging:

  • Alternating Current (AC): The source of power for creating a magnetic field.
  • Magnetic Field: Generated by the transmitter coil, this carries the energy wirelessly.
  • Receiver Coil: Converts the magnetic field back into an electric current to charge the battery.

Components of Wireless EV Chargers

Wireless EV chargers consist of two main components: the transmitter pad that is typically installed on the ground (for example, in a parking space) and the receiver pad located on the underside of the vehicle.

Transmitter Pad:

  • Primary Coil: Where the alternating current is applied to create a magnetic field.
  • Power Electronics: Manage the flow of electricity and conversion to create a suitable alternating current.

Receiver Pad:

  • Secondary Coil: Captures the magnetic field and converts it into electrical current.
  • Rectifier: Converts the alternating current into direct current (DC) suitable for battery storage.
  • Communication System: Ensures alignment and proper charging conduct by communicating with the vehicle.

Types of Wireless EV Chargers

Wireless electric vehicle (EV) chargers are categorized based on their operation while the vehicle is parked or in motion.

Static Wireless Charging Systems

Static wireless charging systems are installed in parking spaces and charge EVs when they are parked over the charging pad. They often use inductive charging technology, which requires the vehicle to be aligned with the charging pad to transfer energy through electromagnetic fields.

Dynamic Wireless Charging Systems

A problem for electric vehicle users are running out of battery while driving. Dynamic wireless charging is the solution to this problem, by integrating this system, it opens the possibility of letting electric vehicles (EVs) charge while driving over special pads built into the road. Vehicles can stay charged without needing to stop frequently, making the driving experience smoother without worrying about low battery health.

Installation and Integration

For wireless EV chargers to work properly and safely, careful installation is essential. The installation process begins with choosing an ideal location ensuring the location and system can go hand in hand and integrating it smoothly with the existing infrastructure. A well-executed installation helps prevent issues like interference or power disruptions, it also helps with the visual factor in the city landscape. Ongoing maintenance is also key to keeping everything in top condition, so your charger continues to function safely and effectively for years to come.

Site Selection

When choosing a site for a wireless electric vehicle charger, several key factors are taken into account. Proximity to the main power supply is a priority to help reduce installation costs. The site should ideally have flat, stable surfaces to ensure the charging pad makes proper contact with the vehicle.  It’s also important to follow regulations and beware of areas susceptible to floods in order to make sure the charger runs smoothly, safely, and without unnecessary costs.

System Setup and Testing

System Setup:

  1. Installation of Ground Pad:
    • Evenly place the pad where the vehicle’s parking position aligns with the charger.
    • Securely anchor the pad to the ground to avoid displacement over time.
  2. Connecting the Wall Unit:
    • Install the wall unit at a place within reach of both the power supply and the ground pad.
    • Run necessary cabling between the ground pad and the wall unit while adhering to electrical codes.

System Testing: They rigorously test the system to confirm successful energy transfer between the ground pad and the vehicle. Safety checks are performed to detect any electrical faults.

During checks you should check the system’s power efficiency and connectivity. Power efficiency makes sure the charger delivers the correct output to meet the vehicle’s charging needs. Connectivity ensures that the vehicle is properly aligned with the charging pad for a consistent and uninterrupted charge. 

Advantages and Challenges

Although wireless charging for electric vehicles is changing the EV charger industry by offering a more convenient and seamless experience, but new technology comes with its own set of advantages and challenges that need to be considered.

Convenience and Aesthetics

With wireless electric vehicle charging, drivers can effortlessly charge their cars by parking over a designated pad. This gives drivers and vehicle owners the luxury of reducing the time and effort needed to plug in cables and cords This technology also enhances the look of parking spaces by not using long cables, allowing a more pleasant visual appeal in the city.

Efficiency and Compatibility

The technology has made strides in charging efficiency, with some systems achieving parity with conventional wired chargers. However, ensuring compatibility across different brands and models of electric vehicles remains a challenge, which necessitates standardized solutions.

Cost and Infrastructure Requirements

The investment funds required to set up wireless charging stations can be expensive at first because of all the necessary technology and infrastructure. Thinking about it  in the long term, the initial investment cost can help free up space for other infrastructure in the future.

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Polo Lu

General Manager Jiangsu Lutong Electric Co.,Ltd