Electric vehicle wireless charging based on inductive power transmission technology

Recently, the British company HaloIPT announced in London that it has successfully realized the wireless charging of electric vehicles using its latest inductive power transmission technology. This is a technology that may change the direction of the development of electric vehicles. It is reported that HaloIPT plans to establish a commercial-scale demonstration base for this inductive power transmission technology by 2012.

The new wireless charging system of HaloIPT embeds wireless charging pads in underground parking lots and streets, and only needs to be equipped with a power receiver pad to carry out wireless charging.

So far, electric vehicles such as G-Wiz, Nissan LeFon, and Mitsubishi i-MiEV have to be connected to the street car charging station or home plug through a wire to charge. The system uses magnetic fields instead of cables to induce electricity. HaloIPT engineers said that the potential of this technology is huge because inductive charging can also be on the street, which means that electric vehicles can be charged while parked or waiting for traffic lights. In particular, the wireless charging pad can also be placed on various roads, which allows mobile charging of electric vehicles. And, this flexible mobile charging technology is the most effective way to solve the travel problem faced by today's electric vehicles, it will greatly reduce the requirements for battery models.


HaloIPT said that this is also an effective way to deal with the so-called "charge anxiety". With an inductive power transmission system, car drivers do not need to worry about sometimes forgetting to charge electric vehicles.

HaloIPT's wireless charging pad can work under asphalt, underwater or in snow and ice layers, and has a good tolerance to parking displacement. The inductive power transmission system can also be configured to provide power for various road vehicles such as small city cars and heavy trucks and buses.

HaloIPT claims that their charging system supports a larger lateral sensing range, which means that the car's power receiver pad does not need to be placed directly above the wireless charging pad. It is said that the system can also provide a charging distance of up to 15 inches, and even has the ability to identify, for example, when a small object (such as a kitten) interferes with the charging process, the system can also cope.

Although the implementation of this system will be an expensive project, HaloIPT believes that the future of embedded wireless charging system highway will become the development direction of electric vehicles. This is possible and certain, but it is still far from being implemented widely. Nonetheless, HaloIPT ’s motto — “No plugs, no fuss, just wireless” — still gives us hope: One day, electric vehicles will be charged while driving.

About inductive power transmission system

The main power supply is provided by alternating current, which is used to provide voltage to a lumped coil, and the current range is 5 amperes to 125 amperes. Since the lumped loop is inductive, it is necessary to use series or parallel capacitors to reduce the operating voltage and operating current in the power supply circuit.

The power receiving pad coil and the main power coil are magnetically connected. By adjusting the working frequency of the receiving pad coil, it is consistent with the main power coil equipped with series or parallel capacitors, thereby realizing power transmission. A switch controller can be used to control power transmission.

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