As a wireless charging application scenario, car wireless charging can increase driving safety and improve the quality of life of car owners without frequent plugging and unplugging of the charging cable. It greatly improves the experience of using and charging mobile phones in the car, so it is loved by many car owners. The principle of the wireless car charger is to use Ampere's law and Faraday's law to generate an electromotive force in a properly positioned power receiver through the time-varying magnetic field generated by the power transmitter to charge the mobile phone. Mainstream wireless cars are charged in two ways: front-mounted and rear-mounted. Let’s take a closer look!
What is the principle of car wireless charger
The car wireless charger does not need a data cable. You only need to put the mobile phone on the charging stand when charging, and it is very convenient to take it when you use it. So what is the principle of the wireless car charger?
The principles of car wireless chargers are Ampere's Law and Faraday's Law. Ampere’s law means that an oscillating electric field generates an oscillating magnetic field. Faraday’s law means that an oscillating magnetic field generates an oscillating electric field. Wireless charging, that is, a time-varying magnetic field generated by a power transmitter, generates an electromotive force in a properly positioned power receiver.
When charging with a car wireless charger, the power transmitter generates an alternating current through its coil. According to Faraday’s law, the alternating current generates an alternating magnetic field, which is picked up by the coil in the power receiver and converted by the power converter returns the DC current that can be used to charge the battery. The magnetic field has a characteristic, that is, it can pass through any non-metallic non-ferrous materials such as plastic, glass, water, air, etc. Therefore, the charging function can be realized without wires and connectors between the power transmitter and the power receiver. It is the principle of wireless car charger.
What are the ways of wireless car charging
There are two mainstream car wireless chargers on the market:
1.Front-mounted car wireless charger
Front loading refers to the way that the car has a wireless charging device before leaving the factory. It is generally installed in the central storage box and armrest box, and the mobile phone can be charged by placing it on the charging device.
Car front-mounted wireless charging technology comes from wireless charging solutions provided by wireless charging solution providers to automobile OEMs. A qualified car front-mounted wireless charging requires basic wireless charging certification, meeting stringent car-level hardware standards, and certain levels of requirements for operating temperature range, waterproof and dustproof, etc. Therefore, not too many manufacturers install wireless charging.
2.Rear mounted wireless car charger
The rear-mounted wireless car charger means that the original car does not have a wireless charger device, and an additional device such as a car holder is added to the car to realize wireless charging. Generally, the rear-mounted wireless car charger can be installed in the positions such as air-conditioning vent, the center console of the car, or sucked on the windshield with the help of a suction cup.
Car rear-mounted wireless charging is not part of the entire vehicle and is not subject to the compulsory certification standards of many car manufacturers. Therefore, although the product reliability is not as good as that of the front-mounted, it wins in the industry with low entry barriers and high product cost-effectiveness.