Should my country vigorously develop and invest in wireless charging technology for electric vehicles?

alan000345

Should my country vigorously develop and invest in wireless charging technology for electric vehicles? [Copy link]

When I was engaged in the project development of the wireless charging system for electric vehicles, I participated in the formulation of three national standards. In the discussion group of the three national standards, I found that many companies did not pay attention to the electromagnetic radiation problem in the process of wireless charging of electric vehicles. When the two coils are connected with a constantly changing high-frequency alternating current, the two coils will inevitably excite a magnetic field around them, and these magnetic fields will emit electromagnetic radiation to the outside world. In the discussion group of the three national standards, I learned that many domestic wireless charging equipment manufacturers for electric vehicles do not pay attention to the magnetic radiation problem in the process of wireless charging of electric vehicles. Many R&D personnel carry out development without wearing any anti-electromagnetic radiation clothing. For this fact, the leaders of many enterprises and institutions gave the answer that there is no radiation. Our engineers have been developing for three years and have not worn anything and have not gotten sick. Forget about the R&D personnel not taking protection, and the design of any anti-electromagnetic radiation of the product is rarely put on the agenda. At that time, I found that the highest frequency of products made abroad was only 40kHz, and the radiation protection materials abroad were mainly concentrated on the aluminum shell protection. At the same time, the paper also mentioned which parts of the electric vehicle should be shielded and isolated. But it seems that China does not pay much attention to this. When I saw a foreign netizen commenting on wireless charging of electric vehicles, he actually said that he hoped China would vigorously develop it, which would be the cancer of the automotive industry. Some friends in China even compared the development of genetically modified organisms to the importance of developing wireless charging for electric vehicles.

At present, the national standard is mainly based on SAE J2954 TIR, in which the frequency of wireless power transmission (WPT) for electric vehicles (EV) is set at around 85kHz. Not to mention the radiation problem, the International Amateur Radio Union (IARU) recently published an article entitled "UNWANTED EMISSIONS IN THE SPURIOUS DOMAIN FROM WIRELESS POWER TRANSFERFOR ELECTRIC VEHICLES ON FREQUENCIES ALLOCATED TO THE AMATEUR SERVICE", pointing out that Discussions are underway in CEPT, CISPR and ITU over the introduction of Wireless Power Transmission for Electric Vehicles on a wide spread basis across Europe. Domestic charging systems are expected to use afrequency around 85kHz. This poses They are worried that the harmonics generated by these high-power installations will pose a real risk to radio communications in the urban/suburban/rural environment.

I think we still need to develop wireless charging technology for electric vehicles. After all, various countries are vigorously developing it, and we cannot fall behind. However, we still need to pay enough attention to the radiation problem, as well as the interference with other wireless communications. However, I dare not give the best prediction as to whether charging piles are better or wireless charging devices are the best in the future. I wonder what my colleagues think of wireless charging technology for electric vehicles. Will static and dynamic wireless charging devices for electric vehicles replace traditional charging piles?

le062

I chose this Personal opinion: The future mode of transportation is driverless + shared cars. For short-distance travel, directly rent a driverless shared car; for medium and long-distance travel, high-speed rail/airplane + driverless shared cars.

alan000345

le062 posted on 2018-6-27 16:14 I choose this personal opinion: the future transportation mode is driverless + shared cars. For short-distance travel, directly rent an unmanned shared car; for medium and long distance travel...

The charging robot released by Tesla is not simple.

alan000345

le062 posted on 2018-6-27 16:14 I choose this personal point of view: the future transportation mode is driverless + shared cars. For short-distance travel, directly rent a driverless shared car; for medium and long distance travel...

To achieve this, there are many technologies involved. First, visual positioning must be used. At least two cameras use binocular image positioning technology. Just like PCB boarding, there must be a reference point. The mechanical structure design is even more complicated. It is not easy to do. We saw this news last year and wanted to do it, but gave up.

whuer

Wireless charging of cars is impossible to achieve. The efficiency is too low. It takes a month to fully charge.

alan000345

whuer published on 2018-6-28 01:17 Wireless charging for cars is impossible to achieve. The efficiency is too low and it has not been fully charged for a month

Yes, because the current electric vehicle wireless charging equipment, the power side coil and the vehicle side coil can be theoretically regarded as a large loosely coupled transformer. From the formula, we can know that the power p transmitted between the two coils is constant. In order to achieve constant current and constant voltage charging, the compensation topology circuit is basically introduced. The introduced circuit is actually realized by capacitors and inductors. The compensation constant current charging and constant voltage charging circuit design are also different. The so-called constant current and constant voltage charging is still limited to the theoretical stage. According to my current understanding of electric vehicle wireless charging manufacturers, they basically still use constant power charging, which is what they often call shallow charging and shallow discharge. Moreover, the output power of current wireless chargers is very small, and it is basically equivalent to constant voltage charging. In order to protect the battery, there is no constant current process. The voltage of this constant voltage charging must be smaller than the value of constant voltage charging of a normal charging pile. Therefore, it will never be fully charged.

xujian2000

There must be relevant provisions to protect people and the electromagnetic pollution of the environment, so that we don't have a haze-free sky like today, where there are only a few days a year.