The seven-day National Day holiday was over. Then we waited for a seven-day working day. There was an old saying that was good, and the mixed TAT would come sooner. Since the holiday season is over, we will first close and take a look at this Formula E in Hong Kong. On October 9th, the World Series of Electric Formula Championships kicked off the new season with much expectation. With the F1 2016 season coming to an end, FE can be another spiritual sustenance for you as a racing fan. As long as it is a stadium, there will always be a strange force that makes people excited and passionate. As a result, I almost wrote a topic and got back to business. This time in Formula E opening game, we not only witnessed a spectacular motor sport, but also learned about it. Qualcomm Halo wireless charging technology.
In the area of â€‹â€‹small household appliances such as mobile phones and electric toothbrushes, this technology has become more mature and widely recognized by consumers. In the field of electric vehicles, wireless charging technology is also quietly emerging. When you park your car in the parking space, your car will start to charge without any more tedious operation through the wireless charging device; or in the future, your electric car will continue to charge the car while driving. Another point of view to solve the short-range injury of electric vehicles, which sounds pretty good? Of course, many people in the heart must have no doubt about it and concerns, then from this article to take you to understand the following on the automotive field of wireless charging technology!
It is worth mentioning that these work vehicles are all equipped with Qualcomm Halo Wireless Charging (WEVC) technology, which transfers energy between the ground charging board and the vehicle charging board.
The purpose of the safety car is to take the car on the field until the impact of the racing game when accidents occur on the court. All safety and medical vehicle guidance vehicles need to have the fastest response speed to enter the runway. Their working status can deal with emergencies in the stadium in a timely manner, and the safety car must ensure that there is enough power at all times, and it is best to go out and recharge at any time to avoid battery power when the safety car is required to take a few laps on the field. Insufficient, it is very embarrassing.
It is necessary to have the quickest response, but also to follow the charge to ensure that there is enough power, wireless charging seems to be a good choice.
Wireless charging is still not popular in the field of electric vehicles. For the more unfamiliar technologies, apart from having great expectations, we must also hold a lot of curiosity. Why can wireless also charge? Today we talk about how wireless charging technology is implemented in the end!
â— electromagnetic induction wireless charging technology
Magnetic resonance inductive wireless charging technology stems from the principle of electromagnetic induction. Say here we first talk about the principle of electromagnetic induction. In one word, one day in 1819, a scientist in Denmark, Ernest, observed a magical phenomenon. If a piece of wire had a current, then a magnetic field would be generated around the wire, which could deflect the compass. If the wire is wound into a coil, the magnetic field is stronger and more concentrated.
On this basis, Faraday discovered electromagnetic induction. If a magnet is brought close to a coil without current, an induced current will be generated on the coil, which is also called electromagnetic induction. However, the induced current can only be generated when the external magnetic field is changed. That is, the magnet needs to be constantly up and down. When reciprocating, the induced current will not be generated if the applied magnetic field remains in motion.
So using these phenomena, we can achieve wireless charging, which is what we call electromagnetic induction wireless charging technology.
Since the home-charging generates AC power, the direction of the current can be continuously changed, so that the applied magnetic field is also changing.
The electromagnetic induction wireless charging working flow is as shown above, the transmitting end transmits the power, and the receiving end controls the load and provides a signal to the sending end, so as to avoid ensuring the normal transmission.
However, the wireless charging of this type of electromagnetic induction technology is slightly disadvantageous, that is, it is very strict with the coupling of the coil, and when the wireless charging device is far away from the charging stand, the transmission efficiency and power will be drastically reduced, and most of the wireless charging The device can only be charged when it is attached to the charging base, so this technology can only be used very close when wireless charging.
â— Magnetic resonance wireless charging
In order to achieve a longer distance for wireless charging and a desire to use it more conveniently, magnetic resonance wireless charging technology appeared later.
As mentioned above, magnetic resonance inductive wireless charging technology stems from the principle of electromagnetic induction. Magnetic resonance wireless charging is a breakthrough technology proposed by the research team led by Prof. Soljacic of MIT in 2007. This wireless charging technology requires a source resonator, which can generate a magnetic field. When the source resonator and the receiver resonator reach a certain frequency, both sides form a magnetic resonance phenomenon and achieve the purpose of energy transmission.
Like a tuning tool tuning fork, the tuning fork will continue to vibrate for a period of time when it is struck and sounds. Similarly, when the resonant circuit is energized for a short period of time, it will also produce a signal that maintains a period of time.
As mentioned above, the resonance characteristics of the tuning fork cause the tuning fork to vibrate at the same time near it as it will vibrate at the same time, even if the other tuning fork is not struck. The vibration of the tuning fork illustrates the realization of energy transfer.
Compared with electromagnetic induction wireless charging, electromagnetic resonance wireless charging can significantly improve the effective coupling of energy and transmission efficiency. Magnetic resonance wireless charging technology has some advantages over electromagnetic induction wireless charging: If the sensitivity between the base and the on-board energy receiver is small, the strictness of frequency requirements in the resonant mode can be specified by setting the frequency reasonably. Electrical power supplies improve safety.
Wireless charging technology at 2Formula E
â— Wireless charging on the electric equation championship
In the crowded formula E room, we saw where the safety car was parked and experienced some wireless charging. Of course, I didn't drive. I looked at the back seat. It was a simple process. Look at the tips on the phone. However, there are more people in the p room and I will take this picture. The general situation is: everyone, everyone, everyone, car, person, person, person, person, everyone, the real picture is nothing to enjoy, just look at it (people I don't have much time to go in. After all, FIA's event management is still very strict, with a prescribed opening time. Editor-in-Chief: Don't make excuses for your scum chart...).
What is worth mentioning is the energy transmission base. According to the vice president of technology of Qualcomm Europe Inc., this base only looks bigger. In fact, the coil only occupies part of the entire board (about the yellow line in the figure).
Of course, these messages will be notified to the owner through the app. In fact, the owner can see the charging status of the car at any time on the mobile phone. For example, when we want to park the car on the ground charging board, it is also through the app to judge whether there is a successful parking to the charging area.
So the wit's writer found the opportunity to slip into the car and experience it for a while... how others operate this wireless charging. As shown in the figure below, the driver first plunges the car to where the wireless charging dock can be seen in the reverse image, and then clicks on start alignment on the phone screen to start looking for the link wireless charging dock, and a circle will appear on the app. The closer to the charging area, the more full the circle is loaded, until it stops at the charging position, and the circle shows that a match means that the match was successful, and then the car enters the charging state.
Since last year, Qualcomm has upgraded its Halo charging power to 7.4 kW, meaning that races can be equipped with larger batteries for safety cars. At the same time, Qualcomm will also adjust the charging power according to different application scenarios and requirements. Moreover, the deployment of such wireless charging technology can reduce the capital and site investment of a single charging station to some extent, which means that more wireless charging points can be built.
In this activity, we also learned that Lear Corporation and Qualcomm announced that they have signed a wireless charging license agreement for electric vehicles. Lear will incorporate Qualcomm Halo wireless charging technology in its product portfolio to support plug-in hybrid electric vehicle (PHEV) and pure electric vehicle (EV) manufacturers and wireless charging infrastructure companies to commercialize WEVC systems. This also means that Qualcomm Halo wireless charging technology is rapidly moving toward civilian-grade electric vehicles.
There are objections to the support of wireless charging, there are some that feel useful, but also feel redundant. Before the arrival of Wi-Fi, who knows that the Internet can be so convenient, nearly 30 years in the development of electric vehicle wireless charging, we have See it progress faster. Today, with this technology advancing by leaps and bounds, I believe that this era of wireless charging for electric vehicles may be coming soon, and I look forward to more breakthrough development in every lifestyle-improving technology.
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