Wireless charging can solve unmanned aerial vehicle (uav) range of pain is it?
Recently, the imperial college Samer Aldhaher Dr Invented for uav wireless charging technology, unmanned aerial vehicle (uav) without any battery, can also be permanent.
In Samer Aldhaher demonstration, a no battery light drones in circle low, placed by the underlying wireless energy delivery device. Sending device consists of PCB (printed circuit board) coil, twisted copper strip on the fuselage, and equipped with a class D rectifier rectifier (class D) and DC/DC converter (DC/DC converter). In order to get better effect of wireless transmission of a complete set of equipment as well as a 13.56 MHz inverter.
This way not only ensure the uav fuselage lightweight, and theoretically can implement permanent operation of unmanned aerial vehicle (uav). But in the demonstration, the height of the unmanned aerial vehicle (uav) distance wireless transmitting energy only 5 inches (12.7 centimeters), and lateral movement range is also very limited.
Although the result of the experiment, Samer Aldhaher attempt for unmanned aerial vehicle (uav) field is still a good news.
Nearly two years, wireless charging technology rapid development, has now become one of the hottest technology. Mobile phone, tablet, the electric car industry even disruptive change is likely to happen. Samer Aldhaher attempt can be said to be the preliminary exploration of the uav wireless charging. So, as the struggle life product, unmanned aerial vehicle (uav) can benefit from the wireless charging technology?
Wireless charging good prospect in the field of mobile phones and cars
Wireless charging technology to develop the best application field is a mobile phone. Samsung, nokia, SONY and other manufacturers are introduced to support wireless charging function series products.
The Galaxy, for example, S6, Galaxy S6 Edge, the Galaxy S6 Active samsung flagship models support Qi and PMA standards, can adapt to a variety of wireless charging socket on market. The realization of the function of this innovation, let consumer dissatisfaction with samsung mobile phone battery life felt a little comfort.
According to the professional interpretation, wireless charging technology is the use of electromagnetic induction principle of alternating electromagnetic field, realize the wireless transmission of energy. There are two kinds of wireless charging way more common technology: electromagnetic induction type and magnetic resonance type, respectively.
according to the understanding of electromagnetic induction type refers to the primary winding of a certain frequency alternating current (ac), through the electromagnetic induction generate a certain amount of current in the secondary coil, thus transferring energy from the transmission to the receiver; Magnetic resonance type is composed of energy sending device and receiving device, when two device to adjust to the same frequency, or on a specific frequency resonance, they can exchange energy with each other.
At present, some induction solution has entered the stage of mass production, magnetic resonance (NMR) technology is also go into mass production at the end of 2014. In comparison, induction to tight coupling, in the position of the X/Y direction deviation to achieve the most hours can achieve the highest efficiency levels; And magnetic resonance (NMR) to allow greater spatial degrees of freedom, but it cannot be achieved based on the technology of magnetic induction peak efficiency.
Mobile phone charging way of Qi is the electromagnetic induction type, different brand products, as long as there is Qi logo, can use wireless charger (Qi, such as just mentioned samsung series machines and lumia920 support Qi protocol. Byd company in December 2005 patent application for contactless inductive charger, also use electromagnetic induction technology.
Magnetic resonance charging time of concern can be traced back to 2008, when in a laboratory at the Massachusetts institute of technology, the researchers lit from a distance a 60 w bulb, the system efficiency is about 15%. Magnetic resonance type theory transmission distance can be very big, but the long distance wireless charging in the news report only a few meters, and the actual effect remains to be proven.
In early 2015, the media reported that the us wireless power company WiTricity to implement wireless power supply in the form of magnetic resonance, the farthest distance is 2.4 meters, can charge over a long distance for multiple devices at the same time.
Whether still need to contact wireless charging, or long distance wireless charging, its developing prospects are to be reckoned with. According to IHS Technology analysts forecast in the wireless charging 2014 report, sales of wireless charging transmitters and receivers shipments will be increased from $2013 in 216 million to $2018 in 8.5 billion, up nearly 40 times.
Wireless charging in unmanned aircraft industry?
Have summed up the advantages of quick charge wireless media:
1, high space utilization. Wireless charging device installed close to the ground, and even can be buried, construction area in the same circumstances, implantable charging equipment number and increase the charging station space utilization;
2, strong adaptability and high reliability. Wireless charging can take seal installation contact with no use, can be used in rain and snow weather and increase the reliability;
3, high safety. Wireless charging equipment exposed conductive point, and when using unmanned aerial vehicle (uav) contact with people without charging equipment, can eliminate safety problems caused by the leakage in theory, safeguard the personal safety;
4, support unmanned management. Simplifies the charging process, cooperate with the network in unmanned management, no need professional personnel, in convenient for the user at the same time reduce the operation cost of charging station
Admittedly, wireless charging brought many convenient for the user, but for the following reasons, the author thinks that, wireless charging is difficult to inner field of unmanned aerial vehicle (uav) in a short time to popularize and apply:
1, loss is big. Especially charge over a long distance, high power wireless magnetoelectricity conversion, high energy consumption of the equipment. With the increase of the distance of wireless charging equipment and power, the busywork loss will have more.
Some netizens once remarked: "resonance would need coil, the coil is conductor, a resonance of leisure is not as good as her straight wire coil directly charging. Propaganda should be wireless charging product concept in order to get something out make money."
2, the cost is high. In the auto industry, for example, American Evatran company developed Plugless wireless charging system costs about 5 to 6 times of cable charging. Combined with wireless charging set laid, the cost is likely to further enhance.
3, the lack of industry standards. Wireless charging in the field of mobile phone and other portable electronic products development, such as Qi standard, Power Matters Alliance standards such as the floor. But in other areas, the wireless charging standard is not yet mature, the technology was applied to uav is far beyond reach, unmanned aerial vehicle (uav) itself, after all, there are many standard not unified.
4, people to radiation fears. Earlier rumours "wireless charger radiation is greater than the mobile phone", despite the rumours later there are professionals, but still cannot eliminate the masses for the concerns of the radiation. Cell phone still such, other large charging station is more difficult to accept, I'm afraid.
In addition, for unmanned aerial vehicle (uav), involving the practical problems. As a result of the bus route is relatively fixed, and electric cars driving on the highway or more within the urban commuter, can calculate the charging frequency relatively high site, establishing charging stations or charge here pile can fully improve the charging efficiency. But it's hard to say the use of unmanned aerial vehicle (uav) location is fixed, really need to use wireless charging technology, should be a high frequency, location relatively fixed industrial-grade unmanned aerial vehicle (uav).
Finally want to say is, cannot only depend on charging technology to solve the problem of life, manufacturers are also more than the battery capacity, power saving technology in the effort, several factors complement each other is the industry really need.