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无线充电技术 无线充电技术( Wireless charging technology; Wireless charge technology )。 无线充电技术,源于无线电力输送技术。无线充电,又称作感应充电、非接触式感应充电,是利用近场感应,也就是电感耦合,由供电设备(充电器)将能量传送至用电的装置,该装置使用接收到的能量对电池充电,并同时供其本身运作之用。由于充电器与用电装置之间以电感耦合传送能量,两者之间不用电线连接,因此充电器及用电的装置都可以做到无导电接点外露 。 概述 麻省理工学院的研究团队在 2007 年 6 月 7 日美国科学杂志的网站上发表了他们的研究成果。研究小组把共振运用到电磁波的传输上而成功 “ 抓住 ” 了电磁波。他们利用铜制线圈作为电磁共振器,一团线圈附在传送电力方,另一团在接受电力方。当传送方送出某特定频率的电磁波后,经过电磁场扩散到接受方,电力就实现了无线传导。这项被他们称为 “ 无线电力 ” 的技术经过多次试验,已经能成功为一个两米外的 60 瓦灯泡供电。这项技术 的最远输电距离还只能达到 2.7 米,但研究者相信,电源已经可以在这范围内为电池充电。而且只需要安装一个电源,就可以为整个屋里的电器供电,现在这种技术已经被桑德力有限公司用在了桑德力无线移动电源上来了。 共振原理 。 麻省理工学院的科研组不是第一个提出无线能量转换的组织。科学家早在 19 世纪就发现了电磁转换现象,从理论上说,电力可转化为通过无形的介质传播的电磁波,实现电力 的无线输送。但是电磁波向四面八方辐射,能量大量散失,因此 “ 无线输电 ” 的研究始终进展不大, 19 世纪的物理学家和工程师尼古拉 特斯拉进行了远程无线能量转换系统实验,但是当他的财力用尽后,这项最有野心的尝试 (29 米高的瓦登克莱弗塔 )宣告失败。其他尝试包括激光等定向能量转换机制。然而,它们与麻省理工学院的工作不同,这些都需要连续的可视线路,这对住宅周围的电力设施不好。 研究组成员,助理教授马林 索亚克教授和他的科研组正在改进这个设备。 “ 这是一项还未得到发展的系统,它证明能量转换行得通。但是你不会愿意利用它给你的膝上 型电脑供电。我们的目标是缩小这个设备的体积、扩大感应器间的距离和提高电力转换功效。 ” 他与同事安德烈 库尔斯、阿里特迪兹 卡拉里斯、罗伯特 莫埃特、约翰 加侬珀洛斯和彼得 索利科合作,进行了这项研究。 这个系统利用了共振 (当一个物体与另一个物体的固有频率一样时,就会产生震动 )原理。当两个物体的振动频率相同时,它们传递能量的强度不会受到周围事物的影响。索亚克教授解释说: “ 如果房间内放了许多相同的杯子,你向瓶中倒入不同度数的葡萄酒,这时这些杯子就会产生不同的振幅。 ” 例如,如果用勺子敲击,每个杯子都会发出不同的声音 。 “ 如果我进入房间,开始用非常高的声音歌唱,当我的声音与其中一个杯子的频率相同时,它就有可能爆炸。 ” 据英国广播公司 2007 年 6 月 19 日报道,这个无线电力传输不像电力设备,它可以避免被鼠巢破坏,减少很多麻烦,因为它并不需要电线连接。研究人员在科学杂志上对这种设备作了详细介绍。在实验测试中,这个设备让距离它 2 米 (7 英尺 )的一盏 80 瓦电灯泡发出光亮。该装置被称作 WiTricity,研究人员根据物理学原理研发了它,这种设备还适合为膝上型电脑等装置提供电源。 WiTricity 利用的是低频电磁波共振,而不是利用声学共 振。在实验中,两个感应器都以 10 兆赫的频率震动,产生共振,让能量在两者之间传递。伦敦帝国学院的约翰 本德莱教授解释说: “ 随着每一次共振,感应器中会有更多的电压产生。 ” 经过产生多次共振,感应器表面就会集聚足够的能量,让灯泡发出光亮。这个能量的集聚也是为什么一位歌手用与杯子相同频率的声音歌唱时,杯子不会立刻破裂的原因。本德莱教授说:“ 酒杯不断集聚能量,直到能将自己打碎。 ” 据本德莱教授说,利用波长为 30 米 (100 英尺 )的低频电磁波具有安全优势。他说: “ 通常用千兆赫兹 (更短的波长 )的手机时,会有电场和磁场辐射同时 产生。 ” 这个过程就是我们所知的 “ 远声场 ” 的一个典型特征,这种场是从振幅超过一个波长的设备里产生的,如果振幅小于一个波长,产生的将主要是磁场。约翰说: “ 身体对电场的反应很强烈,这也是为什么你能利用微波炉烹制鸡肉的原因。但是磁场不会对人体产生影响。根据身体对能量的吸收,它对磁场的反应几乎为零。 ” 因此,这项设备不能给人类带来任何明显的健康风险。 主流技术 现在的无线充电 技术已经被桑德力公司给使用,现在主流的无线充电标准有三种: Qi标准、 Power Matters Alliance(PMA)标准、 Alliance for Wireless Power(A4WP)标准。桑德力牌无线移动电源就是通过了 QI 标准,下面我们就针对这三种标准进行简单介绍。 1、 Qi 标准 Qi 是全球首个推动无线充电技术的标准化组织 -无线充电联盟 (Wireless Power Consortium,简称 WPC)推出的 “ 无线充电 ” 标准,具备便捷性和通用性两大特征。首先,不同品牌的产品,只要有一个 Qi 的标 识,都可以用 Qi 无线充电器充电。其次,它攻克了无线充电 “ 通用性 ” 的技术瓶颈,在不久的将来,手机、相机、电脑等产品都可以用 Qi 无线充电器充电,为无线充电的大规模应用提供可能。 现在,市场比较主流的无线充电技术主要通过三种方式,即电磁感应、无线电波、以及共振作用,而 Qi 采用了目前最为主流的电磁感应技术。在技术应用方面,中国公司已经站在了无线充电行业的最前沿。据悉,现在 Qi 在中国的应用产品主要是手机,这是第一个阶段,以后将发展运用到不同类别或更高功率的数码产品中。截至现在,联盟成员数量已增加到 74 家,包括飞利浦、 桑德力、 HTC、诺基亚、三星、索尼爱立信、百思买等知名企业都已是联盟的成员。 2、 Power Matters Alliance 标准 Power Matters Alliance 标准是由 Duracell Powermat 公司发起的,而该公司则是由宝洁与无线充电技术公司 Powermat 合资经营,拥有比较出色的综合实力。除此以外,Powermat 还是 Alliance for Wireless Power(A4WP)标准的支持成员之一。 现在已经有 AT&T、 Google 和星巴克三家公司加盟了 PMA 联盟 (Power Matters Alliance缩写 )。 PMA 联盟致力于为符合 IEEE 协会标准的手机和电子设备,打造无线供电标准,在无线充电领域中具有领导地位。 现在 Duracell Powermat 公司推出过一款 WiCC 充电卡采用的就是 Power Matters Alliance 标准。 WiCC 比 SD 卡大一圈,内部嵌入了用于电磁感应式非接触充电的线圈和电极等组件,卡片的厚度较薄,插入现有智能手机电池旁边即可利用,利用该卡片可使很多便携终端轻松支持非接触充电。 3、 A4WP 标准 A4WP 是 Alliance for Wireless Power 标准的简称,由美国高通公司、韩国三星公司以及前面提到的 Powermat 公司共同创建的无线充电联盟创建。该联盟还包括 Ever Win Industries、 Gill Industries、 Peiker Acustic 和 SK Telecom 等成员,目标是为包括便携式电子产品和电动汽车等在内的电子产品无线充电设备设立技术标准和行业对话机制。 转换装置 工作原理 利用物理学的 “ 共振 ” 原理 两个振动频率相同的物体能高效传输能量。 1.输电线中的电能传入用铜制造的天线中。 2.天线以 10 兆赫的波长振动,产生电磁波。 3.天线发出的能量传播到 2 米 (6.5 英尺 )外。 4.同样以 10 兆赫的频率震动的膝上型电脑接收到电流,能量充入设备中。 5.没有转换成膝上型电脑的能量不会被天线重新吸收。不能产生 10 兆赫共振的人和其他物体不会对它产生干扰。 主要特点 1、从理论来说,无线充电技术对人体安全无害处,无线充电使用的共振原理是磁场共振,只在以同一频率共振的线圈之间传输, 而其他装置无法接受波段,另外,无线充电技术使用的磁场本身就是对人体无害的。但无线充电技术毕竟是新型的充电技术,以迈源科的无线充电器来说,很多人都会担忧无线充电技术会像当初 Wi-Fi 和手机天线杆刚出现一样,其实技术本身是无害的。 2、桑德力的无线充电技术利用电磁炉原理在充电器与手机之间利用磁能转化为电能,线圈和电容器则在充电时产生转化作用。 3、桑德力表示这一系统可以在未来得到广泛应用,例如针对电动汽车的充电区以及针对电脑芯片的电量传输。采用这项技术研制的充电系统所需要的充电时间只有当前的一百五十分之一。 4、转化率一直是很多人担心的问题,麻省理工学院通过研究表明,无线充电技术的损耗比起有线充电技术来说更高。迈源表示:无线充电高转化,也是无线充电器得以在全球进行应用的关键因素。但无线充电技术也受到距离的限制,未来发展,必然需要解决远距离传送对于波段和磁场范围的精准定位问题。 5、共振控制核心芯片是无线充电技术共振原理控制中心。精准辐射范围控制,磁场频率大小,其它控制等都是由芯片实现。 市场需求 1、随着 iPhone、 iPad 等对电量充满 “ 饥渴 ” 的设备迅速兴起,研发无线充电等突破性充电技术的需求日益提高。富士 通在一份声明中说: “ 这项技术将为手机集合紧凑型无线充电功能以及同时为多个便携式设备充电铺平道路。对多个设备充电时,设备相对于充电器的位置没有任何限制。 ” 2、现在有很多无线充电系统都是依靠线圈之间的电磁感应来实现的,这种方式工作距离短,设备需要放置在充电座上。 测试应用 1、测试结果显示无线传输距离大约在 15 厘米左右,但富士通表示无线传输距离最终可实现几米远。 2、需要指出的是,距离设备越远,传输中损耗的电量越多。 3、桑德力的系统与美国 Witricity 公司研发的技术类似,后者同样利用磁共振传输电量,传输 距离可达到几米远。 有关无线充电技术应用的社会实际效益 当今,世界各国都在争先恐后的研制无线充电技术。随着自然资源的不断匮乏和日益加重的环境保护问题,以电能来替代其它能源的运输工具已逐渐的发展开来,电动汽车以及电动自行车已普遍的深入到了人们的生活当中。作为电动汽车快速充电设备的技术难题还有很多,其中之一就是如何利用无线充电技术来实现电动汽车日益增长的需要。无线充电技术的不完善,问题的关键点就是能源损失太大和磁电感应转换的效率较低。另外,还有大功率无线充电技术的远距离传输和电磁对环境的辐射 影响等因素还没有得到充分的解决。 电动汽车实现无线充电技术的优点是替代了原始的电网直插式链接的诸多弊端,还有电能补充的时间长、车位占地面积大以及人工操作繁琐等不利因素。对于以往的这种充电技术来讲只是一次性电网的电能转换,而且一次性电磁感应的电能损失小,因为变压器初次级的电能频率与电网是一致的( 50 赫兹),所以不存在中频以上电磁辐射对环境产生的影响。但其缺点是在充电时必须提前安装好接电装置和需要加长电源引线以及存在某些不安全性等繁琐操作因素。随着电动力汽车技术的不断完善和市场的保有量逐步的增加,也是为了方 便电动汽车的能源补给,人们开始尝试着研究如何利用无线充电技术对电动汽车进行充电,以解决电动汽车在有线充电过程中的诸多不利环节。 优缺点 有线充电技术与无线充电技术各有各的优缺点。 有线充电技术的优点 : 1,能源转换一次性获得,电能损失小,节能环保。 2,交直流转换一次性,不存在中高频电磁辐射。 3,设备技术含量低,经济投入不大,维修方便。 4,电功率的调节范围较宽,适合多种不同电压和电流等级的蓄电瓶储能补给。 有线充电的缺点: 1,设备的移动搬运和电源的引线过长,主要是人工操作繁琐。 2,设备以及在对电动汽车充电时其公共占地面积过大, 3,在人工操作过程中,极易出现设备的过度磨损以及不安全性等因素。 无线充电技术的优点: 1,利用无线磁电感应充电的设备可做到隐形,设备磨损率低,应用范围广,公共充电区域面积相对的减小,但减小的占地面积份额不会太大。 2,技术含量高,操作方便,可实施相对来说的远距离无线电能的转换,但大功率无线充电的传输距离只限制在 5 米以内,不会太远。 3,操作方便。 无线充电技术的缺点: 1,虽然设备技术含量高,但设备的经济成本投入较高,维修费用大。 2,因实现远距离 大功率无线磁电转换,所以设备的耗能较高。无线传输的距离越远,无用功的耗损也就会越大。 3,无线充电技术设备本身实现的是二次能源转换,也就是将网电降压(或直接)变为直流电后在进行一次较高频率的开关控制交流变换输出。由于大功率的交直交电流转换是进行电能的二次性无线传输原因,所以电磁的空间磁损率太大。 4,因为采取无线传输,磁能的无用功耗损会随着无线充电设备的功率增高而上升。 如今,无线充电技术在小功率的范围内还是可以显示出它的优越性的。比如小型直流用电设备中的通讯仪器仪表、民用无线通讯手机、微型计算 机、小型便携式家用电器等。但实施大功率的无线传输来说,就比较困难了。根据磁能无线传输理论来说,传输的距离越远,磁能的消耗就会越大,而在终端设备中所获得的电能量也就越小。从电动汽车所需的能量补充电功率来说不是很小,一般小型的家用电子设备的充电电流在 0.5安培至 2安培之间。而一部几十马力的电动汽车所需的电能补充电流大多在 5 安培至 20 安培左右。电动汽车的功率越大,所需补充电能的电流量也就越大。而且我们在制造无线充电设备时,其输出功率会大于 500 瓦特以上或甚至更高。如果多部机车的联动充电,那么所需的总电源功率输出就会直线上升。对市电的供电系统来说无疑是雪上加霜,从而带给整座城市的是电网改造和巨额的经济投入,真是得不偿失。 另外,我们可计算一下经济账。按充电电压 24 伏特和 15 安培的电流对一部电动汽车进行充电,充电时间为 10 小时,其电能损耗只不过在 3 度左右,按市电当前的 0.5 角价格计算,给一部电动汽车充电的费用大约在一元五角钱左右。如果个人将电动车开到公共无线充电场合去充电的话,其费用不用说是很高的,我们这里所说的是自己使用一般的有线充电装置对电动车充电时所产生的费用。我们可对比一下,在同一台电动车充电的状态下,无线 充电设备的功率肯定大于一般有线充电装置。因为无线充电设备的电损肯定大于有线充电设备的损耗,鉴于两种设备之间的经济投入和充电费用,所以人们往往还是喜欢采取低经济投入的有线充电设备来使用。依据电工学理论,我们知道,变压器的磁路越长,磁损会越大。不论是采取那一种电磁 磁电的远距离传输转换,都会损失大量的电能。而且电磁 磁电的转换次数越多,电能的损耗也会越大。而且电子器件的工作电流越大,器件的老化期也会越提前,这给我们对设备的维修和使用带来了很多的不便利因素。 关于电动车充电站的设立,在我看来不碍采取两种方 式进行对比。就其一次性的充电费用来说,客户们还是喜欢选择一般有线充电的充电方式。我说的前提是两种充电设备具有一样的技术指标,都可实施快速充电方式和同样的充电质量。此时,我们可通过对充电设备的电能耗损参数做个对比,看看哪种设备的经济价值和社会效益更高。因为我们这个社会是以市场经济核算下的区域部门单位,人人都要计算经济的投入与回报,所以每一项高科技产业的投入也必须考虑大众化的普遍认可和产业自身的经济杠杆问题。同时在化石能源还没有达到枯竭的现代社会,民用电动汽车的发展也不会太快,如果能够提高蓄电池的一次性充电使用 周期才是解决问题的最好办法。较短的电池一次性充电使用周期是制约电动汽车发展的最大阻力,从汽车的功率和速度来看,燃料汽车还是存在较多的优越性。 根据现代能源匮乏的实际情况,电动运输工具实现大功率无线充电技术的产业运作还为时过早。为什么会这样的说呢?虽然发展电动汽车可以节约能源和有利于环境的保护,但对供电系统的各方面量化要求也会更大;如增加电站的建设投资、输电网络的改造增容等原因。还有,因为电动汽车的社会保有量越大,所需的长期停车充电场所的占地面积也要随之扩大。实际上,采取大功率无线充电技术的社会经济投 入费用普遍较高,而利用常规有线式充电方式既简便,一次性投资又小,而且对市电的量化需求又不大。还有就所占用的土地面积来说也相对的减少,这里所说的减少,是因为每个家庭都可以实施对电动汽车的能量补充,不会统一的集中到公共场所去充电。另外,每个家庭也不会购买价格较高的无线充电设备的,而且自己所担负的充电费用较公共场所要低得多。所以我们一定要宗合来考虑实施大功率无线充电技术的步子迈得是否不要太大,这仅仅是为了一时的方便,而导致了社会总体资源的大量消耗是否是得不偿失呢? Wireless charging technology Wireless charging technology (Wireless charging technology; Wireless charge technology).Wireless charging technology, is the result of wireless power transmission technology.Wireless charging, also known as induction charging, non-contact inductive charging, induction is the use of the near field, which is the inductance coupling, by the power supply equipment (charger) to transfer energy to the utilization device, the device using the received energy of the battery, and at the same time for its own operation.Because between the charger and power device with inductively coupled transmission energy, not between wires, so the charger and electric device can do without conductive contact the leakage. An overview of the A team of researchers at the Massachusetts institute of technology in June 7, 2007, the United States in the journal science published their research results on the website.The team on the application of resonance to the electromagnetic wave transmission and successful grab the electromagnetic waves.They use copper coil as a magnetic resonance device, a coil attached to transmit power, another group in power.When sending party sent out a certain frequency electromagnetic waves, through the electromagnetic field spread to the receiving party, realize the wireless transmission power.This what they called a wireless power technology after many experiments, has successfully for a 60 watt light bulb power of two metres away.The transmission range of this technology also can reach 2.7 meters, but the researchers believe that the power can be in the range of the battery.And only need to install a power, it can be for the whole house appliances, this technology has been sander co., LTD in the Thornton forces the wireless mobile power supply. The principle of resonance. Colleagues at the Massachusetts institute of technology is not the first to put forward the organization of the wireless energy conversion.As early as the 19th century scientists found that the phenomenon of electromagnetic transformation, in theory, can be converted into electricity by invisible medium transmission of electromagnetic wave, realize the wireless transmission of power.Electromagnetic radiation in all directions, however, a lot of energy is lost, so that the study of wireless transmission is less progress, physicists and engineers in the 19th century nikola tesla remote wireless energy conversion system experiment was carried out, but when his money run out, the most ambitious attempt (29 meters high walden clover) failed.Try to include other laser directed energy conversion mechanism, etc.However, they are working with at the Massachusetts institute of technology, there needs to be visible lines in a row, its bad for residential power facilities around. Team member, ma Lin, assistant professor, professor Jacob and his colleagues are to improve the equipment.This is a system that has not been developing, it proved that energy conversion work. But you dont want to use it to your laptop power supply. Our goal is to shrink the volume of this equipment, enlarge the distance between sensor and improve the power conversion efficiency.He and his colleagues Andre coors, ali teddy, Carla rees, Robert mo etta, John nong perlow and Peter solis, cooperation, carried out the research. This system takes advantage of the resonance (when an object with another object of the inherent frequency is same, can produce vibration) principle.When two objects of vibration frequency at the same time, they transfer energy intensity will not affected by the surroundings.Mr. Professor Jacob explained: if the room to put many of the same cup, you to pour into different degrees of wine in bottle, then can produce different amplitude for the cups.For example, if hit with a spoon, every cup of different sounds.If I entered the room and began to sing with the voice of a very high, and when my voice and one of the frequency of the cup at the same time, it could explode. According to the British broadcasting corporation reported on June 19, 2007, unlike the wireless power transmission power equipment, it can avoid destroyed by rats nest, reduce a lot of trouble, because it does not need to wire connection.Researchers in the journal science on this kind of equipment has made the detailed introduction.In laboratory tests, the equipment for a distance of 2 meters (7 feet) a 80 - watt light bulb light.The device is called WiTricity, researchers have developed it according to the principle of physics, this equipment is suitable for devices such as laptop power supply.WiTricity USES the low frequency electromagnetic wave resonance, rather than using acoustic resonance.In the experiments, two sensors are at a 10 MHZ frequency vibration, produce resonance, make the energy transfer between the two.Imperial college London professor John bender lai explained: as each resonance, produced in the sensors will have more voltage.Through generates multiple resonance, sensor surface can offer enough energy, let the light bulb.The energy concentration is why a singer to sing with the voice of the same frequency and cup, the cup is not immediately broken reasons.Professor bender lai said: gather energy glass until can take break. According to professor bender lai said, using the wavelength is 30 meters (100 feet) of low frequency electromagnetic wave has the security advantages.He said: usually use thousand MHZ (shorter wavelength) of the phone, there will be radiation electric field and magnetic field is produced at the same time.This process is known as far sound field characteristics of a typical from the amplitude of this field more than a wavelength in the equipment, if the amplitude is less than a wavelength, the mainly is the magnetic field.John said: the bodys response to the electric field is very strong, this is also why you can use microwave oven to cook chicken. But magnetic field will not affect the human body. According to your body to absorb energy, its response to the magnetic field is almost zero.Therefore, the device cant bring any apparent to the human health risk Mainstream technology Now Wireless charging technology have been used by Thornton force companies to, now there are three kinds of mainstream Wireless charging standard: standard of Qi, Power Matters Alliance (PMA) standard, the Alliance for Wireless Power (A4WP) standard.Thornton force wireless mobile power is through the QI standard, lets standard for these three simple introduced. 1, the Qi standard Qi is the worlds first promote organization for standardization of Wireless charging technology, the Wireless charging alliance (Wireless Power Consortium, referred to as the WPC) launched the charging standard, with two big features convenience and versatility.First, different brand products, as long as there is a Qi logo, can use Qi wireless charger.Second, it overcome the technical bottleneck of wireless charging generality, in the near future, mobile phones, cameras, computers and other products can use Qi wireless charger, for large-scale application of wireless charging. Now, the market is the mainstream of wireless charging technology mainly through three ways, namely, electromagnetic induction, radio waves, and the function of the resonance, and Qi adopted at present the most mainstream electromagnetic induction technology.In terms of technology, Chinese companies have stood in the wireless charging the forefront of the industry.It is reported, now Qi products mainly used in Chinas mobile phone, this is the first stage, the development will be applied to different category or a higher power of digital products.As of now, union membership has increased to 74, including philips, sander, HTC, nokia, samsung, SONY Ericsson, best buy and other famous enterprises have been is a member of the alliance. 2, Power Matters Alliance standards Power Matters Alliance standard is made up of Duracell Powermat launched, and the company is by p&g and the Powermat wireless charging technology company joint venture, with better comprehensive strength.In addition, the Powermat or Alliance for Wireless Power (A4WP) standards support member. Now has three companies AT&T, Google and starbucks joined the Alliance of PMA (Power Matters Alliance).PMA alliance commitment to conform to the standard of the IEEE association mobile phones and electronic devices, make wireless power supply standard, leading in the field of wireless charging. Now Duracell Powermat launched a WiCC rechargeable card used in the Power of Matters Alliance standards.WiCC was larger than the SD card, inside the coil for electromagnetic induction type contactless charging and electrode components, such as the thickness of the card is thinner, insert the existing smart phone batteries can be used by it, use the CARDS can make a lot of portable terminal support non-contact charging easily. 3, A4WP standard Short for A4WP is Alliance for Wireless Power standard, by qualcomm, samsung, and mentioned the Powermat Wireless charging Alliance to create together to create.The alliance also includes (Win Industries, Gill Industries, Peiker Acustic members and SK Telecom, goal is to include portable electronic products and electronic products, including electric cars and other wireless charging equipment to set up the technical standards and industry dialogue. Conversion device The working principle of By using the theory of resonance of physics - two vibration frequency of the same object can efficiently deliver energy. 1. The power in a transmission line to made of copper in the antenna. 2. The antenna to the wavelength of 10 MHZ vibration, electromagnetic wave is produced. 3. The energy transmitted from the antenna to the outside of the 2 meters (6.5 feet). 4. Same with 10 MHZ frequency of vibration of the laptop computer receives the current energy filling the equipment. 5. Not convert the energy of the laptop wont be antenna to absorption.Does not produce 10 MHZ resonance and other objects will not interfere with it. The main features 1, from the theory, wireless charging technology harmless to the human body, the use of wireless charging is magnetic resonance resonance principle, only in the same frequency resonance transmission between coil, and other devices cannot accept band, in addition, wireless charging technology USES magnetic field itself is harmless to the human body.But, after all, wireless charging technology is a new type of charging technology, to take the source of the wireless charger, many people have concerns about wireless charging technology will as wi-fi and mobile phone mast just appear, in fact, the technology itself is harmless. 2, sander force of wireless charging technology use induction cooker principle between the charger and mobile phone use magnetic energy into electricity, while the coil and capacitor charging into effect. 3, Thornton said the system can be widely used in the future, such as the recharge area for electric cars and computer chip for power transmission.Using the technology of the charging system need charging time is only about one over one hundred and fifty of the current. 4, the conversion has been a lot of people worry about a problem, the Massachusetts institute of technology through the study, the wastage of the wireless charging technology is higher than the cable charging technology.Michael source said: wireless charging high conversion and wireless charger to application of the key factors in the world.But as wireless charging technology is limited by distance, the future development, must need to solve the long-distance transmission for accurate positioning problem of wave and magnetic field range. 5, resonance control core chip is wireless charging technology resonance principle control center.Precise radiation range control, the size of the magnetic field frequency, other control is implemented by the chip. The market demand 1, as the iPhone, such as the hunger for power equipment grew rapidly, research and development of breakthrough charging technology such as wireless charging demand is increasing day by day.Fujitsu said in a statement: the technology for mobile phone set compact wireless charging functions and pave the way for many portable devices. At the same time for multiple devices, equipment relative to the location of the charger without any limitation. 2, there are many wireless charging system relied on the coil electromagnetic induction, between this way working distance is short, equipment need to be placed on the charging seat. The test application 1, the test results show that the wireless transmission distance is around 15 cm, Fujitsu, said wireless transmission distance can finally realize a few meters away. 2, it should be pointed out that, the farther the distance devices, the more electricity transmission loss. 3, sander force system of Witricity technology to develop similar with the United States, which is also used magnetic resonance transmission power, transmission distance can be up to a few metres away. On the application of the wireless charging technology social practical benefits Today, all countries in the world in the development of the wireless charging technology.With the lack of natural resources and growing environmental problem, electric energy to the development of transport has gradually replace other energy, electric cars and electric bikes have widely deep into the peoples life.As electric car fast charging equipment technical difficulties and there are many, one of which is how to use the wireless charging technology to realize the increasing needs of the electric car.The imperfect of wireless charging technology, the key problem is energy loss is too big and magnetoelectric induction conversion efficiency is low.In addition, there is power of the wireless charging technology and electromagnetic radiation effects on the environment factors, such as has not been fully resolved.Electric car to realize the wireless charging technology has the advantage of replacing the original straight insert links to drawbacks of power grid, and power added a long time, the parking space covers an area of big and unfavorable factors, such as manual operation trival.For past the charging technology is just a one-off grid electric energy conversion, and disposable electromagnetic induction electric energy loss is small, because the first level of power frequency transformer is consistent with power grid (50 hz), so there is no more than intermediate frequency electromagnetic radiation effects on the environment.But its drawback is in charge must be installed ahead of the electric device and need to be extended power leads and existing some unsafe factors such as complicated operation.With the constant improvement of electric vehicle technology and the market has gradually increased, and for the convenience of the energy supply, electric cars, people began to try to study how to make use of the wireless charging technology to recharge electric cars, electric cars, in order to solve the negative link in the process of charging cable The advantages and disadvantages The cable charging technology and the wireless charging technology, the advantages and disadvantages of each have each. The cable charging technology advantages: 1, energy conversion, a one-time, small power loss, energy conservation and environmental protection. 2, ac/dc conversion of disposable, does not exist in the high frequency electromagnetic radiation. 3, equipment, technology content is low, economic investment, convenient maintenance. 4, power of the adjusting range is wide, suitable for a variety of different voltage and current levels of battery energy storage supplies. The cable charging shortcomings: 1, equipment to transport and power supply wire is too long, mainly manual operation and trival. 2, equipment, and in the electric vehicle charging its public area is too big, 3, in the process of manual operation, appear easily excessive wear and unsafe factors of the equipment. The advantage of the wireless charging technology: 1, the use of wireless magnetoelectric induction charging device can be invisible, equipment wear rate is low, the application range is wide, public charging area area is relatively reduced, but reduce the share of the area is not too big. 2, high technical content, easy to operate, can be implemented relatively remote radio can transform, but high power wireless charging to limit the transmission distance of 5 meters, not be too far away. 3, easy to operate. Today, the wireless charging technology in small power range can still shows its superiority.Such as small dc electric equipment in the communication instruments and meters, civilian wireless mobile phone, microcomputer, small, portable appliances, etc.But the implementation of high power wireless transmission, it is more difficult.According to the theory of magnetic energy wireless transmission, transport the farther the distance, the greater the magnetic energy consumption will be, and in the terminal equipment of electrical energy has the less.From the electrical energy is not needed for the electric car is very small, generally small household electronic device between 0.5 to 2 amps charging current.And a few horsepower required for electric cars to replace current mostly around 5 amperes to 20 amp.The greater the power of the electric car, the required supply electric power flow.And we are making the wireless charging equipment, its output will be greater than 500 w above or even higher.If some of the linkage of locomotive charging, then the total power output will increase.Is definitely icing on the cake for mains power supply system, so as to bring the whole city is a network reconstruction and huge economic investment, its not worth the cost. About the establishment of electric

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