村田容性耦合无线充电模块模块可以10W功率对智能手机或平板电脑进行无线充电，Hitachi MaxWell已经基于该无线充电模块为苹果iPad2开发了无线充电平台。该模块现已进入大批量生产阶段。

图1： iPad2 wireless charger, AIR VOLTAGE for iPad2

村田无线充电模块适用于广泛的终端产品，包括：功能手机、智能手机、便携式音乐播放器、数码相机、平板电脑、笔记本电脑、玩具、照明系统和家居设备。

图2：Smartphone


图3：Digital reading device

未来，村田容性无线充电模块可以为家庭、办公室或公共场所提供方便的充电服务。

图4: 方便的充电服务

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村田无线充电模块的三大特色

该模块使无线充电系统成为现实。无线充电系统允许对放在一块充电板上的待充电设备进行充电，无需任何电缆连接。村田无线充电模块的特色包括：

第一大特色：充电区域宽

The following diagram shows power transmission efficiency with regard to position displacement between coupled elements (electrodes in capacitive coupling and coils in electromagnetic induction).

When position displacement between coupled elements (dz/D) is 1, the overlapping area between electrodes (in capacitive coupling) or coils (in electromagnetic induction) on the power transmitting and receiving sides is almost totally eliminated and displacement becomes significant (an electrode is displaced by as much as its own width).

In capacitive coupling, the decrease in power transmission efficiency is only 20% or so. If the position displacement is smaller, the decrease in power transmission efficiency remains at around 10%.

For this reason, capacitive coupling provides horizontal position freedom with an easy-to-use charging system for end customers. This means, for example, that a mobile phone does not have to be placed in an exact position on a charging pad to charge.

图5：Comparison of position displacement efficiency in electromagnetic induction and capacitive coupling (DC input – DC output)

This position freedom can be further improved by switching multiple electrodes during power transmission.

With this approach, only electrodes located near the equipment are in operation providing high-efficiency charging everywhere on the charging pad.

图6：This system does not cause noise problems, and has very little effect on the human body or equipment.

图7：Charge is possible everywhere on the charging pad.

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第二大特色：容易安装

Since, capacitive coupling is only required to provide the desired capacity between power transmitting and receiving electrodes, electrodes can be any shape. (Electrodes do not have to be square. They can be triangular or circular as well.)

Also there are very few limitations in terms of electrode materials and thickness, since only a few mA of current flow through electrodes.

We can flexibly accommodate customer requests for electrode shape, size and material to suit equipment requirements.

图8：Examples of electrode placement


图9:Mounting in low-profile equipment

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第三大特色：无线电能传输区域没有热量产生

Since less than a few mA of current flow through electrodes in capacitive coupling, as mentioned above, hardly any Joule heat (determined from current and resistance values) is emitted.

This means the temperature in the wireless power transmission area does not rise, which protects battery from heat even when the unit is placed nearby.

图10：Metal objects other than the equipment to be charged do not result in heat generation either.

村田无线充电模块特性：Wide charging area
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村田无线充电模块规格和外形图

Absolute maximum ratings



Electrical property (Ta=25°C)



Reference (The electrical property in the case of adding a DC-DC converter to the latter part of a power receiving module)



Outline Views
 

图11：Power transmitting module (LXWS10TTEA-014)

图12：Receiving module (LXWS10RTEA-015)