Pulse width modulation is used to reduce the total power delivered to a load without resulting in loss which normally occurs when a power source is limited by a resistive element.
脉宽调制技术是用来降低总功率交付给了负荷，没有造成损失，这是通常发生时，电源是有限的，由电阻芫件。
Wireless powering is a new technique, which can make power transferred to load without any physical connection.
无线供电是一种新兴的技术，可实现近距离、无接触电能传输。
High power utilization, low consumption without load, save energy.
电源利用率高，空载损耗小，节约能源。
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