ZHAO Jia yong, MAO Chun gang, CHEN Peng fei, CHEN Ting xun, YAO Qi guo

 

(School of Naval Architecture & Ocean Engineering, Zhejiang Ocean University, Zhoushan 316022, China)

 

 

Abstract: Aiming at the safety problems of traditional transfer electrical energy with wires, a research about transferring electrical energy with wireless, increasing of pulse driving ability and regulating resonant frequency to improve the transmission efficiency was done. And then, the factors which affect the delivery of wireless coil energy were analyzed, and a wireless power transmission device which based on the principle of magnetic coupling resonance was designed. The device consisted of transmitting module and receiving module. The transmission circuit generated accurate controlled frequency and realized the transmission by using the high pressure half bridge chip to drive half bridge power circuit. The receiving circuit was composed of a resonant circuit and a bridge rectifier, which changed AC voltage to DC voltage. Then the DC voltage could be used by loads. The results indicate that the device is stable, and can transmit the wireless power in a longer distance. When the loads are two 1 watt LED bulbs in series, they can be lighted up in 80cm. At the same time, the transmission efficiency can be improved higher in a short distance, so it is possible to use the device to charge a flashlight, MP3 or other lowpower electronic products.

 

Key words: wireless power; pulse driven; magnetic coupling resonance