Highly Efficient Ultra-Wideband Impulsive Wireless Power Transmission Systems

• Main Authors: Chun-ChihLo, 羅濬智
• Other Authors: Chin-Lung Yang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/16682972587768968251

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 98 === This thesis applies UWB technologies in a special aspect for the transmission of energy rather than messages to achieve a novel wireless impulsive powering approach. An UWB transmitter utilizing wireless impulsive powering is implemented. Advanced Design System (ADS), the integrated circuit simulation software, is applied to design,investigate, and analyze the circuits of the impulsive wireless power transmission systems. The whole wireless power transmitting and receiving systems are implemented to validate the feasibility of the wireless impulsive powering and the conversion efficiency of the rectifier circuitry. Experimental results prove that this technique is quite suitable for low input power transmission and biomedical applications. The UWB pulse generator is designed and developed to fulfill the UWB power transmission. The UWB pulse generator uses step recovery diodes (SRD) combined with discrete components to produce a low ringing and well symmetry monocycle pulse whose peak-to-peak amplitude ranges from 310 mV to 876 mV and pulse width remains 290 ps. In order to achieve the UWB impulsive wireless powering, the bandwidth and amplitude of the UWB pulse shall be considered for sufficient transmission power. For biomedical implant chips and devices, the broadband 6-GHz power amplifier (2GHz-8GHz) is attached to increase the deliverable power of the wireless UWB power supplier. The UWB impulsive wireless transmission systems include an UWB pulse generator, a broadband power amplifier, an UWB antenna, and a voltage-doubler rectifier. Each module is implemented and the whole system is integrated and valiated. In order to deliver the UWB power efficiently, a horn antenna with high directivity, large gain, and broad bandwidth acts as the transmit antenna. The power of impulsive signals generated by the UWB pulse generator is amplified by the broadband power amplifier and then delivered through the horn antenna. And the received impulsive power is converted by the voltage-doubler rectifier composed of Schottky diodes into a direct current (DC) power to supply the chips or batteries. In this thesis, the UWB impulsive wireless transmission systems have been proved to achieve high power conversion efficiency (PCE), larger than 80% even when the input power of the rectifier is lower than 0 dBm. Due to the fact that low transmission power has relatively little impacts and causes relatively slight injury to human bodies, it is one of the essential key technologies in biomedical implant chips and devices. Compared to the traditionally continuous wave (CW) powering systems recfiliers oprated at the optimal transmission efficiency condition setup and the specific value load resistor, the overall transmission power to recfilier has been reduced by at least 80%, and the transmission efficiency can still achieve up to 80%. At the operation condition of the optimal power efficiency (the pulse generator is trigger by the 40MHz 2Vpp to 5Vpp square waves, the conversion efficiency of our proposed impulsive system attains to more than 90%, which is the outstanding. These research results will contribute to and make significant impacts on wireless remote powering systems for biomedical implant devices in the future.