胶囊内窥镜能量接收稳定性研究

提出了用三维接收线圈组成接收电路,解决由于无线胶囊内窥镜在人体消化道内姿态不确定所带来的接收能量不稳定问题.分析了由三维接收线圈组成的不同接收电路的接收效果,得出了对每一维线圈单独全桥整流后再并联输出的电路结构是最适合于为胶囊内窥镜供能的电路.计算了该接收电路的输出范围,并通过试验对其进行了验证.结果表明:当发射功率为 25 W时,胶囊内窥镜可在姿态任意变化的情况下获得320 mW以上可用能量,满足其高清晰度、高帧率功能对能量的需求.

Study on stability of power receiving for capsule endoscopes

To solve the instability of power receiving of capsule endoscopes due to the indetermination of its origination in alimentary tract, a power receiver composed of a three-dimensional (3-D) receiving coil is put forward in this study. The receiving effects of different circuits assembled from this 3-D coil were evaluated, and a circuit with the structure of parallel connection after full-bridge rectifying was chosen as the appropriate one. Output range of the circuit was calculated and experiments were carried out to validate its performance. Results show that up to 320 mW usable power can be steadily received by the capsule endoscope regardless of its orientation when the input power is 25 W, and the power transmission system based on this 3-D receiving coil can delivery enough power to the capsule endoscopes for the functions of higher image quality and faster frame rate.