Zierhofer M C, Hochmair E S
Institute of Experimental Physics, University of Innsbruck, Austria.
Int J Artif Organs. 1992 Jun;15(6):379-82.
This paper describes the inductive power and data link employed in the CAP Cochlear Prosthesis System (CAP stands for Combined Analog and Pulsative Stimulation Strategy). The inductive link consisting of a parallel-tuned receiver resonant circuit weakly coupled to a series-tuned transmitter resonant circuit, is driven by a self-oscillating class-E-tuned power amplifier. The class-E concept allows coupling-insensitive high-efficiency transcutaneous transmission of power. In the CAP implant, variations of the coil distance within a range of 0 to 9 mm result in changes of the implant supply voltage which are lower than 10%. Within this coil distance range, the mean overall efficiency is 49%. In view of the excellent switching properties of the class-E tuned power oscillator, a practical scheme for data transmission is ASK (Amplitude Shift Keying). To ensure constant energy flow and easy synchronization of the bitstream in the implant, a self-clocking bit format is employed.
本文描述了CAP人工耳蜗系统中采用的感应供电和数据链路（CAP代表模拟与脉冲刺激组合策略）。感应链路由一个与串联调谐发射谐振电路弱耦合的并联调谐接收谐振电路组成，由一个自振荡E类调谐功率放大器驱动。E类概念允许实现对耦合不敏感的高效经皮功率传输。在CAP植入物中，线圈距离在0至9毫米范围内变化时，植入物电源电压的变化低于10%。在此线圈距离范围内，平均总效率为49%。鉴于E类调谐功率振荡器具有出色的开关特性，一种实用的数据传输方案是幅移键控（ASK）。为确保植入物中能量流恒定且比特流易于同步，采用了自计时比特格式。
