Research On Wireless Power Transmission System In Implanted Biologic Telemetry Instrument

The technology of wireless electricity energy transmission is a new technology in energy supply methods in the past ten years. Applying in the bioengineering area, this technology affords a more suitable way for the embed telemetry instrument. The development of the technology will improve the treatment condition and has far-reaching implications. The paper mostly studied a new wireless power transmission used to the embedded telemetry instruments. Its working principle : Class E power magnifier is used in the process of changing the DC into radio signal. The radio signal is converted to the RF energy by the resonant loop. Then the energy signal will be commuted, filtered and regulated. At last it meet to the CCD work voltage. This way can avoid the venture of infection and the problem of the limited time of the battery. The way how an outside energy is supplied to an inside biologic telemetry instrument is analyzed in this dissertation. After analyzing the character of the outside energy, the supply system can be divided into sending block, transmission block and receiving block. At first, the study on the power magnifier is perpetrated in the sending block. The Class E power magnifier is a single MOSFET power magnifier, and its change efficiency can reach above 85% by controlling the MOSFET. Secondly, the design of voltage regulator in the receiving block is analyzed in the paper. A differential amplifier is used as an error amplifier of the lower voltage regulator. Added with a reference voltage source which is not changing with outside temperature, this kind of error amplifier can afford a stable voltage, which is used as a working voltage in the telemetry instrument. After analyzing each block and confirming every parameter, the system is simulated and the output wave is very stable, which can reach the requirement. During the experiment, we can clearly understand the process of energy transmission. To reach higher transmission efficiency and better effect, more work and study should be done continuously.