應用於植入式生醫系統之電感耦合電源設計

Abstract

在癲癇偵測與刺激的應用上，生醫元件必須要植入人體體內。由於目前的電池技術，還是沒有辦法提供足夠長的操作時間給生醫元件使用，所以植入生醫元件的病人必須在電池能量耗盡後再開刀，已更換能量耗盡的電池。為了解決這樣的問題，在本論文中，採用近場無線傳能的方式去充電植入的電池或直接提供無線電源給植入的生醫元件使用。在這論文裡，我們設計並解實作了一個 20mA輸出電流、13.56 MHz 的互補式金氧半主動式整流器和可提供在10MHz有-58.49dB電源訊抑制的線性穩壓器。另外並設計了一個啟動控制電路，讓主動式整流器可以穩定的啟動。最後整體的近場電感耦合電源可以只輸出11.5mV的雜訊和達到轉換效率76.3%。

For epilepsy detection and stimulation application, the medical device should be fully implantable. The currently battery technology still cannot stand for an enough time for medical devices operation (about 1 year), the patient need additional surgery to replace the exhausted battery annually [1]. To solve this problem, a near-field inductive energy transmission to recharge battery or provide power supply for implantable biomedical devices is adopted. We have developed and fabricated a 20-mA output current CMOS active rectifier operated at 13.56MHz and a high power supply rejection (PSR) LDO regulator with -58.49dB PSR up to 10MHz. An additional start control circuit is designed for CMOS active rectifier to make the CMOS active rectifier start up robustly. The fabricated inductive link power supply has low peak-to-peak output ripple of 11.5mV and high power conversion efficiency of 76.3%.