Zimmerman Mark D, Chaimanonart Nattapon, Young Darrin J
Dept. of Electr. Eng., Case Western Reserve Univ., Cleveland, OH 44106, USA.
Conf Proc IEEE Eng Med Biol Soc. 2006;2006:2506-9. doi: 10.1109/IEMBS.2006.259571.
An optimized remote powering architecture with a miniature and implantable RF power converter for an untethered small laboratory animal inside a cage is proposed. The proposed implantable device exhibits dimensions less than 6 mmx6 mmx1 mm, and a mass of 100 mg including a medical-grade silicon coating. The external system consists of a Class-E power amplifier driving a tuned 15 cmx25 cm external coil placed underneath the cage. The implant device is located in the animal's abdomen in a plane parallel to the external coil and utilizes inductive coupling to receive power from the external system. A half-wave rectifier rectifies the received AC voltage and passes the resulting DC current to a 2.5 kOmega resistor, which represents the loading of an implantable microsystem. An optimal operating point with respect to operating frequency and number of turns in each coil inductor was determined by analyzing the system efficiency. The determined optimal operating condition is based on a 4-turn external coil and a 20-turn internal coil operating at 4 MHz. With the Class-E amplifier consuming a constant power of 25 W, this operating condition is sufficient to supply a desired 3.2 V with 1.3 mA to the load over a cage size of 10 cmx20 cm with an animal tilting angle of up to 60 degrees, which is the worst case considered for the prototype design. A voltage regulator can be designed to regulate the received DC power to a stable supply for the bio-implant microsystem.
提出了一种优化的远程供电架构，该架构带有一个微型可植入射频功率转换器，用于笼内无束缚的小型实验动物。所提出的可植入设备尺寸小于6 mm×6 mm×1 mm，包括医用级硅涂层时质量为100 mg。外部系统由一个E类功率放大器组成，该放大器驱动一个放置在笼子下方的调谐15 cm×25 cm外部线圈。植入设备位于动物腹部与外部线圈平行的平面内，并利用电感耦合从外部系统接收电力。一个半波整流器对接收的交流电压进行整流，并将产生的直流电流输送到一个2.5 kΩ的电阻器，该电阻器代表可植入微系统的负载。通过分析系统效率，确定了关于每个线圈电感器的工作频率和匝数的最佳工作点。确定的最佳工作条件基于一个4匝的外部线圈和一个20匝的内部线圈，工作频率为4 MHz。在E类放大器消耗恒定功率25 W的情况下，这种工作条件足以在10 cm×20 cm的笼子尺寸范围内，以高达60度的动物倾斜角度（这是原型设计考虑的最坏情况）向负载提供所需的3.2 V电压和1.3 mA电流。可以设计一个电压调节器，将接收的直流功率调节为生物植入微系统的稳定电源。
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