2020 年 28 巻 2 号 p. 44-50
Transcutaneous energy transmission systems that supply power to the ventricular assist device implanted in the human body have been studied. The magnetic field radiated from a transcutaneous transformer exceeds the limit set by the international standard CISPR 11. Therefore, we proposed a magnetic-field-reduction method using both 0° and 180° phase-shift transformers. In this study, we measured the magnetic field both in the case of using a single transcutaneous transformer (Type A) and in the case of using a couple of transcutaneous transformers (Type B). The receiving power of the load resistance was fixed at 14.4 W. As a result, the magnetic field became 59.0 dBµA/m in Type A, and 49.3 dBµA/m in Type B. Furthermore, the transmission efficiency was 57.2% in Type A and it was 45.2% in Type B when the distance between the couple of transcutaneous transformers was 30 cm. These results indicated the effectiveness of our method in magnetic-field reduction.
