箱型シールドによる空芯偏平型経皮電力伝送用トランスから発生する放射性妨害波の抑制

－シールドの材料・厚さ・形状を変化させた場合－

抄録

　Transcutaneous energy transmission system (TETS) has been investigated as an alternative to wired power transmission systems to ventricular assist device. However, TETS has various drawbacks, one of which is the generation of radiated emission from a transcutaneous transformer at 400 kHz. If the emission exceeds the permissible limits of CISPR11 international standard, peripheral equipment may malfunction. In this study, we attempted to suppress radiated emission by enclosing a transcutaneous transformer, which is the main source of radiated emission at low frequency, with a conductive metal box-shaped shield less than 0.3 mm. As a result, a copper plate with a thickness of 0.096 mm showed the best suppression of 14.43 dBµA/m compared to the case without a shield. The next best suppression of 13.10 dBμA/m was achieved with a perforated aluminum plate 0.297 mm thick. The results of this study indicate that material and shape of shielding are more related to the suppression of radiated emission than the thickness of the shielding.