Showing 2 results for Emc
A. Hajiaboli, Hodjat-Kashani, M. Omidi,
Volume 3, Issue 3 (7-2007)
Abstract
This paper presents a novel implementation of an electromagnetically coupled
patch antenna using air gap filled substrates to achieve the maximum bandwidth. We also
propose an efficient modeling technique using the FDTD method which can substantially
reduce the simulation cost for modeling the structure. The simulated results have been
compared with measurement to show the broadband behavior of the antenna and the
accuracy of the proposed modeling technique. The measured results show a 16% of
VSWR<2 bandwidth which is considerable considering the inherent bandwidth limitations
in microstrip antenna technology.
A. Nemati, M. Pakdel,
Volume 6, Issue 3 (9-2010)
Abstract
A novel ZVZCS isolated dual series-resonant active-clamp dc–dc converter is
proposed to obtain high efficiency. The proposed converter employs an active-clamp
technique, while a series-resonant scheme controls the output voltage with the complementary
pulse width modulation controller. The active-clamp circuit serves to recycle the energy
stored in the leakage inductance or the magnetizing inductance and provides zero-voltage and
zero-current turn-on and turn off switching. The voltage stresses of the main switch are
clamped. The voltage transient spikes across the dual series active clamp circuit and the
current stress of the current-fed side switches are limited by auxiliary active clamping circuits
on both sides, and ZVZCS is achieved. The operating principles and design considerations are
discussed and verified by simulations using PSIM software. Also, the EMI reduction
techniques from EMC point of view in the circuits related to converters has been pointed out.