Multiwinding-transfomer-based (MTB) dc-dc converter did emerge in the last 25 years as an interesting possibility to connect several energy systems and/or offer higher power density because of reduction transformer core material and stages. MTB converters can be considered compromise between nonmodular a modular since they are themselves construction. This eventually leads some fault-tolerant p...

Many industrial and commercial sensitive loads are subject to the voltage sags and interruptions. The static transfer switch (STS) based on the thyristors is applied to improve the power quality and reliability. However, the transfer will result in severe inrush current in the load transformer, because of the DC component in the magnetic flux generated in the transfer process. The inrush curren...

This paper presents a high efficiency asymmetrical pulse width modulated dc-dc converter for photovoltaic application. The proposed dc-dc converter reduces the switching losses and current loss by zero voltage switching techniques. Moreover, the resonant circuit composed of the leakage inductance of the transformer and the blocking capacitor provides the zero-current switching (ZCS) turn-off fo...

This paper presents a high step-down tranformerless single-stage single-switch ac/dc converter suitable for universal line applications (90–270 Vr m s ). The topology integrates a buck-type power-factor correction (PFC) cell with a buck–boost dc/dc cell and part of the input power is coupled to the output directly after the first power processing. With this direct power transfer feature and sha...

This paper presents a new three-phase step-up dc–dc converter with a three-phase high-frequency (HF) isolation transformer in a current-mode controlled closed loop. The converter’s main characteristics are reduced input ripple current, step-up voltage, HF transformer, reduced output voltage ripple due to threepulse output current, and the presence of only three active switches, this being a mai...

modeling of 3-legged, 3-phase transformers under DC biasing is a challenging topic due to the need to have an adequate representation of flux paths beyond the active part including the tank. The main contribution of this paper is to present a new dual circuit model which takes the off—core flux path into consideration. An equivalent circuit is developed for this off-core path including equivale...

This paper presents high boost isolated dc-dc converter with closed loop control to provide high voltage regulation control suitable for renewable energy source. The circuit consists of active clamp circuit and boost converter with isolated transformer. The circuit employs capacitors are charged in parallel and discharged in series by isolated transformer inductors. The active clamp circuit is ...

A 19-channel DC SQUID based neuromagnetometer is under construction at the University of Twente (UT). Except for the cryostat all elements of the system are developed at the UT. It comprises 19 wire-wound first-order gradiometers in a hexagonal configuration. The gradiometers are connected to planar DC SQUIDs fabricated with a Nb/Al, AlO kappa/Nb technology. For this connection we developed a m...