Results 281 to 290 of about 6,327 (313)

Paralleling DC/DC Switched Converters Based on Piezoelectric Transformers

2009 IEEE Industry Applications Society Annual Meeting, 2009
One of the most important advantages in using piezoelectric transformers (PT) is that they operate at high frequencies with a very good efficiency (1), tipically higher than 95%. This paper presents a DC/DC converter based on two piezoelectric transformers which duplicates the output voltage frequency ripple, maintaining the switching frequency.
Juan Diaz, Fernando Nuno, David Gacio, Pedro J. Villegas, Miguel J. Prieto   +4 more
openaire   +1 more source

DC transformer: Dream or reality?

Solid State Communications, 2006
We propose to use the exciton coupling between electrons and holes in different quantum wells to reach a strong Coulomb drag effect. The drag has to be really strong below the Mott transition when the most of the carriers are bound in excitons. We suggest to use the exciton drag for fabrication of DC transformer.
B. Laikhtman, P.M. Solomon
openaire   +1 more source

A Family of Zero-Voltage-Switching DC-DC Transformers

Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06., 2006
A family of zero-voltage-switching (ZVS) dc-dc transformers is proposed in the paper. Utilizing the magnetizing current, all switches can realize ZVS independent of input voltage and load. A ZVS push-pull forward dc-dc transformer is used to illustrate the concept. The switches' ZVS condition is theoretically analyzed.
Z. Yao, L. Xiao, Y. Yan
openaire   +1 more source

A Resonant DC–DC Transformer With Zero Current Ripple

IEEE Transactions on Power Electronics, 2007
The paper presents a resonant converter topology capable of providing zero ripple conditions at either its input or output current. The basic properties of the proposed topology are discussed in detail. The remarkable symmetry and the proportional voltages of the circuit allow it to maintain ripple-less current independent of the load or switching ...
Alexander Abramovitz, Keyue Smedley
openaire   +1 more source

DC-DC converter interphase transformer design considerations: volt-seconds balancing

IEEE Transactions on Magnetics, 1990
The author describes a technique by which two paralleled DC-to-DC converters can be made to share current equally. The problem is identified as being a volt-seconds imbalance across the interphase transformer. The imbalance is corrected by modifying the pulse width of one of the DC-to-DC converters.
openaire   +1 more source

Precise superconducting DC ratio transformer

Journal of Physics E: Scientific Instruments, 1973
An improved design for a precise superconducting DC ratio transformer is described in which DC ratios with accuracies better than 0.01 ppm have been achieved.
openaire   +1 more source

Bidirectional, High-Power DC Transformer

IEEE Transactions on Power Delivery, 2009
This paper studies a bidirectional dc-dc converter concept which is capable of achieving very high stepping ratios with MW level power transfers. The converter can find potential application in connecting high-power dc sources, interfacing to high-voltage dc transmission or to flexible ac transmission system elements.
openaire   +1 more source

TRANSISTORIZED DC-TO-DC CONVERTERS EMPLOYING PIEZOELECTRIC TRANSFORMERS

1963
Abstract : A transistorized dc-to-dc converter has been designed using a camic transformer. This converter is particularly adaptable to equipment used in measuring magnetic fields. The ceramic transformer provides further advantages of reduced size and complexity over flyback type pulse and resonant rf transformers, which require the use of many turns ...
openaire   +1 more source

Current Sharing Method for DC-DC Transformers

2014
Master of ...
openaire   +1 more source

Fully integrated isolated dc-dc converter using micro-transformers

2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition, 2008
We demonstrated a fully integrated isolated dc-dc converter using coreless micro-transformers. The transformers are switched resonantly at 170 MHz to achieve efficient energy transfer while the energy regulation is realized through a 500 KHz PWM feedback signal which controls the duty cycle that this 170 MHz resonant action is left on.
openaire   +1 more source