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New self-driven synchronous rectification system for converters with a symmetrically driven transformer

Author:
Fernández González, Arturo JoséUniovi authority; Sebastián Zúñiga, Francisco JavierUniovi authority; Hernando Álvarez, Marta MaríaUniovi authority; Villegas Saiz, Pedro JoséUniovi authority; García García, JorgeUniovi authority
Publication date:
2005
Publisher version:
http://dx.doi.org/10.1109/TIA.2005.853385
Citación:
IEEE Transactions on Industry Applications, 41(5), p. 1307-1315 (2005); doi:10.1109/TIA.2005.853385
Descripción física:
p. 1307-1315
Abstract:

Synchronous rectification (SR) is mandatory to achieve good efficiencies with low output voltages. If the transformer is driven asymmetrically without dead times, self-driven SR (SDSR) is a very interesting solution. However, if the transformer is driven symmetrically, the synchronous rectifiers are off during the dead times and, as a consequence, the efficiency is lowered. This paper deals with a new SDSR system that keeps the rectifiers on even during the dead times. Thus, it can be used to obtain very low output voltages, such as 1.5 V, with quite good efficiency. Moreover, it can be used over a wide input voltage range. The new system is implemented in a prototype in order to measure the real efficiency that can be achieved with the proposed scheme

Synchronous rectification (SR) is mandatory to achieve good efficiencies with low output voltages. If the transformer is driven asymmetrically without dead times, self-driven SR (SDSR) is a very interesting solution. However, if the transformer is driven symmetrically, the synchronous rectifiers are off during the dead times and, as a consequence, the efficiency is lowered. This paper deals with a new SDSR system that keeps the rectifiers on even during the dead times. Thus, it can be used to obtain very low output voltages, such as 1.5 V, with quite good efficiency. Moreover, it can be used over a wide input voltage range. The new system is implemented in a prototype in order to measure the real efficiency that can be achieved with the proposed scheme

URI:
http://hdl.handle.net/10651/19528
ISSN:
0093-9994
DOI:
10.1109/TIA.2005.853385
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