Synchronous rectifiers versus Schottky diodes: a comparison of the losses of a synchronous rectifier versus the losses of a Schottky diode rectifier

Blake, C.; Kinzer, D.; Wood, P. A. D.

doi:10.1109/apec.1994.316424

Cited by 52 publications

(13 citation statements)

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“…These high current values may yield to high losses in the output stage of the electronic driver. Synchronous rectification can be applied to diminish these losses [7] [8]. …”

Section: Selected Load Configurationmentioning

confidence: 99%

Evaluation of a Synchronous Flyback Driving Parallelized High Efficiency LEDs

Garcia

Ramos

Lamar

et al. 2007

2007 IEEE International Symposium on Industrial Electronics

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In this paper, parallel connection of High Efficiency LEDs for lighting applications is studied. Unlike series connection, parallel connection of LEDs allows the operation of these devices at different current levels. Among other features, this allows the operation of the remaining LEDs if one of them fails. The main drawback of parallel connection is, as is very well known, current equalization and stable operation, due to the V vs. I characteristic of the LED. An active equalization and current limitation with MOSFETs is studied and implemented, thus obtaining a high current-low voltage power load.To supply this load, a 16 W synchronous flyback is used, in order to supply 4 High Efficiency LEDs. The overall prototype design and construction is discussed, and electrical and light measurements are presented.

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“…These high current values may yield to high losses in the output stage of the electronic driver. Synchronous rectification can be applied to diminish these losses [7] [8]. …”

Section: Selected Load Configurationmentioning

confidence: 99%

Evaluation of a Synchronous Flyback Driving Parallelized High Efficiency LEDs

Garcia

Ramos

Lamar

et al. 2007

2007 IEEE International Symposium on Industrial Electronics

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“…Synchronous Rectification (SR) is mandatory to achieve good efficiencies in low output voltage converters [1][2][3][4][5][6][7]. A very reasonable 0.4 V drop in a Schottky diode means a 11% efficiency drop alone in a 3.3V output.…”

Section: Proposed Synchronous Rectification Systemmentioning

confidence: 99%

28V bus solar array regulator based on converters with transformer and self-driven Synchronous Rectification

Fernández

Carbonnier

Mourra

et al. 2012

2012 IEEE Energy Conversion Congress and Exposition (ECCE)

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Satellite power systems are generally based on non isolated topologies. Simplicity, robustness and high efficiency are the key parameters and hence, these topologies are the leaders. However, extra switches are needed for protection; the design of the MOSFET drivers is not so simple if a full excursion from 0% to 100% is needed; the design has to be changed accordingly with the design of the solar array. An alternative concept is proposed in this paper and is based on topologies with transformer. Less switches are needed for protection and just by changing the transformer turns ratio, the converter can accommodate different designs of solar arrays. The main drawback is the efficiency, which is a key player in the space power systems. To overcome this, a Synchronous Rectification system is proposed in order to boost the efficiency with respect to the diode version counterpart. A new system based on the output inductor waveforms is also proposed in this paper.

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“…Synchronous Rectifi cation (SR) is mandatory to achieve good effi ciencies in low output voltage converters [1][2][3][4][5][6][7]. Nowadays, the most widely used topology for this application is the synchronous buck converter.…”

Section: Introductionmentioning

confidence: 99%

Self-Driven Synchronous Rectification System for Converters with Symmetrically Driven Transformer Based on the Use of the Output Inductor

Fernández

Sebastián

Hernando

et al.

Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06.

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Synchronous Rectifi cation (SR) is mandatory to achieve good effi ciencies with low output voltages. If the transformer is driven asymmetrically without dead times, Self-Driven Synchronous Rectifi cation (SDSR) is a very interesting solution. However, if the transformer is driven symmetrically, the synchronous rectifi ers are off during the dead times and, as a consequence, the effi ciency is lowered. This paper deals with the optimisation of a SDSR system that keeps the rectifi ers on even during the dead times. The system is based on using the output inductor to turn the SR on and the power transformer waveform to turn them off. Hence, the most important parameters have been studied in order to obtain the highest possible effi ciency. This system is very interesting because it can be used in any topology with a symmetrically driven transformer independently of the output voltage level and for a wide input voltage range. The system has been implemented in a prototype in order to measure the real effi ciency that can be achieved with the proposed scheme and compared with the effi ciency of the same prototype without SDSR.

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Synchronous rectifiers versus Schottky diodes: a comparison of the losses of a synchronous rectifier versus the losses of a Schottky diode rectifier

Cited by 52 publications

References 1 publication

Evaluation of a Synchronous Flyback Driving Parallelized High Efficiency LEDs

Evaluation of a Synchronous Flyback Driving Parallelized High Efficiency LEDs

28V bus solar array regulator based on converters with transformer and self-driven Synchronous Rectification

Self-Driven Synchronous Rectification System for Converters with Symmetrically Driven Transformer Based on the Use of the Output Inductor

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