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PCIM 2017 – Sunday, May14th – Monday, May 15th

In May 2017, at PCIM 2017 in Nuremberg, Ionel Dan Jitaru from Rompower Energy Systems will present a seminar and a tutorial
Seminar – Sunday, May 14th  “Modern Magnetic Technologies for High Efficiency and High Power Density “
Tutorial – Monday, May 15th  “New Trends in Power Conversion for Very High Efficiency and High Power Density”


PCIM 2017 – Key Note Paper – Thursday May 18th

On May 18th 2017 Ionel Dan Jitaru will present a Key Note paper entitled “Evolution in Topologies as a Result of new Devices and Enabling Technologies”
Click Here  for more information on PCIM 2017 programs


APEC 2017 March 26-30 Tampa

At APEC 2017 in Tampa (March 26-30), Rompower Energy Systems had introduced the latest 65W adapter with the word’s highest efficiency over the entire input voltage range and a power density above 20W/in3.  Click here for more information.


A Family of High Efficiency Variable Frequency Soft-Switching Off-line DC-DC Converters

The paper presents a family of off-line DC-DC converters for medium to high power delivering more than 95% efficiency for output levels of 12 to 48 V. The multi-layer PCB solution allows for low profile converters with multiple applications, from AC-DC adapters to TELECOM and computing. The main gain of this new design approach consist in using variable frequency topology with high frequency zero voltage switching (ZVS) and zero current switching (ZCS) for primary switchers. Theoretical considerations and practical results are presented for high frequency and high voltage soft-switching. The goal of the designs is to maintain a reasonable temperature rise of the multi-layer PCB board while delivering up to 90 W and respective 750 W power in a reduced volume and low cost.


750W High Efficiency and Soft-Switching Off-Line 12 V Converter

The paper presents an innovative off-line low profile converter design that delivers 750 W of power at 95%-96% efficiency for nominal input range, using variable frequency topology with high frequency zero voltage switching (ZVS) and zero current switching (ZCS) for primary switchers. Theoretical considerations and practical results are presented for high frequency and high voltage soft-switching. The goal of the design is to maintain a reasonable temperature rise of the multi-layer PCB board while delivering 750 W power in a reduced volume and low cost. The resulting product increases more than twice the power density compared to the standard two stages 400V to 12V power converters and outperforms other one stage solutions in a 125 x 70 mm2 footprint with only a 18 mm profile.


High Efficiency Adapter Using Dual Switch PFC-Flyback Single Stage

The paper presents an innovative design that delivers 85W of power at more than 91% efficiency in a low profile using a high frequency quasi-resonant fly-back topology with synchronous rectification, and improved power factor based on dual switch method. A closed to 0.9 power factor is achieved employing only one magnetic element and two primary side switchers. A significant power density increase is obtained due to a combination of smaller bulk capacitor and a smaller magnetic element.


High Efficiency 100W Quasi-Resonant Multi-Phases Interleaved PFC Using Planar Magnetic Components

The paper presents an innovative PFC design that delivers 100 W of power at 96%-97% efficiency for nominal input range, in low profile using a high frequency quasi-resonant interleaved boost topology, while maintaining a reasonable low cost of the ac-dc adapter. Theoretical considerations and practical results for high frequency interleaved boost converters are described. The goal of the design is maintaining a reasonable temperature rise of the case while delivering 100W power in a reduced volume. The resulting product increases more than twice the power density compared to the standard notebook universal adapters.


ZVS and ZCS High Efficiency Low Profile Adapter

The paper presents an innovative design that delivers 65W of power at more than 91% efficiency in a footprint of a business card using a high frequency quasi-resonant fly-back topology with synchronous rectification, while maintaining a reasonable low cost of the AC/DC adapter. Topology and techniques for obtaining ZVS and ZCS for high frequency and high voltage switching are described. The goal of the design is maintaining a reasonable temperature rise of the case while delivering 65W power in a reduced volume. The resulting product increases more than twice the power density compared to the standard notebook adapters.


Increasing The Efficiency In High Current And Low Voltage Application

The paper will present a converter design targeted to push the performance in respect of efficiency and power density while reducing the cost. The innovation will come from the topology, magnetic structure, drive circuit and the control method. It will present a group of innovation which together lead to a design with outstanding performance.These technologies will be implemented in a 12V output voltage bus converter for HP , delivering 450W with limited airflow.


Magnetic Integration For High Density And High Efficiency Applications

The tutorial will present a comprehensive overview of the integrated and quasi-integrated magnetic concepts and implementations. In the quest for higher power densities and higher efficiency integrated magnetic structures have become more popular. There will be presented many forms of integrated magnetic in close correlation with converter topologies. Included are several structures wherein the transformer and the storage elements are placed on the same magnetic core, forming the traditional integrated magnetic with emphasis on the latest trends. In addition to this will be presented structures wherein two independent power trains are placed on the same standard magnetic core and structures wherein the main transformer and a signal transformer are sharing the same magnetic core without interference. The focus for the integrated magnetic will be for low profile and or planar magnetic structures. Ripple steering in new applications will also be presented. There will be presented the advantages of different forms of magnetic integration in very high current and low voltage application. The seminar will also show present and future trends in magnetic integration and new forms of planar magnetic.


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