High-Efficiency Regulation Method for a Zero-Current and Zero-Voltage Current-Fed Push–Pull Converter

2011 ◽  
Vol 26 (2) ◽  
pp. 444-452 ◽  
Author(s):  
José M. Blanes ◽  
Ausias Garrigos ◽  
José A. Carrasco ◽  
Juan Ejea-Martí ◽  
Esteban Sanchis-Kilders
Keyword(s):  
High Efficiency ◽  
Zero Current ◽  
Regulation Method ◽  
Zero Voltage

Single-Switch Soft-Switched Boost Power Factor Corrector for Modular Applications

2016 ◽  
Vol 7 (2) ◽  
pp. 279
Author(s):  
Tomas A. Gonzalez ◽  
Daniel O. Mercuri ◽  
Hernan E. Tacca ◽  
Maximo E. Pupareli
Keyword(s):  
Power Factor ◽  
High Power ◽  
High Efficiency ◽  
Magnetic Components ◽  
Dc Power ◽  
Zero Current ◽  
Three Phase ◽  
Power Factor Corrector ◽  
Zero Voltage ◽  
Efficiency And Reliability

Modern dc power supplies provide power factor correction but the classical two-stage approach, using hard-switched preregulators, has detrimental effects on efficiency and reliability, particularly for high power applications. With some circuit modifications and the addition of a few magnetic components, diodes and capacitors, we have turned a classical boost power factor corrector into a high efficiency soft-switched version. The proposed converter turns on its single switch with zero current and turns it off with zero voltage. In this paper we explain the proposed changes, we study the waveforms and equations and we verify them with an experimental prototype. We also show how the converter can be used for modular single- and three-phase high power applications.<br /><br />

Zero‐voltage zero‐current switching DC/DC converter with high step‐up and high efficiency

2016 ◽  
Vol 52 (14) ◽  
pp. 1250-1252 ◽  
Author(s):  
Xuefeng Lin ◽  
Jianping Xu ◽  
Xiang Zhou ◽  
Guohua Zhou
Keyword(s):  
High Efficiency ◽  
Current Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Zero Voltage

scholarly journals Ultracapacitors Utilization for Automotive Applications

10.14311/1153 ◽  
2010 ◽  
Vol 50 (1) ◽  
Author(s):  
Z. Pfof ◽  
P. Vaculík
Keyword(s):  
Fuel Cell ◽  
High Efficiency ◽  
Soft Switching ◽  
Drive Unit ◽  
Basic Principles ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Zero Voltage ◽  
Very High

This paper describes the basic properties of ultracapacitors and a converter for ultracapacitors with application zero-voltage switching (ZVS). Because of the very high efficiency of the ultracapacitor, the efficiency of the converter for ultracapacitors also has to be high; otherwise, the converter reduces efficiency of the whole drive unit. Further, the paper describes the drive unit concept for the CityEl electric vehicle, with the use of ultracapacitors in cooperation with a fuel cell. This co-operation with ultracapacitors is useful for the supply unit as a fuel cell, which cannot deliver peak power in dynamic conditions while maintaining its nominal efficiency. However, this poses no problems for ultracapacitors.There is also a description of the basic principles of soft switching using zero-voltage and zero-current switching together with a comparison of the power losses between hard and soft switching. 

A high-efficiency regulation technique for a zero-voltage zero-current power switching converter

1998 ◽  
Vol 13 (4) ◽  
pp. 739-747 ◽  
Author(s):  
J.A. Carrasco ◽  
A.H. Weinberg ◽  
E. Maset ◽  
E.J. Dede
Keyword(s):  
High Efficiency ◽  
Power Switching ◽  
Switching Converter ◽  
Zero Current ◽  
Zero Voltage

scholarly journals Optimal Design of LLC Resonant DC Transformer under Adaptive Frequency Tracking Strategy

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2160
Author(s):  
Yu Tang ◽  
Dekai Kong ◽  
Chenxu Duan ◽  
Hao Sun
Keyword(s):  
Working Condition ◽  
Transmission Efficiency ◽  
Switching Frequency ◽  
Optimal Operating ◽  
Frequency Tracking ◽  
Zero Current ◽  
Llc Resonant Converter ◽  
Dc Transformer ◽  
Zero Voltage ◽  
Tracking Strategy

In recent years, the LLC (inductor–inductor–capacitor) DC transformer has been widely used in communication and computer power supply because of its advantages of zero voltage conduction of primary switch and zero current turn off concerning the output rectifier diode. To obtain higher transmission efficiency and make the LLC DC transformer always run at the optimal operating point, the switching frequency of the LLC DC transformer should work at the resonance frequency of the circuit. In actual conditions, the optimal operating frequency of the LLC DC transformer will be changed due to the influences of the working condition on the circuit parameters and the load change. Therefore, the LLC DC transformer controlled by the fixed frequency mode will not be in the best working condition. In this paper, an adaptive frequency tracking method is used to control the circuit; when the circuit parameters change, the LLC DC transformer can always be in the best working state. Then, the influence of circuit parameters such as output power and excitation inductor on the optimal working point of the LLC DC transformer is analyzed in detail. Finally, a 1 kW LLC resonant converter prototype is designed under laboratory conditions to verify the feasibility of the control strategy.

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