scholarly journals Bidirectional Soft Switching Three-Phase Interleaved DC-DC Converter for a Wide Input Voltage Range

2015 ◽  
Vol 20 (4) ◽  
pp. 313-320 ◽  
Author(s):  
Woo-Jin Choi ◽  
Kyo-Beum Lee ◽  
Gyu-Bum Joung
Keyword(s):  
Input Voltage ◽  
Soft Switching ◽  
Voltage Range ◽  
Three Phase

scholarly journals Three-Phase Three-Level Isolated DC-DC Soft Switching Converter For Solar Applications

2021 ◽  
Vol 9 (2) ◽  
pp. 443-451
Author(s):  
K.Girinath Babu, Et. al.
Keyword(s):  
Input Voltage ◽  
Soft Switching ◽  
Leakage Inductance ◽  
Switching Converter ◽  
Three Phase ◽  
Voltage Stress ◽  
Converter Topologies ◽  
Total Leakage ◽  
Converter Topology ◽  
Output Filter

Three-level isolated DC-DC converter is an attractive topology in high input voltage applications, which can provide the voltage stress of the power devices to only a half of the dc voltage and also reduce the size of dc filter requirement. But major limitations in the existing three level ZVS converter topologies are brought out with an increased inductance in the primary side and it required to provide complete ZVS of all primary devices down to light loads. By employing an external inductance in the primary of the transformer, total leakage inductance of the transformer increases which is required for realization of soft switching of the converter switches but there are some disadvantages of connecting external inductance in the primary of the transformer. To overcome all these drawbacks, the     three-phase three-level isolated DC-DC soft switching converter has been proposed in order to reduce voltage and current stresses. This converter topology requires less number of control switches and operates with an asymmetrical duty cycle control. The proposed three level DC-DC converters provide two- level voltage waveform before dc output filter, which significantly reduce the size of dc output filter. The proposed work has been implemented using MATLAB/SIMULINK and the performance of the proposed converter is verified through simulation results.  

scholarly journals A Variable-Structure Multi-Resonant DC–DC Converter with Smooth Switching

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2240 ◽  
Author(s):  
Mengying Chen ◽  
Yifeng Wang ◽  
Liang Yang ◽  
Fuqiang Han ◽  
Yuqi Hou ◽  
...  
Keyword(s):  
Control Method ◽  
Variable Structure ◽  
Input Voltage ◽  
Soft Switching ◽  
Voltage Fluctuation ◽  
Voltage Range ◽  
Operating Modes ◽  
Transient Control ◽  
Power Switches ◽  
Smooth Switching

In this paper, a variable-structure multi-resonant soft-switching DC–DC converter and its transient smooth control method are proposed. Through the introduction of auxiliary switches, the converter can flexibly adjust its structure among three operating modes. Two switching processes can be obtained. Thus, a wide voltage gain range is achieved within a narrow frequency range. Moreover, to eliminate the large voltage fluctuation during modes switching, a drive signal gradual adjustment control method is proposed. Consequently, smooth switching between different modes can be realized and the voltage fluctuation is suppressed effectively. Finally, a 200 W experimental prototype is established to verify the theoretical analyses. Soft-switching performances for power switches and diodes are both guaranteed. The highest efficiency is 98.2%. With the proposed transient control method, a basically constant 400 V output voltage is ensured within a wide input voltage range (80 V–600 V). In particular, the transient voltage fluctuations during two switching processes decrease from 38.4 V to 10.8 V and from 37.2 V to 8.4 V, respectively.

scholarly journals Conceptualization and Analysis of a Next-Generation Ultra-Compact 1.5-kW PCB-Integrated Wide-Input-Voltage-Range 12V-Output Industrial DC/DC Converter Module

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2158
Author(s):  
Gustavo C. Knabben ◽  
Grayson Zulauf ◽  
Jannik Schäfer ◽  
Johann W. Kolar ◽  
Matthias J. Kasper ◽  
...  
Keyword(s):  
Power Density ◽  
Low Cost ◽  
Input Voltage ◽  
Soft Switching ◽  
Production Costs ◽  
Power Supplies ◽  
Next Generation ◽  
Peak Efficiency ◽  
Voltage Range ◽  
Loss Models

The next-generation industrial environment requires power supplies that are compact, efficient, low-cost, and ultra-reliable, even across mains failures, to power mission-critical electrified processes. Hold-up time requirements and the demand for ultra-high power density and minimum production costs, in particular, drive the need for power converters with (i) a wide input voltage range, to reduce the size of the hold-up capacitor, (ii) soft-switching over the full input voltage and load ranges, to achieve low losses that facilitate a compact realization, and (iii) complete PCB-integration for low-cost manufacturing. In this work, we conceptualize, design, model, fabricate, and characterize a 1.5kW, 12 V-output DC/DC converter for industrial power supplies that is required to operate across a wide 300 V–430 V input voltage range. This module utilizes an LLC-based control scheme for complete soft-switching and a snake-core transformer to divide the output current with a balanced flux among multiple secondary windings. Detailed loss models are derived for every component in the converter. The converter achieves close to 96 peak efficiency with a power density of 337 W/3 ( 20.6kW/d3m), excellent matching to the derived loss models, and zero-voltage switching even down to zero load. The loss models are used to identify improvements to further boost efficiency, the most important of which is the minimization of delay times in synchronous rectification, and a subsequent improved 1.5kW hardware module eliminates nearly 25% of converter losses for a peak efficiency of nearly 97% with a power density of 308 W/3 ( 18.8kW/d3m). Two 1.5kW modules are then paralleled to achieve 3 kW output power at 12 V and 345 W/3 ( 21.1kW/d3m) with ideal current sharing between the secondary outputs and no drop in efficiency from a single module, an important characteristic enabled by the novel snake-core transformer.

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