Light-load efficiency improvement for zero-voltage switching boost integrated converters

2011 ◽  
Author(s):  
Hyun-Wook Seong ◽  
Hyoung-Suk Kim ◽  
Gun-Woo Moon ◽  
Myung-Joong Youn
Keyword(s):  
Efficiency Improvement ◽  
Zero Voltage Switching ◽  
Light Load ◽  
Zero Voltage ◽  
Voltage Switching

Multiple-Phase-Shift Control for a Dual Active Bridge to Secure Zero-Voltage Switching and Enhance Light-Load Performance

2018 ◽  
Vol 33 (6) ◽  
pp. 4584-4588 ◽  
Author(s):  
Allan Taylor ◽  
Guanliang Liu ◽  
Hua Bai ◽  
Alan Brown ◽  
Philip Mike Johnson ◽  
...  
Keyword(s):  
Phase Shift ◽  
Zero Voltage Switching ◽  
Dual Active Bridge ◽  
Shift Control ◽  
Multiple Phase ◽  
Light Load ◽  
Zero Voltage ◽  
Voltage Switching

Phase-shifted Series Resonant Converter with Zero Voltage Switching Turn-on and Variable Frequency Control

2017 ◽  
Vol 8 (3) ◽  
pp. 1184 ◽  
Author(s):  
Mohamed Salem ◽  
Awang Jusoh ◽  
Nik Rumzi Nik Idris ◽  
Tole Sutikno ◽  
Yonis.M.Yonis Buswig
Keyword(s):  
Output Voltage ◽  
Frequency Control ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Zero Voltage Switching ◽  
Light Load ◽  
Wide Range ◽  
Series Resonant ◽  
Zero Voltage ◽  
Voltage Switching

This paper presents a phase shifted series resonant converter with step up high frequency transformer to achieve the functions of high output voltage, high power density and wide range of Zero Voltage Switching (ZVS). In this approach, the output voltage is controlled by varying the switching frequency. The controller has been designed to achieve a good stability under different load conditions. The converter will react to the load variation by varying its switching frequency to satisfy the output voltage requirements. Therefore in order to maintain constant output voltage, for light load (50% of the load), the switching frequency will be decreased to meet the desired output, while for the full load (100%) conditions, the switching frequency will be increased. Since the controlled switching frequency is limited by the range between the higher and lower resonant frequencies , the switches can be turned on under ZVS. In this study, a laboratory experiment has been conducted to verify the effectiveness of the system performance.

Study of an Isolated DC-DC Converter for Fuel Cell Applications

2016 ◽  
Vol 839 ◽  
pp. 65-69
Author(s):  
Sakda Somkun ◽  
Shanmugham Prabhuraj ◽  
Chatchai Sirisamphanwong
Keyword(s):  
Fuel Cell ◽  
Output Voltage ◽  
High Efficiency ◽  
Load Range ◽  
Zero Voltage Switching ◽  
Analysis And Design ◽  
Switching Regimes ◽  
Light Load ◽  
Zero Voltage ◽  
Voltage Switching

This paper presents the analysis and design of a dual active bridge DC-DC converter for fuel cell applications. The zero voltage switching operating condition of such converter is analyzed to select an appropriate turn ratio of the high frequency transformer for a high efficiency operation. The ratio between the output voltage to the fuel cell voltage should be close to the transformer turn ratio to guarantee the zero voltage switching regimes at a light load. The prototype converter was designed to be suitable for the input voltage of 40 to 65 V and output voltage of 360 to 400 V with the transformer turn ratio of 7.33. The converter was tested with a 48 V DC power supply and with a polymer electrolyte membrane fuel cell stack. The maximum power of 700 W was delivered and the efficiency was better than 94% for the whole load range.

scholarly journals An Investigation of Zero-Voltage-Switching Condition in a High-Voltage-Gain Bidirectional DC–DC Converter

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1940
Author(s):  
Nhat-Truong Phan ◽  
Anh-Dung Nguyen ◽  
Yu-Chen Liu ◽  
Huang-Jen Chiu
Keyword(s):  
High Voltage ◽  
Switching Frequency ◽  
Maximum Output ◽  
Voltage Gain ◽  
Time Duration ◽  
Zero Voltage Switching ◽  
Light Load ◽  
High Voltage Gain ◽  
Zero Voltage ◽  
Voltage Switching

This paper analyzes the zero-voltage switching (ZVS) for all switches in a high-voltage-gain bidirectional DC–DC converter in triangular conduction mode (TCM) operation without any auxiliary components. From the ZVS condition, the reverse inductor current can be derived, and the required dead-time duration between the main switches and SR switches can be determined, which leads to a reduction in the duty cycle loss. Moreover, the relationship between switching frequency and load in TCM operation can be determined, which helps to reduce the peak-to-peak inductor current and reduce the conduction loss at light load. An experimental prototype of a high-voltage-gain bidirectional DC–DC converter is implemented with a maximum output power of 48 W. The result shows the peak efficiency of 97% and 96.8% in the forward and reverse directions, respectively.

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