scholarly journals DC-DC High Voltage Gain Switched Capacitor Converter With Multilevel Output Voltage and Zero-Voltage Switching

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 129692-129705
Author(s):  
Szymon Folmer ◽  
Robert Stala
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
Zero Voltage Switching ◽  
High Voltage Gain ◽  
Switched Capacitor Converter ◽  
Zero Voltage ◽  
Voltage Switching

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.

A ZVS DC-DC Converter with High Voltage Gain for Fuel Cell Systems

2014 ◽  
Vol 573 ◽  
pp. 83-88
Author(s):  
A. Marikkannan ◽  
B.V. Manikandan ◽  
S. Jeyanthi
Keyword(s):  
Fuel Cell ◽  
High Voltage ◽  
Output Voltage ◽  
System Analysis ◽  
Clean Energy ◽  
High Gain ◽  
Boost Converter ◽  
Voltage Gain ◽  
Zero Voltage Switching ◽  
High Voltage Gain

The interest toward the application of fuel cells is increasing in the last years mainly due to the possibility of highly efficient decentralized clean energy generation. The output voltage of fuel-cell stacks is generally below 50 V. Consequently, low-power applications with high output voltage require a high gain for proper operation. A zero-voltage-switching (ZVS) dc–dc converter with high voltage gain is proposed for fuel cell as a front-end converter. It consists of a ZVS boost converter stage and a ZVS half-bridge converter stage and two stages are merged into a single stage. The ZVS boost converter stage provides a continuous input current and ZVS operation of the power switches. The ZVS half-bridge converter stage provides a high voltage gain. The principle of operation and system analysis are presented. Theoretical analysis and simulation result of the proposed converter were verified.

scholarly journals High Voltage using DC-DC Switched Capacitor Converter for PV Application without Transformer

2019 ◽  
Vol 9 (2S4) ◽  
pp. 431-434
Keyword(s):  
High Voltage ◽  
Electromagnetic Interference ◽  
High Efficiency ◽  
Life Time ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
High Voltage Gain ◽  
Ac Power ◽  
Switched Capacitor Converter ◽  
Current Ripples

In this paper, a DC-DC switched capacitor (SC) converter without using transformer is designed to achieve high voltage gain. Normally a transformer is used for AC-AC power conversion with step up or step down operation without changing the frequency. But it occupies more space due to its size and weight. Therefore, switched capacitor is used for achieving high voltage combine with converter, in order to avoid the transformer due to more expensive and losses. The traditional converter consists of more switches and stresses as well as losses with converter. In proposed converter, it uses fewer amounts of switches and gives high efficiency to increase the voltage gain. The current ripples are filtered that help to device life time and also reduce the electromagnetic interference. The designed converter is analyzed and the voltage is attained using MATLAB/Simulink.

Isolated High Step-Up DC-DC Converter with Zero-Voltage-Switching

2013 ◽  
Vol 313-314 ◽  
pp. 333-336
Author(s):  
Hyun Lark Do
Keyword(s):  
Output Voltage ◽  
Voltage Gain ◽  
Leakage Inductance ◽  
Zero Voltage Switching ◽  
Voltage Doubler ◽  
Total Leakage ◽  
Zero Voltage ◽  
Recovery Problem ◽  
Switch Voltage ◽  
Voltage Switching

A high step-up DC-DCconverter is proposed in this paper. The proposed converter has two transformers.The primary sides of them are paralleled virtually and the secondary sides haveseries connection to increase the voltage gain. An active clamp circuit isemployed to suppress the switch voltage stresses and obtainzero-voltage-switching (ZVS) operation of the switches. Voltage doubler isselected as an output rectifier to increase the voltage gain and confine thevoltage across the output diodes to the output voltage. Since the output diodecurrents are controlled by the total leakage inductance of the transformers,the reverse-recovery problem of the output diodes is significantly alleviated.Due to the ZVS operation and the alleviated reverse-recovery problem, theswitching losses of the proposed converter are significantly reduced and theefficiency is improved. Steady-state analysis is performed. Experimentalresults based on a prototype are also provided to verify the effectiveness andfeasibility of the proposed converter.

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