scholarly journals Transformerless High Step-Up DC-DC Converters with Switched-Capacitor Network

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1420 ◽  
Author(s):  
Truong-Duy Duong ◽  
Minh-Khai Nguyen ◽  
Tan-Tai Tran ◽  
Young-Cheol Lim ◽  
Joon-Ho Choi
Keyword(s):  
High Voltage ◽  
Controller Design ◽  
Low Voltage ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
Power Devices ◽  
Renewable Source ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Power Switches

High-voltage gain conversion is necessary for several applications, especially for low voltage renewable source applications. In order to achieve a high-voltage gain, the presented paper proposes a class of transformerless DC-DC converters based on three switched-capacitor networks. The proposed converters have the following characteristics: reduced voltage stress on the capacitors and power devices; obtained high voltage gain with small duty cycle; and reduced conduction losses in the power switches. To verify the operation principle of the proposed converters, the detailed analysis in different conditions of the proposed converters and a comparison considering existing topologies are also discussed in the paper. Moreover, the parameter selection and controller design for the converters are determined. Finally, to reconfirm the theoretical analysis, both the simulation and experimental results taken from a 400 W prototype operating at 60 kHz are given.

scholarly journals High Step-up Coupled Inductor Inverters Based on qSBIs

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 3032 ◽  
Author(s):  
Hongchen Liu ◽  
Xi Su ◽  
Junxiong Wang
Keyword(s):  
Steady State ◽  
High Voltage ◽  
Low Voltage ◽  
Duty Ratio ◽  
Voltage Gain ◽  
Passive Components ◽  
Steady State Analysis ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Working Principle

In this paper, two types of high step-up coupled inductor inverters based on qSBIs (quasi- switched boost inverters) are proposed. By applying the coupled inductor to the qSBIs, the voltage gain of the proposed inverter is regulated by turn ratio and duty ratio. Thus, a high voltage gain can be achieved without the circuits operating at the extreme duty cycle by choosing a suitable turn ratio of the coupled inductor. In addition, the proposed circuits have the characteristics of continuous input current and low voltage stress across the passive components. A boost unit can be added to the proposed inverters for further improvement of the voltage gain. In this paper, the working principle, steady state analysis, and the comparisons of the proposed inverter with other impedance-source inverters are described. A 200 W prototype was created and the experimental results confirm the correctness of the analysis in this paper.

A Novel Nonisolated Ultra-High-Voltage-Gain DC–DC Converter With Low Voltage Stress

2017 ◽  
Vol 64 (4) ◽  
pp. 2809-2819 ◽  
Author(s):  
Yong Cao ◽  
Vahid Samavatian ◽  
Kaveh Kaskani ◽  
Hamidreza Eshraghi
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
Voltage Gain ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Ultra High Voltage

An Embedded Half-Bridge Γ-Z-Source Inverter with Reduced Voltage Stress on Capacitors

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6433
Author(s):  
Hamed Mashinchi Maheri ◽  
Dmitri Vinnikov ◽  
Mohsen Hasan Babayi Nozadian ◽  
Elias Shokati Asl ◽  
Ebrahim Babaei ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Loss ◽  
Low Voltage ◽  
Voltage Gain ◽  
Correct Operation ◽  
Operating Modes ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Boost Factor ◽  
Zero Voltage

In this paper, an embedded half-bridge Z-source inverter based on gamma structure is proposed. In contrast with the classical half-bridge inverter, the proposed inverter can generate zero voltage levels in output. High voltage gain and low voltage stress on capacitors are the main advantages of the proposed converter. The value of the boost factor in the proposed structure is increased by changing both the shoot-through (ST) duty cycle and turns ratio of the transformer. The operating principle of the proposed converter in four operating modes is presented. We also calculate the critical inductance and compare the proposed converter with conventional topologies. In addition, power loss and THD analysis are presented. Finally, PSCAD/EMTDC software is used to verify the correct operation of the proposed inverter and the experimental results.

Non-Isolated High Step Up in Voltage DC–DC Converter Topology for Renewable Applications

2020 ◽  
pp. 2150093
Author(s):  
Pavan Prakash Gupta ◽  
G. Indira Kishore ◽  
Ramesh Kumar Tripathi
Keyword(s):  
High Voltage ◽  
Switching Frequency ◽  
Resistive Load ◽  
Voltage Gain ◽  
Boost Converters ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Power Switches ◽  
Converter Topologies ◽  
Converter Topology

In the class of the boost converters, the conventional DC–DC boost converters are in common practice but their limited boost capabilities at higher duty ratios are one of the concerns. The isolated and non-isolated step-up DC–DC converters are one of the remedies of the above issue. The presence of switched inductor and switched capacitors in the circuit of non-isolated configuration can provide considerable step-up in voltage at the output, and also facilitate lower voltage stress on components. In this paper, work has been done to propose three non-isolated high-voltage gain DC–DC boost converter topologies. Along with the high voltage gain, the topologies also have lesser voltage stress across the active power switches and diodes used in topologies. The proposed topologies are suitable for low dc input levels like renewable sources, microgrid and grid-connected applications. A Matlab/Simulink 2017a environment is utilized to derive, design and simulate the proposed topologies for a 100-W load operation. The basic topology is also realized in hardware as a prototype circuit with 100-W resistive load, operated at 50[Formula: see text]kHz switching frequency.

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