scholarly journals Novel High-Efficiency High Step-Up DC–DC Converter with Soft Switching and Low Component Voltage Stress for Photovoltaic System

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1112
Author(s):  
Yu-En Wu ◽  
Jyun-Wei Wang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Voltage ◽  
Leakage Inductance ◽  
Power Switch ◽  
Half Wave Voltage ◽  
Half Wave ◽  
Voltage Stress ◽  
Voltage Doubler

This study developed a novel, high-efficiency, high step-up DC–DC converter for photovoltaic (PV) systems. The converter can step-up the low output voltage of PV modules to the voltage level of the inverter and is used to feed into the grid. The converter can achieve a high step-up voltage through its architecture consisting of a three-winding coupled inductor common iron core on the low-voltage side and a half-wave voltage doubler circuit on the high-voltage side. The leakage inductance energy generated by the coupling inductor during the conversion process can be recovered by the capacitor on the low-voltage side to reduce the voltage surge on the power switch, which gives the power switch of the circuit a soft-switching effect. In addition, the half-wave voltage doubler circuit on the high-voltage side can recover the leakage inductance energy of the tertiary side and increase the output voltage. The advantages of the circuit are low loss, high efficiency, high conversion ratio, and low component voltage stress. Finally, a 500-W high step-up converter was experimentally tested to verify the feasibility and practicability of the proposed architecture. The results revealed that the highest efficiency of the circuit is 98%.

Neoteric Hybrid Multilevel Cascade Inverter Based on Low Switch Numbers Along with Low Voltage Stress: Design, Analysis, Verification

2017 ◽  
Vol 8 (1) ◽  
pp. 92
Author(s):  
Rasool Esmailzadeh ◽  
A. Ajami ◽  
M.R. Banaei
Keyword(s):  
Power Systems ◽  
Output Voltage ◽  
High Performance ◽  
High Efficiency ◽  
Low Voltage ◽  
Maximum Output ◽  
Dc Voltage ◽  
Multilevel Inverters ◽  
Voltage Stress ◽  
Multi Level

Abstract: With the purpose of rein in the high voltage of flexible power systems, renovation and amendment of multi-level structures aimed at acquisition of high quality voltage is certainly required. In this regard, robust topology must be occupied that encompass the maximum output voltage levels along with minimum of switch number, of course, with taking into account of Peak Inverse Voltage (PIV). In this paper, a neoteric high-performance multilevel cascaded inverter is suggested up to the problem of repetitive output levels to be unraveled and also number of output voltage levels to be maximized. It has been constructed by series-connected multilevel inverters blocks and three-level inverter. The simulation results along with experimental results extracted by manufactured prototype have transparently approved high efficiency of proposed inverter as well as its feasibility. Apart from above, new mathematical approach has been presented to calculate and define the DC voltage sources magnitudes in asymmetric converter.

scholarly journals Single-switch high-efficiency hybrid boost–Ćuk DC/DC converter with high-voltage gain and low-voltage stress

2020 ◽  
Vol 13 (12) ◽  
pp. 2538-2546
Author(s):  
António Manuel Santos Spencer Andrade ◽  
Tiago Miguel Klein Faistel ◽  
Ronaldo Antonio Guisso
Keyword(s):  
High Voltage ◽  
High Efficiency ◽  
Low Voltage ◽  
Voltage Gain ◽  
High Voltage Gain ◽  
Voltage Stress

scholarly journals High Gain DC-DC Converter Integrating Dickson Charge Pump with Coupled Inductor Technique

2021 ◽  
Vol 7 (6) ◽  
pp. 272-277
Author(s):  
P. Nithin and Dr. R. Rajeswari
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
High Gain ◽  
Voltage Gain ◽  
Power Switch ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Input Side ◽  
State Resistance ◽  
Current Ripple

In this paper, a novel high voltage gain DC-DC converter based on coupled inductor and voltage multiplier technique is proposed. The benefits of the proposed converter are ultra-high voltage gain, low voltage stress across the power switch and very low input current ripple by employing a low current ripple structure (LCR) at the input side. A low on state resistance (RDS(on)) of the power switch can be employed since the voltage stress is a maximum of 25% of the output voltage and the conduction losses of the switch is also reduced. Design of a 1.9kW, 48V at the low voltage side and 430V at the high voltage side is done and verified by simulation. Simulation results show an efficiency of over 93% when operating in continuous conduction mode (CCM).

scholarly journals A Comparative Study of Symmetrical Cockcroft-Walton Voltage Multipliers

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Mohsen Ruzbehani
Keyword(s):  
Comparative Study ◽  
High Voltage ◽  
High Efficiency ◽  
Low Voltage ◽  
Voltage Level ◽  
Voltage Multiplier ◽  
Voltage Ratio ◽  
Voltage Stress ◽  
Cost Of Construction

Decades after invention of the Cockcroft-Walton voltage multiplier, it is still being used in broad range of high voltage and ac to dc applications. High voltage ratio, low voltage stress on components, compactness, and high efficiency are its main features. Due to the problems of original circuit, reduction of output ripple and increase of accessible voltage level were the motivations for scientist to propose new topologies. In this article a comparative study on these voltage multipliers was presented. By simulations and experimental prototypes, characteristics of the topologies have been compared. In addition to the performances, components count, voltage stress on the components, and the difficulty and cost of construction are other factors which have been considered in this comparison. An easy to use table which summarized the characteristics of VMs was developed, which can be used as a decision mean for selecting of a topology based on the requirements. It is shown that, due to the application, sometimes a simple and not very famous topology is more effective than a famous one.

scholarly journals High Voltage, Low Current High-Power Multichannel LEDs LLC Driver by Stacking Single-Ended Rectifiers with Balancing Capacitors

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 529
Author(s):  
Kang Hyun Yi
Keyword(s):  
High Voltage ◽  
High Power ◽  
Low Voltage ◽  
Driving Voltage ◽  
Led Driver ◽  
Leakage Inductance ◽  
Voltage Stress ◽  
Driver Circuit ◽  
In Series ◽  
The Difference

In this paper, a new LLC converter for series-connected, high-voltage LEDs is proposed. The proposed LLC converter consists of two stacked, single-ended rectifiers and one balancing capacitor, to compensate for the current deviation of two individual LED strings. The proposed LLC LED driver can use a diode with low voltage stress, even if the secondary LED is connected in series to have a high driving voltage. In addition, even if several series-connected LEDs are changed into two-stacked structures, the balancing capacitor can compensate for the current deviation of the two separated LEDs, as well as the difference in leakage inductance of the two stacked single-ended rectifiers. The balancing capacitor can be made equal to the voltage tolerance of the stacked, single-ended rectifier diodes. The proposed circuit can be easily extended to a series channel LED driver circuit, without increasing the voltage stress. To verify the characteristics and operation of the proposed LLC LED driver, a 260W high-power LED driver is implemented.

Application of Dual Switch Flyback Converter in Three-Phase Photovoltaic Inverter

2014 ◽  
Vol 986-987 ◽  
pp. 1759-1762
Author(s):  
Chun Yang Yi ◽  
Tian Fa Liao ◽  
Qian Jin Ma ◽  
Chang Wen Dong ◽  
Jia Xiang Xue
Keyword(s):  
High Voltage ◽  
Input Voltage ◽  
Leakage Inductance ◽  
Flyback Converter ◽  
Pv Inverter ◽  
Power Switch ◽  
Auxiliary Power ◽  
Snubber Circuit ◽  
Three Phase ◽  
Voltage Stress

Auxiliary power of Three-phase photovoltaic inverter is supplied by solar cells with wide input ranging from 140V to 1000V.The conventional single-switch flyback converter exists too high voltage stress in power switch to be applied in this inverter. This paper presents a dual-switch flyback converter in which the voltage stress of each switch is slightly higher than the input voltage when switches turn off, at the same time , the leakage inductance energy is recycled back into the inputside; otherwise, this topology needs no snubber circuit, so it is much more efficient than single switch flyback. The dual switch flyback converter with seven outputs is successfully applied in 10KW three phase PV inverter.

scholarly journals Novel Step-up DC-to-DC Converter with Isolated Transformer and Switched-Clamp Capacitor Techniques for Renewable Systems

2016 ◽  
Author(s):  
Yong-Seng Wong ◽  
Jiann-Fuh Chen ◽  
Kuo-Bin Liu
Keyword(s):  
Steady State ◽  
High Voltage ◽  
Output Voltage ◽  
Input Voltage ◽  
Power Converter ◽  
Maximum Efficiency ◽  
Voltage Gain ◽  
Power Switch ◽  
High Voltage Gain ◽  
Voltage Stress

A high step-up DC-to-DC converter that integrates an isolated transformer and a switched-clamp capacitor is presented in this study. The voltage stress of the main power switch should be clamped to 1/4 V by using the turn ratio and switched-clamp capacitor of an isolated transformer to achieve a high voltage gain. In addition, a passive clamp circuit is employed reduce voltage stress on the main power switch. The energy of the leakage inductor can be recycled by the clamp capacitor because of the passive clamp circuit, thereby improving the power converter efficiency. The converter consists of one isolated transformer, one main switch, three capacitors, and four diodes. Operating principle and steady-state analyses are also discussed. Finally, a 24-V-input voltage to 200-V-output voltage and a 150 W output power prototype converter are fabricated in the laboratory. The maximum efficiency of the converter is 95.1 at 60 W.

scholarly journals Design of a High Step-Up DC-DC Converter with Voltage Doubler and Tripler Circuits for Photovoltaic Systems

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Muhammad Yaseen ◽  
Ajmal Farooq ◽  
Muhammad Zeeshan Malik ◽  
Muhammad Usman ◽  
Ghulam Hafeez ◽  
...  
Keyword(s):  
High Voltage ◽  
Duty Cycle ◽  
Low Voltage ◽  
Input Voltage ◽  
Boost Converter ◽  
Design Parameters ◽  
Photovoltaic Module ◽  
Voltage Stress ◽  
Voltage Doubler ◽  
Interleaved Boost Converter

In this paper, a high step-up DC-DC interleaved boost converter is proposed for renewable sources with low voltages such as photovoltaic module and fuel cell. The proposed converter uses interleaving method with an additional voltage doubler and tripler circuit. In the proposed converter, the inductor at all phases is operated to gain high voltage through voltage doubler and tripler circuit capacitors with suitable duty cycle. The proposed topology operates in six switching states in one period. The steady-state analysis and operating principle are examined comprehensively which shows numerous improvements over the traditional boost converter. These improvements are high-voltage gain and low-voltage stress across switches. The proposed DC-DC interleaved boost converter has a gain/conversion ratio four times that of the conventional interleaved boost converter and four times less-voltage stress across the main switches. Simulation has been done in Matlab Simulink on a 70% duty cycle, and results are compared with conventional interleaved boost converter. For an input voltage of 15 volts, the proposed converter is able to generate an output voltage of 200 volts at 70% duty cycle with a voltage stress of 50 volts across main switches, whereas traditional interleaved boost converter generates 200 volts from same input voltage at 92.5% duty cycle with voltage stress of 200 volts across switches. From simulation results, it is clear that the proposed converter has better performance as compared to conventional interleaved boost converter for same design parameters.

A High-Voltage ZVZCS DC--DC Converter With Low Voltage Stress

2008 ◽  
Vol 23 (6) ◽  
pp. 2630-2647 ◽  
Author(s):  
Ting-Ting Song ◽  
Huai Wang ◽  
H.S.-H. Chung ◽  
S. Tapuhi ◽  
A. Ioinovici
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
Voltage Stress

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.

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