Non‐isolated high step‐up DC–DC converter based on coupled inductors, diode‐capacitor networks, and voltage multiplier cells

2021 ◽  
Author(s):  
Antonio Alisson Alencar Freitas ◽  
Francilino Carneiro de Araújo ◽  
Francisco Aldinei Pereira Aragão ◽  
Kleber Cesar Alves de Souza ◽  
Fernando Lessa Tofoli ◽  
...  
Keyword(s):  
Voltage Multiplier ◽  
Coupled Inductors

scholarly journals A High Step-Up Interleaved DC-DC Converter With Voltage Multiplier and Coupled Inductors for Renewable Energy Systems

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 123165-123174 ◽  
Author(s):  
Mamdouh L. Alghaythi ◽  
Robert M. O'Connell ◽  
Naz E. Islam ◽  
Mohammed Masum Siraj Khan ◽  
Josep M. Guerrero
Keyword(s):  
Renewable Energy ◽  
Energy Systems ◽  
Renewable Energy Systems ◽  
Voltage Multiplier ◽  
Coupled Inductors

scholarly journals The Improvement Switching Technique for High Step-Up DC-DC Boost Converter

Electronics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 981
Author(s):  
Viet-Anh Truong ◽  
Xuan-Truong Luong ◽  
Phan-Thanh Nguyen ◽  
Thanh-Hai Quach
Keyword(s):  
Energy Conversion ◽  
Duty Cycle ◽  
Mathematical Analysis ◽  
Energy Conversion Efficiency ◽  
Control Area ◽  
Maximum Efficiency ◽  
Activity Levels ◽  
Constant Voltage ◽  
Voltage Multiplier ◽  
Coupled Inductors

This paper proposes the non-isolated DC-DC converter with high boost ratios and efficiency. We suggest boosting methods including voltage multiplier cells or coupled inductors. However, both techniques have a limited constant voltage multiplier coefficient according to the fixed configuration. Therefore, in the proposed method, we change the multiplier factor (as the number of activity levels) and combine it with the turn of the appropriate duty cycle; these factors are considered at the same time in order to increase the energy conversion efficiency and expand the control area of the duty cycle. A mathematical analysis of the losses of the components in operation modes shows that the boost ratio and efficiency are functions of the number of activity levels and duty cycle. Therefore, this paper proposes an algorithm for tracking the activity levels and duty cycle in order to obtain the maximum efficiency. The simulations produced with the Powersim-PSIM software, and the experiments with load capacities of 250 W, 500 W and 1000 W, boosting the ratio by more than ten times, were conducted in order to clarify the capabilities of the proposed configuration.

scholarly journals High-Gain High-Efficiency DC–DC Converter with Single-Core Parallel Operation Switched Inductors and Rectifier Voltage Multiplier Cell

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4634
Author(s):  
Eduardo Augusto Oliveira Barbosa ◽  
Márcio Rodrigo Santos de Carvalho ◽  
Leonardo Rodrigues Limongi ◽  
Marcelo Cabral Cavalcanti ◽  
Eduardo José Barbosa ◽  
...  
Keyword(s):  
High Voltage ◽  
Duty Cycle ◽  
High Efficiency ◽  
High Gain ◽  
Voltage Gain ◽  
Parallel Operation ◽  
Voltage Multiplier ◽  
Coupled Inductors ◽  
High Voltage Gain

This paper proposes a high step-up high-efficiency converter, comprised of an active switched coupled-inductor cell. The secondary windings are integrated into a rectifier voltage multiplier cell in a boost-flyback configuration, allowing the operation with high voltage gain with low switches duty cycle and low turn-ratios on the coupled-inductors. Both coupled-inductors are integrated into a single core due to the parallel operation of the switches. The leakage inductances of the coupled-inductors are used to mitigate the reverse recovery currents of the diodes, while regenerative clamp circuits are used to protect the switches from the voltage spikes caused by the leakage inductances. The operation of the converter is analyzed both quantitatively and qualitatively, and the achieved results are validated through experimentation of a 400 W prototype. A 97.1% CEC efficiency is also reported.

scholarly journals Interleaved High Step-Up DC–DC Converter with Voltage-Lift and Voltage-Stack Techniques for Photovoltaic Systems

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2537
Author(s):  
Shin-Ju Chen ◽  
Sung-Pei Yang ◽  
Chao-Ming Huang ◽  
Yu-Hua Chen
Keyword(s):  
Output Voltage ◽  
Low Voltage ◽  
Input Voltage ◽  
Photovoltaic Systems ◽  
Voltage Multiplier ◽  
Coupled Inductors ◽  
Power Switch ◽  
Power Switches ◽  
And Performance ◽  
High Output Voltage

A novel interleaved high step-up DC–DC converter applied for applications in photovoltaic systems is proposed in this paper. The proposed configuration is composed of three-winding coupled inductors, voltage multiplier cells and a clamp circuit. The step-up voltage gain is effectively increased, owing to the voltage-stack and voltage-lift techniques using the voltage multiplier cells. The leakage inductor energy is recycled by the clamp circuit to avoid the voltage surge on a power switch. The low-voltage-rated power switches with low on-state resistances and costs can be used to decrease the conduction losses and increase the conversion efficiency when the voltage stresses of power switches for the converter are considerably lower than the high output voltage. The reverse-recovery problems of diodes are mitigated by the leakage inductances of the coupled inductors. Moreover, both the input current ripple and the current stress on each power switch are reduced, owing to the interleaved operation. The operating principle and steady-state analysis of the proposed converter are thoroughly presented herein. A controller network is designed to diminish the effect of the variations of input voltage and output load on the output voltage. Finally, the experimental results for a 1 kW prototype with 28–380 V voltage conversion are shown to demonstrate its effectiveness and performance.

New topologies of high gain-step-up dc-dc power converters for renewable energy applications

2020 ◽  
Author(s):  
◽  
Mamdouh L. Alghaythi
Keyword(s):  
High Voltage ◽  
Closed Loop ◽  
Low Voltage ◽  
Open Loop ◽  
Loop System ◽  
Input Current ◽  
Voltage Gain ◽  
Voltage Multiplier ◽  
Coupled Inductors ◽  
Simulation Results

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] This dissertation proposes new topologies of high step-up dc-dc power electronic converters for integration renewable energy systems, such as photovoltaic panels (PV) from low voltage sources to high voltage dc buses in 480/900. The first topology presents a high step-up interleaved dc-dc converter with voltage multiplier cells and coupled inductors. The proposed converter achieves a very high step-up voltage gain due to the two coupled inductors and the voltage multiplier cell. This topology utilizes the interleaved boost converter in the input side, and the input current is shared with low ripple. Moreover, the voltage multiplier cell with the secondary windings of the coupled inductors is employed in the output side to achieve the interleaved energy storage. The voltage stress on the semiconductors switches and the passive components is significantly reduced and lower than the output voltage. The aforementioned converter can be operated without an extreme duty cycle or a high turns ratio. The operation principle of the proposed converter and the comparison between the proposed converter with other topologies are discussed. The parameters selection, and simulation results are thoroughly introduced. A 32 V to 800 V-dc is verified and simulated by using PLECS. The second topology introduces a new high voltage gain interleaved DC-DC Converter with diodes-capacitors technique and dual coupled inductors to lift a 30 V to 900 V. The input current ripple is reduced due to the interleaved dc-dc converter operation, the voltage loss on power semiconductor devices is mitigated. Furthermore, by implementing low-voltage-rated MOSFETs with a small ON-resistance, the conduction losses can be reduced, and the efficiency can be improved. The reverse recovery problem of the diodes is mitigated, and the leakage energy is recycled. The simulation results are explored. The other two proposed converters present a multiphase-interleaved boost high step-up dc-dc converter and a high voltage gain converter with an improved charge pump. Both the proposed converters offer a continuous input current, and they both operate in the continuous conduction mode. The voltage stress, the current stress and the losses on power devices are reduced with providing an ultra-voltage gain. The theoretical analysis of the aforementioned converters are analyzed with supporting simulation. The control techniques of high step-up dc-dc converters, which include the maximum power point tracking for PV applications, voltage mode control, PWM and the closed loop control response are provided. The control strategy for the dynamic performance of the aforementioned converter is presented thoroughly. The pulse width modulation (PWM) is generated by the digital signal processor (DSP) Texas Instrument TMS320F28234ZJZ. The method for designing a closed loop system includes choosing the type of control (voltage mode or current mode), generating a small signal model of the power converter, regulating the control to output transfer function of the open loop system, constructing the bode plots of the open loop system, designing voltage compensator transfer function with closed loop bode plots, and providing the simulation results.

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