Power Electronic
S. Hasanzadeh; S.M. Dehghan; M. Asadi; S.M. Salehi
Abstract
Step-up DC-DC converters are essential components used in a wide range of applications. Many researchers have proposed various methods to achieve high voltage gain in DC-DC converters. However, this typically involves adding multiple passive components, which increases system complexity and complicates ...
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Step-up DC-DC converters are essential components used in a wide range of applications. Many researchers have proposed various methods to achieve high voltage gain in DC-DC converters. However, this typically involves adding multiple passive components, which increases system complexity and complicates output voltage control. Maintaining a constant output voltage at the desired value is critical in these converters despite the load, supply voltage changes, and circuit disturbance. Recently, a snubber-less high-step-up enhanced super-lift converter has been developed as a possible solution to these issues. This converter offers high gain without high voltage stress or snubber losses. A model of the converter was created using the state-space averaging technique and is presented in this paper. The control strategy proposed uses the input current in the inner loop and the output voltage in the outer loop. The paper also includes simulation and experimental results that validate the circuit analysis equations.
Power Electronic
N. Bagheri; B. Tousi; S.M. Alilou
Abstract
This research offers a high step-up DC-DC converter using a two- winding coupled inductor and voltage multiplier circuit (VMC) including diodes and capacitors for renewable energy (RE) usages such as photovoltaic (PV) and fuel cell (FC). The advantages of this converter are: 1) High voltage gain with ...
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This research offers a high step-up DC-DC converter using a two- winding coupled inductor and voltage multiplier circuit (VMC) including diodes and capacitors for renewable energy (RE) usages such as photovoltaic (PV) and fuel cell (FC). The advantages of this converter are: 1) High voltage gain with small duty cycle of the switch, 2) low voltage stress across switch/diodes, 3) Low number of components, 4) Lower volume and cost, 5) simple structure with only one power switch, 6) small current ripple of the input, 7) zero voltage and current (ZVS and ZCS) of the diodes, 8) improved efficiency, and 9) common grounding of the input and output. Due to the coupled inductor usage, the voltage gain is more flexible, and it can be enhanced by adjusting two different parameters: the turns ratio (N) of the coupled inductor and the duty cycle (D) of the switch. Furthermore, the voltage stresses of the semiconductors are decreased by increasing N. VMC is the other element for the power switch’s voltage stress reduction. The suggested topology could be an appropriate option for RE usage because of the small current ripple of the input and modified efficiency.
Power Electronic
H. Shayeghi; R. Mohajery; N. Bizon
Abstract
This research introduces a modified design for non-isolated DC-DC converters with a high voltage gain using the design concepts of a coupled inductor (CI) and a hybrid voltage multiplier cell. It is attainable to further increase the output gain without requiring a higher duty cycle or a large turn ratio ...
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This research introduces a modified design for non-isolated DC-DC converters with a high voltage gain using the design concepts of a coupled inductor (CI) and a hybrid voltage multiplier cell. It is attainable to further increase the output gain without requiring a higher duty cycle or a large turn ratio of CI. This means that the power switch won't be under too much voltage stress. The suggested converter's important features are low maximum voltage across all semiconductor components, considerable efficiency, and a substantial voltage conversion ratio. In addition, the suggested topology includes diodes with soft switching conditions, which allows for a reduction in reverse recovery losses and an improvement in system efficiency. The proposed topology includes input current continuity, a single power switch, and a common ground between the source and the load. Operating analysis, theoretical definitions, efficiency investigation, and a literature review of comparable structures have been considered to demonstrate the proposed structure's functionality. An experimental prototype has also been established, featuring 115V output voltage, 20V input voltage, and 40kHz switching frequency, to facilitate the assessment of the proposed converter's efficacy.
H. Shayeghi; S. Pourjafar; S.M. Hashemzadeh; F. Sedaghati
Abstract
In this article, a novel topology of DC-DC converter based on voltage multiplier cell and coupled inductor with higher efficiency and low blocking voltage across semiconductor is proposed for renewable energy application. The recommended topology obtains a high voltage gain using voltage multiplier cell ...
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In this article, a novel topology of DC-DC converter based on voltage multiplier cell and coupled inductor with higher efficiency and low blocking voltage across semiconductor is proposed for renewable energy application. The recommended topology obtains a high voltage gain using voltage multiplier cell and one coupled inductor. Only one power switch is utilized in this structure, which reduces the converter's cost. The other benefits of this converter are low number of components, high efficiency due to the zero-voltage switching and the zero-current switching of diodes, and low blocking voltage of the power switch and diodes. Besides, the voltage multiplier cell acts as a passive clamp circuit and reduces the voltage stress across the power switch. Thus, a low rated power switch can be used in the presented topology. Due to the zero-current switching in Off-state, the reverse recovery problem of diodes is reduced. To illustrate the performance and superiority of the presented topology, operation modes, steady-state and efficiency analysis, and the comparison study with other similar converters are presented. Finally, a 160~W experimental prototype with 50~kHz switching frequency and 17 V input voltage are built to confirm the theoretical investigation and effectiveness of the proposed converter.
