scholarly journals Noncascading Quadratic Buck-Boost Converter for Photovoltaic Applications

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 984
Author(s):  
Rodrigo Loera-Palomo ◽  
Jorge A. Morales-Saldaña ◽  
Michel Rivero ◽  
Carlos Álvarez-Macías ◽  
Cesar A. Hernández-Jacobo
Keyword(s):  
Boost Converter ◽  
Conversion Ratio ◽  
Operating Conditions ◽  
Duty Ratio ◽  
Switching Converters ◽  
Switching Converter ◽  
Photovoltaic Applications ◽  
Converter Topologies ◽  
Voltage Conversion ◽  
Different Sources

The development of switching converters to perform with the power processing of photovoltaic (PV) applications has been a topic receiving growing interest in recent years. This work presents a nonisolated buck-boost converter with a quadratic voltage conversion gain based on the I–IIA noncascading structure. The converter has a reduced component count and it is formed by a pair of L–C networks and two active switches, which are operated synchronously to achieve a wide conversion ratio and a quadratic dependence with the duty ratio. Additionally, the analysis using different sources and loads demonstrates the differences in the behavior of the converter, as well as the pertinence of including PV devices (current sources) into the analysis of new switching converter topologies for PV applications. In this work, the voltage conversion ratio, steady-state operating conditions and semiconductor stresses of the proposed converter are discussed in the context of PV applications. The operation of the converter in a PV scenario is verified by experimental results.

scholarly journals High Step-Up DC—DC Converter for AC Photovoltaic Module with MPPT Control

2014 ◽  
Vol 65 (4) ◽  
pp. 248-253 ◽  
Author(s):  
Govindasamy Sundar ◽  
Narashiman Karthick ◽  
Sasi Rama Reddy
Keyword(s):  
Output Voltage ◽  
High Gain ◽  
Boost Converter ◽  
Conversion Ratio ◽  
Duty Ratio ◽  
Photovoltaic Module ◽  
Prototype Model ◽  
Pv Panel ◽  
Measured Efficiency ◽  
Voltage Conversion

Abstract This paper presents the high gain step-up BOOST converter which is essential to step up the low output voltage from PV panel to the high voltage according to the requirement of the application. In this paper a high gain BOOST converter with coupled inductor technique is proposed with the MPPT control. Without extreme duty ratios and the numerous turns-ratios of a coupled inductor this converter achieves a high step-up voltage-conversion ratio and the leakage energy of the coupled inductor is efficiently recycled to the load. MPPT control used to extract the maximum power from PV panel by controlling the Duty ratio of the converter. The PV panel, BOOST converter and the MPPT are modeled using Sim Power System blocks in MATLAB/SIMULINK environment. The prototype model of the proposed converter has been implemented with the maximum measured efficiency is up to 95.4% and full-load efficiency is 93.1%.

An interleaved soft-switching converter with high voltage conversion ratio for fuel cells

2017 ◽  
Vol 104 (7) ◽  
pp. 1190-1213 ◽  
Author(s):  
Long-Yi Chang ◽  
Kuei-Hsiang Chao ◽  
Tsang-Chih Chang ◽  
Yang-Guang Liu ◽  
Liang-Chiao Huang
Keyword(s):  
Fuel Cells ◽  
High Voltage ◽  
Conversion Ratio ◽  
Soft Switching ◽  
Switching Converter ◽  
Voltage Conversion

scholarly journals A dual-switch cubic SEPIC converter with extra high voltage gain

2021 ◽  
Vol 12 (1) ◽  
pp. 199
Author(s):  
Christophe Raoul Fotso Mbobda ◽  
Alain Moise Dikandé
Keyword(s):  
High Voltage ◽  
Duty Cycle ◽  
Magnetic Coupling ◽  
Conversion Ratio ◽  
Duty Ratio ◽  
Voltage Gain ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Extra High Voltage ◽  
Voltage Conversion

To provide a high votage conversion ratio, conventional non-isolated DC-DC boost topologies, which have reduced voltage boost capability, have to operate with extremely high duty cycle ratio, higher than 0.9. This paper proposes a DC-DC converter which is mainly based on the narrow range of duty cycle ratio to achieve extra high voltage conversion gain at relatively reduced voltage stress on semiconductors. In addition, it does include any magnetic coupling structure. The structure of the proposed converter combines the new hybrid SEPIC converter and voltage multiplier cells. From the steady-state analysis, this converter has wide conversion ratio and cubic dependence with respect to the duty ratio and then, can increase the output voltage several times more than the conventional and quadratic converters at the same duty cycle ratio. However, the proposed dual-switch cubic SEPIC converter must withstand higher voltage stress on output switches. To overcome this drawback, an extension of the proposed converter is also introduced and discussed. The superiority of the proposed converter is mainly based on its cubic dependence on the duty cycle ratio that allows it to achieve extra high voltage gain at reduced voltage stress on semiconductors. Simulation results are shown and they corroborate the feasibility, practicality and validity of the concepts of the proposed converter.

Design and Analysis of a High-Efficiency Two-Phase Interleaved Boost Converter with Modified Conversion Ratio and Low Voltage Stress

2021 ◽  
pp. 2150161
Author(s):  
Mriganka Biswas ◽  
Somanath Majhi ◽  
Harshal Nemade
Keyword(s):  
High Efficiency ◽  
Low Voltage ◽  
Load Condition ◽  
Boost Converter ◽  
Conversion Ratio ◽  
Duty Ratio ◽  
Two Phase ◽  
Voltage Stress ◽  
Interleaved Boost Converter ◽  
In Series

The paper presents a two-phase interleaved boost converter (IBC) providing higher step-up conversion ratio compared to the conventional IBC. The circuit consists of a crossly connected diode-capacitor cell which provides the extra boost up. The two identical capacitors of the cell are charged in parallel and discharged in series providing high voltage gain at considerably low duty ratio. Switching operations, ripple and average currents through inductors are analyzed in continuous conduction mode (CCM). Ripple in input current is also improved. The voltage stress across the semiconductor devices is less in the proposed converter. Also, boundary load condition is derived. Small-signal modeling is carried out and a control circuit is enabled in the voltage mode control framework. Power losses are analyzed and 96.53[Formula: see text] efficiency is achieved. Finally, the proposed converter is designed and implemented, and experimental results are provided.

scholarly journals Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3924
Author(s):  
Daniele Scirè ◽  
Gianpaolo Vitale ◽  
Marco Ventimiglia ◽  
Giuseppe Lullo
Keyword(s):  
Power Density ◽  
Virtual Instrument ◽  
Magnetic Core ◽  
Operating Conditions ◽  
Switching Converters ◽  
Saturation Current ◽  
Linear Region ◽  
Switching Converter ◽  
Power Inductors

The exploitation of power inductors outside their linear region in switching converters can be achieved by raising the current until a decrease in the inductance can be noticed. This allows using a smaller magnetic core, increasing the power density of the converter. On the other hand, a detailed description of the magnetization curve including the temperature is required. Since this information is often not included in the inductor’s datasheets, this paper shows how to identify the behavior of an inductor when it is operated up to saturation and its temperature rises. In order to characterize the inductor in real operating conditions, a dedicated measurement rig was developed. It consists of a switching converter that encompasses the inductor under test and is controlled by a virtual instrument developed in LabVIEW. The characterization system was tested by retrieving the inductance and the magnetization curves vs. current for two commercial inductors at core temperatures up to 105 °C. The magnetic core was then characterized by the saturation current vs. inductance, obtaining an expression for the whole family of inductors sharing the same core. Finally, we experimentally analyzed the thermal transient of the inductors in operating conditions, confirming the fundamental role of the temperature in changing the current profiles and the core saturation condition.

scholarly journals Non-Linear Inductors Characterization in Real Operating Conditions for Power Density Optimization in SMPS

2021 ◽  
Author(s):  
Daniele Scirè ◽  
Marco Ventimiglia ◽  
giuseppe lullo ◽  
gianpaolo vitale
Keyword(s):  
Power Density ◽  
Virtual Instrument ◽  
Magnetic Core ◽  
Operating Conditions ◽  
Switching Converters ◽  
Saturation Current ◽  
Linear Region ◽  
Switching Converter ◽  
Power Inductors

The exploitation of power inductors outside their linear region in switching converters can be achieved by raising the current until a decreasing of the inductance can be noticed. It allows using a smaller magnetic core increasing the power density of the converter. On the other hand, a detailed description of the magnetization curve including the temperature is required. Since this information is often not included in the inductor’s datasheets, this paper shows how to identify the behavior of an inductor when it is operated up to saturation and its temperature rises. In order to characterize the inductor in real operating conditions, a dedicated measurement rig has been developed. It consists of a switching converter that encompasses the inductor under test and is controlled by a virtual instrument developed in LabVIEW. The characterization system was tested by retrieving the inductance and the magnetization curves vs. current for two commercial inductors at core tem-peratures up to 105°C. The magnetic core is then characterized by the saturation current versus inductance, obtaining an expression for the whole family of inductor sharing the same core. Finally, we analyzed experimentally the thermal transient of the inductors in operating conditions con-firming the fundamental role of temperature in changing the current profiles and the core saturation condition.

scholarly journals Voltage Clamped Tapped-Inductor Boost Converter with High Voltage Conversion Ratio

2012 ◽  
Vol 17 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Jung-Min Kang ◽  
Sang-Hyun Lee ◽  
Sung-Soo Hong ◽  
Sang-Kyoo Han
Keyword(s):  
High Voltage ◽  
Boost Converter ◽  
Conversion Ratio ◽  
Voltage Conversion

scholarly journals High-performance photonic transformers for DC voltage conversion

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Bo Zhao ◽  
Sid Assawaworrarit ◽  
Parthiban Santhanam ◽  
Meir Orenstein ◽  
Shanhui Fan
Keyword(s):  
High Performance ◽  
Electromagnetic Compatibility ◽  
High Efficiency ◽  
Light Emission ◽  
Detailed Balance ◽  
Integrated Design ◽  
Conversion Ratio ◽  
Switching Converters ◽  
Dc Voltage ◽  
Voltage Conversion

AbstractDirect current (DC) converters play an essential role in electronic circuits. Conventional high-efficiency DC voltage converters, especially step-up type, rely on switching operation, where energy is periodically stored within and released from inductors and/or capacitors connected in a variety of circuit topologies. Since these energy storage components, especially inductors, are fundamentally difficult to scale down, miniaturization of switching converters proves challenging. Furthermore, the resulting switching currents produce significant electromagnetic noise. To overcome the limitations of switching converters, photonic transformers, where voltage conversion is achieved through light emission and detection processes, have been demonstrated. However, the demonstrated efficiency is significantly below that of the switching converter. Here we perform a detailed balance analysis and show that with a monolithically integrated design that enables efficient photon transport, the photonic transformer can operate with a near-unity conversion efficiency and high voltage conversion ratio. We validate the theory with a transformer constructed with off-the-shelf discrete components. Our experiment showcases near noiseless operation and a voltage conversion ratio that is significantly higher than obtained in previous photonic transformers. Our findings point to the possibility of a high-performance optical solution to miniaturizing DC power converters and improving the electromagnetic compatibility and quality of electrical power.

scholarly journals Temperature Impact on Non-Linear Inductors in Operating Conditions for SMPS

2021 ◽  
Author(s):  
Daniele Scirè ◽  
Marco Ventimiglia ◽  
giuseppe lullo ◽  
gianpaolo vitale
Keyword(s):  
Virtual Instrument ◽  
Magnetic Core ◽  
Operating Conditions ◽  
Switching Converters ◽  
Saturation Current ◽  
Linear Region ◽  
Switching Converter ◽  
Temperature Impact ◽  
Power Inductors

The exploitation of power inductors outside their linear region in switching converters requires a detailed description of the magnetization curve that is often not included in the datasheets; besides, the temperature of the inductor must be taken into account. This paper shows how to characterize the behavior of an inductor when it is operated up to saturation and its temperature rises. In order to characterize the inductor in real operating conditions, a dedicated measurement rig has been developed. It consists of a switching converter that includes the inductor under test and is controlled by a virtual instrument developed in LabVIEW. The characterization system was tested by retrieving the inductance and the magnetization curves vs. current for two commercial inductors at core temperatures up to 105°C. The magnetic core is then characterized by the saturation current versus inductance, obtaining an expression for the whole family of inductor sharing the same core. Finally, we analyzed experimentally the thermal transient of the inductors in operating conditions confirming the fundamental role of temperature in changing the current profiles and the core saturation condition.

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