scholarly journals Dual-Input Isolated DC-DC Converter with Ultra-High Step-Up Ability Based on Sheppard Taylor circuit

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1125 ◽  
Author(s):  
Shen ◽  
Chen ◽  
Chen
Keyword(s):  
Theoretical Analysis ◽  
Hardware Implementation ◽  
Lower Cost ◽  
Voltage Gain ◽  
Theoretical Derivation ◽  
Stage Design ◽  
Control Approach ◽  
Power Stage ◽  
Voltage Clamping ◽  
Switch Voltage

A dual-input high step-up isolated converter (DHSIC) is proposed in this paper, which incorporates Sheppard Taylor circuit into power stage design so as to step up voltage gain. In addition, the main circuit adopts boosting capacitors and switched capacitors, based on which the converter voltage gain can further be improved significantly. Since the proposed converter possesses an inherently ultra-high step-up feature, it is capable of processing low input voltages. The DHSIC also has the important features of leakage energy recycling, switch voltage clamping, and continuous input-current obtaining. These characteristics advantage converter efficiency and benefit the DHSIC for high power applications. The structure of the proposed converter is concise. That is, it can lower cost and simplifies control approach. The operation principle and theoretical derivation of the proposed converter are discussed thoroughly in this paper. Simulations and hardware implementation are carried out to verify the correctness of theoretical analysis and to validate feasibility of the converter as well.

High Step-Up Converter Series Based on the Diode-Capacitor Network

2015 ◽  
Vol 719-720 ◽  
pp. 603-610
Author(s):  
Qi Chen ◽  
Yu Qi Wu ◽  
Jia Lin Ma
Keyword(s):  
Theoretical Analysis ◽  
Conversion Efficiency ◽  
Simulation Analysis ◽  
Experimental Results ◽  
High Conversion ◽  
Voltage Gain ◽  
High Conversion Efficiency ◽  
Voltage Stress ◽  
In Series ◽  
Switch Voltage

This essay is about the application of a diode-capacitor network on conventional non-isolated DC–DC converter. The study will focus on obtaining high step-up voltage gain, low switch voltage stress, simple control, and high conversion efficiency. Three single-switch step-up converters with high step-up ratio based on the diode-capacitor network are proposed. The principle of operation and theoretical analysis of every single-switch step-up converter is evaluated for both continuous and discontinuous conduction modes. Given the mirror-symmetrical characteristic of the diode-capacitor network, cascade single-switch step-up converters based on the single-switch positive-output step-up converter are achieved when several diode-capacitor networks are arranged in series. Simulation analysis and experimental results obtained from the implemented prototypes operating at 40 kHz are provided to verify the performances of the proposed step-up converters.

scholarly journals Step-Up Series Resonant DC–DC Converter with Bidirectional-Switch-Based Boost Rectifier for Wide Input Voltage Range Photovoltaic Applications

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3747 ◽  
Author(s):  
Abualkasim Bakeer ◽  
Andrii Chub ◽  
Dmitri Vinnikov
Keyword(s):  
Theoretical Analysis ◽  
Duty Cycle ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Switching Frequency ◽  
Voltage Gain ◽  
Voltage Range ◽  
Dc Voltage ◽  
Wide Range ◽  
Series Resonant

This paper proposes a high gain DC–DC converter based on the series resonant converter (SRC) for photovoltaic (PV) applications. This study considers low power applications, where the resonant inductance is usually relatively small to reduce the cost of the converter realization, which results in low-quality factor values. On the other hand, these SRCs can be controlled at a fixed switching frequency. The proposed topology utilizes a bidirectional switch (AC switch) to regulate the input voltage in a wide range. This study shows that the existing topology with a bidirectional switch has a limited input voltage regulation range. To avoid this issue, the resonant tank is rearranged in the proposed converter to the resonance capacitor before the bidirectional switch. By this rearrangement, the dependence of the DC voltage gain on the duty cycle is changed, so the proposed converter requires a smaller duty cycle than that of the existing counterpart at the same gain. Theoretical analysis shows that the input voltage regulation range is extended to the region of high DC voltage gain values at the maximum input current. Contrary to the existing counterpart, the proposed converter can be realized with a wide range of the resonant inductance values without compromising the input voltage regulation range. Nevertheless, the proposed converter maintains advantages of the SRC, such as zero voltage switching (ZVS) turn-on of the primary-side semiconductor switches. In addition, the output-side diodes are turned off at zero current. The proposed converter is analyzed and compared with the existing counterpart theoretically and experimentally. A 300 W experimental prototype is used to validate the theoretical analysis of the proposed converter. The peak efficiency of the converter is 96.5%.

Comparative Study on Ultimate Pullout Resistance Test and Theoretical Derivation of Flexible Pressurized Anchor with Numerical Simulation Result

2012 ◽  
Vol 268-270 ◽  
pp. 753-760
Author(s):  
Xuan Li Zhang ◽  
Wen Bin Wei
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Theoretical Derivation ◽  
Material Body ◽  
Pullout Resistance ◽  
Test Study ◽  
Simulation Calculation ◽  
Calculation Process ◽  
Calculation Results ◽  
Pressure Stress

The study on anchorage characteristics of flexible pressurized anchor should be along with theoretical analysis, numerical simulation and test study. Through comparing three calculation results, it is concluded that the theoretical analysis and numerical simulation can authenticate the correctness of calculation process each other; After considering the situation that friction coefficient changed with different contact pressure stress, the deviation of calculation of theory derivation and numerical simulation with experimental results significantly reduced; Anchor was simplified for anisotropic composite material body, which should be able to better reduce deviation among test, theoretical derivation and numerical simulation calculation.

scholarly journals The Exponential Stabilization of a Class of n-D Chaotic Systems via the Exact Solution Method

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Runzi Luo ◽  
Jiaojiao Fu ◽  
Haipeng Su
Keyword(s):  
Numerical Simulation ◽  
Exact Solution ◽  
Theoretical Analysis ◽  
Chaotic System ◽  
Unknown Parameter ◽  
Chaotic Systems ◽  
Solution Method ◽  
Exponential Stabilization ◽  
Control Approach

This paper treats the exponential stabilization of a class of n-D chaotic systems. A new control approach which is called the exact solution method is presented. The most important feature of this method is that the solution of the system under consideration can be carefully designed to converge exponentially to the origin. Based on this method, the exponential stabilization of a class of n-D chaotic systems and its application in controlling chaotic system with unknown parameter are presented. The Genesio-Tesi system is taken to give the numerical simulation which is completely consistent with the theoretical analysis presented in this paper.

Application of Multidisciplinary Design Optimization to the Power Stage Design of a Power Converter

1993 ◽  
Author(s):  
Gregory Kott ◽  
Gary A. Gabriele ◽  
Jacob Korngold
Keyword(s):  
Design Optimization ◽  
Design Problem ◽  
Multidisciplinary Design Optimization ◽  
Power Converter ◽  
Multidisciplinary Design ◽  
Successful Implementation ◽  
Total System ◽  
Global Approximation ◽  
Stage Design ◽  
Power Stage

Abstract This paper describes the application of multidisciplinary design optimization to the power stage design of a power converter. The decomposition of the power stage design into an electrical and a loss subsystem is developed. The Sequential Global Approximation method is the non-hierarchic algorithm used to optimize the power stage design problem. Results of the non-hierarchic formulation compared to the non-decomposed formulation show a decrease of 63 percent in total system iterations required to converge to the optimal solution. Local and global move limits of 28 percent were found to provide the best performance for this problem. The successful implementation and results of applying multidisciplinary design optimization to power stage design allows the extension of the research to incorporate other disciplines. Our goal is to include all disciplines to completely model the design of a power converter. The details of power stage design problem formulation are provided to be used as a test problem in multidisciplinary design optimization research.

High Step-Up Boost-Fly-Back Converter with Soft Switching for Photovoltaic Applications

2018 ◽  
Vol 28 (01) ◽  
pp. 1950014
Author(s):  
Ghasem Haghshenas ◽  
Sayyed Mohammad Mehdi Mirtalaei ◽  
Hamed Mordmand ◽  
Ghazanfar Shahgholian
Keyword(s):  
Output Voltage ◽  
Input Voltage ◽  
Magnetic Core ◽  
Soft Switching ◽  
Voltage Gain ◽  
Pv System ◽  
Voltage Stress ◽  
Photovoltaic Applications ◽  
Output Capacitor ◽  
Switch Voltage

In this paper, a novel high step-up single switch DC–DC converter with soft switching is presented. The main application of this converter is the connection of photovoltaic (PV) system to a 400[Formula: see text]V DC-bus. The proposed converter achieves high step-up voltage gain with small duty cycle by a combined boost and fly-back topology. Also, its switch voltage stress is lower than the output voltage. Besides, in the proposed converter, any auxiliary switch or magnetic core has not been used — therefore, the number of converter components has not been increased much in comparison with the conventional boost-fly-back converter. The operation principles of the converter and its theoretical operation waveforms are presented. In order to evaluate the theoretical analysis, a prototype of the converter is designed and experimentally implemented. The practical results are presented for a 100[Formula: see text]W boost-fly-back converter with input voltage of 40[Formula: see text]V and output voltage of 400[Formula: see text]V. Also, the output capacitor is designed to have less than 1% ripple on output voltage.

A Voltage Multiplier Based High Voltage Gain Transformerless Buck–Boost DC–DC Converter

2018 ◽  
Vol 27 (12) ◽  
pp. 1850188 ◽  
Author(s):  
Hossein Ajdar Faeghi Bonab ◽  
Mohamad Reza Banaei ◽  
Navid Taghizadegan Kalantari
Keyword(s):  
High Voltage ◽  
Boost Converter ◽  
Voltage Gain ◽  
Power Switch ◽  
High Voltage Gain ◽  
Voltage Stress ◽  
Converter Topology ◽  
Mathematical Analyses ◽  
State Resistance ◽  
Switch Voltage

In this paper, a new transformerless buck–boost converter is introduced. The proposed converter voltage gain is higher that of the conventional buck–boost converter. In the presented converter, only one power switch is used. The switch voltage stress is low, therefore, the low on-state resistance of the power switch can be selected to decrease losses of the switch. The presented converter topology is simple, hence the control of the converter will be simple. The mathematical analyses and principle of the proposed converter are explained. The validity of the proposed converter is confirmed by the experimental results.

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