Buck converter

About: Buck converter is a research topic. Over the lifetime, 22530 publications have been published within this topic receiving 313580 citations. The topic is also known as: Buck Chopper & step-down converter.

A New Multilevel Converter Topology With Reduced Number of Power Electronic Components

Abstract: In this paper, a new topology for cascaded multilevel converter based on submultilevel converter units and full-bridge converters is proposed. The proposed topology significantly reduces the number of dc voltage sources, switches, IGBTs, and power diodes as the number of output voltage levels increases. Also, an algorithm to determine dc voltage sources magnitudes is proposed. To synthesize maximum levels at the output voltage, the proposed topology is optimized for various objectives, such as the minimization of the number of switches, gate driver circuits and capacitors, and blocking voltage on switches. The analytical analyses of the power losses of the proposed converter are also presented. The operation and performance of the proposed multilevel converter have been evaluated with the experimental results of a single-phase 125-level prototype converter.

Novel high-efficiency step-up converter

Abstract: As a result of the equivalent series resistor of the boost inductor, conventional boost converters are not able to provide high voltage gain. A high-efficiency high step-up converter is proposed, with low voltage stress on power switch, power diodes and output capacitors. The circuit topology of the proposed converter consists of an energy clamp circuit and a voltage boost cell. The boost converter functions as an active clamp circuit to suppress the voltage spike on power switch during the turn-off transient period. The boost converter output terminal and flyback converter output terminal are serially connected to increase the output voltage gain with the coupled inductor. By serially connecting the secondary windings of the boost inductor, a high voltage gain is achieved with less voltage stress on the power devices, such as power MOSFET and power diodes. The operational principle and steady-state analysis are described. A 35 W converter with simulation and experimental results is presented to demonstrate the performance. It shows that the efficiency of the proposed converter is very high (nearly 93%) with four times the voltage output.

Nonlinear phenomena in power electronics : attractors, bifurcations, chaos, and nonlinear control

Abstract: Preface. Acknowledgments. List of Contributing Authors. CHAPTER 1: INTRODUCTION (D. C. Hamill, S. Banerjee, and G. C. Verghese). 1.1 Introduction to Power Electronics. 1.2 An Example: The Buck DC/DC Converter 5 1.3 Study of Nonlinear Dynamics and Chaos in Power Electronics 15 1.4 Conclusions 20 CHAPTER 2: DYNAMIC MODELS OF POWER CONVERTERS. 2.1 Introduction to Power Electronic Converters and Models (G. C. Verghese and A. M. Stankovic). 2.2 A Closer Look at Sampled--Data Models for Power Converters (F. Vasca, M. di Bernardo, and G. Olivar). CHAPTER 3: BASICS OF BIFURCATION AND CHAOS THEORY. 3.1 Introduction to Nonlinear Dynamics and Chaos (S. Banerjee). 3.2 Bifurcations of Smooth Maps J. H. B. Deane). 3.3 Bifurcations in Piecewise--Smooth Maps (S. Banerjee and C. Grebogi). 3.4 Nonstandard Bifurcations in Discontinuous Maps (/. Dobson and S. Banerjee). 3.5 The Method of Schwarzian Derivatives (C. K. Tse). 3.6 Coexisting Attractors, Basins of Attraction, and Crises (E. Fossas and G. Olivar). CHAPTER 4: EXPERIMENTAL AND COMPUTATIONAL TECHNIQUES FOR INVESTIGATION OF NONLINEAR PHENOMENA. 4.1 Techniques of Experimental Investigation (C K. Tse). 4.2 Techniques of Numerical Investigation (S. Banerjee and D. C. Hamill). 4.3 Computation of Averages Under Chaos (J. L Rodriguez Marrero, G. C. Verghese, R. Santos Bueno, and S. H. Isabelle). 4.4 Calculation of Spectral Peaks in a Chaotic DC/DC Converter (J. H. B. Deane). 4.5 Computer Methods to Analyze Stability and Bifurcation Phenomena (Y. Kuroe). 4.6 Computation of Operating--Mode Boundaries (Y. Kuroe, T. Kato, and G. C. Verghese). CHAPTER 5: NONLINEAR PHENOMENA IN DC/DC CONVERTERS. 5.1 Border Collision Bifurcations in the Current--Mode--Controlled Boost Converter (S. Banerjee and P. Ranjan). 5.2 Bifurcation and Chaos in the Voltage--Controlled Buck Converter with Latch (S. Banerjee, D. Kastha, and S. Das). 5.3 Routes to Chaos in the Voltage--Controlled Buck Converter without Latch (M. di Bernardo, G. Olivar, and F. Vasca). 5.4 Saddle--Node and Neimark Bifurcations in PWM DC/DC Converters (C. C. Fang and E. H. Abed). 5.5 Nonlinear Analysis of Operation in Discontinuous--Conduction Mode (C. K. Tse). 5.6 Nonlinear Phenomena in the Cuk Converter (C. K. Tse). CHAPTER 6: NONLINEAR DYNAMICS IN THYRISTOR AND DIODE CIRCUITS (/. Dobson). 6.1 Introduction. 6.2 Ideal Diode and Thyristor Switching Rules. 6.3 Static VAR System Example. 6.4 Poincare Map. 6.5 Jacobian of Poincare Map. 6.6 Switching Damping. 6.7 Switching Time Bifurcations. 6.8 Diode Circuits. 6.9 Firing Angle Control. CHAPTER 7: NONLINEAR PHENOMENA IN OTHER POWER ELECTRONIC SYSTEMS. 7.1 Modeling a Nonlinear Inductor Circuit (J. H. B. Deane). 7.2 Inverters Under Tolerance Band Control (A. Magauer). 7.3 Nonlinear Noise Effects in Power Converters (P. T. Krein and P. Midya). 7.4 Nonlinear Phenomena in the Current Control of Induction Motors (/. Nagy and Z. Suto). 7.5 Analysis of Stability and Bifurcation in Power Electronic Induction Motor Drive Systems (Y. Kuroe). CHAPTER 8: NONLINEAR CONTROL AND CONTROL OF CHAOS. 8.1 Conventional Nonlinear Controls in Power Electronics (P. T. Krein). 8.2 Sliding Mode and Switching Surface Control (P. T. Krein). 8.3 Energy--Based Control in Power Electronics (A. M. Stankovic, G. Escobar, Ft. Ortega, and S. R. Sanders). 8.4 Ripple Correlation Control (P. T. Krein). 8.5 Control of Chaos (M. di Bernardo, G. Olivar, and C. Battle). 8.6 Closed--Loop Regulation of Chaotic Operation (J. L Rodriguez Marrero, R. Santos Bueno, and G. C. Verghese). 8.7 Control of Bifurcation (C. K. Tse and Y.--M. Lai). 8.8 Synchronization of Chaos (C. K. Tse). Index. About the Editors.

Zero-voltage switching technique in DC/DC converters

Abstract: A novel resonant switch operating under the principle of zero-voltage switching is presented. The basic configurations of the voltage-mode resonant switches are presented. The circuit's operating principles are described using a voltage-mode quasi-resonant boost converter. DC analysis of the converter is carried out. A new family of voltage-mode quasi-resonant converters are derived, and several members of this family are presented. The duality relationship between the zero-current switching technique and the zero-voltage switching technique is derived. These two techniques are compared using an example showing the duality between a current-mode quasi-resonant Buck converter and a voltage-mode quasi-resonant boost converter. The similarities and differences of the voltage-mode quasi-resonant converters and the Class-E converters are discussed. A 5 MHz 50 V to 5 V flyback converter employing the zero-voltage switching technique has been implemented. Design considerations and experimental results of this circuit are presented. >

Step-up switching-mode converter with high voltage gain using a switched-capacitor circuit

Abstract: A new circuit is proposed for a steep step-up of the line voltage. It integrates a switched-capacitor (SC) circuit within a boost converter. An SC circuit can achieve any voltage ratio, allowing for a boost of the input voltage to high values. It is unregulated to allow for a very high efficiency. The boost stage has a regulation purpose. It can operate at a relatively low duty cycle, thus avoiding diode-reverse recovery problems. The new circuit is not a cascade interconnection of the two power stages; their operation is integrated. The simplicity and robustness of the solution, the possibility of getting higher voltage ratios than cascading boost converters, without using transformers with all their problems, and the good overall efficiency are the benefits of the proposed converter.