scholarly journals Nonlinear Dynamics and Performance Analysis of a Buck Converter with Hysteresis Control

Computation ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 112
Author(s):  
Carlos Hoyos Velasco ◽  
Fredy Hoyos ◽  
John Candelo-Becerra
Keyword(s):  
State Space Model ◽  
Power Converter ◽  
Buck Converter ◽  
Switching Frequency ◽  
Load Variations ◽  
General Terms ◽  
Experimental Implementation ◽  
High Switching Frequency ◽  
And Performance ◽  
Hysteresis Control

This paper presents the mathematical modeling and experimental implementation of a Buck converter with hysteresis control. The system is described using a state-space model. Theoretical and simulation studies show that the zero hysteresis control leads to an equilibrium point with the implication of an infinite commutation frequency, while the use of a constant hysteresis band induces a limit cycle with a finite switching frequency. There exists a tradeoff between voltage output ripple and transistor switching frequency. An experimental prototype for the Buck power converter is built, and theoretical results are verified experimentally. In general terms, the Buck converter with the hysteresis control shows a robust control with respect to load variations, with undesired high switching frequency taking place for a very narrow hysteresis band, which is solved by tuning the hysteresis band properly.

scholarly journals Design of LQR controller for GaN based Buck converter

2020 ◽  
Vol 15 (2) ◽  
pp. 37-48
Author(s):  
Miklos Csizmadia ◽  
Miklos Kuczmann
Keyword(s):  
State Feedback ◽  
Design Procedure ◽  
Linear Quadratic Regulator ◽  
Power Converter ◽  
Buck Converter ◽  
Switching Frequency ◽  
Linear Quadratic ◽  
Calculating Method ◽  
High Switching Frequency ◽  
Lqr Controller

Abstract:This paper presents a design procedure of a switched-mode power converter, the well-known synchronous buck converter: the calculating method, and how to choose the parts of the converter are presented in detail, like the inductor, the capacitor and the semiconductors as well as the design of the state feedback. During the design process the efficiency and the high switching frequency are very important: the switching semiconductors are Gallium Nitride based. Then, a linear-quadratic regulator is designed and applied to the particular case of a buck converter.

scholarly journals Dual Interleaved LLC Converter for High Power Applications and Wide Load Range

2019 ◽  
Vol 25 (3) ◽  
pp. 4-9
Author(s):  
Michal Frivaldsky ◽  
Jan Morgos ◽  
Andrej Kanovsky
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Negative Impact ◽  
Power Converter ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Load Range ◽  
High Switching Frequency ◽  
Llc Resonant Converter ◽  
Operational Range

Dual interleaved LLC resonant converter with half bridge topology of main circuit characterized by high switching frequency (500 kHz), high power density (60 W/inch3) and high efficiency (above 96 %) over entire operational range (20 %–100 %) is described. Focus was given on the practical design of power converter, which will be able to fulfil requirements on wide load range operation characterized by upcoming normative. Since proposed topology is based on dual interleaved LLC converter, the resonant component´s critical tolerance was also investigated to secure reliable and optimal operational point. Consequently, proposals for elimination of intolerance negative impact are also described. The results of theoretical analysis were verified directly through experimental measurements. Experimental results are finally compared with upcoming industrial standard 80 Plus Titanium.

Implementation and Design of Voltage-Mode PFM Control Buck Power Converter

2013 ◽  
Vol 860-863 ◽  
pp. 2390-2394
Author(s):  
Min Chin Lee ◽  
Ruey Wun Jan
Keyword(s):  
Supply Voltage ◽  
Pulse Frequency ◽  
Power Converter ◽  
Buck Converter ◽  
Switching Frequency ◽  
Cmos Process ◽  
Pulse Frequency Modulation ◽  
Better Regulation ◽  
Chip Size ◽  
Voltage Feedback

A lower power consumption, smaller output ripple and better regulation buck dcdc converter controlled by voltage feedback and pulse-frequency modulation (PFM) mode is implemented in this paper. The converter operating in discontinuous conduction mode (DCM) is designed and simulated using the TSMC 0.18μm 1P6M CMOS Process. Hspice simulation results show that, the buck converter having chip size with power dissipation about 0.68mW. This chip can operate with input supply voltage from 1.2V to 1.8V, and switching frequency from 249KHz () to 50KHz (), and its output voltage can stable at 1.0V and less than 110mV ripple voltage at maximum loading current 100 mA.

scholarly journals A Comparative Study on the Switching Performance of GaN and Si Power Devices for Bipolar Complementary Modulated Converter Legs

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1146 ◽  
Author(s):  
Baochao Wang ◽  
Shili Dong ◽  
Shanlin Jiang ◽  
Chun He ◽  
Jianhui Hu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Dead Time ◽  
High Electron Mobility Transistors ◽  
Buck Converter ◽  
Switching Frequency ◽  
High Electron ◽  
Switching Loss ◽  
Gan Hemt ◽  
Switching Losses ◽  
High Switching Frequency

The commercial mature gallium nitride high electron mobility transistors (GaN HEMT) technology has drawn much attention for its great potential in industrial power electronic applications. GaN HEMT is known for low on-state resistance, high withstand voltage, and high switching frequency. This paper presents comparative experimental evaluations of GaN HEMT and conventional Si insulated gate bipolar transistors (Si IGBTs) of similar power rating. The comparative study is carried out on both the element and converter level. Firstly, on the discrete element level, the steady and dynamic characteristics of GaN HEMT are compared with Si-IGBT, including forward and reverse conducting character, and switching time. Then, the elemental switching losses are analyzed based on measured data. Finally, on a complementary buck converter level, the overall efficiency and EMI-related common-mode currents are compared. For the tested conditions, it is found that the GaN HEMT switching loss is much less than for the same power class IGBT. However, it is worth noting that special attention should be paid to reverse conduction losses in the PWM dead time (or dead band) of complementary-modulated converter legs. When migrating from IGBT to GaN, choosing a dead-time and negative gate drive voltage in conventional IGBT manner can make GaN reverse conducting losses high. It is suggested to use 0 V turn-off gate voltage and minimize the GaN dead time in order to make full use of the GaN advantages.

scholarly journals Efficient FPSoC Prototyping of FCS-MPC for Three-Phase Voltage Source Inverters

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1074 ◽  
Author(s):  
Eduardo Zafra ◽  
Sergio Vazquez ◽  
Hipolito Guzman Miranda ◽  
Juan A. Sanchez ◽  
Abraham Marquez ◽  
...  
Keyword(s):  
Digital Signal Processor ◽  
Computation Time ◽  
Digital Signal ◽  
Power Converter ◽  
Voltage Source ◽  
Switching Frequency ◽  
Digital Controllers ◽  
Voltage Source Inverters ◽  
High Switching Frequency ◽  
Three Phase

This work describes an efficient implementation in terms of computation time and resource usage in a Field-Programmable System-On-Chip (FPSoC) of a Finite Control Set Model Predictive Control (FCS-MPC) algorithm. As an example, the FCS-MPC implementation is used for the current reference tracking of a two-level three-phase power converter. The proposed solution is an enabler for using both complex control algorithms and digital controllers for high switching frequency semiconductor technologies. An original HW/SW (hardware and software) system architecture for an FPSoC is designed to take advantage of a modern operating system, while removing time uncertainty in real-time software tasks, and exploiting dedicated FPGA fabric for the most complex computations. In addition, two different architectures for the FPGA-implemented functionality are proposed and compared in order to study the area-speed trade-off. Experimental results show the feasibility of the proposed implementation, which achieves a speed hundreds of times faster than the conventional Digital Signal Processor (DSP)-based control platform.

scholarly journals TRANSITION FROM PERIODICITY TO CHAOS IN A PWM-CONTROLLED BUCK CONVERTER WITH ZAD STRATEGY

2005 ◽  
Vol 15 (10) ◽  
pp. 3245-3264 ◽  
Author(s):  
FABIOLA ANGULO ◽  
ENRIC FOSSAS ◽  
GERARD OLIVAR
Keyword(s):  
Poincaré Map ◽  
Pulse Width Modulation ◽  
Power Converter ◽  
Buck Converter ◽  
Switching Frequency ◽  
Poincare Map ◽  
Order Error ◽  
Tent Map ◽  
Error Dynamics ◽  
The One

The transition from periodicity to chaos in a DC-DC Buck power converter is studied in this paper. The converter is controlled through a direct Pulse Width Modulation (PWM) in order to regulate the error dynamics at zero. Results show robustness with low output error and a fixed switching frequency. Furthermore, some rich dynamics appear as the constant associated with the first-order error dynamics decreases. Finally, a transition from periodicity to chaos is observed. This paper describes this transition and the bifurcations in the converter. Chaos appears in the system with a stretching and folding mechanism. It can be observed in the one-dimensional Poincaré map of the inductor current. This Poincaré map converges to a tent map with the variation of the system parameter ks.

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