Study on Dynamical Behaviors Mechanism of Sine Voltage Compensation in Buck Converters

2014 ◽  
Vol 536-537 ◽  
pp. 1497-1500
Author(s):  
Fang Ying Zhang ◽  
Wei Hu ◽  
Xiao Li Long ◽  
Xin Bing Chen
Keyword(s):  
Theoretical Analysis ◽  
Duty Cycle ◽  
Monodromy Matrix ◽  
Buck Converter ◽  
Buck Converters ◽  
Stabilization Control ◽  
Dynamical Behaviors ◽  
Voltage Compensation ◽  
Signal Changes ◽  
Compensation Signal

This paper analyzes the effect of stable behaviors when amplitude, phase of sine voltage compensation signal are added in the system, reveals that the dynamical behaviors mechanism that sine voltage compensation signal changes feedback voltage-mode controlled buck converter lies in changing the duty cycle without impacting the system stable error via analyzing the change of period multiplier in Monodromy matrix and conditions of period bifurcation, and finally achieves stabilization control for bifurcation and chaotic behaviors. The simulation and experimental results prove the correctness of the theoretical analysis.

scholarly journals Synthesis of A Digital PID/LQR Control System for Duty-Cycle Modulation Buck Converters

2020 ◽  
pp. 185-189
Author(s):  
Paul Owoundi Etouke ◽  
Jean Mbihi ◽  
Leandre Nneme Nneme
Keyword(s):  
Control System ◽  
Transfer Function ◽  
Duty Cycle ◽  
Linear Quadratic Regulator ◽  
Buck Converter ◽  
Step Response ◽  
Buck Converters ◽  
Linear Quadratic ◽  
Lqr Control ◽  
Digital Pid

<p>This research paper presents a synthesis approach of a digital optimal PID/LQR control system for DCM (duty-cycle cycle modulation) Buck converters. The step response of the DCM Buck converter is obtained under Multisim virtual simulation framework. The related data file is saved as *.SCP format, and imported into EditPad Lite7 editor, then exported as Matlab file to be processed. The transfer function of the DCM Buck converter is computed from the imported step response data. Then, using the zoh (zero order holder) discretization method with 100 ms resampling period, the z-transfer function of the DCM Buck converter is computed, and that of the analog optimal PID/LQR(linear quadratic regulator) controller is calculated using Tustin’s discretization technique. Furthermore, the step response of the related closed loop digital PID control system is simulated and compared to that of the original analog PID/LQR control system. The simulation results obtained are presented in order to show the high precision as well as the reliability of Matlab-based synthesis of digital optimal PID/LQR control systems for DCM Buck converters.</p>

Interleaved Synchronous Buck Converter with a Coupled Inductor

2012 ◽  
Vol 424-425 ◽  
pp. 793-795
Author(s):  
Hyun Lark Do
Keyword(s):  
Theoretical Analysis ◽  
Power Flow ◽  
Buck Converter ◽  
Magnetic Component ◽  
Switching Frequency ◽  
Buck Converters ◽  
Loosely Coupled ◽  
Experimental Prototype ◽  
And Performance ◽  
Interleaving Technique

An interleaved synchronous buck converter with a coupled inductor is proposed in this paper. In the proposed converter, two synchronous buck converters operate with the interleaving technique. Moreover, a single magnetic component is utilized. By using a loosely coupled inductor, its leakage inductances are utilized to control the power flow. Theoretical analysis and performance of the proposed converter were verified on an experimental prototype operating at 100 kHz switching frequency

scholarly journals Nonlinear Dynamics and Stability Analysis of a Three-Cell Flying Capacitor DC-DC Converter

2021 ◽  
Vol 11 (4) ◽  
pp. 1395
Author(s):  
Abdelali El Aroudi ◽  
Natalia Cañas-Estrada ◽  
Mohamed Debbat ◽  
Mohamed Al-Numay
Keyword(s):  
Steady State ◽  
Stability Analysis ◽  
Monodromy Matrix ◽  
Dynamical Behavior ◽  
Period Doubling ◽  
Simple Expression ◽  
Buck Converter ◽  
State Variables ◽  
Bifurcation Phenomena ◽  
The Stability

This paper presents a study of the nonlinear dynamic behavior a flying capacitor four-level three-cell DC-DC buck converter. Its stability analysis is performed and its stability boundaries is determined in the multi-dimensional paramertic space. First, the switched model of the converter is presented. Then, a discrete-time controller for the converter is proposed. The controller is is responsible for both balancing the flying capacitor voltages from one hand and for output current regulation. Simulation results from the switched model of the converter under the proposed controller are presented. The results show that the system may undergo bifurcation phenomena and period doubling route to chaos when some system parameters are varied. One-dimensional bifurcation diagrams are computed and used to explore the possible dynamical behavior of the system. By using Floquet theory and Filippov method to derive the monodromy matrix, the bifurcation behavior observed in the converter is accurately predicted. Based on justified and realistic approximations of the system state variables waveforms, simple and accurate expressions for these steady-state values and the monodromy matrix are derived and validated. The simple expression of the steady-state operation and the monodromy matrix allow to analytically predict the onset of instability in the system and the stability region in the parametric space is determined. Numerical simulations from the exact switched model validate the theoretical predictions.

scholarly journals PERANCANGAN BUCK CONVERTER SEBAGAI PENGATURAN LAJU KECEPATAN MOTOR DC PADA GERAK LONGITUDINAL DAN TRANSVERSAL PROTOTYPE OVERHEAD CRANE

TRANSIENT ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 319
Author(s):  
Iqba Anggiawan ◽  
Tejo Sukmadi ◽  
Mochammad Facta
Keyword(s):  
Duty Cycle ◽  
Buck Converter ◽  
Overhead Crane

Crane merupakan alat pendukung pada bidang industri, dalam penerapannya beban yang ditanggung oleh crane beragam, maka diperlukan sebuah sistem dalam mengatur kecepatan kerja crane untuk menyesuaikan jenis barang yang ditanggung. Dalam penelitian ini dilakukan perancangan prototype overhead crane dengan penggerak motor DC magnet permanen CSD80A1-A yang di dioperasikan oleh buck converter. Pengaturan kecepatan putar motor DC magnet permanen sebagai penggerak  prototype overhead crane dilakukan dengan memvariasikan nilai duty cycle pada buck converter. Prototype overhead crane ini dilakukan pengujian dengan variasi tidak dibebani dan dibebani sebesar 5 kg. Berdasarkan hasil pengukuran buck converter, nilai output terendah terjadi pada gerakan forward transversal tidak dibebani dengan duty cycle 60% yang menghasilkan daya keluaran 7,74 watt, kecepatan putar 76,53 rpm, dan torsi 0,96 Nm. Nilai output tertinggi terjadi pada gerakan forward longitudinal dibebani 5 kg dengan duty cycle 90%, yang menghasilkan daya keluaran 24,79 watt, kecepatan putar 80,59 rpm, dan torsi 2,93 Nm.

scholarly journals Speed control of synchronous machine by changing duty cycle of DC/DC buck converter

AIMS Energy ◽  
2015 ◽  
Vol 3 (4) ◽  
pp. 728-739 ◽  
Author(s):  
Rashid Al Badwawi ◽  
◽  
Mohammad Abusara ◽  
Tapas Mallick
Keyword(s):  
Duty Cycle ◽  
Speed Control ◽  
Synchronous Machine ◽  
Buck Converter

Integrated Current Sensing Technology for Synchronous Buck Converters

2013 ◽  
Vol 2013 (1) ◽  
pp. 000776-000781
Author(s):  
Evan Reutzel ◽  
Rengang Chen ◽  
Scott Ragona ◽  
David Jauregui
Keyword(s):  
Steady State ◽  
Buck Converter ◽  
Buck Converters ◽  
Lead Frame ◽  
Current Sensing ◽  
Operating Modes ◽  
Common Lead ◽  
Sensing Technology ◽  
Steady State Operation ◽  
Better Than

A lossless current sensing technique is proposed, which takes advantage of the on-resistance of the sync FET used in the buck converter to sense the current flowing through the device and to reconstruct an emulated version of the inductor current. The current sensing circuit is integrated into the MOSFET driver and co-packaged with a set of FETs in a stacked die arrangement with common lead-frame shared between driver and sync FET to enable accuracy equivalent to or better than DCR sensing. In addition to steady-state operation, modern multiphase controllers are required to drive the buck converter in other operating modes including: Diode Emulation Mode (DEM), body-braking, tri-state (phase off). These additional modes are also correctly emulated by the current sense logic.

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%.

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