Modelling, design and control of a SEPIC power factor corrector for single-phase rectifiers: experimental validation (original) (raw)
Related papers
Mathematics and Computers in Simulation, 2013
In this paper, a comparative analysis of three multi-loops control schemes dedicated to the single ended primary inductance converter (SEPIC) power factor corrector (PFC) is presented. The first control technique uses a robust hysteresis current controller; the second control strategy consists of a frequency-domain linear design of regulators on the basis of a small-signal averaged model of the converter, whereas the third control design method uses the input/output feedback linearization approach applied on the largesignal state-space averaged model of the converter. In order to verify and compare the performance of all control schemes, numerical simulations are carried out on a switching-functions-based model of the converter, which is implemented using Matlab/Simulink. The control systems are tested under both rated and disturbed operating conditions. The systems performance is evaluated in terms of source current total harmonic distortion (THD), input power factor, and DC voltage regulation toward load disturbances.
IET Power Electronics, 2009
A new single-phase power factor corrector (PFC) based on the Sheppard-Taylor topology is studied. Compared with conventional PFCs, this topology facilitates a better input current tracking, lower voltage stresses across the devices and larger output voltage range for the same operating area. The converter is integrated as a PFC at the DC-end of a single-phase diode bridge. Pulse-width-modulated (PWM) multi-loops control schemes are proposed and developed in order to ensure a unity power factor at the AC-source side and a regulated voltage at the DC-load side. The first control method uses the simple and robust hystereticbased controller; the second employs a conventional PI regulator; and the third is based on the model nonlinearity compensation approach. The design of the last two control methods is based on the knowledge of a mathematical model that would accurately represent the converter. This model is developed in this paper using the state-space averaging technique, and then the small-signal transfer functions of the converter are derived for linear control design purpose. The performance of the different control strategies is evaluated through simulation experiments carried out on a numerical version of the converter. The implemented model of the converter is obtained by using the switching function technique. The control system is tested under both rated and disturbed operating conditions. The system performance is evaluated in terms of source current total harmonic distortion (THD), input power factor, DC voltage stabilization, and regulation following load variations.
In this paper, a comparative analysis of two nonlinear control schemes proposed for a Single Ended Primary Inductance Converter (SEPIC) Power Factor Corrector (PFC) is presented. The SEPIC converter, compared to conventional buck or boost ones, allows a low current ripple at the input for a relatively low level of the DC-bus voltage. Consequently, the high frequency filter needed at the AC-side of a buck converter is avoided, and the high voltage stresses applied on the switches are significantly reduced with respect to the boost converter. The converter is integrated at the DCend of a single-phase diode bridge. In order to ensure a unity power factor at the AC-source side and a regulated voltage at the DC-load side, a multiple-loops feedback control scheme has to be developed. Two control strategies are considered in this paper. The first one uses a robust hysteresis current controller, whereas the other method is based on the application of the input/output feedback linearization technique on a state-space averaged model of the converter. In order to verify and compare the performance of both control schemes, numerical simulations are carried out on a switching-functions-based model of the converter, which is implemented using Matlab/Simulink. The proposed model of the converter is valid in the Continuous Current Mode (CCM) and the Discontinuous Current Mode (DCM). The control systems are tested under both rated and disturbed operating conditions. The systems performance is evaluated in terms of source current Total Harmonic Distortion (THD), input power factor, DC voltage regulation and robustness toward a load disturbance.
Simple controller for single-phase power factor correction rectifier
IET Power Electronics, 2010
This study proposes a simple low-cost modulating duty cycle analogue controller to reduce line frequency harmonics for high power factor boost rectifier. The proposed method eliminates the need for current sensing, and simultaneously offers the performance results comparable to those of continuous conduction mode (CCM). This scheme also maintains the simplicity comparable to that of discontinuous conduction mode (DCM). Only the output voltage and the rectified input voltage are monitored to vary the duty cycle of the boost switch within a line cycle so that the third-order harmonic, which is the lowest order harmonic of the input current, is reduced. As a result, the total harmonic distortion (THD) of the line current and thus the input power factor is improved. Moreover, the rectifier shows a good transient performance where the converter's output voltage overshoots during input voltage/load transients is reduced. The proposed method is developed for constant switching frequency boost rectifier. Simulation and experimental results are presented to verify the effectiveness of the proposed control method.
BRIDGELESS SEPIC POWER FACTOR CORRECTION RECTIFIER
this paper, the Single Ended Primary Inductor converter (SEPIC) is used to achieve high power factor with reduced input current ripple. The conventional power factor correction suffers from high conduction losses due to the diode bridge at the input side. Thus bridgeless SEPIC converter is used to avoid conduction loss by using only two semiconductor switches in the current flowing path during each switching cycle. By implementing the improved topology in DCM
Bridgeless Discontinuous Conduction Mode SEPIC Power Factor Correction Rectifier
Abstract-This paper deals with modelling and simulation of Single phase AC-DC Bridgeless Discontinuous Conduction Mode (DCM) with Single Ended Primary Inductance Converter (SEPIC) for Power Factor Correction (PFC) rectifier . The topology is improved by the absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each switching cycle which results in lesser conduction losses and improved thermal management compared to the conventional SEPIC converters. By implementing the improved topology in DCM it ensures almost unity power factor in a simple and effective manner. The DCM operation gives additional advantages such as zero-current turn-on in the power switches, zero-current turn-off in the output diode and reduces the complexity of the control circuitry. Performance comparisons between the improved and conventional SEPIC PFC rectifier are carried out using Pspice software and results are presented
THE DESIGN AND IMPLEMENTATION OF A SINGLE-PHASE POWER FACTOR CORRECTION CIRCUIT
iaeme
The focus of the present work is on introducing the power electronics community to the modeling and simulation of power factor corrected (PFC) converters. These techniques not only help to develop a deeper understanding of these converters but also to evaluate performance and feasibility of control strategies and topological features without fabrication of an actual system. Important PFC converter topologies are modeled and simulated. Simulation results of a single-phase boost converter are then compared to simulation results obtained by SIMULINK/ SimPower Systems as well as experimental results to provide an overview of the capabilities and limitations of various approaches. It is expected that this work will be of use to students as well as researchers who are interested in studying and researching PFC converters.
TECCIENCIA, 2013
This paper presents the detailed analysis of a single-phase rectifier with high power factor correction in half-bridge boost configuration (RPFCU-HBB). The purpose of this work was to achieve a unity power factor and regulated output voltage. Modeling and linearization around the RPFCU-HBB point of operation are exposed in detail. The analysis and design considerations of the current controller and the output voltage using the average current method are given. The control scheme to eliminate the voltage unbalance of the two output condensers is discussed in detail. The theoretical results are checked through the simulation of the RPFCU-HBB switch model, as well as through experimental work. By using the following parameters in the experimental prototype: input voltage of 120 Vrms, output power of 80 W, and output voltage of 450 V, we obtain a power factor of 0.99 and a total harmonic distortion of 2.5%.
has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. iii Mather, Barry A. (Ph.D., Electrical Engineering) Digital Control Techniques for Single-Phase Power Factor Correction Rectifiers Thesis directed by Professor Dragan Maksimović Tightening governmental regulations and industry standards for input current harmonics and input power factor correction (PFC) of common electronic devices such as servers, computers and televisions continues to increase the need for high-performance, low-cost power factor correction controllers. In response to this need, digital non-linear carrier (DNLC) PFC control has been developed and is presented in this thesis. DNLC PFC control offers many unique advantages over existing PFC control techniques in terms of design simplicity, low harmonic current shaping over a wide load range including CCM and DCM operation and a reliable, inexpensive digital implementation based on low-resolution analog-to-digital converters (A/D's) and digital pulse width modulator (DPWM). Implementation of the controller requires no microcontroller or digital signal processor (DSP) programming, and is well suited for a simple, low-cost integrated-circuit realization. DNLC PFC control is derived and analyzed for single-phase universal input PFC boost rectifiers. Further analysis of the operation of digitally controlled PFC rectifiers leads to the development of voltage loop compensator design constraints that avoid limit-cycling of the voltage loop. It is demonstrated that voltage loop limit-cycling is unavoidable when using traditional PFC control techniques under certain output loading conditions. However, it is also shown that voltage loop limit-cycling is avoidable under the same operating conditions when a DNLC PFC controller is implemented. Additionally, a unique output voltage sensing A/D is also developed that improves the PFC voltage loop transient response to load transients when paired with the DNLC PFC controller. Experimental results are shown for a 300W universal input boost PFC rectifier. iv
Analysis and design of an isolated single-phase power factor corrector with a fast regulation
Electric Power Systems Research, 2011
This paper presents an analysis and a modeling approach to obtain a small-signal model design and the digital implementation of a linear control technique for single-phase boost power factor correctors (PFC). Such converters present nonlinear characteristics and approximations of them are used to drive the models. The proposed circuit significantly improves the dynamic response of the converter to load steps without the need of a high crossover frequency of the voltage loop by adding low-pass filter. So, a low distortion of the input current is easily achieved. This controller has been verified via simulation in Simulink using a continuous time plant model and a discrete time controller. Real-time implementation is performed on an experimental test bench utilizing a rapid prototyping tool. The controller is experimentally confirmed for steady-state performance and transient response.