A Novel Control Scheme for Power Factor Improvement in Modified Bridgeless Boost Converter

2015 ◽  
Vol 787 ◽  
pp. 833-837
Author(s):  
Tamizhselvan Annamalai ◽  
V. Rajini
Keyword(s):  
Power Factor ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Input Resistance ◽  
Input Voltage ◽  
Input Power ◽  
Boost Converter ◽  
Green Energy ◽  
Power Losses ◽  
Current Path

In Green Energy technologies like wind energy conversion systems and Domestic applications like SMPS and UPS systems, the input voltage amplitude and input frequency are time varying in nature. Fast-Escalating and extremely challenging high efficiency requirements for AC-DC power supplies for notebooks, desktop computers are to minimize the power losses (Conduction losses). In the conventional rectifiers power losses are more and power factor is poor resulting in loss of efficiency. Normally, the bridgeless topologies, also referred to as dual boost power factor correction (PFC) rectifiers, may reduce the conduction losses by reducing the number of semi-conductor components in the line current path. Power supply units have to make the load compatible with the source. The presence of non-linear load results in poor power factor operation and produces harmonic components in the line. So PFC techniques are necessary to meet harmonic regulations and standards such as IEC 61000-3-2 and IEEE 519. A modified bridgeless topology may be used for such applications. A novel switching controller is developed that regulates the input resistance to a desired value. Hence input power factor is unity and also the total harmonic distortion is controlled to a tolerable limit. In the proposed model, the modified bridgeless boost converter is activated in to a pure resistance mode. Finally the performance of the modified bridgeless boost converter is compared with the existing basic bridgeless boost converter.

scholarly journals Power Factor Corrector Based on Parallel Quasi- Resonant Pulse Converter with Fast Current Loop

2013 ◽  
Vol 3 (1) ◽  
pp. 5-11 ◽  
Author(s):  
Yuriy Denisov ◽  
Serhii Stepenko
Keyword(s):  
Power Factor ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Current Loop ◽  
Switching Frequency ◽  
Zero Current Switching ◽  
High Switching Frequency ◽  
Power Factor Corrector ◽  
Pulse Converter

Abstract The problems, devoted to power quality and particularly power factor correction, are of great importance nowadays. The key requirements, which should be satisfied according to the energy efficiency paradigm, are not limited only by high quality of the output voltage (low total harmonic distortion), but also assume minimal power losses (high efficiency) in the power factor corrector (PFC). It could be satisfied by the use of quasi-resonant pulse converter (QRPC) due to its high efficiency at high switching frequency instead of the classical pulse-width modulated (PWM) boost converter. A dynamic model of QRPC with zero current switching (ZCS) is proposed. This model takes into account the main features of QRPC-ZCS as a link of a PFC closed-loop system (discreteness, sharp changes of parameters over switching period, input voltage impact on the gain). The synthesized model is also valid for conventional parallel pulse converter over an active interval of commutation. The regulator for current loop of PFC was synthesized based on digital filter using proposed model by the criterion of fast acting.

scholarly journals Modelling of three phase SVPWM AC-AC converter using unity power factor control

2019 ◽  
Vol 10 (4) ◽  
pp. 1823
Author(s):  
Saidah Saidah ◽  
Hari Sutiksno ◽  
Bambang Purwahyudi ◽  
Taufik Taufik
Keyword(s):  
Power Factor ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Input Voltage ◽  
Input Power ◽  
Current Waveform ◽  
Unity Power Factor ◽  
Dc Voltage ◽  
Three Phase ◽  
Power Factor Control

This paper introduces the modelling of a novel three phase AC-AC converter with indirect use of a capacitor as DC voltage link. The proposed converter has high efficiency because it uses Space Vector PWM (SVPWM) technique at both rectificier and inverter stages to operate the pulse width modulation in IGBT switches. The novel converter is equipped with a power factor control to shape the rectifier input current waveform to be sinusoidal and to be in phase with the input voltage. To keep the DC voltage stable, the converter utilizes PI controllers. Simulations are conducted for output voltage from 120 to 300 Volts with output frequency ranging from 30 Hz to 60 Hz. The simulation results show that the converter is able to maintain stable the DC voltage and current. Furthermore, the model demonstrates the benefits of proposed converter in terms of acquiring high input power factor and sinusoidal current waveform at the output side of the inverter.

Design and Simulation of PFC Converter for Brushless SRM Drive

2016 ◽  
Vol 7 (3) ◽  
pp. 625 ◽  
Author(s):  
M. Rama Subbamma ◽  
V. Madhusudhan ◽  
K.S.R Anjaneyulu
Keyword(s):  
Power Factor ◽  
High Efficiency ◽  
Industrial Applications ◽  
Input Power ◽  
Boost Converter ◽  
Air Conditioner ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Bridge Rectifier ◽  
Speed Response

In most of the industrial applications, Switched Reluctance Motor (SRM) is mainly employed due to the reasons like having low maintenance and high efficiency. SRM consists of windings only on its stator, but would not have any windings on rotor thus having very simple construction. The available supply is AC. But AC cannot be directly supplied to SRM when used for air-conditioner application which is employed in this paper. Also power factor in the system needs to be corrected when using a SRM drive. Thus AC supply is fed to power factor correction (PFC) converter which is Buck-Boost converter here in this paper. The output of the PFC converter is fed to SRM through a simple asymmetrical converter. This PFC circuit consists of a simple diode bridge rectifier with Buck-Boost DC-DC converter. A suitable control circuit was proposed to control the input power factor under various loading conditions. This paper gives analysis of SRM drive for air-conditioner application with Buck-Boost converter based PFC circuit. A Matlab/simulink based model is developed and simulation results are presented. Simulation is carried out for different speed response.

Simulation Study of PFC Boost Converter Based on Predicted Average Current Control

2012 ◽  
Vol 462 ◽  
pp. 738-742 ◽  
Author(s):  
Man Yuan Ye ◽  
Song Li
Keyword(s):  
Power Factor ◽  
Control Strategies ◽  
Harmonic Distortion ◽  
Input Power ◽  
Boost Converter ◽  
Current Control ◽  
Simulation Software ◽  
Voltage Control Strategy ◽  
Average Current ◽  
Average Current Control

Introduced to predict average current control PFC Boost converter structure, and analyzes its operating principle, the average current control strategies equation is given by derivation. And a model of predict average current control PFC Boost converter is gained using Matlab Simulink simulation software and SimPowerSystems toolbox. Simulation results show that the predicted average current control PFC Boost converter with control circuit is simple and reliable, high input power factor, anti-interference ability, current harmonic distortion, etc, and is forecast to average voltage control strategy for the active power factor correction provides a novel, simple and feasible control methods.

A Single-Switch HPF AC-to-DC Converter with Low Voltage Ripple

2013 ◽  
Vol 284-287 ◽  
pp. 2445-2449
Author(s):  
Hung Liang Cheng ◽  
Chien Hsuan Chang ◽  
Chun An Cheng ◽  
En Chih Chang ◽  
Li Ren Yu
Keyword(s):  
Power Factor ◽  
Low Voltage ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Boost Converter ◽  
Flyback Converter ◽  
Switching Losses ◽  
Voltage Ripple ◽  
Sinusoidal Waveform ◽  
Conduction Mode

This paper proposed a single-stage single-switch ac-to-dc converter which is derived by integrating a boost converter and a flyback converter. Only one active switch and simple control are required. The boost converter performs as a power-factor corrector (PFC) which is designed to operate at discontinue-conduction mode (DCM) to makes the input current be a sinusoidal waveform and in phase with the input voltage. High power factor and low total current harmonic distortion (THD) are ensured. The flyback converter further regulates the output voltage of the boost converter to provide an isolated dc voltage with low voltage ripple. The flyback converter is designed to operate at continue-conduction mode (CCM) to have the transformer current of a low peak value. It will be effectively reduce the switching stress and the switching losses of semiconductor components. The paper conducts the mathematical equations for the converter circuits, and then designing the circuit parameters. A prototype circuit designed for a 100 W output power was built and tested. Satisfactory results are obtained experimentally.

scholarly journals Input switched closed-loop single phase SEPIC controlled rectifier with improved performances

2021 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
Md. Shamsul Arifin ◽  
Mohammad Jahangir Alam
Keyword(s):  
Power Factor ◽  
Closed Loop ◽  
Harmonic Distortion ◽  
Input Voltage ◽  
Input Power ◽  
Open Loop ◽  
Dc Power ◽  
Wide Range ◽  
Input Side ◽  
Flow Through

DC power supply has become the driving source for some essential modern applications. Thereby, DC power conditioning has become a significant issue for engineers. Typically used rectifiers associated with a bridge structure is nonlinear in nature. Thereby, the current at input side of the rectifier contains harmonics, which also flow through the power line. The presence of harmonics causes several interruptions and reduce power quality. In this regard, a new close loop SEPIC controlled rectifier is proposed in this paper. The conventional scheme is arranged with a rectifier connected to a DC-DC converter, which is an open loop system. Consequently, such system cannot regulate voltage at load varying condition. The proposed SEPIC controlled rectifier can regulate voltage under load varying condition for a wide range. Additionally, the performance in terms of total harmonic distortion (THD) of input current and power factor at AC side are also within satisfactory range for the closed loop configuration. The controlled rectifier has four operating phases associated with switching states and input voltage polarity. The close loop configuration also incorporates a current and a voltage loop at the feedback path. The comparative studies have been performed among the proposed closed loop construction, the open-loop structure as well as the conventional construction. The effectiveness of the proposed controlled rectifier is verified in terms of THD and input power factor considering the results obtained from simulation.

Power Quality Improvement in Single Phase AC-DC Three Level Boost Converter Using PI and SMC

2014 ◽  
Vol 573 ◽  
pp. 72-77 ◽  
Author(s):  
J. Gnana Vadivel ◽  
A. Aswini ◽  
N. Senthil Kumar ◽  
S.T. Jaya Christa
Keyword(s):  
Single Phase ◽  
High Efficiency ◽  
Sliding Mode ◽  
Sudden Change ◽  
Harmonic Distortion ◽  
Load Condition ◽  
Input Voltage ◽  
Boost Converter ◽  
Sliding Mode Controller ◽  
Sinusoidal Input

This paper proposes the single phase ac-dc three-level boost converter with controller circuit such as sliding mode controller, proportional integral controller and employs three-level pulse width modulation technique. Solid state switched mode three-level boost converter along with the control methods achieve unity power factor, high efficiency, precisely regulated dc output in boost converter, reduced output voltage ripple and less than 5% of total harmonic distortion with unidirectional power flow. The outstanding feature of proposed control scheme is line current is driven to follow sinusoidal reference current command which is in phase with sinusoidal input voltage and guaranteeing dc-link capacitor voltage balance in every switching cycle. Comparative analysis of PI controller and sliding mode controller is carried out. The performances of converter under load variation, unbalanced load condition and sudden change in load condition for various control strategies were verified.

scholarly journals A Novel Single-Switch Single-Stage LED Driver with Power Factor Correction and Current Balancing Capability

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1340
Author(s):  
Yih-Her Yan ◽  
Hung-Liang Cheng ◽  
Chun-An Cheng ◽  
Yong-Nong Chang ◽  
Zong-Xun Wu
Keyword(s):  
Power Factor ◽  
High Power ◽  
Pulse Width Modulation ◽  
Power Factor Correction ◽  
Harmonic Distortion ◽  
Boost Converter ◽  
Single Stage ◽  
Led Driver ◽  
Flyback Converter ◽  
High Power Factor

A novel single-switch single-stage high power factor LED driver is proposed by integrating a flyback converter, a buck–boost converter and a current balance circuit. Only an active switch and a corresponding control circuit are used. The LED power can be adjusted by the control scheme of pulse–width modulation (PWM). The flyback converter performs the function of power factor correction (PFC), which is operated at discontinuous-current mode (DCM) to achieve unity power factor and low total current harmonic distortion (THDi). The buck–boost converter regulates the dc-link voltage to obtain smooth dc voltage for the LED. The current–balance circuit applies the principle of ampere-second balance of capacitors to obtain equal current in each LED string. The steady-state analyses for different operation modes is provided, and the mathematical equations for designing component parameters are conducted. Finally, a 90-W prototype circuit with three LED strings was built and tested. Experimental results show that the current in each LED string is indeed consistent. High power factor and low THDi can be achieved. LED power is regulated from 100% to 25% rated power. Satisfactory performance has proved the feasibility of this circuit.

scholarly journals High gain boost converter with modified voltage multiplier for stand alone PV system

2019 ◽  
Vol 14 (1) ◽  
pp. 185
Author(s):  
Getzial Anbu Mani ◽  
A. K. Parvathy
Keyword(s):  
High Efficiency ◽  
Input Voltage ◽  
High Gain ◽  
Boost Converter ◽  
Pv System ◽  
Boost Converters ◽  
Low Input ◽  
Voltage Multiplier ◽  
Photo Voltaic ◽  
Current Ripple

<p>Boost converters of high gain are used for photo voltaic systems to obtain high efficiency. These high gain Boost converters gives increased output voltage for a low input produces high outputs for low input voltage. The High gain boost converters have the following merits. Conduction losses input current ripple and stress across the switches is reduced while the efficiency is increases. The high gain of the converters with the above said merits is obtained by changing the duty cycle of switches accordingly .In this paper a boost converter working with interleaved concept along with a additional Nstage voltage Multiplier has been carried out by simulation using MATLAB/ simulink and the mathematical modeling of various parameters is also done.</p>

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