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Single-phase high power-factor boost ZCS pre-regulator operating in critical conduction mode

Canesin, C. A.; Goncalves, FAS; IEEE
Fonte: IEEE Publicador: IEEE
Tipo: Conferência ou Objeto de Conferência Formato: 746-751
ENG
Relevância na Pesquisa
75.84%
This paper presents a new single-phase interleaved high power factor boost pre-regulator operating in critical conduction mode, where the switches and boost diode performing zero-current commutations during its turn-off, eliminating the disadvantages related to the reverse recovery losses and electromagnetic interference problems of the boost diode, when operating in the continuous conduction mode. The interleaving technique is applied in the power cell, providing a significant input current ripple reduction in comparison to discontinuous mode of operation, due to its input current continuous conduction operation. This paper presents a complete modeling for the converter operating in critical conduction mode, resulting in an improved design procedure for interleaved techniques with high input power factor, a complete design procedure, and main simulation results from a design example with two interleaved cells rated at 1kW, 400V output voltage and 220V rms input voltage.

Novel high-power-factor ZCS-PWM preregulators

Wakabayashi, F. T.; Bonato, M. J.; Canesin, C. A.
Fonte: Institute of Electrical and Electronics Engineers (IEEE) Publicador: Institute of Electrical and Electronics Engineers (IEEE)
Tipo: Artigo de Revista Científica Formato: 322-333
ENG
Relevância na Pesquisa
75.88%
This paper introduces novel zero-current-switching (ZCS) pulsewidth-modulated (PWM) preregulators based on a new soft-commutation cell, suitable for insulated gate bipolar transistor applications. The active switches in these proposed rectifiers turn on in zero current and turn off in zero current-zero voltage. In addition, the diodes turn on in zero voltage and their reverse-recovery effects over the active switches are negligible. Moreover, based on the proposed cell, an entire family of de-to-de ZCS-PWM converters can be generated, providing conditions to obtain naturally isolated converters, for example, derived buck-boost, Sepic. and Zeta converters. The novel ac-to-dc ZCS-PWM boost and Zeta preregulators are presented in order to verify the operation of this soft-commutation cell, In order to minimize the harmonic contents of the input current, increasing the ac power factor, the average-current-mode control is used, obtaining preregulators with ac power factor near unity and high efficiency at wide load range. The principle of operation, theoretical analysis, design example, and experimental results from test units for the novel preregulators are presented. The new boost preregulator was designed to nominal values of 1.6 kW output power...

Power Factor Correction Boost Converter Based on the Three-State Switching Cell

Robles Balestero, Juan Paulo; Tofoli, Fernando Lessa; Fernandes, Rodolfo Castanho; Torrico-Bascope, Grover Victor; Seixas, Falcondes José Mendes
Fonte: Institute of Electrical and Electronics Engineers (IEEE) Publicador: Institute of Electrical and Electronics Engineers (IEEE)
Tipo: Artigo de Revista Científica Formato: 1565-1577
ENG
Relevância na Pesquisa
95.96%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); The need for solid-state ac-dc converters to improve power quality in terms of power factor correction, reduced total harmonic distortion at input ac mains, and precisely regulated dc output has motivated the investigation of several topologies based on classical converters such as buck, boost, and buck-boost converters. Boost converters operating in continuous-conduction mode have become particularly popular because reduced electromagnetic interference levels result from their utilization. Within this context, this paper introduces a bridgeless boost converter based on a three-state switching cell (3SSC), whose distinct advantages are reduced conduction losses with the use of magnetic elements with minimized size, weight, and volume. The approach also employs the principle of interleaved converters, as it can be extended to a generic number of legs per winding of the autotrans-formers and high power levels. A literature review of boost converters based on the 3SSC is initially presented so that key aspects are identified. The theoretical analysis of the proposed converter is then developed...

Analysis and design of constant-frequency peak-current-controlled high-power-factor boost rectifier with slope compensation

Canesin, Carlos A.; Barbi, Ivo
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 807-813
ENG
Relevância na Pesquisa
75.88%
This paper presents the analysis and the design of a peak-current-controlled high-power-factor boost rectifier, with slope compensation, operating at constant frequency. The input current shaping is achieved, with continuous inductor current mode, with no multiplier to generate a current reference. The resulting overall circuitry is very simple, in comparison with the average-current-controlled boost rectifier. Experimental results are presented, taken from a laboratory prototype rated at 370 W and operating at 67 kHz. The measured power factor was 0.99, with a input current THD equal to 5.6%, for an input voltage THD equal to 2.26%.

New 12kW three-phase 18-pulse high power factor AC-DC converter with regulated output voltage for rectifier units

de Seixas, Falcondes Jose Mendes; Barbi, Ivo
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 14-12
ENG
Relevância na Pesquisa
85.94%
This work presents a new high power factor three-phase rectifier based on a Y-connected differential autotransformer with reduced kVA and 18-pulse input current followed by three DC-DC boost converters. The topology provides a regulated output voltage and natural three-phase input power factor correction. The lowest input current harmonic components are the 17th and the 19th. Three boost converters, with constant input currents and regulated parallel connected output voltages are used to process 4kW each one. Analytical results from Fourier analyses of winding currents and the vector diagram of winding voltages are presented. Simulation results to verify the proposed concept and experimental results are shown in the paper.

An AC voltage regulator with high-power-factor, and control using a FPGA device

Dantas, Fausto Donizeti; Canesin, Carlos Alberto
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 1311-1316
ENG
Relevância na Pesquisa
75.85%
This paper presents the analysis, design, simulation, and experimental results for a high frequency high Power-Factor (PF) AC (Alternate Current) voltage regulator, using a Sepic converter as power stage. The control technique employed to impose a sinusoidal input current waveform, with low Total Harmonic Distortion (THD), is the sinusoidal variable hysteresis control. The control technique was implemented in a FPGA (Field Programmable Gate Array) device, using a Hardware Description Language (VHDL). Through the use of the proposed control technique, the AC voltage regulator performs active power-factor correction, and low THD in the input current, for linear and non-linear loads, satisfying the requirements of the EEC61000-3-2 standards. Experimental results from an example prototype, designed for 300W of nominal output power, 50kHz (switching frequency), and 127Vrms of nominal input and output voltages, are presented in order to validate the proposed AC regulator. © 2005 IEEE.

A true programmable HPF hybrid three-phase rectifier

Soares, Jurandir de O.; Canesin, Carlos A.; Freitas, Luiz C. de
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 3843-3849
ENG
Relevância na Pesquisa
66.05%
In this paper is proposed and analyzed a digital hysteresis modulation using a FPGA (Field Programmable Gate Array) device and VHDL (Hardware Description Language), applied at a hybrid three-phase rectifier with almost unitary input power factor, composed by parallel SEPIC controlled single-phase rectifiers connected to each leg of a standard 6-pulses uncontrolled diode rectifier. The digital control allows a programmable THD (Total Harmonic Distortion) at the input currents, and it makes possible that the power rating of the switching-mode converters, connected in parallel, can be a small fraction of the total average output power, in order to obtain a compact converter, reduced input current THD and almost unitary input power factor. The proposed digital control, using a FPGA device and VHDL, offers an important flexibility for the associated control technique, in order to obtain a programmable PFC (Power Factor Correction) hybrid three-phase rectifier, in agreement with the international standards (IEC, and IEEE), which impose limits for the THD of the AC (Alternate Current) line input currents. Finally, the proposed control strategy is verified through experimental results from an implemented prototype. ©2008 IEEE.

Bridgeless interleaved boost PFC converter with variable duty cycle control

E Silva, Luciano S.C.; De Seixas, Falcondes J.M.; De Brito, Moacyr A.G.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 397-402
ENG
Relevância na Pesquisa
65.99%
This paper proposes a bridgeless boost interleaved PFC (power factor correction) converter with variable duty cycle control. The application of bridgeless technique causes reduction of conduction losses, while the interleaving technique of converters cells allows division of efforts in semiconductor devices and reduction of weight and volume of the input EMI filter. The use of variable duty cycle control has the functions of regulating the output voltage and eliminating the low order harmonic components that appears in the input current of the common interleaved power factor converters working in Discontinuous Conduction Mode (DCM). The simulation results of the proposed converter presented high power factor and a good transient response in relation to the output voltage regulation in presence of high load variations and supply voltage variations. © 2011 IEEE.

Experimental evaluation of the bridgeless interleaved boost PFC converter

E Silva, Luciano S. C.; De Seixas, Falcondes J.M.; Oliveira, Priscila Da S.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência
ENG
Relevância na Pesquisa
65.95%
This paper presents theoretical evaluation and experimental results to the proposed bridgeless interleaved boost PFC (power factor correction) converter. The application of bridgeless technique causes reduction of conduction losses, while the interleaving technique of the converter cells allows division of the current stress in semiconductor devices and reduction of weight and volume of the input EMI filter. In each cell of the converter, the inductor current operates in discontinuous conduction mode (DCM), which eliminates turn-on switching losses and the effects of reverse recovery in semiconductors, increasing the efficiency of the converter. The experimental results show the power factor of 0.96 for employed voltage ratio and an efficiency of 95.2 % for nominal load conditions. © 2012 IEEE.

Técnica para correção do fator de potência e aumento da suportabilidade dos circuitos retificadores a afundamentos temporários de tensão; Technique for power factor correction and ride-through capability Improvement of rectifier circuits to voltage sags

Silva, Daniel Divino Rodrigues da
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Dissertação
POR
Relevância na Pesquisa
85.91%
Este trabalho apresenta uma nova proposta de controle para conversor boost operando como retificador de alto fator de potência, a qual permite priorizar o requisito de alto fator de potência, sob condição normal da rede, ou priorizar a regulação da tensão de saída diante de afundamentos de tensão. O controle implementado consiste na modificação das malhas de realimentação do circuito 3854. O sistema de monitoramento contém o microcontrolador LPC2138, que comanda a alteração das malhas do 3854 em função das condições de operação da rede elétrica. A proposta supracitada objetiva a concepção de um conversor boost PFC – “Power Factor Correction” com maior suportabilidade perante os afundamentos de tensão de elevada ordem. São apresentados resultados experimentais de um protótipo submetido a estes distúrbios, os quais contemplam a comparação da performance do sistema proposto com a de um conversor PFC convencional. _________________________________________________________________________________ ABSTRACT; This work presents a new approach for PFC boost converter controller, which sets the priority of the controller to high power factor, under normal utility condition, or output voltage regulation, under sag condition. The new controller is based on modification of chip 3854 feedback loop. The monitoring system has a LPC2138 microcontroller that modifies the 3854 feedback loop depending of the energy network condition. This proposal conceives a ride-through capability improvement of PFC boost converters to hard voltage sags. Experimental results under normal and sag conditions are shown. Through these results it is possible to compare the performance between the proposed system and the ordinary PFC converter.; Dissertação (mestrado)-Universidade Federal de Uberlândia...

Um novo retificador híbrido multipulsos sem a utilização de transformadores defasadores e/ou transformadores de interfase; A new hybrid multipulse rectifier without using phaseshifting transformers or inter-phase transformers

Freitas, Luiz Carlos Gomes de
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Tese de Doutorado
POR
Relevância na Pesquisa
66.01%
Recentemente, no intuito de se melhorar a qualidade dos sistemas de distribuição de energia elétrica e atender às especificações impostas por normas internacionais, tem-se dedicado uma atenção especial ao desenvolvimento de melhores estruturas de conversores CA-CC ou simplesmente retificadores. Os retificadores trifásicos a diodo ou retificadores trifásicos não-controlados são as estruturas mais comuns e amplamente utilizadas na indústria e no meio rural, viabilizando um estágio CC intermediário para a conexão de outros circuitos eletrônicos. Entretanto, essas estruturas não atendem às restrições impostas por normas internacionais como por exemplo as IEC 61000-3-4 e a IEEE 519-1992. Nesse sentido, filtros passivos bastante caros e pesados, estruturas complexas de correção do fator de potência ou filtros ativos têm que ser instalados para mitigar a inerente distorção harmônica de corrente presente na rede CA de alimentação, devido a conexão desses equipamentos. Assim, nos últimos anos, têm-se observado um grande interesse por parte dos pesquisadores que atuam na área de eletrônica de potência em desenvolver novas estruturas de conversores CA-CC capazes de reduzir a distorção harmônica da corrente drenada da rede CA de distribuição e...

Estudo e concepção de retificadores a três níveis com alto fator de potência utilizando técnicas de comutação não dissipativas; Study and implementation of high power factor three-level rectifiers employing soft switching techniques

Tofoli, Fernando Lessa
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Tese de Doutorado
POR
Relevância na Pesquisa
75.8%
Esta tese propõe o estudo dos retificadores monofásico e trifásico a três níveis operando com fator de potência unitário. Através da análise de diversos trabalhos existentes na literatura, pode-se atribuir a estas estruturas as características de baixas perdas por condução, utilização de um menor número de componentes e conteúdo harmônico reduzido da corrente de entrada. Inicialmente, estas topologias são estudadas de forma a determinar as respectivas condições de operação e definir a metodologia de projeto dos estágios de potência e controle. Com o intuito de minimizar as perdas por comutação em tais conversores, propõe-se uma célula de comutação suave utilizando apenas elementos passivos como indutores, capacitores e diodos. Por fim, apresenta-se resultados analíticos que possibilitam a investigação do desempenho dos retificadores, no intuito de promover discussões técnicas do tema em questão. ______________________________________________________________________________ ABSTRACT; This thesis proposes the study of single-phase and three-phase three-level rectifiers operating with unity power factor. By the investigation of several works in the literature, prominent characteristics such as minimized conduction losses...

Universal digital controller for boost CCM power factor correction stages based on current rebuilding concept

López-Martín, Víctor M.; Azcondo, Francisco Javier; Castro, Ángel de; Zane, Regan A.
Fonte: IEEE Publicador: IEEE
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
65.97%
Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. V. M. López, F. J. Azcondo, A. de Castro, R. Zane, "Universal Digital Controller for Boost CCM Power Factor Correction Stages Based on Current Rebuilding Concept", IEEE Transactions on Power Electronics, vol. 29, no. 7, pp. 3818 - 3829, July 2014.; Continuous conduction mode power factor correction (PFC) without input current measurement is a step forward with respect to previously proposed PFC digital controllers. Inductor volt-second (vsL) measurement in each switching period enables digital estimation of the input current; however, an accurate compensation of the small errors in the measured vsL is required for the estimation to match the actual current. Otherwise, they are accumulated every switching period over the half-line cycle, leading to an appreciable current distortion. A vsL estimation method is proposed, measuring the input (vg) and output voltage (vo). Discontinuous conduction mode (DCM) occurs near input line zero crossings and is detected by measuring the drain-to-source MOSFET voltage vds. Parasitic elements cause a small difference between the estimated voltage across the inductor based on input and output voltage measurements and the actual one...

Corrección de factor de potencia basada en la estimación digital de la corriente de línea : aplicación en el convertidor Boost en modo de conducción continua; Digital power factor correction based on line-current estimation : CCM Boost converter application : Tesis doctoral

López Martín, Víctor Manuel
Fonte: Universidade de Cantabria Publicador: Universidade de Cantabria
Tipo: Tese de Doutorado
ENG
Relevância na Pesquisa
96%
RESUMEN: En esta tesis se presenta un controlador digital universal de corrección de factor de potencia basado en la estimación digital de la corriente de entrada. En dicha estimación se tiene en cuenta todas las fuentes de error en la estimación de la corriente debido a la implementación real del estimador, que introducen una diferencia entre la tensión medida en la inductancia y la real (tanto en términosde voltios como en términos de tiempo). Para compensar esta desviación. Una compensación feedforward para compensar errores con la variable tiempo, y un lazo de realimentación digital feedback que cancela la diferencia de tiempos el modo de conducción discontinua (MCD) de la corriente real de entrada (TgDCM) y de la corriente digital reconstruida (TrebDCM). Se presenta además una modificación en el control no-lineal de corrección de factor de potencia (NLC), para asegurar una corriente sinusoidal ante tensiones de red distorsionadas. Los resultados experimentales, obtenidos con un Boost PFC bajo diferentes condiciones muestran el comportamiento del control propuesto.; ABSTRACT: Continuous conduction mode (CCM) power factor correction (PFC) without input current measurement is a step forward with respect to previously proposed PFC digital controllers. Inductor volt-second (vsL) measurement in each switching period enables the digital estimation of the input current...

High power factor light-emitting diode driver on digital signal processor without electrolytic capacitor for high-power lighting

Chen, Y.; Zhou, J.; Hu, E.
Fonte: Taylor and Francis Publicador: Taylor and Francis
Tipo: Artigo de Revista Científica
Publicado em //2015 EN
Relevância na Pesquisa
75.89%
Electrolytic capacitor is a key factor that limits the life-time of the driver in a high-power light-emitting diode (LED) lighting. This article presents a high-power LED lighting driver on a digital signal processor without an electrolytic capacitor. The driver is composed of three stage circuits. The first stage is the boost power factor correction converter to achieve a high power factor. As it does not use an electrolytic capacitor, the output voltage ripple is larger, which directly affects the overall performance of the LED driver. Consequently, it must be optimized through the second and third stages. The second stage is the two-output LLC (Double inductance and capacitance) resonant converter, which is driven by a digital signal processor. This stage provides galvanic isolation and reduces voltage. The third stage is the two-input buck converter based on digital signal processor control that reduces the low-frequency ripple generated from the first two stages. Moreover, the regulation of each LED string current is achieved at this stage. The simulation and experimental results show that this LED lighting driver can achieve a high power factor and good constant current characteristics.; Yong Chen, Jun Zhou and Eric Hu; Published online: 20 Nov 2014

Pre-calculated duty cycle control implemented in FPGA for power factor correction

García Ávila Fernández, Alejandro; Castro, Ángel de; Muñoz García, Óscar; Azcondo, Francisco Javier
Fonte: Institute of Electrical and Electronics Engineers Publicador: Institute of Electrical and Electronics Engineers
Tipo: conferenceObject; bookPart
ENG
Relevância na Pesquisa
65.97%
Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. A. García Ávila Fernández, Á de Castro, Ó. Muñoz García, and F. J. Azcondo, "Pre-calculated duty cycle control implemented in FPGA for power factor correction", 35th Annual Conference of IEEE Industrial Electronics, 2009. IECON '09, Porto (Portugal), 2009, pp. 2955 - 2960; A power factor correction (PFC) technique based on pre-calculated duty cycle values is presented in this paper. In this method the duty ratios for half a line period are calculated in advance and stored in a memory. By synchronizing the memory with the line, near unity power factors can be achieved in a specific operating point. The main advantage of this technique is that neither current measurement nor current loop are needed. To obtain stable output voltages a voltage loop is included. A boost converter prototype controlled by an FPGA evaluation board has been implemented in order to verify the functionality of the proposed method. Both the simulation and experimental results show that near unity power factor can be achieved with this PFC strategy.

Analysis and Design of High Power Factor LED Drivers without Electrolytic Capacitor

Hao, Ting
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
EN; EN
Relevância na Pesquisa
75.87%
With superior longevity, approximately 5 times that of compact fluorescents (CFLs), and high efficacy, around 1.5 times that of CFLs, LEDs are now attracting vast attention from both academic and industrial sectors. Unfortunately, current power supply drivers for LEDs have the following drawbacks: (1) for a two-stage configuration, the power factor correction (PFC) circuit can help LEDs achieve good operating performance but contain too many components and are large in size, have low efficiency and relatively high cost; (2) a single-stage configuration can perform well in PFC and efficiency, however reliability issues occur due to the use of the electrolytic capacitor. In this thesis, the theoretical analysis and implementation of two high power factor, soft-switched, electrolytic-capacitor-less LED drivers are presented. The two drivers solve the aforementioned issues while minimizing its size and cost. The detailed theoretical analysis illustrates the advantages of the presented circuits and provides insight into their design and operation. The simulated and experimental implementations verified the performance of both circuits, which achieve a high power factor, indicating that the drivers have good operating performance. Elimination of the electrolytic capacitors improves the LED drivers’ reliability. In addition...

SINGLE STAGE POWER FACTOR CORRECTED THREE-LEVEL RESONANT CONVERTERS

Agamy, Mohammed S.
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado Formato: 7595333 bytes; application/pdf
EN; EN
Relevância na Pesquisa
85.93%
In this thesis, a new approach for single-stage power factor correction converters is proposed to increase their power ratings to be in the multiple kilowatts levels. The proposed techniques are based on the utilization of modified three-level resonant converter topologies. These topologies provide low component stresses, high frequency operation, zero voltage switching, applicability under a wide range of input and output conditions as well as added control flexibility. The proposed control algorithms are based on a combination of variable frequency and asymmetrical pulse width modulation control or variable frequency and phase shift modulation control. In either case, the variable frequency control is used to tightly regulate the output voltage, whereas, pulse width or phase shift modulation is used to regulate the dc-bus voltage as well as the input power factor. New converter topologies, their operation and steady state and dynamic analyses are presented in details. A modelling approach based on average multiple frequency methods is also proposed. This approach leads to the development of a full order state space model with the two control variables explicitly separated allowing a better controller design. The model can be used either at high level of detail expressing the non-linearities of the system or it can readily be simplified to a linear decoupled model for approximate solutions. Finally...

Analysis of power factor correction converters

Yeh, Thomas
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
76.09%
Power Converter with capacitive input filter is a non-linear load to the Utility AC power lines. There are widely used as Switch-Mode Power Supplies in office equipment applications ranging from Personal Computers to Office Printers and Copiers. The distorted input current waveform extracted by the capacitive input filter of the power converters produces unwanted harmonics which propagates to other line powered equipments. The harmonic pollutes the AC lines and interferes with the operations of sensitive line powered equipments. The distorted current waveform also leads to inefficient utilization of the available power from the AC outlet. This is because the AC line power is transferred to the load only when each frequency component of the line voltage is an in-phase, scaler related quantity with respect to the same frequency component of the extracted current. The problems of poor power factor and harmonic distortion are compounded by the proliferation of Switch-Mode power supplies and the situation is rapidly becoming intolerable. The problem of poor quality input current waveform can be described by two quantitative measurements: Power Factor (pf) and Total Harmonic Distortion (thd). Two general approaches are available to remedy the problem. One approach is to install passive filter networks between the Utility AC lines and the capacitive input filter. The second approach is to design active power processors as dedicated Power Factor Correction (pfc) Converters and installed as the front end to the capacitive input filter to shape the distorted current waveform into waveforms which will yield higher power factor. This Thesis first introduce the general concept of PF and harmonic distortion in Chapter 1. Chapter 2 derive the mathematical description of pf based on the concept of real power (pR) and apparent power {pA). Both sinusoidal and nonsinusoidal cases are studied. For comparison and completeness...

Digitally Controlled Integrated Electronic Ballast with Dimming and Power Factor Correction Features

Aguilar-Castillo,C.; García-Beltrán,C.D.; Morcillo-Herrera,C.
Fonte: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico Publicador: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2010 EN
Relevância na Pesquisa
96.02%
This paper presents a digitally controlled integrated electronic ballast with dimming and power factor correction features. The control circuit is based on a low-cost PIC16C71 microcontroller where the different strategies for energy saving have been implemented. The ballast is operating in closed loop achieving tight lamp current regulation through a digital Proportional-Integral algorithm. The integrated power stage is based on a frequency-controlled single-switch boost rectifier plus a half-bridge series resonant parallel loaded inverter sharing one power switch. The single-switch boost rectifier works in discontinuous inductor current mode with automatic power factor correction. Detailed analysis of the power stages and experimental results using 42-watt electronic ballast are presented.