A Continuous Conduction mode/Critical Conduction Mode Active Power Factor Correction Circuit with Input Voltage Sensor-less Control

Abstract An active power factor correction (PFC) circuit is presented which employs a newly proposed input voltage sensor-less control technique operated in continuous conduction mode (CCM) and critical conduction mode (CRM). The conventional PFC circuit with input voltage sensor-less control technique degrades the power factor (PF) under the light load condition due to DCM operation. In the proposed PFC circuit, the switching frequency is basically 70KHz in CCM operation. In light load condition, however, the PFC circuit operates in CRM and the switching frequency is increased up to 200KHz. So CCM/CRM operation of the PFC circuit alleviates the decreasing of the PF in light load condition. The proposed PFC controller IC has been implemented in a 0.35μm BCDMOS process and a 240W PFC prototype is built. Experimental results shows the PF of the proposed PFC circuit is improved up to 10% from the one employing the conventional CCM/DCM dual mode control technique. Also, the PF is improved up to 4% in the light load condition of the IEC 61000-3-2 Class D specifications.
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http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/ieek/DHJJQ3/2013/v50n8/DHJJQ3_2013_v50n8_151.pdf

New Isolated Single-Phase AC-DC Converter for Universal Input Voltage Ming-Rong Lee*, Lung-Sheng Yang†, and Chia-Ching Lin*

New Isolated Single-Phase AC-DC Converter for Universal Input Voltage Ming-Rong Lee*, Lung-Sheng Yang†, and Chia-Ching Lin* *†Dept. of Electrical Engineering, Far East University, Tainan City, Taiwan Abstract This paper investigates a new isolated single-phase AC-DC converter, which integrates a modified AC-DC buck-boost converter with a DC-DC forward converter. The front semi-stage is operated in discontinuous conduction mode (DCM) to achieve an almost unity power factor and a low total harmonic distortion of the input current. The rear semi-stage is used for step-down voltage conversion and electrical isolation. The front semi-stage uses a coupled inductor with the same winding-turn in the primary and secondary sides, which is charged in series during the switch-on period and is discharged in parallel during the switch-off period. The discharging time can be shortened. In other words, the duty ratio can be extended. This semi-stage can be operated in a larger duty-ratio range than the conventional AC-DC buck-boost converter for DCM operation. Therefore, the proposed converter is suitable for universal input voltage (90~264 Vrms) and a wide output-power range. Moreover, the voltage stress on the DC-link capacitor is low. Finally, a prototype circuit is implemented to verify the performance of the proposed converter.
 LINK
http://jpe.or.kr/archives/view_articles.asp?seq=760

A Controller Design for a Stability Improvement of an On-Board Battery Charger Hae-Gwang Jeong* and Kyo-Beum Lee†

A Controller Design for a Stability Improvement of an On-Board
Battery Charger
Hae-Gwang Jeong* and Kyo-Beum Lee†
Corresponding Author: Department of Electrical and Computer
Engineering, Ajou University, Suwon, Korea. (kyl@ajou.ac.kr)
* Dept. of Electrical and Computer Engineering, Ajou University,
Suwon, Korea. (lite88@ajou.ac.kr)
Received: May 27, 2013; Accepted: June 7, 2013

Abstract – This paper proposes the controller design for a stability improvement of an on-board
battery charger. The system is comprised of a power factor correction (PFC) circuit and phase shift
full-bridge DC-DC converter. The PFC circuit performs the control of the DC-link voltage and the
input power factor. The DC-DC converter regulates the voltage and the current in the battery using the
DC-link voltage. This paper proposes the design method of PI controller for the PFC circuit using a
small signal model. The analysis and design of a type-three controller for the DC-DC converter is also
presented. A simulation and experiment has been performed on the on-board battery charger and their
results are presented to verify the validity of the proposed system.
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http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=E1EEFQ_2013_v8n4_951

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ANÁLISE COMPARATIVA DE CONVERSORES MONOFÁSICOSAPLICADOS À CORREÇÃO DE FATOR DE POTÊNCIA

ABSTRACT
Master Dissertation

Programa de Pós-Graduação em Engenharia Elétrica
Universidade Federal de Santa Maria
ANÁLISE COMPARATIVA DE CONVERSORES MONOFÁSICOS
APLICADOS À CORREÇÃO DE FATOR DE POTÊNCIA
AUTHOR: ENG. FERNANDO BELTRAME
RESEARCH SUPERVISOR: DR. ENG. JOSÉ RENES PINHEIRO
Santa Maria, August 12th, 2009.
This work presents a study and a comparative analysis of high power single-phase
converter applied to power factor correction in according to the international standards IEC
61000-3-4 (harmonics limitation) and CISPR 22 (electromagnetic interference limitation) for
high power applications. The converters studied were the conventional boost converter, the
interleaved boost converter, with two cell operating with a delay angle of 180º between each
other, and the dual boost converter. Such converters are used in front-end modules of
information technology equipment. All converters have the same input and output voltage and
the same input current. The converters were projected to provide the same total input
harmonic distortion (THD), with the idea of using the same input filter. Implementation of the
control laws was performed through a digital control with the use of a 16 bits microcontroller.
All converters were, first of all, studied and presented in this dissertation. The
analyzed parameters for comparison were: power factor, total harmonic distortion (THD),
semiconductor losses and magnetic losses, heat-sinks volume and magnetics volume,
conducted electromagnetic interference, performance and costs.

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http://www.ufsm.br/ppgee/docs/Dissetacao_Fernando_Beltrame.pdf

Power Modules for Active Power Factor Correction

Vincotech is pleased to announce the release of new products, specifically designed for active power factor correction (PFC).