EPE Association: EPE 2009 - Subtopic 14-6 - LS: 'Power Factor Correction'

EPE 2009 - Subtopic 14-6 - LS: 'Power Factor Correction'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 14: 'Electrical Energy Generating Systems, Renewable Energy Systems' > EPE 2009 - Subtopic 14-6 - LS: 'Power Factor Correction'

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   A Low-Cost Battery Charger with High Power Factor Correction Based on Standard Peak-Current Mode Integrated Controllers
By Diego G. LAMAR, Javier SEBASTIAN, Manuel ARIAS, Alberto RODRIGUEZ, Marta M. HERNANDO [View]
[Download]

Abstract: In the last few years, several low-cost Power Factor Correctors (PFC) control techniques operating in Continuous Conduction Mode (CCM) have been proposed in order to simplify the traditional control strategies based on an analog multiplier. This simplification makes sense in the case of relatively low-power and wide input voltage range applications. These techniques are focused in the Boost converter as a first stage of ac-dc power supplies. However, in some applications a PFC as a one-stage power supply can be used. This paper presents a new low cost control strategy suitable for Flyback family of converters (e.g., Buck-Boost, Flyback, SEPIC, Cuk and Zeta). The control is carried out by a low-cost standard IC controller for peak current-mode dc-dc converters. Neither analog multiplier nor input voltage sensor are needed to achieve quasi-sinusoidal line waveforms, which makes this method very attractive. In fact, this method is the application of the Linear Peak Current Mode Controller (LPCMC) to the Flyback family of converters. However, either it does not need the use of traditional two matched integrators or a current sensor with an integrator with reset for reducing the Total Harmonic Distortion (THD). In this case, the use of a simple exponential compensation ramp instead of linear one is the proposed solution for drawing a sinusoidal input current. Moreover, the line current is cycle-by-cycle controlled and, therefore, the input current feedback loop is extremely fast, which allows the use of this type of control with high frequency lines. An experimental prototype was developed as high Power Factor (PF) battery charger to verify the viability of the new control strategy.

   DCM Boost interleaved converter for operation in AC and DC to trolleybus application
By FLÃVIO GONÃ‡ALVES, Carlos alberto CANESIN, Guilherme MELO [View]
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Abstract: This paper is based on the development and experimental analysis of a DCM Boost interleaved converter suitable for application in traction systems of electrical vehicles pulled by electrical motors (Trolleybus), which are powered by urban DC or AC distribution networks. This front-end structure is capable of providing significant improvements in trolleybuses systems and in the urban distribution network costs, and efficiency. The architecture of proposed converter is composed by five boost power cells in interleaving connection, operating in discontinuous conduction mode. Furthermore, the converter can operate as AC-DC converter, or as DC-DC converter providing the proper DC output voltage range required by DC or AC adjustable speed drivers. Therefore, when supplied by single-phase AC distribution networks, and operating as AC-DC converter, it is capable to provide high power factor, reduced harmonic distortion in the input current, complying with the restrictions imposed by the IEC 61000-3-4 standards. The digital controller has been implemented using a low cost FPGA and developed totally using a hardware description language VHDL and fixed point arithmetic. Thus, two control strategies are evaluated considering the compliance with input current restrictions imposed by IEC 61000-3-4 standards, the regular PWM modulation and a current correction PWM modulation. In order to verify the feasibility and performance of the proposed system, experimental results from a 15 kW low power scale prototype are presented, operating in DC and AC conditions.

   Novel Control Strategy for Single-Phase to Three-Phase Power Converter Using an Active Buffer
By Yoshiya OHNUMA, JUNICHI ITOH [View]
[Download]

Abstract: A novel single-to-three-phase power converter that allows a smaller smoothing capacitor in the DC link is proposed. Large smoothing capacitors are conventionally required in such converters to absorb power ripple at twice the frequency of the power supply. The proposed topology consists of an indirect matrix converter and an active snubber to absorb the power ripple, and does not require a reactor or large smoothing capacitor. The fundamental operations of the proposed converter are confirmed through simulations and experiments.

EPE 2009 - Subtopic 14-6 - LS: 'Power Factor Correction'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 14: 'Electrical Energy Generating Systems, Renewable Energy Systems' > EPE 2009 - Subtopic 14-6 - LS: 'Power Factor Correction'
	[return to parent folder]

	A Low-Cost Battery Charger with High Power Factor Correction Based on Standard Peak-Current Mode Integrated Controllers By Diego G. LAMAR, Javier SEBASTIAN, Manuel ARIAS, Alberto RODRIGUEZ, Marta M. HERNANDO	[View] [Download]
Abstract: In the last few years, several low-cost Power Factor Correctors (PFC) control techniques operating in Continuous Conduction Mode (CCM) have been proposed in order to simplify the traditional control strategies based on an analog multiplier. This simplification makes sense in the case of relatively low-power and wide input voltage range applications. These techniques are focused in the Boost converter as a first stage of ac-dc power supplies. However, in some applications a PFC as a one-stage power supply can be used. This paper presents a new low cost control strategy suitable for Flyback family of converters (e.g., Buck-Boost, Flyback, SEPIC, Cuk and Zeta). The control is carried out by a low-cost standard IC controller for peak current-mode dc-dc converters. Neither analog multiplier nor input voltage sensor are needed to achieve quasi-sinusoidal line waveforms, which makes this method very attractive. In fact, this method is the application of the Linear Peak Current Mode Controller (LPCMC) to the Flyback family of converters. However, either it does not need the use of traditional two matched integrators or a current sensor with an integrator with reset for reducing the Total Harmonic Distortion (THD). In this case, the use of a simple exponential compensation ramp instead of linear one is the proposed solution for drawing a sinusoidal input current. Moreover, the line current is cycle-by-cycle controlled and, therefore, the input current feedback loop is extremely fast, which allows the use of this type of control with high frequency lines. An experimental prototype was developed as high Power Factor (PF) battery charger to verify the viability of the new control strategy.

	DCM Boost interleaved converter for operation in AC and DC to trolleybus application By FLÃVIO GONÃ‡ALVES, Carlos alberto CANESIN, Guilherme MELO	[View] [Download]
Abstract: This paper is based on the development and experimental analysis of a DCM Boost interleaved converter suitable for application in traction systems of electrical vehicles pulled by electrical motors (Trolleybus), which are powered by urban DC or AC distribution networks. This front-end structure is capable of providing significant improvements in trolleybuses systems and in the urban distribution network costs, and efficiency. The architecture of proposed converter is composed by five boost power cells in interleaving connection, operating in discontinuous conduction mode. Furthermore, the converter can operate as AC-DC converter, or as DC-DC converter providing the proper DC output voltage range required by DC or AC adjustable speed drivers. Therefore, when supplied by single-phase AC distribution networks, and operating as AC-DC converter, it is capable to provide high power factor, reduced harmonic distortion in the input current, complying with the restrictions imposed by the IEC 61000-3-4 standards. The digital controller has been implemented using a low cost FPGA and developed totally using a hardware description language VHDL and fixed point arithmetic. Thus, two control strategies are evaluated considering the compliance with input current restrictions imposed by IEC 61000-3-4 standards, the regular PWM modulation and a current correction PWM modulation. In order to verify the feasibility and performance of the proposed system, experimental results from a 15 kW low power scale prototype are presented, operating in DC and AC conditions.

	Novel Control Strategy for Single-Phase to Three-Phase Power Converter Using an Active Buffer By Yoshiya OHNUMA, JUNICHI ITOH	[View] [Download]
Abstract: A novel single-to-three-phase power converter that allows a smaller smoothing capacitor in the DC link is proposed. Large smoothing capacitors are conventionally required in such converters to absorb power ripple at twice the frequency of the power supply. The proposed topology consists of an indirect matrix converter and an active snubber to absorb the power ripple, and does not require a reactor or large smoothing capacitor. The fundamental operations of the proposed converter are confirmed through simulations and experiments.