EPE Association: NORpie 2000 - Topic 10: EMI AND POWER FACTOR CORRECTION

NORpie 2000 - Topic 10: EMI AND POWER FACTOR CORRECTION
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2000 > NORpie 2000 - Topic 10: EMI AND POWER FACTOR CORRECTION

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   Advantages of using Two-Switch Forward in Single-Stage Power Factor Corrected Power Supplies
By L. Petersen [View]
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Abstract: A single-Stage power factor corrected power supply using a two-switch forward is proposed to increase efficiency. The converter is operated in the DCM (Discontinues Conduction Mode) and it will be shown that this operation mode insures the intermediate DC-bus to be controlled only by means of circuit parameters and therefore independent of load variations. The DCM operation often has a diminishing effect on the efficiency but it will be shown that high efficiency with minimum circuit complexity can be achieved in this mode. A 500W 70V prototype of the two-switch Boost-Forward PFC power supply has been implemented. The measured efficiency is between 85% and 88.5% in the range 30W-500W and the measured power factor at full load is 0.95.

   Conducted Emissions of a Boost Converter with Low-Ripple Input Current for Power Factor Correction
By J. Wallius; V. Grigore; V. Tuomainen; J. Kyyrä [View]
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Abstract: Boost-based topologies are very popular for power factor correction. Conventional Boost converter can have relatively high switching frequency ripple in the input current. The ripple contributes to the conducted EMIemissions. This paper presents an advanced, low-ripple Boost topology. Experimental results show that this solution reduces conducted emissions of a Boost converter.

   Simulation Results of a Current Mode Controlled BIFRED
By Vesa Tuomainen; Vlad Grigore; Juha Wallius; Jorma Kyyrä [View]
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Abstract: BIFRED, Boost Integrated with Flyback Recitifier/Energy storage/Dc-dc converter, is a widely known single-stage converter. BIFRED is able to produce a regulated output voltage and a sinusoidal input current. These two properties combined in a low cost topology make it attractive alternative for a power factor corrected power supply in the future. However, BIFRED has one undesirable effect. Output voltage of BIFRED has a troublesome 100 Hz voltage ripple. One solution to remove the ripple is a peak current mode control. Simulation results from a peak current mode controlled BIFRED are presented in the paper. Simulation results show that the 100 Hz ripple can be removed from the output voltage by the control method.

   Average Current Control of a Buck+Boost PFC Rectifier for Low Cost Motor Drives
By Gert Karmisholt Andersen [View]
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Abstract: This paper analyses a two switch buck+boost Power-Factor-Correction (pfc) rectier used in a low cost Pulse- Amplitude-Modulated (PAM) induction motor drive. Emphasis is placed on the control structure of the current shaping loop of the rectier part of the motor drive. The buck+boost converter operates either as a buck converter or as a boost converter. By introducing simple feed forward of duty cycles and introducing online gain scheduling, only one current shaping controller with constant controller parameters is needed in both converter op- erating modes. These modications decrease the demands to the current controller signicantly and they yield better current shaping performance than a conventional current control. This new control structure is simple and easy to implement in a low cost motor drive. The analysis is performed analytical and is documented by simulations.

NORpie 2000 - Topic 10: EMI AND POWER FACTOR CORRECTION
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2000 > NORpie 2000 - Topic 10: EMI AND POWER FACTOR CORRECTION
	[return to parent folder]

	Advantages of using Two-Switch Forward in Single-Stage Power Factor Corrected Power Supplies By L. Petersen	[View] [Download]
Abstract: A single-Stage power factor corrected power supply using a two-switch forward is proposed to increase efficiency. The converter is operated in the DCM (Discontinues Conduction Mode) and it will be shown that this operation mode insures the intermediate DC-bus to be controlled only by means of circuit parameters and therefore independent of load variations. The DCM operation often has a diminishing effect on the efficiency but it will be shown that high efficiency with minimum circuit complexity can be achieved in this mode. A 500W 70V prototype of the two-switch Boost-Forward PFC power supply has been implemented. The measured efficiency is between 85% and 88.5% in the range 30W-500W and the measured power factor at full load is 0.95.

	Conducted Emissions of a Boost Converter with Low-Ripple Input Current for Power Factor Correction By J. Wallius; V. Grigore; V. Tuomainen; J. Kyyrä	[View] [Download]
Abstract: Boost-based topologies are very popular for power factor correction. Conventional Boost converter can have relatively high switching frequency ripple in the input current. The ripple contributes to the conducted EMIemissions. This paper presents an advanced, low-ripple Boost topology. Experimental results show that this solution reduces conducted emissions of a Boost converter.

	Simulation Results of a Current Mode Controlled BIFRED By Vesa Tuomainen; Vlad Grigore; Juha Wallius; Jorma Kyyrä	[View] [Download]
Abstract: BIFRED, Boost Integrated with Flyback Recitifier/Energy storage/Dc-dc converter, is a widely known single-stage converter. BIFRED is able to produce a regulated output voltage and a sinusoidal input current. These two properties combined in a low cost topology make it attractive alternative for a power factor corrected power supply in the future. However, BIFRED has one undesirable effect. Output voltage of BIFRED has a troublesome 100 Hz voltage ripple. One solution to remove the ripple is a peak current mode control. Simulation results from a peak current mode controlled BIFRED are presented in the paper. Simulation results show that the 100 Hz ripple can be removed from the output voltage by the control method.

	Average Current Control of a Buck+Boost PFC Rectifier for Low Cost Motor Drives By Gert Karmisholt Andersen	[View] [Download]
Abstract: This paper analyses a two switch buck+boost Power-Factor-Correction (pfc) rectier used in a low cost Pulse- Amplitude-Modulated (PAM) induction motor drive. Emphasis is placed on the control structure of the current shaping loop of the rectier part of the motor drive. The buck+boost converter operates either as a buck converter or as a boost converter. By introducing simple feed forward of duty cycles and introducing online gain scheduling, only one current shaping controller with constant controller parameters is needed in both converter op- erating modes. These modications decrease the demands to the current controller signicantly and they yield better current shaping performance than a conventional current control. This new control structure is simple and easy to implement in a low cost motor drive. The analysis is performed analytical and is documented by simulations.