EPE Association: EPE-PEMC 2000 - Topic 01d: PFC Converters

EPE-PEMC 2000 - Topic 01d: PFC Converters
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 01: Power Converters > EPE-PEMC 2000 - Topic 01d: PFC Converters

   [return to parent folder]

   An Integrated Single-Stage PFC AC to DC Converter with Reduced Switching Losses
By Kang F.S., Kim W., Park S., Kim Ch. [View]
[Download]

Abstract: In order to obtain sinusoidal, unity power factor input currents, an integrated zero-voltage switched single-stage power factor corrected AC/DC forward converter with semiautomatic current shaping is presented in this paper. This converter is combined a boost converter used as PFC with a forward converter used as DC to DC conversion into one power stage. As this converter is operated in discontinuous conduction mode, the peak of the input current will follow the input voltage without sensing of the input current from AC line. At the same time, due to zero-voltage switching, the switching losses can be considerably relieved. And to decrease the surge voltage at the secondary rectifiers, when switches are turned on or off, a simple auxiliary circuit is adopted into the proposed converter. Theoretical analysis and experimental results of a 1 [kW] converter with 110 [Vac] input voltage and 50 [Vdc] output voltages are presented.

   Boost Converter with Low-Ripple Input Current and Passive Lossless Snubber for Power Factor Correction
By Juha W., Vlad Grigore, Vesa Tuomainen, Jorma Kyyra [View]
[Download]

Abstract: A large number of Boost-based topologies has been introduced for power factor correction. These advanced topologies improve the efficiency and reduce EMI problems of the conventional Boost converter. This paper briefly describes two of these topologies: Boost with a lossless snubber [1] and Boost with a low-ripple input current [2]. These topologies were combined, and experimental results show significant improvement in efficiency. Conducted EMI measurements were also made and they show reduced differential mode interference.

   Dynamic and Steady State Analysis of a Three Phase Buck Rectifier
By Doval-Gandoy J., Castro C., Penalver C.M. [View]
[Download]

Abstract: Current Source Recifiers among other alternatives, offer several advantages over line conmutated rectifiers. Advantages include displacement power factor control and reduced line current harmonic distortion. This paper analyses the current source rectifier (CSR) in transient and steady state, the models are developed in a synchronous reference frame. The load behavior is characterized for two load conditions, resistive load, or in general, increasing current for increasing voltage, and constant output power, decreasing output current for increasing voltage. Constant power operation can occur for a converter system supplying a PWM inverter with high dynamics. Several static converter characteristics such as power factor and real and reactive power are analyzed for both types of load. Transient characteristics are analyzed for both types of load by exact small-signal model with full set of equations.

   High Performance Discontinuous-Mode Boost Converter with Unity Power Factor
By Taniguchi K., Morizane T. [View]
[Download]

Abstract: A boost converter is widely used for power factor correction (PFC). The discontinuous mode (DCM) converter eliminates the complicated circuit control requirement, reduces the number of components, and reduces the filter reactive components size. Analysis of an input current waveform of the DCM boost converter is described in this paper. As the result of analysis, components included in the input current waveform are fundamental and third harmonic, and other components can be neglected. Improving method of input current waveform is also proposed.

   Three-Phase High Power Factor Rectifier Applying a Novel Current Injection Network
By Pejoviæ P., Janda Ž. [View]
[Download]

Abstract: Two versions of a novel current injection network for low-harmonic rectifiers that apply the third harmonic current injection is proposed in this paper. The current injection networks require one inductor, two capacitors, and one 1:1 transformer with volt-ampere rating of only 0.16% of the input power. The transformer is introduced to provide control of harmonic components of the injected currents at even triples of the line frequency, resulting in significant reduction of the input current total harmonic distortion (THD). Dependence of the input current THD on the current injection network Q-factor is computed for both of the proposed current injection network versions. The THD is shown to be less than 5.125%. Analytically obtained results are experimentally verified.

EPE-PEMC 2000 - Topic 01d: PFC Converters
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 01: Power Converters > EPE-PEMC 2000 - Topic 01d: PFC Converters
	[return to parent folder]

	An Integrated Single-Stage PFC AC to DC Converter with Reduced Switching Losses By Kang F.S., Kim W., Park S., Kim Ch.	[View] [Download]
Abstract: In order to obtain sinusoidal, unity power factor input currents, an integrated zero-voltage switched single-stage power factor corrected AC/DC forward converter with semiautomatic current shaping is presented in this paper. This converter is combined a boost converter used as PFC with a forward converter used as DC to DC conversion into one power stage. As this converter is operated in discontinuous conduction mode, the peak of the input current will follow the input voltage without sensing of the input current from AC line. At the same time, due to zero-voltage switching, the switching losses can be considerably relieved. And to decrease the surge voltage at the secondary rectifiers, when switches are turned on or off, a simple auxiliary circuit is adopted into the proposed converter. Theoretical analysis and experimental results of a 1 [kW] converter with 110 [Vac] input voltage and 50 [Vdc] output voltages are presented.

	Boost Converter with Low-Ripple Input Current and Passive Lossless Snubber for Power Factor Correction By Juha W., Vlad Grigore, Vesa Tuomainen, Jorma Kyyra	[View] [Download]
Abstract: A large number of Boost-based topologies has been introduced for power factor correction. These advanced topologies improve the efficiency and reduce EMI problems of the conventional Boost converter. This paper briefly describes two of these topologies: Boost with a lossless snubber [1] and Boost with a low-ripple input current [2]. These topologies were combined, and experimental results show significant improvement in efficiency. Conducted EMI measurements were also made and they show reduced differential mode interference.

	Dynamic and Steady State Analysis of a Three Phase Buck Rectifier By Doval-Gandoy J., Castro C., Penalver C.M.	[View] [Download]
Abstract: Current Source Recifiers among other alternatives, offer several advantages over line conmutated rectifiers. Advantages include displacement power factor control and reduced line current harmonic distortion. This paper analyses the current source rectifier (CSR) in transient and steady state, the models are developed in a synchronous reference frame. The load behavior is characterized for two load conditions, resistive load, or in general, increasing current for increasing voltage, and constant output power, decreasing output current for increasing voltage. Constant power operation can occur for a converter system supplying a PWM inverter with high dynamics. Several static converter characteristics such as power factor and real and reactive power are analyzed for both types of load. Transient characteristics are analyzed for both types of load by exact small-signal model with full set of equations.

	High Performance Discontinuous-Mode Boost Converter with Unity Power Factor By Taniguchi K., Morizane T.	[View] [Download]
Abstract: A boost converter is widely used for power factor correction (PFC). The discontinuous mode (DCM) converter eliminates the complicated circuit control requirement, reduces the number of components, and reduces the filter reactive components size. Analysis of an input current waveform of the DCM boost converter is described in this paper. As the result of analysis, components included in the input current waveform are fundamental and third harmonic, and other components can be neglected. Improving method of input current waveform is also proposed.

	Three-Phase High Power Factor Rectifier Applying a Novel Current Injection Network By Pejoviæ P., Janda Ž.	[View] [Download]
Abstract: Two versions of a novel current injection network for low-harmonic rectifiers that apply the third harmonic current injection is proposed in this paper. The current injection networks require one inductor, two capacitors, and one 1:1 transformer with volt-ampere rating of only 0.16% of the input power. The transformer is introduced to provide control of harmonic components of the injected currents at even triples of the line frequency, resulting in significant reduction of the input current total harmonic distortion (THD). Dependence of the input current THD on the current injection network Q-factor is computed for both of the proposed current injection network versions. The THD is shown to be less than 5.125%. Analytically obtained results are experimentally verified.