A family of PFC voltage regulator configurations with reduced redundant power processing

2003

Circuit Theory & Apps

SUMMARYThis paper discusses the circuit theory aspects of power factor correction in switching converter circuits. The discussion begins with an examination of the requirement of power factor correction in dc=dc converters. Using the concept of zero-order converter circuits, su cient conditions for a dc=dc converter circuit to provide power factor correction are derived. The duality principle is applied to generate new converter circuits that can achieve power factor correction. The practical application of power factor correction is considered in conjunction with the requirement of tight output voltage regulation. Detailed study of the circuit conÿguration that can simultaneously provide power factor correction and output regulation is given. Based on a general three-port model, the voltage regulator with power factor correction capability is studied in terms of the power ow between the input port, output port and energy storage port. A detailed consideration of the power ow among the three ports leads to the derivation of all possible minimal conÿgurations that can achieve power factor correction and voltage regulation. The e ciencies of these minimal conÿgurations are studied theoretically, leading to the concept of 'reduced redundant power processing' which provides important clue to e ciency improvement. Another issue addressed in this paper is the synthesis of practical circuits that can provide power factor correction and output regulation. In particular, four practical minimal conÿgurations that achieve reduced redundant power processing are considered. A systematic synthesis procedure is derived for creating converter circuits that achieve power factor correction and output voltage regulation. The control issue is also investigated in depth, pinpointing the basic requirement on the number of control parameters needed and its relationship with the operating mode.

Section: Acknowledgementsmentioning

confidence: 99%

Circuit theory of power factor correction in switching converters

2003

Circuit Theory & Apps

“…In fact, this category of switching regulators can be represented by several different power flow diagrams [18]. One of the power flow diagrams of this category is shown in Fig.…”

Section: Category 3 Pfc Switching Regulatorsmentioning

confidence: 99%

“…We begin with some descriptions of the non-cascading topologies in terms of simplified power flow diagrams [18]- [19]. Using these diagrams, we classify the PFC switching regulators of non-cascading structures into three categories, each of which has a different possibility of performance tradeoff.…”

Section: Introductionmentioning

confidence: 99%

Performance considerations of PFC switching regulators based on non-cascading structures

Cheung

Chow

2006 37th IEEE Power Electronics Specialists Conference

2006

Self Cite

Abstract-This paper discusses the characteristics of powerfactor-correction (PFC) switching regulators of non-cascading structures in terms of efficiency, input current harmonic distortion, and load transient response. The discussion begins with simplified power flow diagrams of the non-cascading PFC switching regulators and describes their essential features for achieving power factor correction and tight voltage regulation. Based on these diagrams, the various configurations of switching regulators can be classified into three categories, each offering a different possibility of performance tradeoffs. The first category permits tradeoff between efficiency and input current harmonic contents, the second permits tradeoff between efficiency and load transient response, and the third allows tradeoffs among all performance areas. The paper briefly reviews the non-cascading structures of PFC switching regulators in terms of the three categories. Simulation and experimental results are provided to illustrate the performance tradeoffs in these PFC switching regulators.

“…These noncascading PFC power supplies allow part of the input power to be processed by only one power stage, thereby reducing the amount of power redundantly processed by the two constituent power converters. A unified solution for generating the noncascading PFC power supplies based on the reduced redundant power processing (R 2 P 2 ) principle has been presented in Tse et al [11], [12]. While the basic theoretical considerations and circuit synthesis procedures were reported [11], [12], practical design considerations and evaluations for high power applications have not been addressed.…”

mentioning

confidence: 99%

“…A unified solution for generating the noncascading PFC power supplies based on the reduced redundant power processing (R 2 P 2 ) principle has been presented in Tse et al [11], [12]. While the basic theoretical considerations and circuit synthesis procedures were reported [11], [12], practical design considerations and evaluations for high power applications have not been addressed. In this paper, we consider the practical design and implementation of a specific noncascading power flow structure of PFC power supplies, which is shown in Fig.…”

mentioning

confidence: 99%

Practical Design and Evaluation of a 1 kW PFC Power Supply Based on Reduced Redundant Power Processing Principle

Cheung

Chow

IEEE Trans. Ind. Electron.

2008

Abstract-Using the reduced redundant power processing (R 2 P 2 ) principle, a single-phase power-factor correction (PFC) power supply can achieve a higher overall efficiency as a result of the use of a noncascading structure that involves less repeated processing of the input power. This paper investigates a single-phase noncascading PFC power supply based on the R 2 P 2 principle. The circuit employs a current-fed full-bridge converter as the PFC preregulator, and a buck-boost converter as the voltage regulator. This paper addresses the design of this noncascading PFC power supply and in particular the relationships between the gained efficiency, the transient response and the size of the energy storage. Experimental results obtained from a 1 kW laboratory prototype are presented.Index Terms-Buck-boost converter, continuous conduction mode (CCM), current-fed full-bridge converter, noncascading structure, power factor correction (PFC).