A novel method for elimination of line-current harmonics in single-stage PFC switching regulators

Chow, M.H.L.; Siu, K.W.; Tse, Chi Kong; Lee, Yim-Shu

doi:10.1109/63.654961

Cited by 45 publications

(31 citation statements)

References 6 publications

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“…Obviously, in practice, Operating Regime 2 has advantage over Operating Regime 3 because if one converter is not a ected by frequency variation, then frequency modulation can be used solely for controlling the other converter [21]. In short, we may state the results of our analysis of the control requirement of single-stage PFC voltage regulators as follows.…”

Section: Application To Single-stage Designmentioning

confidence: 99%

“…The forward converter is simply controlled by a conventional PWM scheme. Details of practical implementation and experimental results can be found in Chow et al [21].…”

Section: Application To Single-stage Designmentioning

confidence: 99%

“…Speciÿcally, the boost converter is made to operate in DM, whereas the forward converter is in CM. The control equation for the DM boost converter, as derived in Chow et al [21], is…”

Section: Application To Single-stage Designmentioning

confidence: 99%

“…The second solution, moreover, covers the single-stage design utilizing both duty cycle modulation and frequency modulation for achieving almost perfect PFC and fast regulation [21].…”

Section: Proofmentioning

confidence: 99%

“…Owing to the single-switch design, the combined use of duty cycle and switching frequency control is inevitable, as discussed previously. In Chow et al [21], the same converter is redesigned to employ Operating Regime 2 so as to immunize one converter against frequency variation. Hence, control can be easily achieved with one loop regulating the output via duty cycle modulation and another loop shaping the input current via frequency modulation.…”

Section: Application To Single-stage Designmentioning

confidence: 99%

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Circuit theory of power factor correction in switching converters

Tse

2003

Circuit Theory & Apps

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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.

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Section: Application To Single-stage Designmentioning

confidence: 99%

“…The forward converter is simply controlled by a conventional PWM scheme. Details of practical implementation and experimental results can be found in Chow et al [21].…”

Section: Application To Single-stage Designmentioning

confidence: 99%

“…Speciÿcally, the boost converter is made to operate in DM, whereas the forward converter is in CM. The control equation for the DM boost converter, as derived in Chow et al [21], is…”

Section: Application To Single-stage Designmentioning

confidence: 99%

“…The second solution, moreover, covers the single-stage design utilizing both duty cycle modulation and frequency modulation for achieving almost perfect PFC and fast regulation [21].…”

Section: Proofmentioning

confidence: 99%

Section: Application To Single-stage Designmentioning

confidence: 99%

See 3 more Smart Citations

Circuit theory of power factor correction in switching converters

Tse

2003

Circuit Theory & Apps

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Fast‐scale bifurcation in single‐stage PFC power supplies operating with DCM boost stage and CCM forward stage

Tse

Wong

et al. 2006

Circuit Theory & Apps

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SUMMARYThis paper describes the fast-scale bifurcation phenomena of a single-stage single-switch power-factorcorrection (PFC) regulator comprising a boost stage operating in discontinuous conduction mode (DCM) and a forward stage operating in continuous conduction mode (CCM). The two stages combine into a single stage by sharing one main switch and one control loop. Using 'exact' cycle-by-cycle computer simulations, the e ects of various circuit parameters on fast-scale instabilities are studied. The results are qualitatively veriÿed by experimental measurements. This work provides a clear picture of how the variation of certain practical parameters can render such a circuit fast-scale unstable.

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An overview of energy efficient solid state LED driver topologies

Yadlapalli

Narasipuram²,

Anuradha³

2019

Int J Energy Res

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LED lamps are projected as prospective successors of incandescent lamps with high efficiency and a long lifetime. Therefore, there is a need to develop energy efficient LED driver topologies for achieving constant current regulation, despite the effects of temperature on the LED V-I characteristics. This paper presents the salient features of various LED driver topologies with a focus on power density, multi-string operation, renewable energy utilization, soft switching, optical wireless communication, reliability and size. The performance of the above topologies is analysed in terms of the number of components, converter switching frequency, galvanic isolation, power rating and efficiency. This paper takes a look at efficiency improvement methods while dwelling on aspects of lifetime and reliability prediction of LED drivers. The paper will anticipate some of the future trends associated with the adaptation of wide bandgap power semiconductor materials, smart LED lighting for the internet of things (IoT) and programmable LED lamp drivers. This detailed technology review is extremely useful for researchers, designers and engineers in choosing the right topology.

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A novel method for elimination of line-current harmonics in single-stage PFC switching regulators

Cited by 45 publications

References 6 publications

Circuit theory of power factor correction in switching converters

Circuit theory of power factor correction in switching converters

Fast‐scale bifurcation in single‐stage PFC power supplies operating with DCM boost stage and CCM forward stage

An overview of energy efficient solid state LED driver topologies

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