Examination of the frequency modulation and lifting techniques for the generalized power factor correction switched‐capacitor resonant converter

Law, K.K.; Cheng, Ka Wai Eric

doi:10.1002/cta.462

Cited by 28 publications

(25 citation statements)

References 20 publications

(47 reference statements)

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“…Active PFC circuits: The boost or buck-boost topology with integrated control circuit is usually adopted [3][4][5], it can reach 99% power factor and eliminates most of the harmonics. However, it causes high voltage and current stress to the switching devices.…”

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confidence: 99%

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

Lee¹,

Hsiao²

2008

Circuit Theory & Apps

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SUMMARYIn this paper, a PWM method to improve the lamp current crest factor (CCF) of the valley-filled electronic ballast (VFEB) is presented. The VFEB has merits of high power factor, simple structure, and low cost. However, it results in an excessive CCF, which will shorten the lifetime of low-pressure discharge lamp. The proposed method controls switching duty ratio by feeding forward the dc-link voltage waveform of VFEB. It decreased the duty ratio with rising of dc-link voltage. Therefore, the proposed method could restrain the lamp peak current and improve the lamp CCF. The control block diagram and basic theory are introduced to improve the CCF. The computer simulations verify the proposed method and derive a minimum lamp CCF. The experimental results demonstrate that the lamp CCF was reduced from 1.9 to 1.58, the ac line power factor is 96%, and the input current THD is 29.3%. The fixed switching frequency operation gains a satisfactory power quality.

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confidence: 99%

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

Lee¹,

Hsiao²

2008

Circuit Theory & Apps

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“…The basic principle for switched capacitors is known as ampere-second balance [19], [20]. It can be simply described as that the amounts of charge flowing into and out of the capacitor must be the same during one switching cycle.…”

Section: B Current Balancing and Regulationmentioning

confidence: 99%

Single-Switch Multichannel Current-Balancing LED Drive Circuits Based on Optimized SC Techniques

Cheng

Lin

et al. 2015

IEEE Trans. Ind. Electron.

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By combining the conventional switched-mode power converters with advanced switched capacitor (SC) techniques, a plurality of single-switch current-balancing circuits are developed to drive multiple LED strings in this paper. Compared with the existing current-balancing LED drivers, the proposed drive circuits exhibit their attractive advantages in size and cost efficiency because just one active switch and one magnetic device are required. LED strings' current can be regulated by controlling the duty ratio of the switch in pulse width modulation (PWM) mode. Both advanced resonant and non-resonant SC methods are introduced to optimize the performance of the proposed LED drivers. The feasibility and theoretical analysis are verified with a 9W dual-channel non-isolated prototype and a 25W four-channel isolated prototype.

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“…Other power electronic topology such as switched-capacitor based converter [22,23] is also useful for TE applications because of high power density and simple control. As shown in Figure 3, the electrical characteristics depend on whether the switch is turned on or off.…”

Section: Control and Electrical Model Of Te Boardmentioning

confidence: 99%

The Thermoelectric Analysis of Different Heat Flux Conduction Materials for Power Generation Board

Lam

Cheng

2017

Energies

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Abstract:The development of the thermoelectric (TE) power generation is rapid, and the applications have extensively been studied. The principle is based on the Seebeck effect, in which the temperature difference between hot and cold sides of the TE material converts to electrical energy. In this paper, a design is proposed to convert the thermal energy between indoor and outdoor of a board to electrical energy by the thermoelectric generator (TEG). Furthermore, the electrical energy generated is charged to supercapacitors as a battery or a power supply to the loads (e.g., lights) of the house. Besides the experimental work, a thermal model and an electrical model of the TEG have been proposed. To study the power generation performance in terms of materials, the simulation of the conversion efficiency of the TE board using materials with different thermal conductance have also been conducted. It was found that, using graphene as the thermally conductive material, the conversion efficiency was enhanced by 1.6% and 1.7%, when the temperature difference was 15 • C and 40 • C, respectively.

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Examination of the frequency modulation and lifting techniques for the generalized power factor correction switched‐capacitor resonant converter

Cited by 28 publications

References 20 publications

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

A simple PWM method for improving lamp current crest factor of valley‐filled electronic ballast

Single-Switch Multichannel Current-Balancing LED Drive Circuits Based on Optimized SC Techniques

The Thermoelectric Analysis of Different Heat Flux Conduction Materials for Power Generation Board

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