Novel PFC ac-dc converter of high efficiency used in 2kW fire electric installation

Kwak, Dong-Kurl

doi:10.1587/elex.4.1

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The required EMI filter can also be reduced because of the reduced current ripple. To achieve unity power factor, a common topology composed of a EMI filter, a full-bridge diode rectifier and a DC converter operated in DCM was usually adopted for reducing the complexity of feedback controller [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Interleaved PFC balance charger with passive lossless snubber for series-connected batteries

Chen

et al. 2019

IEICE Electron. Express

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An interleaved balance charger for four series-connected batteries is proposed in this study. Each battery can be charged individually in the proposed charger for balance charging process. The charger is operated in the discontinuous conduction mode (DCM) for power factor correction (PFC). Two flyback and two buckboost converters are input parallel-connected and controlled with multi-phase interleaving technique. The input current ripple is then greatly reduced. Each flyback converter is used to convert the charging power from the grid to one corresponding battery. The two buckboost converters are output parallel-connected and followed by a dual output converter. Two batteries in the series-connected battery tank are charged by the dual output converter. Moreover, a passive lossless snubber is proposed to recover the leakage inductance energy in the flyback converters. A 500W prototype is constructed and corresponding experiments are carried out. From the experimental results, it can be seen that the efficiency is improved by about 3% compared with the topology with common RCD snubbers. The measured power factor of the proposed charger is higher than 0.976.

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Section: Introductionmentioning

confidence: 99%

Interleaved PFC balance charger with passive lossless snubber for series-connected batteries

Chen

et al. 2019

IEICE Electron. Express

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Novel bandgap-based under-voltage-lockout methods with high reliability

Zhao

Lai

2013

J. Semicond.

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Highly reliable bandgap-based under-voltage-lockout (UVLO) methods are presented in this paper. The proposed under-voltage state to signal conversion methods take full advantages of the high temperature stability characteristics and the enhancement low-voltage protection methods which protect the core circuit from error operation; moreover, a common-source stage amplifier method is introduced to expand the output voltage range. All of these methods are verified in a UVLO circuit fabricated with a 0.5 m standard BCD process technology. The experimental result shows that the proposed bandgap method exhibits a good temperature coefficient of 20 ppm/ ı C, which ensures that the UVLO keeps a stable output until the under-voltage state changes. Moreover, at room temperature, the high threshold voltage V THC generated by the UVLO is 12.3 V with maximum drift voltage of ˙80 mV, and the low threshold voltage V TH is 9.5 V with maximum drift voltage of ˙70 mV. Also, the low voltage protection method used in the circuit brings a high reliability when the supply voltage is very low.

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Novel PFC ac-dc converter of high efficiency used in 2kW fire electric installation

Cited by 2 publications

References 6 publications

Interleaved PFC balance charger with passive lossless snubber for series-connected batteries

Interleaved PFC balance charger with passive lossless snubber for series-connected batteries

Novel bandgap-based under-voltage-lockout methods with high reliability

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