CCM Operation of a Single-Stage Boost-Flyback Converter with Active-Clamp for LED Driver Applications

Esfandani, M.Janbeygloo; Feizi, Mohsen; Beiranvand, Reza

doi:10.1109/pedstc49159.2020.9088460

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…(4) The FC and the ALFCRSU are independent of each other in terms of operation timing, so they can be analyzed separately. ; (5) The switches are regarded as ideal. (6) The inductor L1, the coupled inductor T1, and the capacitors Co and C1 are not considered for their parasitic resistance.…”

Section: Analysis Of the Proposed Circuitmentioning

confidence: 99%

“…In [5], the same switch is used to integrate a boost converter and a flyback converter into a single-stage converter, which relies on the energy storage capacitor between the two converters to decouple the low-frequency components and is able to recover the leakage current to improve efficiency. However, the drawback is that the energy still needs to be converted twice, which will increase the loss, and the experimental waveform shows a lack of ripple cancellation capability to some extent.…”

Section: Introductionmentioning

confidence: 99%

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Universal Input Single-Stage High-Power-Factor LED Driver with Active Low-Frequency Current Ripple Suppressed

Hwu,

Shieh,

Lin

2023

Energies

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In this paper, a light-emitting diode (LED) driver with a high power factor (PF) and low-frequency current ripple suppression over a wide input range is presented, and a flyback converter is designed to operate in the discontinuous conduction mode (DCM), with a digital controller used to keep the duty cycle constant for half of the utility cycle under a fixed load and input voltage. This method ensures that the input current is in phase with the universal input voltage, thus achieving a high power factor without utilizing feedforward control. Furthermore, on the secondary side, the time of the zero point of the utility voltage can be attained so that the duty cycle can be updated at this time. In addition, a simple auxiliary circuit is connected parallel to the output side to absorb the excess output current of the flyback converter or to release the current to the load to make up for the shortage of the output current of the flyback converter so that the low-frequency ripple of the output current can be inhibited. There are only two current-detecting resistors used in this study: one is the output current-sensing resistor of the flyback converter, and the other is the output current-sensing resistor of the auxiliary circuit.

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Section: Analysis Of the Proposed Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%