Modeling of an active clamp discontinuous conduction mode flyback converter under variation of operating conditions

1999 ◽  
Author(s):  
C.T. Choi ◽  
C.K. Li ◽  
S.K. Kok
Keyword(s):  
Operating Conditions ◽  
Flyback Converter ◽  
Discontinuous Conduction Mode ◽  
Active Clamp ◽  
Conduction Mode

scholarly journals Paralel Flyback Converter sebagai PFC pada Lampu LED menggunakan Fuzzy Type-2

2021 ◽  
Vol 9 (4) ◽  
pp. 938
Author(s):  
MOH. ZAENAL EFENDI ◽  
DEWI KUSUMA WATI ◽  
LUCKY PRADIGTA SETIYA RAHARJA
Keyword(s):  
Power Factor ◽  
Power Factor Correction ◽  
Input Current ◽  
Voltage Source ◽  
Flyback Converter ◽  
Discontinuous Conduction Mode ◽  
Full Wave ◽  
Conduction Mode ◽  
Continuous Conduction Mode

ABSTRAKPeralatan elektronika umumnya memerlukan catu daya berupa sumber tegangan DC yang berasal dari sumber tegangan AC 220 V yang disearahkan menggunakan penyearah gelombang penuh. Pemasangan filter kapasitor pada sisi output penyearah menyebabkan bentuk gelombang arus masukan terdistorsi sehingga menimbulkan arus harmonisa yang mengakibatkan nilai faktor daya menjadi rendah. Artikel ini membahas mengenai paralel flyback konverter sebagai PFC (Power Factor Correction) pada lampu LED 36 V/60 W menggunakan algoritma fuzzy type-2. Flyback konverter pertama sebagai regulator tegangan DC bekerja dalam kondisi CCM (Continuous Conduction Mode). Flyback konverter kedua sebagai PFC bekerja dalam kondisi DCM (Discontinuous Conduction Mode) sehingga konverter bersifat resistif. Hasil simulasi menunjukkan bahwa paralel flyback konverter dapat memperbaiki faktor daya dari 0.597 menjadi 0.903 dan dapat menjaga tegangan keluaran konstan sebesar 36 V menggunakan algoritma fuzzy type-2 serta arus input yang dihasilkan memenuhi standar internasional hamonisa IEC61000-3-2 kelas C.Kata kunci: PFC, flyback konverter, IEC61000-3-2, lampu LED, fuzzy type-2 ABSTRACTElectronic equipment generally requires a DC voltage source that comes from a rectified 220 AC voltage source using full-wave rectifier. Installing capacitor filter on the output of rectifier makes the input current waveform becoming distorted that cause harmonic current which results in low power factor value. This article discusses parallel flyback converter as PFC (Power Factor Correction) on 36 V/60 W LED lamp using fuzzy type-2 algorithm. The first flyback converter as voltage dc regulator works in CCM (Continuous Conduction Mode). The second flyback converter as PFC works in DCM (Discontinuous Conduction Mode) to make the resistive converter. The simulation results shows the parallel flyback converter can improve the power factor from 0.597 to become 0.903 and can maintain a constant output voltage of 36 V using fuzzy type-2 algorithm and the input current meets the international harmonics standard of IEC61000-3-2 class C.Keywords: PFC, flyback converter, IEC61000-3-2, LED lamp, fuzzy type-2

scholarly journals Design and Implementation of a Single-Stage PFC Active-Clamp Flyback Converter with Dual Transformers

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2588
Author(s):  
Sen-Tung Wu ◽  
Yu-Ting Cheng
Keyword(s):  
Power Factor ◽  
Load Condition ◽  
Stage Structure ◽  
Single Stage ◽  
Switching Frequency ◽  
Conduction Loss ◽  
Discontinuous Conduction Mode ◽  
Active Clamp ◽  
Secondary Side ◽  
Conduction Mode

This paper proposes an AC/DC single-stage structure by integrating a boost topology and an active clamp flyback (ACF) circuit with power-factor-correction (PFC) function. The PFC function can be achieved by controlling a boost PFC topology operated in the discontinuous conduction mode. With the coordination of active clamping components, a resonant technique is obtained and zero-voltage-switching (ZVS) can be achieved. The proposed converter is combined with the advantages of: (1) compared with two-stage circuit, a single stage circuit decreases the component of the main circuit and reduces the complexity of the control circuit; (2) a boost topology with PFC function operated in discontinuous conduction mode can be accomplished without adding any current detecting technique or detecting input signal; (3) by using the inductor from the PFC stage, ZVS function can be achieved without any additional inductor; (4) the increment of switching frequency facilitates the optimization of power density; (5) the conducting loss at the secondary side can be reduced by adding the synchronous rectification; (6) in this proposed scheme, the dual transformers with series-parallel connection are utilized, the current at the secondary side can be shared for lowering the conduction loss of the synchronous transistors. Finally, a prototype converter with AC 110 V input and DC 19 V/6.32 A (120 W) output under 300 kHz switching frequency is implemented. The efficiency of the proposed converter reaches 88.20% and 0.984 power factor in full load condition.

Sign in / Sign up

Export Citation Format

Share Document