臺灣博碩士論文加值系統

In this thesis, an AC adapter with power factor correction (PFC) using a single–stage flyback converter is presented. The hardware circuit of the AC adapter includes a diode bridge rectifier and a flyback converter in which an isolated transformer is used to step down the large potential difference between the rectified DC voltage and the required load voltage. In order to correct the AC side power factor, an active PFC control chip (L6564D) was adopter in the circuit design. To sum up, the circuit design developed in this study is based on the purpose of lightweight, low-cost circuit, high conversion efficiency, and circuit performance. Experimental results show that the overall circuit performance can meet the specifications.

Recommendation Letter from the Thesis Advisor
Thesis Oral Defense Committee Certification
Acknowledgements iii
Abstract iv
Contents v
List of Tables viii
List of Figures ix
Chapter 1 - 1 -
Introduction - 1 -
1.1 Motivation and Objectives - 1 -
1.2 Thesis Organization - 9 -
Chapter 2 - 11 -
Preliminaries - 11 -
2.1 Flyback Converter - 11 -
2.1.1 Continuous Conduction Mode (CCM) - 11 -
2.1.2 Discontinuous Current Mode (DCM) - 20 -
2.1.3 Multiple Outputs Configuration - 22 -
2.2 Transformer Design - 23 -
2.2.1 Transformer Turn Ratio Design - 26 -
2.3 Snubber Design - 28 -
2.4 Power Factor - 31 -
2.4.1 Power Factor Correction (PFC) - 33 -
2.4.2 Power Factor Control - 36 -
Chapter 3 - 37 -
System Design - 37 -
3.1 70W PFC Adapter Development Study - 37 -
3.2 Circuit Design - 39 -
3.3 Transformer Design - 40 -
3.4 Input Capacitance Design - 45 -
3.5. Output Capacitor Design - 46 -
3.6 Power Switch Design - 46 -
3.7. Rectifier Diode Design - 47 -
3.8 Control Circuit Parameter Design - 47 -
3.8.1 Feedback control circuit - 51 -
3.8.2. ZCD Zero Current Detection Resistor Design - 54 -
3.8.3. CS Current Detection Resistor Design - 56 -
Chapter 4 ...- 59 -
Experimental Results - 59 -

4.1 Load Regulation Performance - 59 -
4.2. Line Regulation Performance - 60 -
4.3. Power on/off Output Transient Test - 60 -
4.4. Load Step Change Test - 62 -
4.5. Output Ripple Test - 63 -
4.6. Power Factor Correction (PFC) Test - 64 -
4.7. Switching Efficiency Comparison Test - 66 -
Chapter 5 - 70 -
Conclusion - 70 -
References - 71 -
Appendix A: Circuit Block Diagram - 78 -
Appendix B: Control Circuit Board - 79 -
Appendix C: BOM- Control Circuit Board - 80 -
Appendix D: Power Stage - 82 -
Appendix E: BOM- Power Stage - 83 -
Appendix F: ALL Stage - 84 -
Appendix G: BOM-ALL Stage - 85 -





List of Tables
Table 3.1 Design specifications. - 40 -
Table 3.2 ETD29/16/10-3C96 parameters. - 42 -
Table 3.3 L6564D pin function. - 49 -
Table 4.1 Load regulation. - 59 -
Table 4.2 Line regulation. - 60 -
Table 4.3 Converter performance @ 100V (AC). - 67 -
Table 4.4 Converter performance @ 240V (AC). - 68 -





List of Figures
Figure 2.1 (a) Equivalent circuit using a transformer model that includes the magnetizing inductance; (b) Circuit for switch on; (c) Circuit for the switch off; (d) Transformer model used for power electronics circuits. - 12 -
Figure 2.2 Flyback converter current and voltage waveforms. (a) Magnetizing inductance current; (b) Source current; (c) Diode current; (d) Capacitor current; (e) Transformer primary voltage. - 18 -
Figure 2.3 Discontinuous current for the flyback converter. - 21 -
Figure 2.4 Multiple winding configuration flyback converter. - 22 -
Figure 2.5 (a) EFD29 transformer windings (b) Bobbin [38]. - 25 -
Figure 2.6 Transformer with interleaved windings [39]. - 27 -
Figure 2.7 RCD clamp on the primary side suppresses voltage overshoot across the MOSFET…. - 28 -
Figure 2.8 RC snubber on the secondary side. - 30 -
Figure 2.9 Full-wave rectifier. - 34 -
Figure 2.10 (a) A rectifier circuit used to produce a high power factor and low THD; (b) Current in the inductor for continuous current mode (CCM) operation; (c) Current from the ac source….. - 35 -
Figure 2.11 Discontinuous current mode (DCM) PFC. - 36 -
Figure 3.1 Typical architecture of the AC/DC adapter [47]. - 38 -
Figure 3.2 Application of common isolated DC/DC converters [47]. - 39 -
Figure 3.3 Inductor current waveform and MOSFET timing in TM [45]. - 41 -
Figure 3.4 Hysteresis curve of flyback converter (a) CCM Mode; (b) DCM Mode. - 43 -
Figure 3.5 L6564D internal block diagram [45]. - 49 -
Figure 3.6 Feedback control circuit. - 51 -
Figure 3.7 ZCD operating parameters [46]. - 55 -
Figure 3.8 Zero current detection and best trigger point [45]. - 56 -
Figure 3.9 Wave front shadowing (leading-edge blanking). - 57 -
Figure 3.10 CS operating parameters [46]. - 57 -
Figure 4.1 Full load on/off output transient test under 100VAC input. - 61 -
Figure 4.2 Full load on / off output transient test under 240VAC input. - 61 -
Figure 4.3 Load step change test under 100VAC input. - 62 -
Figure 4.5 Load step change test under 240VAC input. - 62 -
Figure 4.6 Output ripple test under 100VAC input. - 63 -
Figure 4.7 Output ripple test under 240VAC input. - 64 -
Figure 4.8 Light load and full load voltage and current waveforms under 100VAC input………. - 65 -
Figure 4.9 Light load and full load voltage and current waveform under 240VAC input. ……..……………………………………………………………………- 66 -
Figure 4.10 Power efficiency comparison test (80kHz). - 67 -
Figure 4.11 Physical circuit of the proposed single stage flyback converter. - 69 -

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