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A novel control scheme of quasi resonant valley-switching for high-power-factor ac-to-dc led drivers

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A novel control scheme of quasi resonant valley-switching for high-power-factor ac-to-dc led drivers

  1. 1. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT A NOVEL CONTROL SCHEME OF QUASI-RESONANT VALLEY-SWITCHING FOR HIGH-POWER-FACTOR AC-TO-DC LED DRIVERS By A PROJECT REPORT Submitted to the Department of electronics & communication Engineering in the FACULTY OF ENGINEERING & TECHNOLOGY In partial fulfillment of the requirements for the award of the degree Of MASTER OF TECHNOLOGY IN ELECTRONICS & COMMUNICATION ENGINEERING APRIL 2016
  2. 2. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT CERTIFICATE Certified that this project report titled “A NOVEL CONTROL SCHEME OF QUASI- RESONANT VALLEY-SWITCHING FOR HIGH-POWER-FACTOR AC-TO-DC LED DRIVERS” is the bonafide work of Mr. _____________Who carried out the research under my supervision Certified further, that to the best of my knowledge the work reported herein does not form part of any other project report or dissertation on the basis of which a degree or award was conferred on an earlier occasion on this or any other candidate. Signature of the Guide Signature of the H.O.D Name Name
  3. 3. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT DECLARATION I hereby declare that the project work entitled “A NOVEL CONTROL SCHEME OF QUASI- RESONANT VALLEY-SWITCHING FOR HIGH-POWER-FACTOR AC-TO-DC LED DRIVERS” Submitted to BHARATHIDASAN UNIVERSITY in partial fulfillment of the requirement for the award of the Degree of MASTER OF APPLIED ELECTRONICS is a record of original work done by me the guidance of Prof.A.Vinayagam M.Sc., M.Phil., M.E., to the best of my knowledge, the work reported here is not a part of any other thesis or work on the basis of which a degree or award was conferred on an earlier occasion to me or any other candidate. (Student Name) (Reg.No) Place: Date:
  4. 4. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT ACKNOWLEDGEMENT I am extremely glad to present my project “A NOVEL CONTROL SCHEME OF QUASI- RESONANT VALLEY-SWITCHING FOR HIGH-POWER-FACTOR AC-TO-DC LED DRIVERS” which is a part of my curriculum of third semester Master of Science in Computer science. I take this opportunity to express my sincere gratitude to those who helped me in bringing out this project work. I would like to express my Director, Dr. K. ANANDAN, M.A.(Eco.), M.Ed., M.Phil.,(Edn.), PGDCA., CGT., M.A.(Psy.) of who had given me an opportunity to undertake this project. I am highly indebted to Co-Ordinator Prof. Muniappan Department of Physics and thank from my deep heart for her valuable comments I received through my project. I wish to express my deep sense of gratitude to my guide Prof. A.Vinayagam M.Sc., M.Phil., M.E., for her immense help and encouragement for successful completion of this project. I also express my sincere thanks to the all the staff members of Computer science for their kind advice. And last, but not the least, I express my deep gratitude to my parents and friends for their encouragement and support throughout the project.
  5. 5. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT ABSTRACT: This paper presents a novel control scheme of quasi-resonant (QR) mode and valley- switching for high-power-factor (PF) ac-to-dc light-emitting diode (LED) drivers. The proposed driver control scheme is based on a buck PF corrector converter, which is operated in QR valley- switching. The proposed control scheme can directly sense the QR valley signal from the current sensor, and it is definitely different from the conventional method which senses the QR valley signal from auxiliary winding. The cost and size of the driver circuit can be remarkably reduced when the proposed control scheme is adopted. Furthermore, the proposed circuit can provide not only high PF and low total harmonic distortion but also high conversion efficiency. Up to 0.99 PF and 91.5% efficiency are obtained from an 8-W (40-W replaced) LED bulb driver prototype.
  6. 6. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT INTRODUCTION: In general, the driver circuit design dominates the energy efficiency as significantly as the light sources. In other words, the lighting product efficiency can be considerably improved via an appropriate driver circuit. Moreover, acquiring electrical energy from the wall plugs (ac line voltage source) is the familiar way. However, LEDs are more suitable to be driven by a dc voltage in accordance with their characteristics, and thus, an ac-to-dc conversion stage is necessary. Furthermore, the switching converter is one of the most common and efficient LED driving solutions. In general, conventional ac-to-dc switching converters are constructed from a diode-bridge rectifier followed by a bulk capacitor and a dc-to-dc switching converter. This topology has inherent drawbacks, such as the poor performances in power factor (PF) and total harmonic distortion (THD). Therefore, an additional PF correction (PFC) stage is associated with the traditional converter, in order to comply with the current harmonic regulations and improve the PF at the same time. In spite of its good performance, the two stage solutions are usually more inefficient and have a lower cost/performance ratio. However, the conventional control scheme of QR valleyswitching senses the valley signal from an auxiliary winding, which hinders the magnetic core selection and further raises the driver cost and size.According, it can be observed that the conventional solution needs not only an auxiliary winding but also an extra sensing pin on the control integrated circuit (IC), and thus, the IC package, size, and cost are also limited. In order to further simplify the bill of material cost and size of the LED driver circuit, this paper proposes a novel control scheme of QR valley-switching for a high-PF ac-to-dc LED driver circuit, .
  7. 7. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT The proposed control circuit can innovatively sense the QR valley signal from the current sense, and it is definitely different from the conventional way. In this way, both of the auxiliary winding and the extra sensing pin on the control IC can be removed. Following the description of the proposed circuit are the insight into the operating principle, the design equations, and an example application of an 8-W LED bulb. Finally, the experimental results verify the accuracy of the theoretical analysesFor the sake of improving the aforementioned disadvantages and reducing the driver cost, there are several topologies for LED driver circuits that have been developed consequently. Although these LED driver circuits have many advantages, their efficiencies are usually not good enough (about 80%). In order to enhance the power efficiency, quasi-resonant (QR) valley-switching is one of the most familiar methods. The QR valley-switching is achieved by the L−C resonant tank, which is composed of the main inductance and the parasitic capacitance of the power MOSFET. In this way, the power MOSFET will be switched on once the drain-tosource voltage resonates to the lowest value to minimize the switching loss, and this technique is called valley-switching
  8. 8. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT EXISTING SYSTEM: In order to enhance the power efficiency, quasi-resonant (QR) valley-switching is one of the most familiar methods. The QR valley-switching is achieved by the L−C resonant tank, which is composed of the main inductance and the parasitic capacitance of the power MOSFET. In this way, the power MOSFET will be switched on once the drain-to-source voltage resonates to the lowest value to minimize the switching loss, and this technique is called valley-switching
  9. 9. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT PROPOSED SYSTEM: In order to further simplify the bill of material cost and size of the LED driver circuit, this paper proposes a novel control scheme of QR valley-switching for a high-PF ac-to-dc LED driver circuit. The proposed control circuit can innovatively sense the QR valley signal from the current sense, and it is definitely different from the conventional way. In this way, both of the auxiliary winding and the extra sensing pin on the control IC can be removed.
  10. 10. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT ADVANTAGES:  Leading to a higher efficiency.  The auxiliary winding can be eliminated to minimize the magnetic core size and cost.  The cost and size of the final controller would be reasonable and competitive
  11. 11. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT BLOCK DIAGRAM:
  12. 12. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT TOOLS AND SOFTWARE USED:  MPLAB – microcontroller programming.  ORCAD – circuit layout.  MATLAB/Simulink – Simulation
  13. 13. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT APPLICATIONS:  Light-emitting diodes (LEDs).
  14. 14. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT CONCLUSION: A novel QR valley-switching scheme for a high-PF ac-todc LED driver circuit has been presented. Since the proposed QR valley-switching scheme can detect the valley from current sense resistance, the auxiliary winding can be eliminated to minimize the magnetic core size and cost. The optimal design of circuit parameters ensures that the circuit can achieve the enuine feature of QR valley-switching, leading to a higher efficiency. A prototype circuit designed for an 8-W LED bulb is implemented and measured to verify the theoretical analyses. The experimental results show that the prototype circuit meets the design targets. Over the universal input line voltage, a PF higher than 0.93 and a THD less than 23% can be achieved. With the proposed QR valley-switching process, the LED driver circuit achieves a maximum efficiency of 91.5%.
  15. 15. OUR OFFICES @CHENNAI/ TRICHY/ KARUR / ERODE / MADURAI / SALEM / COIMBATORE / BANGALORE / HYDRABAD CELL: 9894917187 | 875487 1111 / 2111 / 3111 / 4111 / 5111 / 6111 Visit: www.ecwaytechnologies.com | www.ecwayprojects.com Mail to: ecwaytechnologies@gmail.com ECWAY TECHNOLOGIES IEEE SOFTWARE | EMBEDDED | MECHANICAL | ROBOTICS PROJECTS DEVELOPMENT REFERENCES: [1] D. G. Lamar et al., “Design-oriented analysis and performance evaluation of a low-cost high- brightness LED driver based on flyback power factor corrector,” IEEE Trans. Ind. Electron., vol. 60, no. 7, pp. 2614–2626, Jun. 2013. [2] Y. C. Li and C. L. Chen, “A novel single-stage high-power-factor ac-todc LED driving circuit with leakage inductance energy recycling,” IEEE Trans. Ind. Electron., vol. 59, no. 2, pp. 793–802, Feb. 2012. [3] Y. C. Li and C. C. Chen, “A novel primary-side regulation scheme for single-stage high- power-factor ac–dc LED driving circuit,” IEEE Trans. Ind. Electron., vol. 60, no. 11, pp. 4978– 4986, Nov. 2013. [4] S. Jung and G. Cho, “Transformer coupled recycle snubber for highefficiency offline isolated LED driver with on-chip primary-side power regulation,” IEEE Trans. Ind. Electron., vol. 61, no. 12, pp. 6710–6719, Dec. 2014. [5] C. Moo, Y. Chen, and W. Yang, “An efficient driver for dimmable LED lighting,” IEEE Trans. Power Electron., vol. 27, no. 11, pp. 4613–4618, Nov. 2012

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