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Buck Boost Coverter

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Design and Application of IDBB Converter.

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  1. Design Of Integrated Double Buck-Boost Power Drive as High PF And Low THD Driver For Power- Led Lamps
  2. Agenda 'Abstract *Introduction to IDBB Converter + Working of IDBB Converter *Analysis OF the Offline IDBB Converter with equivalent circuits *Experimental Analysis + Simulation Results *Conclusion
  3. Abstract An IDBB converter circuit, which can act as a high power factor, low output current ripple, and good efficiency driver for power LED lamps. The input stage is based on the integration of buck boost converter which performs power factor correction (PFC) from a universal ac source, using the PW M operation mode as a control loop In this project, the IDBB converter is analyzed with and without Control algorithm (PI controller), and a design methodology is proposed using Matlab. It is demonstrated that, with a careful design of the converter, the filter capacitances can be made small enough so that film capacitors may be used. The results obtained using PI controller.
  4. INTRODUCTION WHITE POWER LEDs are becoming an attractive light source, owing to their high reliability, long life, high color rendering index, and small size . In addition, there are commercially available units that can reach light efficacies as high as 100 1m/W. All these features make white LEDs a good candidate to override fluorescent and other discharge lamps in many applications, including street lighting, automotive lighting, decorative applications, and household appliances. However, power LEDs are still far from being a panacea since they suffer from several drawbacks. First, due to their nearly constant-voltage behavior, they cannot be supplied from the dc or ac input voltage directly. Therefore, some kind of current-limiting device must be used, similarly to the ballast used to limit the current through a discharge lamp. On the other hand, the high efficacy of power LEDs is only maintained under strict operating conditions, which include low direct current and low junction temperature. All these mean that the development of power supplies that achieve correct driving of the LED- based lamp is an important topic of research.
  5. SCHEMATIC DIAGRAM OF THE IDBB CONVERTER Load Line UDI iM1 Ml 002 D2 IID2 uos iD3
  6. IDBB CONVERTER The converter behaves as two buck—boost converters in cascade. The input buck boost converter is made up by Li, DI, CB, and Ml, and the output buck—boost converter comprises LO, D2, D3, CO, and Ml. The reversing polarity produced by the first converter in the capacitor CB is corrected by the second converter, given a positive output voltage with respect to ground. This simplifies the measurement of the load current for closed-loop operation, thus reducing sensing circuitry and cost. By operating the input inductor Li in discontinuous conduction mode (DCM), the average current through the line will be proportional to the line voltage, therefore providing a near unity PF. On the other hand, the output inductance LO can be operated either in continuous conduction mode (CCM) or DCM. The operation in DCM has the advantage of providing a bus voltage across CB independent of the duty cycle and output power. However, it presents the disadvantage of requiring a higher value of the output capacitance to achieve low current ripple through the load.
  7. ANALYSIS OF THE OFFLINE IDBB CONVERTER In this section, the IDBB converter is analyzed when operated from the main voltage, achieving a near-unity input PF and a low-ripple current through the power-LED load. It is assumed that the line voltage is a sinusoidal waveform given as vg(t) = V g sin oLt. D 2v2 A. Line Current and Input Power Vg ) peak 4L fs B. Output and Bus Voltages vo T) (1 - D)vg 2VR VB vo 2v/R C. Reactive Components 0.5A1 Lo HFfs DIO AVO HFfs
  8. Equivalent circuits for the operation of the IDBB converter. (a) Interval 1: O < t < DTS. (b) Interval 11: DTS < t < DTS + tl. (c) Interval 111: DTS + < t < TS. Line 03 co Load Load Load
  9. MAIN WAVEFORMS OF THE IDBB CONVERTER WITHIN HIGH-FREQUENCY SWITCHING PERIOD AROUND THE PEAK LINE VOLTAGE.
  10. EXPERIMENTAL ANALYSIS
  11. EXPERIMENTAL RESULTS The electric diagram of the developed prototype is shown where the different components used for the diodes, main switch, and inductances are shown. The capacitors used were MKP model 1848 from Vishay with 700-V rating. The 80-gF capacitor measures 45 x 45 x 57.5 mm, and the 40-Mf one measures 25 x 45 x 57.5 mm. There are also smaller models with 450-V rating. However, it must be taken into account that the voltage rating of these capacitors decreases with temperature. The voltage rating should be sufficient for all operating temperatures. The lifetime expectancy of these capacitors is higher than 105 h, as stated by the manufacturer's datasheet. The converter is operated in closed loop to assure a constant current through the LED array.
  12. CHI%OOV DC tootl CH2* IOV DC 10us/div (IOus7div) "3RM.'1M)MS/s CHI CH CHI=IOOV DC loon CHI CH2 DC 10:1 Drain-Souree Voltage Gate-Souree Voltage 5ms(div (Smsfdiv) CHI: Bus Volta e .9 CH2: Output Voltage .9 Waveforms in transistor Ml Vrms line voltage. (Top) at 230- Drain— source voltage (500 V/div). (Bottom) Gate—source voltage (10 V/div). (Horizontal scale) 10 gs/div. Bus and output voltages at nominal power and 230-Vrms line voltage. (Top) Bus voltage (100 V/div). (Bottom) Output voltage (50 V/div). (Horizontal scale) 5 ms/div.
  13. . Lamp Voltage CH2; Lamp Current _ CHI CHI CHI* IOOV CHI*UNJV DC 100:1 lge. Iv CH2*500mv: DC 10:1 309.3mV e. Line Voltage Line 49. tSHz (5mS/dv) AVG'.200kS/5 DC CHQ tootl CH2*OOmV. DC 10•.1 5ms/div (5ms/div) NORM200kS/S CH2 ace-I = aee2* Rms Rms Avi 19G.1V 349.4mv Rms Line voltage and current at nominal power and 230-Vrms line voltage (100 V/div, 0.5 A/div, and 5 ms/div). Lamp voltage and current at nominal power (100 V/div, 0.5 A/div, and 5 ms/div).
  14. 0.5 02 0.1 190 Opernting range t 100/0 Line Voltage High Output Level (350mA) Dimmed Level (250 mA) 200 230 210 220 Line Voltage (V) 240 250 Measured lamp current as a function of the input voltage at closed loop operation. 0.4 0.3 0.2 0.1 EN61000-3-2 Limit 13 15 17 19 1 3 5 7 9 11 Measured harmonic content of the input current compared with the EN61000-3-2 limit.
  15. 100 100 80 60 80 40 20 0 190 Power Factor (%): High output Level (350mA) eee Dimmed Level (250 mA) Total Harmonic Distortion (%): High Output Level (350mA) Dimmed Level (250 mA) 90 70 BBB High Output Level (350mA) 60 Dimmed Level (250 mA) 50 190 200 240 250 200 210 220 230 Line Voltage (V) 240 250 210 220 230 Line Voltage (V) Measured PF and THD of the input current as a function of the line voltage. Measured converter efficiency as a function of the input voltage.
  16. STIMULATION ANALYSIS
  17. STIMULATION FIGURE 1 Szpes Soc«g Sutsystern MosfEt
  18. STIMULATION FIGURE 2 li Vc Fr:mZ signal THO Total Harmonic Distortion 1 Active & Reactiva Powerl Ccnsts nt 2nd Ordar Filter THZ Tc Tc 'Wc#svszel Discrete Controller From li Relsticnsl Ein e:inl Szcpe
  19. LINE VOLTAGE AND CURRENT AT NOMINAL POWER AND 230-VRMS LINE VOLTAGE W.R.T TIME ( X & Y AXIS ) 0.3 INPUT VOLTAGE AND LAMP CURRENT W.R.T TIME ( X & Y AXIS )
  20. OUTPUT VOLTAGE WITHOUT PI CONTROLLER W.R.T TIME ( X & Y AXIS ) OUTPUT VOLTAGE WITH PI CONTROLLER W.R.T TIME ( X & Y AXIS )
  21. CONCLUSION An IDBB converter has been investigated to implement a high-power-factor offline power supply for LED lighting applications. The topology features two buck—boost converters in cascade but using only one controlled switch. By operating the input converter in DCM, a high input PF can be obtained. On the other hand, the operation of the second stage in CCM assures a low-ripple current through the LED load without using a very high output capacitance. In this way, the converter can be implemented using only film capacitors, avoiding the use of electrolytic capacitors and increasing the converter mean time between failures.
  22. REFERENCES [1] E. F. Schubert, Light-Emitting Diodes, 2nd ed. Cambridge, U.K.: Univ. Press, 2006. [2] Cree XLamp XP-C LEDs, 2010, Data Sheet No. CLD-DS19 Rev 4. Cambridge [3] Y. Fang, S.-H. Wong, and L. Hok-Sun Ling, "A power converter with pulse-level- modulation control for driving high brightness LEDs," in Proc. 24th Annu. IEEE APEC , Feb. 15-19, 2009, pp. 577-581. [4] R. A. Pinto, M. R. Cosetin, M. F. da Silva, G. W. Denardin, J. Fraytag, A. Campos, and R. N. do Prado, "Compact emergency lamp using power LEDs," in Proc. 35th Annu. IEEE IECON , Nov. 3-5, 2009, pp. 3494-3499. [5] D. R. Nuttall, system," in Proc. [6] H. Yuequan voltage," in Proc. R. Shuttleworth, and G. Routledge, "Design of a LED street lighting 4th IET Conf. PEMD, Apr. 2-4, 2008, pp. 436-440. and M. M. Jovanovic, "A novel LED driver with adaptive drive 23rd Annu. IEEE APEC, Feb. 24-28, 2008, pp. 565-571.
  23. Thank you

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