**ABSTRACT:**

The paper evolves a mechanism for improving the input power factor of an AC-DC-DC conversion system. It involves the process of shaping the input current wave to phase align with the input supply through a process of error compensation. The methodology includes cohesive formulation to arrive at nearly unity power factor and enjoy the etiquettes of output voltage regulation. The theory assuages to subscribe the benefits for the entire range of operating loads. It eliminates the use of passive components and fortifies the principles of pulse width modulation (PWM) for realizing the change in duty cycle. The MA TLAB based simulation results arbitrate the viability of the proposed approach and exhibit its suitability for use in real world applications.

** ****KEYWORDS:**

- Ac-dc converter
- Power factor
- THD
- Voltage regulation

** ****SOFTWARE: **MATLAB/SIMULINK

** ****CIRCUIT DIAGRAM:**

Figure 1. Power Factor Correction Control of Boost Converter

** ****EXPECTED SIMULATION RESULTS:**

** **

** **Figure 2. Steady State Input AC Voltage and Input AC Current Waveform

Figure 3. Steady State Rectified DC Voltage and Rectified DC Current Waveform

Figure 4. Steady State Regulated DC Output Voltage and Regulated DC Output Current Waveform

Figure 5. Power Factor Measurement of the Proposed Power Factor Correction Boost Converter

Figure 6. FFT Spectrum of the AC input current of Proposed Power Factor Correction Boost Converter

Figure 7. Transient response of Input AC Voltage and Input AC Current Waveform

Figure 8. Transient Response of Rectified DC Voltage and Rectified DC Current Waveform

Figure 9. Transient Response of Regulated DC Output Voltage and Regulated DC Output Current Waveform

Figure 10. Power Factor Measurement of the Proposed Power Factor Correction Boost Converter at transient condition

**CONCLUSION:**

A single stage power factor correction strategy has been proposed for full bridge diode rectifier fed boost converter to support a 400W, lA DC load. The suitability of boost converter for power factor correction has been illustrated by the elimination of input capacitor filter and low output ripple factor. The formulated control design has been effectively orchestrated to correct the power factor in addition providing good voltage regulation. The transient performance has been portrayed to up-heave the strength of the control structure with an adequate output regulation and effective harmonic elimination. The control plan has been nurtured to standardize the THD level of the system that prevents the adverse effects of harmonics being injected in the grid. The exclusion of additional passive components and interleaving configuration has been fostered to reduce the size thus making it more adaptive to low cost compact electronic applications with high standards .

** ****REFERENCES:**

[1] M. Milanovic, F . Mihalic, K. Jezernik and U. Milutinovic,” Single phase unity power factor correction circuits with coupled inductance,” Power Electronics Specialists Conference, 1992, vol.2, pp. l077-1082.

[2] M. Orabi and T Ninomiya, “Novel nonlinear representation for two stage power-factor-correction converter instability,” IEEE International Symposium on Industrial Electronics, 2003, voU, pp- 270-274.

[3] Yu Hung, Dan Chen, Chun-Shih Huang and Fu-Sheng Tsai, “Pulse-skipping power factor correction control schemes for ACIDC power converters,” Fourth International Conference on Power Engineering, Energy and Electrical Drives (POWERENG), 2013, pp-I087-1092.

[4] Lu, D.D. -C, H.H.-C. lu, V. Pjevalica, “A Single-Stage AC/DC Converter With High Power Factor, Regulated Bus Voltage, and Output Voltage,” Power Electronics, IEEE Transactions on, vo1.23, issue. I, pp. 218-228, Jan. 2008.

[5] M. Narimani and G. Moschopoulos, “A New Single-Phase SingleStage Three-Level Power Factor Correction AC-DC Converter,” Power Electronics, IEEE Transactions on , vol.27, issue.6, pp. 2888- 2899, June. 2012.