Fixed off Time Based Power-Factor Correction for AC-DC Converter
Jahangeer Ahmad1, Santosh Sonar2

1Santosh Sonar*, This work has been supported by Thapar Institute of Engineering and Technology, Patiala, Punjab, India.
2Jahangeer Ahmad, Department of Electrical and Instrumentation Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab, India
Manuscript received on December 13, 2019. | Revised Manuscript received on December 22, 2019. | Manuscript published on January 10, 2020. | PP: 2232-2238 | Volume-9 Issue-3, January 2020. | Retrieval Number: C8981019320/2020©BEIESP | DOI: 10.35940/ijitee.C8981.019320
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Abstract: The conversion of A.C to D.C determines the distortion of the mains current A.C., which degrades the input power factor. The main reason for a poor power factor is the non-linear nature of the circuit. In this paper power factor is improved by using a basic boost converter and a control technique based on the fixed off time(FOT) approach .The traditional approach to the correction of the power factor in the boost converter is the continuous conduction mode with fixed frequency (FF-CCM) and the transition mode (TM) PWM (fixed connection time, variable frequency). In the first mode, the inductor operates in continuous conduction mode (CCM) and uses the average current-mode control mode; a complex technique involves a considerable number of components. The second method uses the more complex control technique of the peak current mode that makes the inductor work between continuous and discontinuous mode, which uses fewer components, unstable greater than 50% duty cycle and is more cost efficient. A third approach, the fixed off time (FOT) is gaining popularity which is conditionally stable for a duty cycle of over 50% and does not need compensation. The paper work carried out to use the power factor correction (PFC) based on DC-DC Flyback converter. To verify the design and operation of the circuit, the simulation is performed in PSIM .A prototype is developed and results are presented. 
Keywords: Fixed-Frequency Continuous Conduction Mode (FF-CCM), Transition Mode (TM), Fixed OFF Time (FOT), Power Factor Correction (PFC
Scope of the Article: Frequency Selective Surface