Bumpless control for reduced thd in power factor correction circuits
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The document discusses a new bumpless controller design for power factor correction circuits aimed at improving energy efficiency and power factor compliance with standards like Energy Star. It highlights the benefits of using a semi-bridgeless topology, which offers high efficiency and lowers ripple content, making it suitable for energy storage and renewable energy applications. The proposed system's performance is enhanced by testing the bumpless controllers through simulations and hardware implementation.
Bumpless control for reduced thd in power factor correction circuits
- 1. The Master of IEEE Projects Copyright © 2016LeMenizInfotech. All rights reserved LeMenizInfotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web :www.lemenizinfotech.com/ www.ieeemaster.com Mail : projects@lemenizinfotech.com Bumpless Control for Reduced THD in Power Factor Correction Circuits Introduction: Power factor correction circuits should conserve energy and have a high power factor, as a matter of course. In the commercial marketplace, certifying a product with an energy-saving program differentiates that product and offers a competitive advantage. Two examples of energy-savings certifications are the 80 PLUS program that requires 90% efficiency at a 0.2 per unit (p.u.) load, and the ENERGY STAR version 5.0 standard that requires a power factor of at least 0.65 at a 0.1 p.u. load. Researchers have devised control strategies that may be used to meet these requirements, and typically use multiple controllers. The salient features of these approaches is to partition the PFC operation into discrete regions based on load, CCM- DCM operation, or other criteria; synthesize a controller for each region; and switch between the controllers based on the operating region. Switching between controllers will result in a discontinuous signal that can degrade performance, Existing system: The sensed signal which contains the diode current information is positive. Therefore the proposed sensing circuit has a simple structure because it is freed of an external amplifier and negative bias voltage. The effect of the sensing resistor on the output voltage is negligible because the Digital Control of a Power Factor Correction Boost rectifier with the proposed diode sensing scheme. Voltage
- 2. The Master of IEEE Projects Copyright © 2016LeMenizInfotech. All rights reserved LeMenizInfotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web :www.lemenizinfotech.com/ www.ieeemaster.com Mail : projects@lemenizinfotech.com across the R sense is very small with respect to the output voltage ripple. Drawbacks: Degrade performance. Less power factor. Proposed system: Bumpless controllers will be introduced, the DCM-CCM models for the inner current loop will be used to illustrate the significant differences between the plant in the two operating modes, two bumpless controllers will be synthesized for the two operating modes, the bumpless controllers will be tested in simulation, and the bumpless controllers will be implemented in hardware using a 750 watt semi-bridgeless PFC. The bumpless controllers will be designed for a semi bridgeless topology. The semi-bridgeless PFC topology was chosen for its high efficiency. The PFC has two loops, a current
- 3. The Master of IEEE Projects Copyright © 2016LeMenizInfotech. All rights reserved LeMenizInfotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web :www.lemenizinfotech.com/ www.ieeemaster.com Mail : projects@lemenizinfotech.com loop and a voltage loop. The plant for the current loop may be derived using state space averaging, or Vorperian’s model, for the PWM switch. Advantages: High power factor. Good performance operation. Low ripple content. Applications: Energy storage applications. Renewable energy applications.
- 4. The Master of IEEE Projects Copyright © 2016LeMenizInfotech. All rights reserved LeMenizInfotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web :www.lemenizinfotech.com/ www.ieeemaster.com Mail : projects@lemenizinfotech.com Block diagram: Input AC Supply Semi bridgeless PFC circuit Output C filter Load Isolation Circuit12V DC 5V DC Buffer Circuit Micro Controller Circuit