Interleaved digital power factor correction based on the sliding mode approach
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The document discusses an interleaved digital power factor correction (PFC) system utilizing two boost converters for improved efficiency and reduced electromagnetic interference. It highlights the advantages of interleaving, such as reduced output capacitor ripple and better power factor, while also addressing drawbacks like heat management and high total harmonic distortion. The proposed system aims to ensure equal current sharing between the converters and is beneficial for applications such as electrical battery charging and lighting.
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Copyright © 2016LeMenizInfotech. All rights reserved
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parallelling semiconductors to reduce conduction losses Finally,
interleaving also reduces output capacitor high frequency ripple. One
significant drawback of the interleaved boost PFC converter is that
similar to the boost PFC converter, it retains the problem of heat
management in the input diode bridge.
Drawbacks:
Electromagnetic interference (EMI) generation
High THD
No dynamic response
Proposed system:
The PFC system proposed consists of two interleaved unidirectional
boost converters which are regulated by a digital controller so that
each boost cell behaves like an LFR. An LFR is a two-port switching
structure of the POPI type (power output = power input) [45] because
all the power absorbed by the input port (Pin ) is ideally transmitted to
the output port (Pout ). The second characteristic of an LFR is the
proportionality between voltage and current at the input port, which](https://image.slidesharecdn.com/interleaveddigitalpowerfactorcorrectionbasedonthesliding-modeapproach-161006125819/85/Interleaved-digital-power-factor-correction-based-on-the-sliding-mode-approach-2-320.jpg)
Interleaved digital power factor correction based on the sliding mode approach
- 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 Interleaved Digital Power Factor Correction Based on the Sliding-Mode Approach Introduction: In recent years, researchers and engineers have been striving to improve power factor correction (PFC) and ensure that the quality of the absorbed grid current complies with the stipulations of standard regulations. Although many switching power converters have been proposed to substitute passive rectifiers, the most popular PFC circuit for applications lower than 1 kW is still configured by a boost converter connected to the grid by a diode bridge. This is because of the intrinsic advantages of this simple stage, i.e., the input current is continuous, the transistor is grounded, and it is simple and highly efficient. For higher power levels and single-phase applications, the interleaving technique is recommended. Existing system: The interleaved boost converter, illustrated in Fig, consists of two boost converters in parallel, operating 180◦ out of phase. The input current is the sum of the two inductor currents in LB1 and LB2. Interleaving yields several advantages. The ripple currents in these inductors are out of phase, so they tend to cancel each other out, and therefore reduce the high frequency input ripple current caused by the boost switching action, so the input EMI filter can be smaller. Additionally, the topology also inherently has the advantage of
- 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 parallelling semiconductors to reduce conduction losses Finally, interleaving also reduces output capacitor high frequency ripple. One significant drawback of the interleaved boost PFC converter is that similar to the boost PFC converter, it retains the problem of heat management in the input diode bridge. Drawbacks: Electromagnetic interference (EMI) generation High THD No dynamic response Proposed system: The PFC system proposed consists of two interleaved unidirectional boost converters which are regulated by a digital controller so that each boost cell behaves like an LFR. An LFR is a two-port switching structure of the POPI type (power output = power input) [45] because all the power absorbed by the input port (Pin ) is ideally transmitted to the output port (Pout ). The second characteristic of an LFR is the proportionality between voltage and current at the input port, which
- 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 implies a unity PF. Parameter r defines the chosen input resistive impedance of the circuit in steady state. The emulated resistance value is also defined as r = 1/G, where G represents the conductance of the LFR. If the digital controller requires each boost cell to behave like an LFR behavior, the steady-state representation of Fig can be modelled where two LFRs in parallel. Hence, the total input resistive impedance r corresponds to the equivalent resistance value of the parallel resistors r1 and r2, while the total output power Po becomes the sum of the power delivered by both LFR sources (P1 and P2 ). For a proper interleaving operation, the input current Iin must be shared equally through each boost converter. This can be ensured by adjusting r1 = r2, so that each boost cell absorbs half of the input current and delivers half of the total output power (Po1 = Po2 = Po/2). This means that both inductor currents must share the same current reference and each boost cell must be controlled independently to ensure that the input current is equally distributed. Figure. Scheme of the digitally controlled PFC system based on two interleaved boost converters. Advantages: Simple stage, i.e., the input current is continuous
- 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 Transistor is grounded, and it is simple and highly efficient Better power factor The total harmonic distortion (thd) of the input current could be reduced Stability and Dynamic response Applications: Electrical battery charging applications Lighting applications Block diagram: AC supply L-filter Rectifier Two interleaved boost converters DC load Isolation circuit Buffer circuit Micro- controller circuit 5V DC Supply 12V DC Supply