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Voltage Doubler Circuit

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A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
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A novel semi-quadratic buck-boost structures with continuous input current for PV application.

Mustafa Okati1, Mahdiyeh Eslami2, Baseem Khan3,4

  • 1Department of Electrical Engineering, Zabol Branch, Islamic Azad University, Zabol, Iran. Mu.okati@gmail.com.

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Summary

This study introduces a new non-isolated semi-quadratic buck/boost converter suitable for PV solar applications. The design offers continuous input current, reduced electromagnetic interference (EMI), and high efficiency in both buck and boost modes.

Keywords:
Buck/boost converterContinuous input/output currentSemi-quadraticSolar PV systemSteady-state analysis

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Renewable Energy Systems

Background:

  • Photovoltaic (PV) solar applications require efficient DC-DC converters with continuous input current to minimize ripple and electromagnetic interference (EMI).
  • Existing non-isolated buck/boost converter designs often present challenges with component stress and efficiency.
  • The need for simplified topologies with improved performance characteristics is critical for advancing PV energy conversion.

Purpose of the Study:

  • To propose a novel non-isolated semi-quadratic buck/boost converter with two structural variations.
  • To enhance suitability for PV solar applications through continuous input current and reduced EMI.
  • To analyze and present the performance, efficiency, and component stress advantages over existing designs.

Main Methods:

  • Design and theoretical analysis of two new non-isolated semi-quadratic buck/boost converter topologies.
  • Mathematical derivation of the semi-quadratic voltage gain formula: D(2-D)/(1-D)^2.
  • Performance evaluation through ideal/non-ideal mode analysis, small-signal analysis, and PLECS simulations.
  • Experimental validation of efficiency in both buck and boost modes.

Main Results:

  • Achieved high efficiency: 94.6% (theoretical) and 91.8% (experimental) in boost mode (72W output).
  • Demonstrated efficiency: 89.3% (theoretical) and 87.2% (experimental) in buck mode (15W output).
  • The proposed topologies feature continuous input current, simplified structure, and reduced voltage/current stress on semiconductor components.
  • Continuous current mode (CCM) is identified as the optimal operating mode.

Conclusions:

  • The novel non-isolated semi-quadratic buck/boost converter design is well-suited for PV solar applications due to its continuous input current and reduced EMI.
  • The proposed topologies offer significant advantages in terms of efficiency, component stress, and structural simplicity compared to recent designs.
  • The design is validated through theoretical analysis, simulations, and experimental results, confirming its practical viability.