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Applying ZCT to Two-Phase Boost Converter with IGBT Switches Used.

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Summary

This study introduces a zero-current-transition (ZCT) strategy for two-phase boost converters using insulated gate bipolar transistors (IGBTs). The method reduces switching losses and improves light-load efficiency, simplifying control and enhancing scalability.

Keywords:
IGBTcurrent balanceinterleavedtwo-phase boost converter

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Area of Science:

  • Electrical Engineering
  • Power Electronics

Background:

  • Insulated gate bipolar transistors (IGBTs) exhibit a current tail during switch-off, increasing switching losses.
  • Two-phase boost converters require efficient switching strategies to mitigate these losses, especially under varying load conditions.

Purpose of the Study:

  • To propose and analyze a constant-frequency zero-current-transition (ZCT) strategy for a two-phase boost converter.
  • To reduce switching losses associated with IGBT current tails.
  • To enhance light-load efficiency and simplify current control.

Main Methods:

  • Implementation of a constant-frequency ZCT strategy using common-ground auxiliary switches.
  • Regulation of switch-off and switch-on timings for auxiliary switches to optimize efficiency.
  • Interleaving of two converter phases with a 180° phase difference and a current-sharing controller.
  • Utilization of a single current sensing circuit for dual-phase current monitoring.

Main Results:

  • Significant reduction in switching losses due to effective management of the IGBT current tail.
  • Improved light-load efficiency achieved through precise control of auxiliary switch timings.
  • Balanced current distribution between the two phases, requiring only one current sensor.
  • Demonstrated scalability for multi-phase converter systems with simplified ZCT and current balance control.

Conclusions:

  • The proposed ZCT strategy effectively minimizes switching losses in two-phase boost converters with IGBTs.
  • The strategy enhances efficiency, particularly at light loads, and simplifies control circuitry.
  • The interleaved multi-phase design with current sharing offers a scalable and efficient power conversion solution.