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<p>This paper presents a flatness-based control design for an isolated DC/DC converter, known as push-pull converter. The operating principle and mathematical model of the converter are first discussed. Subsequently, a two-part controller—a feedforward controller and a feedback controlleris developed to stabilize the converter’s output voltage. The feedforward controller is derived from the converter’s model, while the feedback controller is designed using the LQR framework. The stability of the closed-loop system is proved and extended to the case of uncertain model parameters. Furthermore, a soft start-up mode is implemented through reference trajectory planning to prevent transformer inrush currents and ensure smooth control. The performance of the proposed controller is assessed through simulations and experimental tests, confirming its robustness under input voltage and load variations.</p>

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Flatness-based control of a push-pull converter with built-in soft start-up strategy

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Mohammed Benmiloud,
  • Khaled Ameur,
  • Ioannis Lestas,
  • Atallah Benalia

摘要

This paper presents a flatness-based control design for an isolated DC/DC converter, known as push-pull converter. The operating principle and mathematical model of the converter are first discussed. Subsequently, a two-part controller—a feedforward controller and a feedback controlleris developed to stabilize the converter’s output voltage. The feedforward controller is derived from the converter’s model, while the feedback controller is designed using the LQR framework. The stability of the closed-loop system is proved and extended to the case of uncertain model parameters. Furthermore, a soft start-up mode is implemented through reference trajectory planning to prevent transformer inrush currents and ensure smooth control. The performance of the proposed controller is assessed through simulations and experimental tests, confirming its robustness under input voltage and load variations.