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<p>The auxiliary circuit is a widely used method to enhance the transient response of buck converters. However, it can influence the control behavior of buck converters, leading to performance degradation. This paper proposes a compensation method for buck converter control that derives the compensation voltage from the auxiliary circuit current, ensuring that regulation is unaffected by the auxiliary circuit and further enhancing the transient response. The algorithm is implemented on a field-programmable gate array (FPGA) and validated on a 12&#xa0;V–0.9&#xa0;V buck converter equipped with a switched capacitor auxiliary circuit (SCAC). Through this algorithm, the voltage undershoot under a load current step of 280&#xa0;A with a slew rate of 1037&#xa0;A/µs is reduced from 91 mV to 64 mV.</p>

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Transient response control compensation algorithm for buck converter with auxiliary circuit

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Chuan Wu,
  • Kezhu Song,
  • Wanxin Zhou,
  • Dongyi Xie,
  • Chengyang Zhu

摘要

The auxiliary circuit is a widely used method to enhance the transient response of buck converters. However, it can influence the control behavior of buck converters, leading to performance degradation. This paper proposes a compensation method for buck converter control that derives the compensation voltage from the auxiliary circuit current, ensuring that regulation is unaffected by the auxiliary circuit and further enhancing the transient response. The algorithm is implemented on a field-programmable gate array (FPGA) and validated on a 12 V–0.9 V buck converter equipped with a switched capacitor auxiliary circuit (SCAC). Through this algorithm, the voltage undershoot under a load current step of 280 A with a slew rate of 1037 A/µs is reduced from 91 mV to 64 mV.