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Volume 56 Issue 1
Jan.  2021
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Article Contents
Journal of Southwest Jiaotong University  > 2021  >  56(1): 182-189.
XU Limei, WANG Yao, ZHANG Liuyang, YANG Jiayong. Peak-Current and Peak-Voltage Control Scheme for Single-Inductor Dual-Output Buck Converter[J]. Journal of Southwest Jiaotong University, 2021, 56(1): 182-189. doi: 10.3969/j.issn.0258-2724.20191067
Citation: XU Limei, WANG Yao, ZHANG Liuyang, YANG Jiayong. Peak-Current and Peak-Voltage Control Scheme for Single-Inductor Dual-Output Buck Converter[J]. Journal of Southwest Jiaotong University, 2021, 56(1): 182-189. doi: 10.3969/j.issn.0258-2724.20191067
shu

Peak-Current and Peak-Voltage Control Scheme for Single-Inductor Dual-Output Buck Converter

doi: 10.3969/j.issn.0258-2724.20191067
  • Received Date: 05 Nov 2019
  • Rev Recd Date: 22 Apr 2020
    • Available Online: 14 May 2020
  • Publish Date: 01 Feb 2021
    Abstract
  • In order to reduce the output cross regulation of single-inductor dual-output (SIDO) buck converter in continuous conduction mode (CCM), a peak-current and peak-voltage (PCPV) control method is proposed. The circuit structure and operating principle of the PCPV-controlled SIDO buck converter are analyzed. The gain expressions of input voltage and output voltage are deduced according to the principle of inductor volt-second balance and capacitor ampere-second balance. The state space average model of PCPV-controlled SIDO buck converter is established by using the state space average method. On this basis, the small signal model of PCPV-controlled SIDO buck converter is established, which is compared with traditional peak-current-mode (PCM) controlled SIDO Buck converter in the cross regulation. The research results show that the cross regulation from the higher voltage output branch to lower voltage output branch of PCM controlled SIDO Buck converter is 300 mV, and its transient regulation time of load variation is 12.5 ms. However, the proposed converter can reduce the cross regulation to almost zero and reduce the transient regulation time to 10 ms. Compared to the PCM controlled SIDO buck converter, the proposed PCPV-controlled SIDO Buck converter can effectively reduce the cross regulation and improve the transient performance. Finally, the theoretical analysis of the proposed method is verified by experimental results.

     

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