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基于平均電流模式的同步Buck數(shù)字電源設(shè)計(jì)研究
2023年電子技術(shù)應(yīng)用第2期
李鍵文,潘永雄,,徐家銳,梁康
廣東工業(yè)大學(xué) 物理與光電工程學(xué)院,,廣東 廣州 510006
摘要: 高效率、高開關(guān)頻率和數(shù)字控制是近年來開關(guān)電源領(lǐng)域的研究熱點(diǎn)。探討了基于平均電流模式的同步Buck數(shù)字電源設(shè)計(jì)策略,結(jié)合理論分析和Matlab/Simulink軟件仿真,,分析了同步Buck的環(huán)路設(shè)計(jì)條件,,詳細(xì)闡述了兩種電壓電流雙閉環(huán)PI補(bǔ)償器的設(shè)計(jì)方法,并提出了一種基于電流環(huán)簡化的電壓環(huán)設(shè)計(jì)方法,。使用高性能主流MCU芯片STM32G474作為控制核心,利用高分辨率PWM技術(shù)實(shí)現(xiàn)200 kHz的開關(guān)頻率,,以中斷事件觸發(fā)和狀態(tài)機(jī)運(yùn)行思想來構(gòu)建系統(tǒng)軟件的架構(gòu),。仿真和實(shí)驗(yàn)結(jié)果表明系統(tǒng)具有效率高、動態(tài)響應(yīng)快和魯棒性強(qiáng)等特點(diǎn),,為數(shù)字電源的通用化設(shè)計(jì)提供了參考,。
中圖分類號:TM46
文獻(xiàn)標(biāo)志碼:A
DOI: 10.16157/j.issn.0258-7998.222980
中文引用格式: 李鍵文,潘永雄,,徐家銳,,等. 基于平均電流模式的同步Buck數(shù)字電源設(shè)計(jì)研究[J]. 電子技術(shù)應(yīng)用,2023,,49(2):121-126.
英文引用格式: Li Jianwen,,Pan Yongxiong,Xu Jiarui,,et al. Research on design of synchronous buck digital power supply based on average current mode[J]. Application of Electronic Technique,,2023,49(2):121-126.
Research on design of synchronous buck digital power supply based on average current mode
Li Jianwen,,Pan Yongxiong,,Xu Jiarui,Liang Kang
School of Physics and Optoelectronic Engineering,, Guangdong University of Technology,, Guangzhou 510006, China
Abstract: High efficiency, high switching frequency and digital control are the research hotspots in the field of switching power supply in recent years. In this paper, the design strategy of synchronous buck digital power supply based on average current mode is discussed. Combined with theoretical analysis and Matlab/Simulink software simulation, the loop control design conditions of synchronous buck are analyzed, two design methods of voltage and current double closed-loop PI compensator are described in detail, and a voltage loop control design method based on the simplification of the current loop is proposed. The high-performance mainstream MCU chip STM32G474 is used as the control core, and the high-resolution PWM technology is used to realize a switching frequency of 200 kHz, and the architecture of the system software is constructed with the idea of interrupt event triggering and state machine operation. The simulation and experimental results show that the system has the characteristics of high efficiency, fast dynamic response and strong robustness, which provides a reference for the general design of digital power supply.
Key words : synchronous buck,;double closed-loop PI control,;average current mode;digital power

0 引言

    同步Buck變換器在傳統(tǒng)Buck變換器基礎(chǔ)上結(jié)合了同步整流技術(shù),,具有效率高,、體積小和拓?fù)浣Y(jié)構(gòu)簡單等優(yōu)點(diǎn)。同步Buck變換器控制可以采用模擬控制或數(shù)字控制兩種方式,,相對于傳統(tǒng)模擬控制而言,,數(shù)字控制具有較強(qiáng)的適應(yīng)性和靈活性[1],數(shù)字控制的實(shí)現(xiàn)要求設(shè)計(jì)者具備使用高性能數(shù)字控制芯片的能力,、仿真分析控制算法的能力以及良好的自動控制理論基礎(chǔ),。

    文獻(xiàn)[2]詳細(xì)介紹了同步Buck數(shù)字電源的硬件電路設(shè)計(jì),包括主電路器件選型,、驅(qū)動電路設(shè)計(jì)和輔助電源電路設(shè)計(jì),。文獻(xiàn)[3]基于平均電流模式同步Buck數(shù)字電源,,討論了電壓模式和電流模式下的閉環(huán)控制器設(shè)計(jì),提出在PI補(bǔ)償器的基礎(chǔ)上增加一個(gè)高頻極點(diǎn)以降低系統(tǒng)的高頻噪聲,。文獻(xiàn)[4]提出了同步Buck電路的雙閉環(huán)PI參數(shù)計(jì)算方法,,對引入補(bǔ)償器后的系統(tǒng)開環(huán)傳遞函數(shù)按照系統(tǒng)型別進(jìn)行補(bǔ)償器優(yōu)化設(shè)計(jì)。本文在以上研究的基礎(chǔ)上結(jié)合理論分析和Matlab/Simulink軟件仿真,,分析了同步Buck的環(huán)路設(shè)計(jì)條件,,確保變換器在嚴(yán)苛條件下仍能穩(wěn)定運(yùn)行,詳細(xì)闡述了兩種電壓電流雙閉環(huán)PI參數(shù)設(shè)計(jì)方法,,提出一種基于電流環(huán)簡化的電壓環(huán)設(shè)計(jì)方法,,提高了數(shù)字環(huán)路設(shè)計(jì)的靈活性,并以ST公司的STM32G474處理器為主控芯片,,設(shè)計(jì)了一款基于平均電流模式的同步Buck數(shù)字電源,,實(shí)現(xiàn)高精度恒壓恒流電源功能,具有一定的參考意義和實(shí)用性,。




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作者信息:

李鍵文,潘永雄,,徐家銳,,梁康

(廣東工業(yè)大學(xué) 物理與光電工程學(xué)院,廣東 廣州 510006)




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