【摘要】：為減少小功率供電電源的器件使用數(shù)量、降低成本和提高變換效率,提出一種諧振電容電壓反饋控制的不對稱半橋反激式變換器。采用一次側(cè)諧振電容電壓反饋控制方式,簡化了隔離型單輸入多輸出變換器的控制結(jié)構(gòu);采用恒定導通時間控制器,從而省去反饋補償網(wǎng)絡(luò)電路的設(shè)計;反饋信號取自一次側(cè)諧振電容電壓,具有反饋電壓紋波大的特點,這會引起恒定導通時間控制出現(xiàn)脈沖破裂現(xiàn)象,變換器不能穩(wěn)定工作。為抑制諧振電壓反饋紋波大引起脈沖破裂的問題,采用紋波補償恒定導通時間控制抑制反饋信號的電壓紋波,從而使變換器工作穩(wěn)定。最后通過實驗樣機驗證了理論分析及設(shè)計方法的可行性。
[Abstract]:In order to reduce the number of devices used in low power supply, reduce the cost and improve the conversion efficiency, an asymmetric half-bridge flyback converter with resonant capacitor voltage feedback control is proposed. The single-side resonant capacitor voltage feedback control is adopted to simplify the control structure of isolated single-input multi-output converter, and the constant on-time controller is used to eliminate the design of feedback compensation network circuit. The feedback signal is obtained from the primary resonant capacitor voltage, which has the characteristics of large ripple of feedback voltage, which will lead to the phenomenon of pulse breaking in constant on-time control, and the converter can not work stably. In order to restrain the pulse rupture caused by the resonance voltage feedback ripple, the ripple compensation constant conduction time is used to control the voltage ripple of the suppression feedback signal, which makes the converter work stably. Finally, the feasibility of the theoretical analysis and design method is verified by the experimental prototype.
【作者單位】： 福州大學電氣工程與自動化學院;福州大學-科華恒盛電力電子技術(shù)研究中心;
【基金】：福建省自然科學基金資助項目(2013J01178,2016J05154)
【分類號】：TM46

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