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反激變換器開(kāi)關(guān)噪聲抑制策略
2023年電子技術(shù)應(yīng)用第5期
孫澤,陳息坤,王佳軍,張克松
(上海大學(xué) 機(jī)電工程與自動(dòng)化學(xué)院,上海 200444)
摘要: 多用于小功率輔助電源的反激變換器拓?fù)洌β势骷膶?dǎo)通及關(guān)斷噪聲在高壓輸入的情況下更加嚴(yán)重,甚至導(dǎo)致芯片無(wú)法正常工作。首先分析了反激變換器噪聲的產(chǎn)生機(jī)理,通過(guò)控制變壓器漏感,結(jié)合變換器負(fù)載條件以抑制輸出導(dǎo)通噪聲;其次,利用TL431及光耦變換器特性,設(shè)計(jì)可變補(bǔ)償網(wǎng)絡(luò),從環(huán)路控制方面補(bǔ)償漏感變化造成的系統(tǒng)性能降低;最后,搭建輸入430 V~650 V,多路輸出共10 W的反激輔助電源,實(shí)驗(yàn)結(jié)果驗(yàn)證了設(shè)計(jì)的可行性與正確性。
中圖分類(lèi)號(hào):TN86
文獻(xiàn)標(biāo)志碼:A
DOI: 10.16157/j.issn.0258-7998.223095
中文引用格式: 孫澤,陳息坤,王佳軍,等. 反激變換器開(kāi)關(guān)噪聲抑制策略[J]. 電子技術(shù)應(yīng)用,2023,49(5):111-114.
英文引用格式: Sun Ze,Chen Xikun,Wang Jiajun,et al. Switching noise suppression strategy for flyback converter[J]. Application of Electronic Technique,2023,49(5):111-114.
Switching noise suppression strategy for flyback converter
Sun Ze,Chen Xikun,Wang Jiajun,Zhang Kesong
(School of Mechatronic Engineering and Automation , Shanghai University, Shanghai 200444, China)
Abstract: The flyback converter topology is mostly used for low-power power supply, and in the case of high-voltage input, switching voltage spikes of power devices have become more serious, and even cause the chip to fail to work normally. In this paper, the generation mechanism of flyback converter noise is analyzed in detail. Combined with transformer leakage inductance regulation and converter load conditions, the output voltage spikes can be suppressed. Secondly, using the characteristics of TL431 and optocoupler converter, a variable compensation network is designed to compensate system performance degradation caused by leakage inductance change from loop control. Finally, a multi-output flyback power with input 430~650 V, output 10 W is built. The experimental results verify the feasibility and correctness of the design.
Key words : flyback converter;noise suppression;compensation network

0 引言

反激變換器得益于其較少的功率器件及較低的成本,成為并網(wǎng)逆變器、整流器等電力電子系統(tǒng)的輔助電源主流拓?fù)渲?。輔助電源負(fù)載多為控制芯片、驅(qū)動(dòng)芯片等小功率負(fù)載,此類(lèi)負(fù)載對(duì)供電質(zhì)量有較高的要求,隨著電力電子系統(tǒng)輸出功率的提高,反激變換器輸出噪聲及電磁干擾加重,影響系統(tǒng)采樣信號(hào)的準(zhǔn)確性及控制精度,嚴(yán)重時(shí)導(dǎo)致芯片無(wú)法正常工作。

反激變換器輸出噪聲主要來(lái)自于功率器件的開(kāi)關(guān)過(guò)程,強(qiáng)相關(guān)于變壓器漏感,當(dāng)原邊電壓較高時(shí),開(kāi)關(guān)噪聲同樣影響反激變換器自身電流采樣精度,甚至導(dǎo)致反激變換器功率器件的誤導(dǎo)通。



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作者信息:

孫澤,陳息坤,王佳軍,張克松

(上海大學(xué) 機(jī)電工程與自動(dòng)化學(xué)院,上海 200444)


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