反激变换器开关噪声抑制策略
2023年电子技术应用第5期
孙泽,陈息坤,王佳军,张克松
(上海大学 机电工程与自动化学院,上海 200444)
摘要:多用于小功率辅助电源的反激变换器拓扑,功率器件的导通及关断噪声在高压输入的情况下更加严重,甚至导致芯片无法正常工作。首先分析了反激变换器噪声的产生机理,通过控制变压器漏感,结合变换器负载条件以抑制输出导通噪声;其次,利用TL431及光耦变换器特性,设计可变补偿网络,从环路控制方面补偿漏感变化造成的系统性能降低;最后,搭建输入430 V~650 V,多路输出共10 W的反激辅助电源,实验结果验证了设计的可行性与正确性。
中图分类号:TN86
文献标志码:A
DOI: 10.16157/j.issn.0258-7998.223095
中文引用格式:孙泽,陈息坤,王佳军,等. 反激变换器开关噪声抑制策略[J]. 电子技术应用,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.
文献标志码:A
DOI: 10.16157/j.issn.0258-7998.223095
中文引用格式:孙泽,陈息坤,王佳军,等. 反激变换器开关噪声抑制策略[J]. 电子技术应用,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
反激变换器得益于其较少的功率器件及较低的成本,成为并网逆变器、整流器等电力电子系统的辅助电源主流拓扑之一。辅助电源负载多为控制芯片、驱动芯片等小功率负载,此类负载对供电质量有较高的要求,随着电力电子系统输出功率的提高,反激变换器输出噪声及电磁干扰加重,影响系统采样信号的准确性及控制精度,严重时导致芯片无法正常工作。
反激变换器输出噪声主要来自于功率器件的开关过程,强相关于变压器漏感,当原边电压较高时,开关噪声同样影响反激变换器自身电流采样精度,甚至导致反激变换器功率器件的误导通。
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作者信息:
孙泽,陈息坤,王佳军,张克松
(上海大学 机电工程与自动化学院,上海 200444)
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