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| 电流控制型反激变换器控制电路的设计 |
| Design of Control Circuit in Flyback Converter with Current-mode Control |
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| DOI：10.3969/j.issn.1671-5322.2007.03.006 |
| 中文关键词: 反激变换器 相位裕量 开环增益 动态补偿 |
| 英文关键词: flyback converter phase margin open-loop gain dynamic compensation |
| 基金项目: |
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| 中文摘要: |
| 推导了由UC3842电流控制芯片控制的反激变换器的开环传递函数,针对其特点,设计了由稳压管TL431和光耦PC817构成的动态补偿电路,通过设计合理的开环增益保证系统有足够的相位裕量和增益裕量,从而保证系统稳定可靠地工作.实验证明了该补偿取得了较好的控制效果. |
| 英文摘要: |
| In this paper,the open loop transfer function of flyback converter which is controlled by UC3842 is deduced.Based on this transfer function,the feedback loop which is composed of TL431 and PC817 is designed.The open-loop gain of the system is designed owning enough phase margin and gain margin to assure working in stable state.The validity of the compensating scheme has been verified by the experimental results. |
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