| 基于NCP1200开关电源的启动问题分析及改进设计 |
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| 引用本文： | 徐平凡,陈忠仁,梅妮,党三磊. 基于NCP1200开关电源的启动问题分析及改进设计[J]. 通信电源技术, 2009, 26(6): 44-47 |
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| 作者姓名： | 徐平凡 陈忠仁 梅妮 党三磊 |
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| 作者单位： | 1. 中山职业技术学院电子信息工程系,广东,中山,528404
2. 广东电网公司电力科学研究院,广东,广州,510600 |
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| 摘 要： | 基于NCP1200的无辅助绕组反激式开关电源在低压输入时存在启动问题,随着负载的增加以及电路温度的上升,启动问题越严重,较常见的解决方法是添加辅助绕组,由辅助绕组向芯片供电,这虽然解决了启动问题,但是增加了电路的成本和制作工艺,不利于开关电源的小型化。文中首先详细分析了该芯片的启动特性及问题产生的原因,提出了一种可改善启动特性的方法,此方法能有效解决开关电源的启动问题。最后,试制了一台15W/12V输出的反激式电源,并给出了相关电路波形,验证了所提改进方案的可行性。
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| 关 键 词： | NCP1200 反激式 启动 |
Start-Up Analysis and Improved Design of Switching Mode Power Supply Based on NCP1200 |
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| XU Ping-fan,CHEN Zhong-ren,MEI Ni,DANG San-lei. Start-Up Analysis and Improved Design of Switching Mode Power Supply Based on NCP1200[J]. Telecom Power Technologies, 2009, 26(6): 44-47 |
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| Authors: | XU Ping-fan CHEN Zhong-ren MEI Ni DANG San-lei |
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| Affiliation: | XU Ping-fan , CHEN Zhong-ren, MEI Ni, DANG San-lei (1. Zhongshan Polytechnic, Zhongshan 528404, China; 2. Electric Power Research Inst. of Guangdong Power Grid Co. , Guangzhou 510600, China) |
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| Abstract: | When the input voltage is low, there is a start-up problem of non-auxiliary winding flyback switching mode power supply based on NCP1200 and the problem becomes more serious as the temperature rises. A common solution is applying an auxiliary winding, which brings a higher price and more complicated processes for manufactures. In this paper, first the cause of the start-up problem is analyzed in detail and an improved design is proposed. A 15 W/12 V output flyback switching mode power supply is implemented and tested. The test results verify that this improved design is feasible. |
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| Keywords: | NCP1200 |
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