| 开关电源的过载保护电路设计 |
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| 引用本文： | 刘雪山,杨静,张鸿儒.开关电源的过载保护电路设计[J].通信电源技术,2009,26(4):45-48. |
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| 作者姓名： | 刘雪山 杨静 张鸿儒 |
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| 作者单位： | 1. 西南交通大学电气工程学院,四川,成都,610031
2. 西南交通大学信息科学与技术学院,四川,成都,610031 |
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| 摘 要： | 基于UC3842的反激式开关电源，文中从原理和实验两方面分析了恒功率控制和恒电流控制的过载保护电路，阐述了各自的特点，并提出了一种适用于短暂过载场合的延时锁定关断过载保护电路，实验证明此电路工作于保护模式时开关元件无开关应力，为高峰值负载电源过载保护电路的设计提供了一种有效的方法。
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| 关 键 词： | 开关电源 打嗝模式 开关应力 锁定保护 |
Design of Over Load Protection Circuit for Switching Mode Power Supply |
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| LIU Xueshan,YANG Jing,ZHANG Hongru.Design of Over Load Protection Circuit for Switching Mode Power Supply[J].Telecom Power Technologies,2009,26(4):45-48. |
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| Authors: | LIU Xueshan YANG Jing ZHANG Hongru |
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| Affiliation: | LIU Xue-shan, YANG Jing, ZHANG Hong-ru (1. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China School of Information Science ＆ Technology, Southwest Jiaotong University, Chengdu 610031, China) |
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| Abstract: | Based on fly-hack converter with UC3842 controlled, overload protection circuits of constant power control and constant current control are analyzed from principle and experiment result. The characteristics of these two overload protection circuits are presented. A kind of timer latch protection circuit used for transient overload is proposed. Experi-ment results verify that switching components do not have switching stress in protection mode, which provides an effective method to design protection circuit for switching mode power supply with high peak load. |
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| Keywords: | SMPS hiccup mode switching stress latch protection |
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