作者：吴志祥1, 高波1, 蒋文贤2, 黄波2
作者单位：1. 常州工学院, 江苏常州 213002;
2. 江苏国星电器有限公司, 江苏常州 213177
关键词：DW450断路器; 欠压脱扣器; 电路设计; SoC系统; 瞬时脱扣; 延时脱扣;
摘要：
针对新一代智能型低压万能式DW450断路器体积明显缩小,且对内嵌电子单元要求更高等特点,设计一种基于SoC(system-on-chip)的高性能欠压脱扣器。在现有DW45电磁型欠压脱扣器的基础上,分析存在的问题,提出基于电容降压、电容充放电的新方案。实验表明:该欠压脱扣器方案整体电路简洁,在78mm30mm35mm的空间里实现瞬时或延时欠压脱扣;动作点准确度达2V,测控电路工作电流仅为0.73mA@5V。为新一代智能型低压万能式DW450断路器提供一种高可靠的小型化欠压脱扣器优选方案。
Research and design of undervoltage release used in DW450 circuit breaker based on SoC
WU Zhi-xiang1, GAO Bo1, JIANG Wen-xian2, HUANG Bo2
1. Changzhou Institute of Technology, Changzhou 213002, China;
2. Jaingsu Guoxing Electrical Co., Ltd., Changzhou 213177, China
Abstract: Considering that the new generation of intelligent DW450 low pressure universal type circuit breaker significantly reduces in size and has higher requirements for the embedded electronic units,a high-performance undervoltage release,based on SoC,has been worked out. On the basis of the problem analysis concerning the existing DW45 type electromagnetic undervoltage release, the paper puts forward a new scheme based on the key technique of capacitance step-down and capacitor charging-discharging. Experimental results show that the whole circuit of the new undervoltage release is concise and capable of realizing the instantaneous undervoltage tripping or delay undervoltage tripping in 78 mm×30 mm×35 mm space. The accuracy of the action point is limited within plus or minus 2 V and the working current of measurement and control circuit is 0.73 mA@5 V only. In short,it provides an optimization scheme of a highly reliable and miniaturized undervoltage release for the new generation of intelligent DW450 low pressure universal type circuit breaker.
Keywords: DW450 circuit breaker; undervoltage release; circuit design; SoC system; instantaneous trip; delay trip
2014, 40(6): 64-67 收稿日期: 2014-4-21;收到修改稿日期: 2014-6-9
基金项目: 常州市知识产权计划项目(CK20122008)
作者简介: 吴志祥(1960-),男,江苏常州市人,副教授,研究方向为电力电子技术、智能电器。
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