Thermal Switches Provide Circu
abstract: a pair of temperature switches control a thermal disconnect circuit for system temperature protection. the circuit crowbars the power supply when excessive temperature is detected by the thermal switches.
a temperature sensor can provide an interrupt to a microcontroller when the measured temperature goes out of range. the microcontroller implements the proper protective action when one of the temperature monitors detects an over temperature condition. but sometimes it is easier and more cost effective to simply disconnect the offending circuit from the power supply without getting a microcontroller involved.
multiple temperature sensors are needed when more than one hot spot needs to be monitored. a simple thermal-protection circuit (figure 1) includes two temperature switches (u1 and u2) with active-high outputs. temperature thresholds for these switches are set by resistors r1 and r2, and the switch outputs connect to the inputs of a dual-input or gate (u3). or gates with more than two inputs are available if more than two temperature switches are needed. when excessive temperature drives either input high, the or-gate output is driven high, causing a silicon controlled rectifier (scr) to crowbar the power supply and blow the fuse.
figure 1. this thermal-protection circuit includes a crowbar device (d1) driven by thermal switches u1 and u2.
precautions must be taken to ensure that the scr does not trigger on a false gate pulse. power supply transients can cause a false high signal at the output of the or gate and cause the scr to turn on. once triggered, the scr is not able to turn off, and the fuse will blow. a small rc filter (r3 and c3) suppresses any gate transients that would otherwise turn on the scr.
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Thermal Switches Provide Circu
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a temperature sensor can provide an interrupt to a microcontroller when the measured temperature goes out of range. the microcontroller implements the proper protective action when one of the temperature monitors detects an over temperature condition. but sometimes it is easier and more cost effective to simply disconnect the offending circuit from the power supply without getting a microcontroller involved.
multiple temperature sensors are needed when more than one hot spot needs to be monitored. a simple thermal-protection circuit (figure 1) includes two temperature switches (u1 and u2) with active-high outputs. temperature thresholds for these switches are set by resistors r1 and r2, and the switch outputs connect to the inputs of a dual-input or gate (u3). or gates with more than two inputs are available if more than two temperature switches are needed. when excessive temperature drives either input high, the or-gate output is driven high, causing a silicon controlled rectifier (scr) to crowbar the power supply and blow the fuse.
figure 1. this thermal-protection circuit includes a crowbar device (d1) driven by thermal switches u1 and u2.
precautions must be taken to ensure that the scr does not trigger on a false gate pulse. power supply transients can cause a false high signal at the output of the or gate and cause the scr to turn on. once triggered, the scr is not able to turn off, and the fuse will blow. a small rc filter (r3 and c3) suppresses any gate transients that would otherwise turn on the scr.
美商艾湃AG-750M评测 价格并不便宜
日本服务机器人可做炒饭、甜甜圈与鸡尾酒
英特尔傲腾数据中心级持久内存（AEP）在Redis上的应用实践
！！卖/买 Marconi 2955B 2955B 2955
车用芯片需求大增，价格上涨！台积电和环球晶看好市场商机
Thermal Switches Provide Circu
全自动搬运码垛机器人在食品药品行业中的应用优势
工赋山东 - 浪潮云洲赋能济南特色产业高质量发展
智能家居和智能单品的差别是什么
自主机器人传感的注意事项
华为云数据库 RDS for MySQL 的读写分离，凭什么打破企业数据瓶颈？
湖北加快布局新一代人工智能 加速推动高质量发展
电力电子实时仿真实验室，助力高等教育信息化建设
第三方支付谁更胜一筹？大数据告诉你支付宝和微信到底谁更强？搅局的都走开
荣耀手环4确认9月5日发布
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语音分析已经成为市场精准投放重要手段 北美地区将是最大的市场
直击CES 2024：积木易搭出海品牌3Dmakerpro携系列消费级3D扫描仪及3D扫描仪新品精彩亮相
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