【应用】电饭煲盖锁采用力特带位置感应簧片开关,可确保盖子牢固锁定到位
电饭煲是用于煮饭的常用器具。这些是依靠适当密封的隔间保持高压的压力锅。如果盖子在闭合时未正确锁定到位,则在电饭煲隔间内产生的高压力足够顶开炊具盖。位置感应盖锁可确保盖子牢固锁定到位。位置感应簧片开关的实物图如图一所示。
图一 位置感应簧片开关实物图
最好的解决方案就是使用位置感应簧片开关作为位置传感器来检测盖子是否关闭到位。
表一 推荐位置感应簧片开关产品,分别是FLEX-14,MDCG-4,MDSM-10,59170,59135,59145
FLEX-14,MDCG-4,MDSM-10,59170,59135,59145位置感应簧片开关特点及优势:
•开关激活不需要物理接触。
•开关触点位于密封的胶囊内。
•防潮、防尘、防异物。
•高工作温度。
•可靠的开关。
•长寿命。
位置感应簧片开关是如何工作的
位置感应簧片开关是一种磁控开关,当在其定义的感应或“激活”范围内没有磁场时,它是常开的。当磁场以适当的校准和足够的强度存在时,位置感应簧片开关的触点将闭合并接通电路。如果磁场被移除,偏离正确的校准,或者强度减弱,位置感应簧片开关的触点将再次打开,断开电路。
图二 位置感应簧片开关应用框图
永久磁铁嵌入在电饭煲盖的手柄内,用于提供磁场以操作位于电饭煲盖内的电子组件内的位置感应簧片开关。当盖子未处于“锁定”位置时,手柄上的磁铁不会与簧片开关对齐,从而保持位置感应簧片开关触点打开。电子控制单元提示盖子没有正确关闭,并将通知用户。只有当手柄处于“锁定”位置时,簧片开关才闭合,并向控制单元发出信号,说明盖子被正确关闭。
图三 电饭煲盖锁位置检测的机械结构
LITTELFUSE提供超越传感器的电路保护解决方案
除了传感器产品,Littelfuse还提供世界上最广泛、最深入的电路保护和电源控制解决方案。
Littelfuse推荐以下产品用于本应用:
表二 电路保护和电源控制解决方案,产品型号为Q60xxxH6,TMOV,LA,UltraMOV,SP1001,SP1003
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