【应用】机械寿命高达100万次的汽车继电器CMA562TH-S-DC12V-C助力车窗玻璃升降,线圈灵敏度640mW
车窗玻璃升降的实现,是通过主控MCU发送控制指令,控制功率开关,给直流电机接通正、反向电流。让电机进行正向、反向转动,带动玻璃上下移动。采用双继电器做功率开关,是一种低成本的实现方式。这里笔者选用了浙江汇港电器有限公司的汽车继电器CMA562TH-S-DC12V-C,下图是基于CMA562TH-S-DC12V-C控制电机应用参考连接图。
在车窗玻璃升降电机控制上选用CMA562TH-S-DC12V-C,来做为电机电流控制的功率开关,主要基于如下考虑:
1、CMA562TH-S-DC12V-C这个继电器内部有两个完全独立的线圈和单刀双掷开关,线圈高灵敏度,640mW,触点受到的马达冲击电流可达到25A 14VDC,吸合电压<=7.2V,释放电压>=1.2V,线圈额度电源12V,线圈电阻225欧,发热小。下表是其几个重要参数。
2、CMA562TH-S-DC12V-C尺寸小,仅为14*15.4*14.2(mm),符合车规认证。电寿命可达10万次,机械寿命可达100万次,采用回流焊型的焊锡方式,工作环境温度范围为-40℃~+125℃。在车窗玻璃升降电机控制上使用CMA562TH-S-DC12V-C这个继电器,可保证较高的可靠性和长使用寿命。其外形图、接线图、安装孔尺寸如下。
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产品型号
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品类
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触点形式(C/A/U)
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线圈电压(V)
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负载电流(A)
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负载电压(VAC/VDC)
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线圈功率(mW)
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HRS2H-S-DC5V-N
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信号继电器
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2C
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5V
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1A
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120VAC
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200mW
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电子商城
服务
支持定制透气膜的宽度,ePTFE材质,耐温范围-40℃-260℃,防水等级IP67/IP68,具有疏水性(拒水性)和不粘性。
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可定制LAMP LED、 CHIP LED、 PLCC LED、 汽车用车规级LED、COB LED的尺寸/电压/电流等参数,电压1.5-37V,电流5-150mA,波长470-940nm。
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