【应用】自恢复型保险丝PTC 16R600G应用于车载加热杯电源部分,跳闸快速,安全无铅
车载电热杯是一种利用车辆上现有的电源系统进行加热的全新产品,符合中国甚至全球的生活习惯,可以用来烧开水、泡方便面、煮鸡蛋、沏茶、泡咖啡、泡牛奶等,一切都可在路途中轻松解决,既节约了时间,减少开销,也减少了去路边店的次数。下图是车载加热杯电源部分:
图1 加热杯电源部分
该部分的作用是给加热片供电以及将车载电源转换为5V电源给主控MCU供电。车载加热杯的主要功能是开机后发热片通电加热,用NTC实时监控发热片温度,一开始全电压输出,快达到60℃时,PWM输出加热,使杯内温度控制在60℃。
本文主要是给电源部分选择合适的保险丝。鉴于加热杯属于消费电子类产品,选择熔断型保险丝会增加售后成本,所以推荐选择PTC自恢复型保险丝。从加热杯的主要功能可以得知,工作温度为60℃左右。下图为LITTELFUSE的16R系列PTC各型号在不同的工作环境温度对应的保持电流:
图2 16R系列PTC各工作环境温度下的保持电流
从图1可知工作电流为4A,保险丝的保持电流应略大于工作电流,在60℃的工作温度下,16R600G较为合适。16R600G的工作电压为16V,也满足电源电路工作电压为12V的条件。且在正常工作状态下,电阻仅为0.028欧姆,对电路影响小。
使用littelfuse的16R600G应用在车载加热杯上有以下优点:
1.符合RoHS标准,无铅
2.快速跳闸时间,安全有效的保护后级电路
3.减少售后成本
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X1LX2X3 series PTC Thermistor (TÜV) Certificate (R 50119118)
型号- 0805L020X4X5,1812L050XXYYYYY,0603L008XXYYYYY,0603L10PSLXXYYYYY,1206L020XXYYYYY,1206L112XXYYYYY,1210L110XXYYYYY,1206L400SL-SXXYYYYY,1206L116XXYYYYY,1206L112S 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可定制温度范围-230℃~1150℃、精度可达±0.1°C;支持NTC传感器、PTC传感器、数字式温度传感器、热电堆温度传感器的额定量程和输出/外形尺寸/工作温度范围等参数定制。
提交需求>
可定制车规级电感的电流范围0.3~17.9A,尺寸最小1x0.55x0.5mm到最大12.5x12.5x6mm,工作频率100KHz~2MHz,感值范围:0.47uH~4.7mH。符合IATF16949和AECQ-200。SPQ为5K。
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