Application: BHFUSE launches a sensor specific Resettable Fuse
時間：2023-07-30 / 瀏覽：737
The emergence of the Internet of Things (IoT) has enabled real-life resources to be integrated with the computer Internet. As the key entry point for IoT technology to collect data, sensors are the basis for the operation of the entire system, and the two complement each other. With the rapid development and popularization of the Internet of Things, the application fields of smart sensors are increasing, such as smart home, smart wear, transportation, power grid, manufacturing, construction, medical treatment, agriculture, etc., and there are more and more sensors applicable to it, including proximity sensors, photoelectric sensors, temperature sensors, pressure sensors, smoke sensors, RF sensors, liquid level sensors, pyroelectric IR sensors, chemical sensors, water quality sensors, gas sensors, medical sensors and automotive sensors.Sensors will inevitably encounter various faults during use, there are many types of sensors, working principles, working methods and characteristics are different, in the event of failure, you need to figure out what type of sensor can be the right medicine. Take proximity switch sensors, photoelectric switch sensors and pressure switch sensors as an example, their conventional wiring has two-wire system and three-wire system, three-wire system is divided into NPN type and PNP type, the wiring method is not the same, take NPN type, N means that the signal end is negative voltage output, the internal switch is connected to the signal end and the negative pole, the load is connected in the middle of the positive power supply VCC and the signal transmission line OUT, if the load current is too large to cause a short circuit, the internal drive triode will be burned, At this time, a PPTC self-recovery fuse can be added for overcurrent protection.PPTC Resettable Fuse, also called polymer positive temperature coefficient thermistor, also known as recoverable fuse, is mainly made of polymer and conductive particles. Under normal temperature conditions, the internal resistance of PPTC is very small and does not affect the normal operation of the product, when excessive current passes, the speed of PPTC generating heat exceeds the speed of its heat dissipation, then the polymer expands and destroys the link between conductive particles, so that the resistance of PPTC rises sharply, thereby limiting abnormal overcurrent. When the current is troubled, the polymer cools and shrinks to its original state and reconnects the conductive particles, and the PPTC returns to the original low-resistance state to rebuild the conductive path.BHFUSE launched the sensor special Resettable Fuse has the following characteristics: low resistance, fast protection, low pressure drop, high temperature resistance, multiple times welding, multiple protection change rate is small, etc., package size is 0603, 0805, 1206, Ihold working current up to 0.05A ~ 0.5A, Vmax working voltage up to 60V, specially designed for sensor overcurrent circuit; In addition, some circuits with driving output need to add PPTC resettable fuses for output current protection to avoid excessive current burning of the triode at the output. PPTC self-recovery fuse perfectly solves the sensor overcurrent protection needs, and compared with the overcurrent chip low cost, with the verification of a large number of schemes, BHFUSE Resettable Fuse can be used with confidence, welcome to buy.
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