Application scenarios of self recovering fuses: Self recovering fuses, also known as PPTC. Its full name is positive temperature coefficient thermistor. I remember it is different from traditional fuses. Traditional fuses need to be replaced after melting, while self recovering fuses can be restored by themselves after troubleshooting, so they can be reused. Where exactly is it used?

Firstly, it may be in electronic devices such as computers and mobile phones that protect circuits from overcurrent or overheating. For example, the USB interface may have overcurrent protection to prevent short circuits from damaging the device. In addition, for battery pack applications, such as lithium batteries, if the current is too high during charging or discharging, PPTC can cut off the circuit and restore it after the temperature drops, making the battery safer.

There is also automotive electronics, where the circuit system is quite complex and may include motors, sensors, etc. PPTC can protect these components. For example, electric windows, ABS systems, or car chargers to prevent overload or short circuits. In addition, motors, power supplies, and controllers in industrial equipment may require such recoverable protective components to avoid production interruptions.

Consumer electronic products such as televisions, speakers, and game consoles also require overcurrent protection in their internal circuits, and PPTC can automatically restore them, reducing maintenance costs. Communication devices such as base stations, routers, and switches operate continuously, and PPTC can prevent faults caused by abnormal current while reducing maintenance requirements. In terms of household appliances, PPTC can improve the safety and reliability of motors or control boards in air conditioners, refrigerators, and washing machines.

Lighting systems such as LED lights may burn out the LED due to excessive current. PPTC can protect the circuit and extend its lifespan here. Medical equipment requires high reliability, and PPTC can provide protection without affecting the operation of the equipment. Finally, security systems such as cameras and alarms need to work continuously, and PPTC prevents power issues from causing equipment damage.

However, are there any other possible application scenarios? For example, electric tools, drones, or solar energy systems? Or is it a power adapter, power bank, or the like? We need to confirm whether these belong to the mentioned categories. Additionally, are the response time and rated current and voltage of PPTC suitable for these scenarios? For example, high-power devices may not be suitable because PPTC has limited current limiting capabilities and may only be suitable for low to medium power applications.

Also, the working principle of a self-healing fuse is based on the sudden increase in resistance caused by temperature rise, thereby limiting the current. So in situations where quick disconnection is needed, it may not be as fast as traditional fuses, but it is more suitable in scenarios where it can be automatically restored. For example, for devices that repeatedly experience brief overcurrent, using PPTC is better and does not require frequent replacement.

Does the possible application scenario cover most of the requirements for electronic circuit protection? Are there any exceptions? For example, in high-pressure or extreme temperature environments, is PPTC applicable? It may be necessary to consider its operating temperature range and pressure resistance. For example, in the high-temperature environment of a car, can PPTC work properly?

To summarize, the application scenarios mainly include electronic devices, batteries, automotive electronics, industrial equipment, consumer electronics, communication, home appliances, lighting, medical, security, etc. Specific examples are needed to support each scenario, such as USB interfaces, lithium battery packs, in car electronics, LED drivers, etc.