Što je osigurači za čip?

A resettable chip fuse, also known as a PTC (Pozitivan temperaturni koeficijent) resettable fuse, is a type of surface mount device (SMD) that protects electronic circuits from overcurrent and overheating. It acts like a traditional fuse but can automatically reset itself after a fault is cleared. When a fault like an overcurrent or short circuit occurs, the fuse’s resistance increases, limiting the current flow. Once the fault is removed and the fuse cools down, its resistance returns to normal, allowing current to flow again.

PPTC chip self recovery fuse 1210 2A 2.5A 3A 6V 30V 33V 60V SMD

Resettable SMD Fuse 1206 SMD Chip 6V 0.35A (e0113 4c5f1 48d2a d4c5b 1f85e d0afa

SMD osigurači se preseli 1812 16V 2A Površinski nosač čip za zaštitu od prekomjerne struje za komunikaciju

Osigurač čipa koji se može resetirati (PPTC) je prekostrujni zaštitni element koji se temelji na karakteristikama pozitivnog temperaturnog koeficijenta polimera. Ima funkciju automatskog resetiranja i naširoko se koristi u zaštiti krugova elektroničke opreme. Sljedeće su njegove ključne točke:

1. Struktura i princip rada
Sastav materijala
It is composed of a specially treated polymer resin (such as PE polymer) i vodljive čestice (čađe ili metalne čestice). U normalnim uvjetima, vodljive čestice tvore stazu niskog otpora (0.1-nekoliko oma)‌.
‌Protection Mechanism‌
Kada se pojavi prekomjerna struja, toplinski učinak struje uzrokuje topljenje i širenje smole, the conductive network breaks, and the resistance suddenly increases to a high resistance state (up to the megohm level), limiting the current to the microampere level‌.
Nakon otklanjanja kvara, vodljive čestice se hlade i skupljaju, ponovno spojiti, and return to a low resistance state, without the need for manual replacement‌.
PTC Behavior:
Resettable fuses utilize a Polymeric Positive Temperature Coefficient (PPTC) materijal. This material exhibits a significant increase in resistance as temperature rises.

Littelfuse Surface Mount Resettable Fuse China Supplier

LF 1812 Resettable Fuse PPTC 1812L SMD Self-Recovery 0.2A 0.5A 500mA 0.75A 1.1A 1.5A 2A 2.6A 3A 6V 8V 13.2V 15V 24V 30V

Overcurrent Protection Surface Mount PPTC Resettable Fuse 6V 30V 33V 60V SMD

Prekostrujna zaštita:
When a current exceeds the fuse’s rated value flows, the PPTC material heats up, causing its resistance to increase. This increase in resistance reduces the current flow, preventing damage to the circuit.

Automatski reset:
Once the fault is removed and the fuse cools down, the resistance decreases, allowing normal current flow to resume.

Key Features and Benefits:
Samoponovno postavljanje:
The ability to automatically reset after a fault event makes it a reusable alternative to traditional fuses.

Prekostrujna zaštita:
Protects circuits from damage caused by excessive current, short circuits, or overheating.

Space-Saving:
SMD packaging allows for integration into compact electronic devices.
Wide Range of Applications:
Found in various devices, including computers, mobile phones, medicinska oprema, and automotive electronics.

Example:
Imagine a situation where a USB port on a laptop is accidentally short-circuited. A resettable fuse on the USB power line would detect the overcurrent and increase its resistance, limiting the current and preventing damage to the laptop’s power supply and other components. Once the short is removed, the fuse would reset, and the USB port would be ready to use again.