Funkcije in aplikacije varovalk za ponovno namestitev

Ponastavljive varovalke čipov (Pptc) are overcurrent protection components based on the positive temperature coefficient characteristics of polymers. They have an automatic reset function and are widely used in circuit protection of electronic equipment. Sledijo njene temeljne točke:
1. Načelo strukture in delovanja
‌Materialna sestava‌
It is composed of specially treated polymer resins (such as PE polymers) in prevodni delci (ogljikovi črni ali kovinski delci). V normalnih pogojih, prevodni delci tvorijo pot z nizko odpornostjo (0.1-več ohmov). ‌Protection mechanism‌
Ko pride do prekomernega toka, Toplotni učinek toka povzroči, da se smola tali in razširi, the conductive network to break, and the resistance suddenly increases to a high-resistance state (up to megohms), limiting the current to microamperes. ‌After the fault is resolved, prevodni delci se ohladijo in skrčijo, ponovno povezati, and restore the low-resistance state without manual replacement‌. ‌

PPTC Resettable Fuse AEM Components China Supplier

Funkcija in uporaba varovalke za ponovno naselitev čipa SMD

Chip SMD resettable fuse China supplier

Zaščita pred pretokom:
Resettable fuses limit excessive current flow in a circuit, preventing damage to sensitive components during short circuits or overload conditions.

Over-temperature Protection:
They can also sense and respond to excessive temperatures, tripping to a high-resistance state to prevent overheating and potential damage.

Samoresitacija:
Za razliko od tradicionalnih varovalk, resettable fuses automatically return to their low-resistance state once the fault condition is removed and the temperature or current drops below the trigger point.

2. Key parameters and characteristics

3. Tipični scenariji uporabe
Zabavna elektronika:
Widely used in smartphones, laptops, TVs, and other electronic devices to protect against overcurrents and over-temperature issues.
Power Supplies:
Provide reliable protection for power supplies in various devices and systems, preventing damage from short circuits or excessive current draw.
Automotive Electronics:
Used in cars for protecting dashboard electronics, control modules, and entertainment systems from overcurrents.
Telecommunications:
Protects routers, stikala, and other communication devices from damage caused by overcurrents, ensuring uninterrupted connectivity.
Industrial Control Systems:
Safeguard electronic control panels, PLCs (Programmable Logic Controllers), and other critical components in industrial settings.
Aerospace and Nuclear Applications:
Provide reliable protection in environments where fuse replacement is difficult or impractical.
Medicinske pripomočke:
Can be found in some medical devices, ensuring the safety and reliability of critical medical equipment.
Audio Systems:
Protects loudspeakers, especially tweeters, from damage due to overdriving.

P075 Fuses 0.75A 13.2V Fast Acting Chip SMD 1812 Kartušne varovalke Ponastavljiva varovalka

Self-recovery fuse SMD 1206 nSMD025 250MA 16V

1.18V hitro delujoči čip SMD 1812 Kartušne varovalke Ponastavljiva varovalka

4. Selection considerations
Trenutno ujemanje: The maintenance current should be 1.25 times higher than the maximum operating current of the circuit‌;
‌Package selection‌: Select 0402/0603 and other sizes according to the PCB space, in 1812/2920 packaging is required for high current scenarios‌;
‌ -okoljska prilagodljivost‌: The current usage needs to be reduced in high temperature environments to avoid false triggering‌.

5. Technology development trends
‌Material optimization‌: New nano-composite materials improve response speed and pressure resistance‌.
‌Structural innovation‌: Na primer, YAXUN Electronics’ adjustable patch components are suitable for different circuit layouts‌.

If you need a test standard, you can refer to the 25°C environment to verify the maintenance current (no action for 15 minut) and action current (trigger within 5 minut) and other indicators.

Advantages over traditional fuses:
Samoresitacija:
Eliminates the need for manual fuse replacement, reducing downtime and maintenance costs.
Kompaktna velikost:
Resettable fuses are often smaller than traditional fuses, making them easier to integrate into compact electronic devices.
Longer Lifespan:
Capable of withstanding numerous overcurrent events, leading to a longer overall lifespan compared to traditional fuses.
No Arcing:
Resettable fuses do not produce sparks or arcing during a fault, enhancing safety.