Uudelleensivutettavien sirulakkeiden toiminnot ja sovellukset

Palautettavat sirusulakkeet (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. Seuraavat ovat sen ydinpisteitä:
1. Rakenne ja toimintaperiaate
Materiaalin koostumus
It is composed of specially treated polymer resins (such as PE polymers) ja johtavia hiukkasia (hiilimustaa tai metallihiukkasia). Normaaleissa olosuhteissa, johtavat hiukkaset muodostavat alhaisen resistanssin polun (0.1-useita ohmia). ‌Protection mechanism‌
Kun ylivirtaa esiintyy, virran lämpövaikutus saa hartsin sulamaan ja laajenemaan, 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, johtavat hiukkaset jäähtyvät ja kutistuvat, yhdistä uudelleen, and restore the low-resistance state without manual replacement‌. ‌

PPTC Resettable Fuse AEM Components China Supplier

Chip SMD -uudelleensijoitettavan sulake ja soveltaminen

Chip SMD resettable fuse China supplier

Ylivirtasuojaus:
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.

Itse palautuva:
Toisin kuin perinteiset sulakkeet, 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. Typical application scenarios
Kuluttajaelektroniikka:
Widely used in smartphones, kannettavat tietokoneet, 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.
Autojen elektroniikka:
Used in cars for protecting dashboard electronics, control modules, and entertainment systems from overcurrents.
Telecommunications:
Protects routers, kytkimet, and other communication devices from damage caused by overcurrents, ensuring uninterrupted connectivity.
Industrial Control Systems:
Safeguard electronic control panels, PLC:t (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.
Medical Devices:
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 Kasetin sulakkeet Palautettava sulake

Self-recovery fuse SMD 1206 nSMD025 250MA 16V

1.18V nopeasti toimiva siru SMD 1812 Kasetin sulakkeet Palautettava sulake

4. Selection considerations
Nykyinen vastaavuus: 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, ja 1812/2920 packaging is required for high current scenarios‌;
Ympäristöön sopeutumiskyky: 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: Esimerkiksi, 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 minuuttia) and action current (trigger within 5 minuuttia) and other indicators.

Advantages over traditional fuses:
Itse palautuva:
Eliminates the need for manual fuse replacement, reducing downtime and maintenance costs.
Kompakti koko:
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.