再セット可能なチップヒューズの関数とアプリケーション

リセッタブルチップヒューズ (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. 以下はそのコアポイントです:
1. 構造と動作原理
‌材料構成‌
It is composed of specially treated polymer resins (such as PE polymers) と導電性粒子 (カーボンブラックまたは金属粒子). 通常の条件下, 導電性粒子が低抵抗パスを形成 (0.1-数オーム). ‌Protection mechanism‌
過電流が発生した場合, 電流の熱効果により樹脂が溶けて膨張します。, 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, 導電性粒子が冷えて収縮する, 再接続する, and restore the low-resistance state without manual replacement‌. ‌

PPTC Resettable Fuse AEM Components China Supplier

CHIP SMD再セット可能なヒューズの機能とアプリケーション

Chip SMD resettable fuse China supplier

過電流保護:
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.

自己リセット:
従来のヒューズとは異なります, 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. 典型的なアプリケーションシナリオ
家電:
Widely used in smartphones, ラップトップ, テレビ, 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.
カーエレクトロニクス:
Used in cars for protecting dashboard electronics, control modules, and entertainment systems from overcurrents.
Telecommunications:
Protects routers, スイッチ, and other communication devices from damage caused by overcurrents, ensuring uninterrupted connectivity.
Industrial Control Systems:
Safeguard electronic control panels, PLC (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 カートリッジヒューズ リセッタブルヒューズ

Self-recovery fuse SMD 1206 nSMD025 250MA 16V

1.1A 8V Fast Acting Chip SMD 1812 カートリッジヒューズ リセッタブルヒューズ

4. 選択に関する考慮事項
‌電流マッチング‌: 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, そして 1812/2920 packaging is required for high current scenarios‌;
environmental adaptability‌: 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: 例えば, 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 分) and action current (trigger within 5 分) and other indicators.

Advantages over traditional fuses:
自己リセット:
Eliminates the need for manual fuse replacement, reducing downtime and maintenance costs.
Compact Size:
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.