FIRSTOHM Offered Advanced Welded Spot Of Anti-Surge Wire Wound Resistor

时间： 2023-07-29 来源：Firecomms News

技术问答

The wire wound resistors have been around for more than a half century, they are usually existing in high-power circuit design, but are not suitable for anti-surge applications. The reason is a reliability problem of the solder joint between the alloy wire and the metal cap, when the wire wound resistors are produced, the joint of the welded spot and metal cap may have false welding on the welded spot. Hence, the welded spot will be easily broken when surging across it with huge energy.

Implement

FIRSTOHM realizes the reliability of the welded spot is a key factor to withstand surges. Therefore, FIRSTOHM did some research and avoid this problem. The below pictures show the original welded spot and after implementation:

Original - Traditional wire-wound resistor – Welded spot is not reliable against surge

FIRSTOHM - Improved anti-surge welded spot

SWAT/SWMT: Anti-Surge Wire Wound Fast-Fuse Resistor (MELF Resistor)

Feature

Granted multinational patents.
The enhanced welded spot is reliable against the surge.
Fast-acting fuse device for high-power applications.
Advanced combined anti-surge & fast-fuse structure.
Flameproof multi-layer coating equivalent to UL 94 V-0.
Flameproof feature equivalent to overload test UL 1412.
A thermal fuse to protect against overheating in electronic products.

Reference Design

Structure

Application

Power supply
Charger for mobile phone
LED Lighting
Motor star-up protection
Motor ignition

General Specification

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选型指南 - 光颉科技 - 2024/6/6 PDF 英文下载