LED燈泡放多久會超過「保存期限」?

作者 : John Dunn,EDN專欄作者

傳統的白熾燈泡只要小心地收好,就可以存放多年;LED燈泡可不一樣,買來後不能直接擱置在某處的架子上,然後把它遺忘多年...

前幾天,家中一顆還很新的LED燈泡忽然變暗了,由於它的外殼似乎是採用某種對人體無害的塑料製成的,我決定拆解這顆燈泡,看看是否能找出它故障的原因(圖1)。

我們之前曾經討論過電解電容可以安全存放多久的時間。對這顆LED燈泡,我也有了這樣的疑問。

這顆燈泡中裝載著一大堆電子元件,真的讓人印象深刻。除了圓盤上那32顆LED外,還有一塊電路板,原來是一個恆定電流開關模式驅動器。

 

annotated photo of a disassembled LED light bulb

圖1:動手拆解LED燈泡,看看內部有哪些電子元件。

 

這讓我瞭解到的第一件事是,即使在我們當地的電子回收服務並不收這些物品,但等到這些東西壞了應該設法進行回收。其次,我還發現其中有一個鋁電解電容。這算是增加了新的知識。

美國知名的類比IC設計工程師Robert Pease曾經在文中提到並不滿意俗稱「省電燈泡」的小型螢光燈(compact fluorescent lamp;CFL)。儘管後來也只好接受了,但由於一開始並不滿意,以至於他一口氣買了一百個100W的白熾燈泡備用。這些燈泡就這樣貯藏起來了,就算持續很多年也不會有問題。

我也有一些像這樣的東西。在我的地下室中存放著一些燈泡,這些燈泡的年紀大概可以追溯到我成年時期,如今,我已經七十多歲了。今天一想到那些「古董」燈泡,馬上毫不猶豫地拿出來裝進檯燈中開始使用。

但是,就像剛拆開的那顆閒置許久的LED燈泡,其儲存壽命受到了鋁電解電容存放壽命的限制…

…繼續閱讀請連結EDN Taiwan網站

 

 

 

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