電源供應器起火 - 3C

By Tom
at 2014-07-29T21:57
at 2014-07-29T21:57
Table of Contents
剛下班,來回覆一下。
http://imgur.com/a/LRYE4
圖一:拆機待檢(不好意思,測試平台通常很忙,沒時間整理零件設備)
圖二:EE RD測量中(左下角就是RA系列的線路圖...)
圖三:燒毀的位置。
目前這一台燒毀的黑騎士450W已經回到廠內,由EE RD進行一對一的分析中。
初步了解,燒毀的部份是5V Stand By的保護元件,
RD會一步步從一次側檢查過去(從AC->Stand By-> PFC->主電源/大電容->Mosfet)
但要花一點時間做「重現」(複製並找出問題發生的原因),
我希望可以在短時間內回答ilovekr兄所提出的問題,
會繼續update進度給關心此事件的大家。
不過現在可以回答的,我就一一寫在下面:
1) 「沒開機不代表PSU不通電」:
我想大家最大的疑慮在於「插著沒通電就會燒」這件事情上,
不過根據intel的design guide,當你插著電源線、打開I/O開關時,
機子內就會有5V的迴路通電,等著MB發出PS_ON的訊號叫醒PSU,
這就是所謂的Stand By電源(紫色線)。
這組迴路會讓PSU保持在特定的電壓下,當PS_ON訊號送出時,
5V Stand By會將PSU內連接上的各組功能IC,以VCC訊號「喚醒」(也就是啟動)。
當然,在ilovekr兄此案例內,5V Stand by的保護元件被擊穿,
這是主要需要找出問題的地方。
2) 「二次側功能正常」:
目前RD測試,二次側輸出保持正常
(在RA系列內,就是3.3V/5V/12V輸出跟同步整流這一塊),
線材、膠殼沒有燒毀痕跡,
這也是其他零件(主機板/CPU/記憶體等等)沒有損傷的主因。
回到「不通電就起火」這個問題,這是我個人覺得有必要讓品管來看的主因。
因為從公司運作以來,從來沒聽說過「沒通電會燒毀」這種情況,
狀況罕見,所以不找人來看並且解開問題,我會渾身難過,
那也是我大陣仗烙了一堆人到原價屋的原因...XD
一般而言,電源供應器如果元件故障導致板上特定區域電壓/電流升高,
所有保護元件都會在第一時間內發揮作用,
如果一次側的5V Stand By燒毀,二次側元件卻正常,
那表示這幾道關卡有發揮它應該發揮的作用。
但如果外力的力量太強(AC輸入端瞬間電流、電壓過高),
超過元件負荷的範圍,我想任何情況都有可能發生。
最後,產品在PCB Layout的階段,
每個元件Layout處,都有保留Test Pin的設計,
我想,當RD把一次側的元件檢查完畢,一一查線量測訊號,答案應該就不遠了。
還請大家繼續關心留意此案後續,謝謝。
※ 引述《ilovekr ( )》之銘言:
: 然後將電源供應器分解,打開後正如上次圖片所示,那個地方有一個明顯的燒焦痕跡
: 經現場三位資深品管RD表示,起火位置是保護裝置元件,起火原因是瞬間過大電流或電壓
: 導致元件電阻負荷不了起火
: 至於起火後是否會造成更嚴重的後果
: 1.RD表示電源供應器設計有符合防火材質的規範,不容易本身自身燒起來,事實上燒過痕跡
: 也侷限在那個位置,附近其他也沒有明顯的燒黑痕跡(包含膠帶)
: 2.起火點在保護裝置,RD表示保護裝置有起到保護作用,在瞬間過大電流或電壓起火後
: 沒有繼續送電,不會有沿著電源各條供電線燒至主機內
: 接下來我的疑問在,既然保護裝置設計時就已經預定是要承受大電流或大電壓
: 那怎麼會這麼輕易的自己燒起來?
: 全漢表示,這部份可能是遇到元件本身不良導致,詳細原因他們要回去查證
: 原價屋李大哥換上測試用電源送電,可以開機進入bios
: 結論:電源供應器安心上路,其他零件正常
--
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