有PD3.0? - 手機討論

By Zanna
at 2017-12-15T18:58
at 2017-12-15T18:58
Table of Contents
原本的USB標準裡,VBUS電源就是5V/0.5A或5V/0.9A
這麼小的電流大家都無法接受
而USB並沒有一個標準的方式
可以讓Power Sink(受電端)知道Power Source(供電端)的能力
不管是BC1.2,QC,VOOC,PD,都是為了要解決這個問題
"讓Sink與Source能知道對方的能力並互相配合"
BC1.2提供了最大5V/1.5A
QC2/3提供了9V/12V等更高的電壓,但無法知道電流能力
PD協定則是提供了一個很明確的方式,讓兩端可以溝通
供電端:先提供5V的電力
供電端:我支援5V/3A, 9V/3A, 15V/3A, 20V/2.25A,你要什麼
受電端:我要20V/2.25A
供電端:好的,請稍等。(從5V跳到20V) 你的20V/2.25A已準備好了
這樣的溝通在PD2.0就已經有了
也實作在Apple Macbook與其他的類似的裝置
PD的優勢應該在於,它可以溝通的訊息是目前最多的
譬如說QC雙方只能溝通電壓,但對於電流應該是無能為力
http://www.usb.org/developers/powerdelivery/
這是USB協會網站,可以說是PD的官網
相關的Spec都可以在這裡看得到
目前PD標準有幾個規格:
PD Revision 3.0 Version 1.1 12 January 2017
PD Revision 2.0 Version 1.3 12 January 2017
市面上主要與PD有關的裝置,包括各種Type-C的充電器、配件
大都是PD2.0的,因為它其實就很夠用了
PD R3.0 V1.1最主要的功能有這些
1. Fast Role Swap
以蘋果的這顆 https://goo.gl/4t1qNp
(USB-C Digital AV 多埠轉接器)(以下簡稱轉接器)
它有一個缺點
如果你把Type-C的外部電源插在轉接器上
然後把轉接器插在筆電上面充電
同時在轉接器上插個USB隨身碟傳檔案
這個時候如果把轉接器端的外部電源拔掉
轉接器會斷電,隨身碟的檔案傳輸也會中斷
幾秒後轉接器改由筆電供電,才會重新抓到隨身碟
PD3.0的Fast Role Swap是為了解決這個問題的
在轉接器的外部電源被拔除的很短時間內
另一端的筆電要馬上從Sink(受電者)變成Source(供電者)
讓轉接器的檔案傳輸功能不會中斷
2. PPS Programmable Power Supply
它可以在一定範圍內動態的調整電壓
簡單來說,就是QC3.0做的事情
因為對筆電不是很重要,所以我沒什麼研究XD
其實PD2.0到3.0改的東西很多,不止這兩樣
但大部份好像都還沒那麼急迫
也就是對使用者來說是無感的...
有興趣的話就自己去看spec囉XD
Type-C與PD相關的規格一直都還在改
其實RD還挺痛苦的 orz
--
這麼小的電流大家都無法接受
而USB並沒有一個標準的方式
可以讓Power Sink(受電端)知道Power Source(供電端)的能力
不管是BC1.2,QC,VOOC,PD,都是為了要解決這個問題
"讓Sink與Source能知道對方的能力並互相配合"
BC1.2提供了最大5V/1.5A
QC2/3提供了9V/12V等更高的電壓,但無法知道電流能力
PD協定則是提供了一個很明確的方式,讓兩端可以溝通
供電端:先提供5V的電力
供電端:我支援5V/3A, 9V/3A, 15V/3A, 20V/2.25A,你要什麼
受電端:我要20V/2.25A
供電端:好的,請稍等。(從5V跳到20V) 你的20V/2.25A已準備好了
這樣的溝通在PD2.0就已經有了
也實作在Apple Macbook與其他的類似的裝置
PD的優勢應該在於,它可以溝通的訊息是目前最多的
譬如說QC雙方只能溝通電壓,但對於電流應該是無能為力
http://www.usb.org/developers/powerdelivery/
這是USB協會網站,可以說是PD的官網
相關的Spec都可以在這裡看得到
目前PD標準有幾個規格:
PD Revision 3.0 Version 1.1 12 January 2017
PD Revision 2.0 Version 1.3 12 January 2017
市面上主要與PD有關的裝置,包括各種Type-C的充電器、配件
大都是PD2.0的,因為它其實就很夠用了
PD R3.0 V1.1最主要的功能有這些
1. Fast Role Swap
以蘋果的這顆 https://goo.gl/4t1qNp
(USB-C Digital AV 多埠轉接器)(以下簡稱轉接器)
它有一個缺點
如果你把Type-C的外部電源插在轉接器上
然後把轉接器插在筆電上面充電
同時在轉接器上插個USB隨身碟傳檔案
這個時候如果把轉接器端的外部電源拔掉
轉接器會斷電,隨身碟的檔案傳輸也會中斷
幾秒後轉接器改由筆電供電,才會重新抓到隨身碟
PD3.0的Fast Role Swap是為了解決這個問題的
在轉接器的外部電源被拔除的很短時間內
另一端的筆電要馬上從Sink(受電者)變成Source(供電者)
讓轉接器的檔案傳輸功能不會中斷
2. PPS Programmable Power Supply
它可以在一定範圍內動態的調整電壓
簡單來說,就是QC3.0做的事情
因為對筆電不是很重要,所以我沒什麼研究XD
其實PD2.0到3.0改的東西很多,不止這兩樣
但大部份好像都還沒那麼急迫
也就是對使用者來說是無感的...
有興趣的話就自己去看spec囉XD
Type-C與PD相關的規格一直都還在改
其實RD還挺痛苦的 orz
--
Tags:
手機
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