行動電源小常識 - Android

By Margaret
at 2012-03-21T14:48
at 2012-03-21T14:48
Table of Contents
事前聲名
此文內文皆由網路尋找 收集而成 作者轉貼到不可考了 本人並無著作權
本文之內容不盡正確 僅供參考 若要來場專業的解釋我想也聽不懂
但可以參考版上幾位大大的文章 #1G-s-1pF <--此為目前最專業
先學會電學中的幾個名詞解釋會有助於下面的課程。
V = 伏特 (即為電壓的國際單位)
A = 安培 (即為電流的國際單位)
mAH = 電池容量
另外要提的是電流是由電壓高往電壓低流動。
主題1: 內文取於ptt 感謝ptt版友 文號 #1G-rwHaa
怎麼看行動電源的真實充電量?
以5000mAH的行動電源來說因為裡面都是鋰電池
基準電壓都是3.7V 但是當要充電時必須升壓至5V
因此安培數會有所變動
算法如下
5000(mAH) X 3.7(V) / 5(V) = 3700(mAH)
這3700才是真正能充入電池中的量
用這數字來除電池電量得到的次數才會"較"正確
為什麼說"較"呢? 因為3700是理論值
這充電還要經過轉換經過傳輸線 都會耗損
加上很多人充手機都是開機狀態 雖然關螢幕但一樣會耗電
因此充電電量幾乎都是低於理論值...
所以結論就是5000mAH的行動電源 要用3700mAH去算
S2電池電量是1650mAH
3700/1650=2.2X
理論上來說關機狀態下可以充飽S2兩顆電池
但要注意的是 人都會說:
為什麼5000-3700=1300我剩下來的1300會去那了。
這個問題是在3.7V中跟5V中做的換算可以相減是沒有意義的。
這就跟 你說1元美金跟30元台幣 他們相差了 29元去那一樣沒意義
主題 1.1
推 mario3845:因為跑到電池裡面的電壓還是5v→3.7v阿.... 04/18 08:41
→ mario3845:3.7v > 5v > 3.7v 04/18 08:42
→ mario3845:X mah *3.7/5 = Y mah → Y mah*5/3.7 = Zmah 04/18 08:43
→ mario3845:之所以不同是因為兩次轉換的損耗,能有七成就偷笑了... 04/18 08:45
主題2:
行動電源能充什麼東西?
理論上所有的電源都是可以轉換的可是主要的問題在 “V” 也就是伏特數
大致上的行動電源都是5V的輸出,所以只要輸入是大於5V的就無法充電
跟上面前提說的一樣電壓要高於輸入才可以充電。
所以平板只要是輸入是5V的就可以充,但筆電通常都是9V~12V的輸入會使的行動電源無法
充入。市售已有可以調整電壓的行動電源。
主題3:
為什麼行動電源有貴的有便宜的?
如上述行動電源在輸出時需要做從3.7V升壓至5V才輸出的這個動作,這個電路板的製作雖
然簡單但做出來品質好不好就不一定了,做的好在防消耗功率可以控制在90%以上,但做
的不好就有可能消耗到70%。
所以一般而言5000mAH換算只有3700再加上消耗的功率3700*0.9=3330
以SII來說剛好換兩顆電池。
主題4:
為什麼我的行動電源無法將平板充滿電?
如上述如果平板電池容量是7000mAh而行動電源也是7000Mah,此時在轉換時行動電源的實
際輸出只有5V下的5180mAH所以在關機時可以充入約莫74%左右的電力,但如果在開機狀態
還要去扣掉原本待機的耗電量。
主題5:
我的行動電源是1A輸出的充在2A需求的平板會不會有問題?我的2A輸出的充電器充1A需求
的手機會不會燒掉呢?
兩者都不會有問題,充電器標示的2A是指”最大電流量2A”,所以如果就算是拿100A的來
充他也只是抽取1A的電流量不會燒掉的。
1A的充電量充在2A的平板上,只是會變的充的比較慢,而且如果您正在使用可能會發生,
充來不及用的情形。
--
此文內文皆由網路尋找 收集而成 作者轉貼到不可考了 本人並無著作權
本文之內容不盡正確 僅供參考 若要來場專業的解釋我想也聽不懂
但可以參考版上幾位大大的文章 #1G-s-1pF <--此為目前最專業
先學會電學中的幾個名詞解釋會有助於下面的課程。
V = 伏特 (即為電壓的國際單位)
A = 安培 (即為電流的國際單位)
mAH = 電池容量
另外要提的是電流是由電壓高往電壓低流動。
主題1: 內文取於ptt 感謝ptt版友 文號 #1G-rwHaa
怎麼看行動電源的真實充電量?
以5000mAH的行動電源來說因為裡面都是鋰電池
基準電壓都是3.7V 但是當要充電時必須升壓至5V
因此安培數會有所變動
算法如下
5000(mAH) X 3.7(V) / 5(V) = 3700(mAH)
這3700才是真正能充入電池中的量
用這數字來除電池電量得到的次數才會"較"正確
為什麼說"較"呢? 因為3700是理論值
這充電還要經過轉換經過傳輸線 都會耗損
加上很多人充手機都是開機狀態 雖然關螢幕但一樣會耗電
因此充電電量幾乎都是低於理論值...
所以結論就是5000mAH的行動電源 要用3700mAH去算
S2電池電量是1650mAH
3700/1650=2.2X
理論上來說關機狀態下可以充飽S2兩顆電池
但要注意的是 人都會說:
為什麼5000-3700=1300我剩下來的1300會去那了。
這個問題是在3.7V中跟5V中做的換算可以相減是沒有意義的。
這就跟 你說1元美金跟30元台幣 他們相差了 29元去那一樣沒意義
主題 1.1
推 mario3845:因為跑到電池裡面的電壓還是5v→3.7v阿.... 04/18 08:41
→ mario3845:3.7v > 5v > 3.7v 04/18 08:42
→ mario3845:X mah *3.7/5 = Y mah → Y mah*5/3.7 = Zmah 04/18 08:43
→ mario3845:之所以不同是因為兩次轉換的損耗,能有七成就偷笑了... 04/18 08:45
主題2:
行動電源能充什麼東西?
理論上所有的電源都是可以轉換的可是主要的問題在 “V” 也就是伏特數
大致上的行動電源都是5V的輸出,所以只要輸入是大於5V的就無法充電
跟上面前提說的一樣電壓要高於輸入才可以充電。
所以平板只要是輸入是5V的就可以充,但筆電通常都是9V~12V的輸入會使的行動電源無法
充入。市售已有可以調整電壓的行動電源。
主題3:
為什麼行動電源有貴的有便宜的?
如上述行動電源在輸出時需要做從3.7V升壓至5V才輸出的這個動作,這個電路板的製作雖
然簡單但做出來品質好不好就不一定了,做的好在防消耗功率可以控制在90%以上,但做
的不好就有可能消耗到70%。
所以一般而言5000mAH換算只有3700再加上消耗的功率3700*0.9=3330
以SII來說剛好換兩顆電池。
主題4:
為什麼我的行動電源無法將平板充滿電?
如上述如果平板電池容量是7000mAh而行動電源也是7000Mah,此時在轉換時行動電源的實
際輸出只有5V下的5180mAH所以在關機時可以充入約莫74%左右的電力,但如果在開機狀態
還要去扣掉原本待機的耗電量。
主題5:
我的行動電源是1A輸出的充在2A需求的平板會不會有問題?我的2A輸出的充電器充1A需求
的手機會不會燒掉呢?
兩者都不會有問題,充電器標示的2A是指”最大電流量2A”,所以如果就算是拿100A的來
充他也只是抽取1A的電流量不會燒掉的。
1A的充電量充在2A的平板上,只是會變的充的比較慢,而且如果您正在使用可能會發生,
充來不及用的情形。
--
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Android
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