关于干电池电压

只看该作者 · 2012-5-19 16:02

想用4节干电池，作为板子供电。
新电池可能电压不止1.5V，这样极限电压为6V的LDO和电压监控芯片，是不是可能损坏？所以就不能用？

还有顺便问问，1号电池的容量有多少？没找到一个统一的说法。

只看该作者 · 2012-5-19 16:08

你问的问题:@，什么叫极限电压？？超过极限电压肯定会出问题。电池的容量，你只要找供应商就可以啊

只看该作者 · 2012-5-19 16:15

:L怪我太随意！
比如ldo，输入电压为一个范围，例如为3.5---5.5v，“absolute maximum ratings..........”，输入电压范围不能超过6V。就这个意思。

只看该作者 · 2012-5-19 16:17

我意思，从经验上，是不是可以心存侥幸，比如新电池的电压可能略高于1.5V，但在这种条件下，器件一般也不会出问题:lol
否则又要换新的器件，要买要折腾，烦啊。。。。。。。。。。

只看该作者 · 2012-5-19 16:48

Maximum ratings
Absolute maximum ratings are used to specify the maximum temperature, voltage, and other limiting conditions
under which a device can be used. The absolute maximum ratings are maximum values for operating and
environmental conditions which apply to all products, and they must never be exceeded, regardless of the
circumstance. We have determined absolute maximum ratings for our products, and as long as a semiconductor
device is used within the ratings, we guarantee its performance and characteristics. When designing a device, it is
necessary for the user of the semiconductor to take into consideration fluctuations in supply voltage, deviations in
components, load fluctuations and environmental changes, and design the device so that the absolute maximum
ratings are not exceeded even under the worst conditions. If the absolute maximum ratings are exceeded, it is
possible that immediate deterioration and / or damage to the semiconductor device may occur, and even if it still
operates, a considerable shortening of its life is likely. Furthermore, semiconductor ratings are not independent
entities. Temperature, voltage, current, and power all are closely interrelated, and none may be exceeded.

只看该作者 · 2012-5-19 17:27

“If the absolute maximum ratings are exceeded, it is possible that immediate deterioration and / or damage to the semiconductor device may occur, “

所以才有以上邪念.....................:L

还是走正道吧，谢谢！

2万 · 2012-5-19 18:05

一般6V电池串只1N4007二极管再供给5V的设备

只看该作者 · 2012-5-20 12:07

新电池可达1.7V，4节就是6.8V，可以加一个7805稳压器，

1万 · 2012-5-20 14:26

国家标准，出厂电池限压1.65V，但是要考虑客户可能买到歪电池，余量稍微留大一点。1号电池容量与放电方式非常有关，国家标准的放电测试都是带的小电阻（因为1号电池本来就是为大电流放电设计的），所以楼主要比照自己的放电方式做修正，可能还需要自己做测试，放电终止电压的选择也很关键，一般是电流越小，终止电压约高。估算的话，南孚碱性电池1号的容量可以按8A*H算。