BQ76940开启均衡时CELL5、6，CELL10、11电压检测不准

user5049122

Prodigy 250 points

不开启均衡的时候，电压检测是准确的，但是每组之间相邻的两个电芯开启均衡之后（5、6 / 10、11），电压检测有时候就会不准。

尝试了一下几种解决方式，但是问题依旧：

1、将均衡时电流流过的路径线路加宽（电芯--Rc--MOS管），问题依旧

2、将Cc电容尝试改为1nF、10nF、100nF、1uF，问题依旧

3、将VC5、VC5B的线路分开，分别连电芯，问题依旧

请帮忙分析下如何解决？

6 年多前

0 Star Xu 6 年多前

TI__Guru*** 130456 points

The cell measurement does not take place during balancing, but the voltage can take time to settle for cell measurements depending on the input filter component values (Rc and Cc). An example waveform can be found in Figure 5 of this app note: www.ti.com/.../slua775.pdf

If filter settling is the issue, I do not think you can solve this without modifying the hardware. If the voltage variation is small, maybe you could turn off balancing when you are getting close to the OV voltage - one idea for software modification.