Part Number:BQ27426Other Parts Discussed in Thread:BQ25611D
DSG Current Threshold CHG Current Threshold Quit Current Taper Rate这几个数值之间的关系
我再相关技术文档中看到下面两种描述
1. Dsg Current Threshold 判断是否处于放电的电流阈值,一般低于系统最小负载电流,但要高于 Quit Current
2.Dsg Current Threshold 设置在系统正常工作最小电流,不是系统待机电流,避免长时间待机小电流影响 average current (average since start of discharge)变得很小,导致负载预估偏小。
这里的最小负载电流和正常工作最小电流怎么定义呢?我们是系统工作+屏幕电量正常电流约为700mA,待机电流约为10-12mA.
我们电池是6000mAh,充电IC使用BQ25611D,截止充电电流默认为180mA,Taper rate约为300
那么技术文档中大小关系前后矛盾呢。
The discharge current threshold can be calculated as Design Capacity/(Dsg Current Threshold × 0.1). The default is effectively C/16.7.——–167
The charge current threshold can be calculated as Design Capacity/(Chg Current Threshold × 0.1). The default is effectively C/10.—————100
The quit current threshold can be calculated as Design Capacity/(Quit Current × 0.1). The default is effectively C/25.———————————250
其它与电流相关参数可跟据需要设置,一般应使 Deadband < Hibernate I <Sleep Current < Quit Current < DSG Current Threshold, CHG Current Threshold < Taper Rate。
Star Xu:
您好,下面是用默认的参数计算得到的值。
The discharge current threshold=C/16.7=6000/16.7=359mA
The charge current threshold=C/10=6000/10=600mA
The quit current threshold=C/25=6000/25=240mA
,
user5861803:
但是这个值不满足CHG Current Threshold < Taper Rate
,
user5861803:
是否可以留个电话沟通一下呢?
,
Star Xu:
您好,截止电流150mA,需要加上15%=172.5mA,这时可以计算C rate=6000/172.5=34.7h, Taper rate =347(0.1h)
TRM 上默认的值都是100(0.1h)应该不用CHG Current Threshold < Taper Rate
非常抱歉,暂时没有电话支持服务。