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BQ27426: DSG Current Threshold CHG Current Threshold Quit Current Taper Rate这几个数值之间的关

Part Number: BQ27426
Other 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。