bq2970x手册中只有充电过电流检测的电压值,这个电压值跟充电过电流值之间的换算关系是什么?请大虾帮忙解答!谢谢!
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过电流检测的电压值等于过电流值x外部两个MOS管RDSON值。
Based on the information of the total ON resistance of the two switches, determine what would be the Charge
Overcurrent Detection threshold, 14.3 mΩ × 4.5 A = 65 mV. Selecting a device with a 70-mV trigger threshold
for Charge Overcurrent trigger is acceptable.
充电电流主要跟你的电池的电压有关系,如果电压较低,可能处于恒流阶段,那么充电电流可能就是1A,但是如果电池电压已经较高了,进入了恒压阶段,那么电流大小就有内部来影响了。
我现在应该还是处于恒流状态,因为电池电压不到3.9v。不加保护板时的充电电流应该是正常的,为什么加了保护板会使充电电流降低不少?
我在我的设计中也发现这个问题,可能是由于MOS管的内阻在3.7V左右时的大于7mOhm造成的