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7.5 inch black and white screen Wifi tag does not work when the current consumption mainly comes from two parts: standby, wake up listening. After measurement, 7.5 inch black and white screen Wifi tag standby current is 7.04uA , wake up to listen to the peak current is 80.1 mA. 7.5 inch black and white screen Wifi tag system is set to wake up every 1 second to listen to whether there is wake up data. The capacity of the rechargeable lithium battery is 3000mAh.
1 hour standby power: 0.007x1=0.007 mAh
The above graph is the wake up 30S (including standby and wake up listening)
From the graph, we can see that the peak current of wake-up listening is 80.1mA, and the average current is 105uA=0.105mA.
Using the average current to calculate 1 hour wake up listening power: 0.105X1 = 0.105mAh
This can be calculated:
7.5-inch black and white screen Wifi tag does not work, that is, no communication does not brush the screen, the total power consumption in a year: 0.105X24X365 = 919.8mAh
7.5 inch black and white screen Wifi tag working when the screen refresh once the power.
The above figure shows the power consumption of a screen refresh process:
From the figure you can see that the time to refresh the screen is 6.727s, the peak current is 114mA, the average current is 46.6mA, refresh the screen consumes 326uWh = 0.326mWh, converted into mAhw is: 0.326/3.75 = 0.08693mAh
Or use the average current to calculate the power consumption to refresh the screen for a time: (6.727/3600)X46.6=0.087mAh
The results of the two calculation methods are almost the same.
On average, if you swipe the screen four times a day, the power consumed by swiping the screen in a year:
0.087X365X4=127.02mAh
To summarize, the average screen swiping once a day, the total power consumed in a year:
919.8 (annual standby power consumption) + 127.02 (annual daily brush four times power consumption) = 1046.82mAh
3000mAh battery by 80% - 2400mAh use to calculate; 2400/1046.82 = 2.3 years