5V/1A mobile phone charging circuit adds charging control switch and light indication

IamFan

5V/1A mobile phone charging circuit adds charging control switch and light indication [Copy link]

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I want to modify my mobile phone charger. I will cut off the positive wire of the data cable connecting the 5V/1A Apple mobile phone charger and the mobile phone, add a control switch, and then connect a line downstream of the switch to a resistor and a light-emitting diode. Can I use the added switch to control the charging of the mobile phone, and have the light indicator light up when charging and go out when the power is off?

Please help me solve this problem, thank you!

IamFan

I hope you can help me solve my doubts. Thank you!

chunyang

Yes, it is possible, but it is not necessary. The charging circuit and battery management circuit are inside the phone and are automatically controlled. There is no practical significance in adding a switch manually.

qwqwqw2088

Theoretically, it is possible. When charging, it will lower the battery voltage on the mobile phone.

Apple phones use protocol charging. At the end of charging , when the battery voltage is detected by the protocol, it is normal, such as 4.2V. If it does not affect the battery, it can be charged.

辛昕

Yes, you can, but it doesn't make much sense. But I want to know why you have this idea, is it because you are too lazy to plug and unplug?

In fact, I often have the idea of modifying some things, and I have actually done some of them.

But generally speaking, when I modify something, I never do it just for the boring idea of LED display or manual control.

For example, take your case. To be honest, today's chargers are very advanced, whether it's manual control (just unplug it and it's done) or over-current protection or over-voltage protection - you are not involved.

So I doubt what you are going to do.

Of course, if you just can't help but mess around, well, that's great, great. Cut it~~~ I've used Samsung hair dryers that cost more than 100 yuan to cut hair.

IamFan

chunyang posted on 2020-7-27 14:09 It is possible, but it is not necessary. The charging circuit and battery management circuit are inside the phone and are automatically controlled. There is no need to add a switch manually...

Thank you very much for your reply!

Indeed, this has little practical significance. I mainly want to figure out the feasibility of this. I am not sure whether the charging can be carried out normally in this way.

IamFan

qwqwqw2088 posted on 2020-7-27 15:21 In theory, it is possible. When charging, it will lower the battery voltage on the mobile phone. Apple phones use protocol charging. At the end of charging, that is, trickle charging, the protocol detects that the battery voltage is normal...

Hello, thank you very much for your reply!

I would like to ask you more specifically, if the voltage of the trickle charge at the end of charging is low, will it affect the indicator light? For example, if the switch is not disconnected, but the voltage across the diode is insufficient, the light will not light up, and there will be a problem that the indicator light cannot indicate the switch is on or off.

chunyang

IamFan posted on 2020-7-28 09:59 Hello, thank you very much for your reply! I would like to ask you more specifically, if the voltage of the trickle charge at the end of charging is low, will it affect the indicator light?

The voltage will not change. Note: the power adapter is not a charger. Many people use the same term, so it is not surprising that they misunderstand it.