1. The working voltage of high brightness LEDs for lighting is about 3.2V and the working current is about 100mA. If you connect it directly to a charger, the LED will turn off quickly.
2. No.
No. The reasons are the same as above
3. Not necessarily. If you use a transformer to charge or a switching power supply circuit to charge, you can basically use the LED while charging, but for a simple constant current charging circuit that uses a capacitor to limit the current (this is (i.e. the common cheap rechargeable flashlight internal charging circuit), it should not be charged with the lights on.
I have 12 5050 SMD LED lights and I want to use a 3.7V lithium battery as the power source; the lights should be usable when charging at 5V and not burn out! I hope you can provide me with thecircuit diagram
I modified a lot of it!
I suggest you buy a charging module and a discharge protection module first!
The original circuit board of the desk lamp should be removed, and the remaining resistance should be 6Ω or 2Ω, which is the best voltage reduction resistance!
The charging module is installed on the original power port!
I also replaced the switch (you can also use the original one) because it cannot be used while charging! ! !
The discharge protection module is soldered in front of the LED lighting power supply.
5V--CE3210, charge the battery:
, then connect the battery here:
LED structure: 3 strings 4 And. Total current = 4*0.06 = 0.24 A. RS resistance is 0.095/0.08=0.395 ohms.