I have a rechargeable LED torch light. When I switch on, the torch light turns on. But if I connect it to the wall socket to charge the battery and while doing so if I turn on the switch, the torch light doesn’t turn on. If i disconnect it from the wall socket then turn on the switch, the torch light turns on.


Why it is not charging and giving light at the same time.

 

Hi,
If the chargeable battery is still charge it will not recharge. First consume till the charge almost to a low level.

2nd you are asking why it is giving light, of course the battery will supply to it.

The builtin charger circuit of your torch light manage to control and monitor your chargeable battery level .

 

It is possible that when the charging connector is inserted into the light unit, it mechanically opens a switch which disables the light.
This is common practice, usually done this way to protect the charger from a current over load as its unable to provide sufficient current to charge and light at the same time.
E

 

Hi,
I was confused as you said rechargeable LED torch light. Maybe you are referring to rechargeable battery to lit the LED.

Because i was surprise to hear such an LED can be charge .Please review your device

 

Maybe the charger is designed to keep the LED off when AC power is present. If that is the case, then when the AC power fails the light would come on automatically. A nice feature.

 

Hi,
I was confused as you said rechargeable LED torch light. Maybe you are referring to rechargeable battery to lit the LED.

Because i was surprise to hear such an LED can be charge .Please review your device

Yes i meant rechargeable battery to lit the LED. Sorry for confusion.

 

Maybe the charger is designed to keep the LED off when AC power is present. If that is the case, then when the AC power fails the light would come on automatically. A nice feature.

No sir, there is a two pin plug, then there is a bridge rectifier, then a rechargeable battery then a switch, resister and the LED light. Noting else is there.

When the plug is connected to the wall socket and the switch is on shouldn't both the battery and the load take power from it?

 

It is possible that when the charging connector is inserted into the light unit, it mechanically opens a switch which disables the light.
This is common practice, usually done this way to protect the charger from a current over load as its unable to provide sufficient current to charge and light at the same time.
E

There is a two pin plug, then there is a bridge rectifier, then a rechargeable battery then a switch, resister and the LED light. Noting else is there.

When the plug is connected to the wall socket and the switch is on shouldn't both the battery and the load take power from it?

 

Most chargers are only 'trickle' chargers, designed to charge a battery over a long period of time, they do not have sufficient power to light the LED.
So the circuit includes a sensor that disable the LED when charging or as I posted earlier regarding some form of mechanical switch.

I repairing a small baby type electric car at the moment, which cannot be operated while the battery is being charged.
Inside the two pole charge connector socket is a lever which disconnects the motor drive while the charging connector is inserted, in the same way as your LED/charger works.

 

Most chargers are only 'trickle' chargers, designed to charge a battery over a long period of time, they do not have sufficient power to light the LED.
So the circuit includes a sensor that disable the LED when charging or as I posted earlier regarding some form of mechanical switch.

I repairing a small baby type electric car at the moment, which cannot be operated while the battery is being charged.
Inside the two pole charge connector socket is a lever which disconnects the motor drive while the charging connector is inserted, in the same way as your LED/charger works.

Though the language is different I think you will understand this video (Link to video showing and explaining LED to mains circuit deleted by moderator). Here there are no sensors.or mechanical switch as drawn in the circuit diagram. So why the White LED is not giving light?

(Moderator's note: You had been notified prior to making this post that according to the User Agreement discussion of LEDs to mains circuits is not allowed on this forum. The schematic in your prior thread on this subject was removed. Re-posting material that was removed by and Administrator or Moderator can result in temporary or permanent suspension. Now you have been warned twice, there will not be a third warning.)

 

hi Emon,
Watched the video, he explains it very well even though I do not understand the language.
It is puzzling to explain the problem you are having.?
I will think about it some more.
E

 

hi Emon,
Watched the video, he explains it very well even though I do not understand the language.
It is puzzling to explain the problem you are having.?
I will think about it some more.
E

Thank you very much sir. I will wait for your answer.

 

Its a rather interesting video I noticed the charging current is only 63Ma. lamp current draw is 86Ma low level & 145Ma on hi. The charge rate is never going to keep up with the light on.

 

hi Emon.
This is a LTSpice simulation of the circuit, using values to give a close approximation of the video voltage/current.
I cannot see an obvious reason why the LED will not light when it is on charge.??
Is the battery in good condition and charged.?
E

(Moderator's note: You know this is a prohibited topic. Your mains direct to LED circuit has been removed.)

 

hi Emon.
This is a LTSpice simulation of the circuit, using values to give a close approximation of the video voltage/current.
I cannot see an obvious reason why the LED will not light when it is on charge.??
Is the battery in good condition and charged.?
E

Yes the battery is new. It is in good condition and charged.

 

Does the torch use micrcontroller or OpAmp circuit ?

If micrcontroller then maybe they use adc to monitor the charging and battery voltages. Charging voltage will be slightly higher than battery voltage and so the microcontroller during charging mode after reading the charging voltage might be turning off the Led. When charging is turned off the battery voltage falls and microcontroller will detect it an no charging voltage and then turn ON the Led.

Alternately OpAmp in comparator mode or window comparator mode with proper reference voltage to detect charging voltage might have been used which turns off the Led when charging mode.

 

Does the torch use micrcontroller or OpAmp circuit ?

If micrcontroller then maybe they use adc to monitor the charging and battery voltages. Charging voltage will be slightly higher than battery voltage and so the microcontroller during charging mode after reading the charging voltage might be turning off the Led. When charging is turned off the battery voltage falls and microcontroller will detect it an no charging voltage and then turn ON the Led.

Alternately OpAmp in comparator mode or window comparator mode with proper reference voltage to detect charging voltage might have been used which turns off the Led when charging mode.

Hello,
Here there are no micrcontroller or OpAmp has been used. Will you kindly see the video in #10. Then you will get a proper idea about the cicuit. The video is not in english, but i think you will understand it.

 

This is the circuit from the video.

(Moderator's note: LED direct to mains circuit removed. Discussion not allowed under the User Agreement for this site.)

It is like a transformer less power supply.

R1 = 25 Ohms
R2 = 14.83 Ohms

standard values

R1 = 27 Ohms
R2 = 15 Ohms

Diodes are 1N4007.

R3 - resistor at input is 355 Ohms

Standard value you can use is 330 Ohms.