Project with Adafruit Lipo charger, Lipo battery, Led &Capac

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

Here more pictures... And also the PN2222 becomes really hot within a few seconds.
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adafruit_support_bill
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by adafruit_support_bill »

There will be a small voltage drop through the transistor. It is also possible that your bulb requires more current than the PN2222 transistor can supply. This MOSFET can handle a much higher current and would have less of a voltage drop than the PN2222: https://www.adafruit.com/product/355

You can connect it as shown below:
lamp.png
lamp.png (120.71 KiB) Viewed 147 times

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

Hello,
I've just tried but there is too much power and light bulbs don't like it... (heat, cut)

Probably, a lower voltage was working because I used dimmable bulbs.
But it seems I need 12V but I don't find touch switch or micro-charger in 12V. Do you think it could be a good solution to use a DC DC step up converter like here before the light socket :https://www.youtube.com/watch?v=Q5bi9-o ... l=POWERGEN

I don't know if the battery will do a good job in this case and how do I need to connect the 'OUT' of the Capacitive touch.
Capture d’écran 2022-09-01 à 12.59.51.png
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Thanks for any help, patience too.
Ophélie

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adafruit_support_bill
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by adafruit_support_bill »

I've just tried but there is too much power and light bulbs don't like it... (heat, cut)
...
But it seems I need 12V
If it is overheating with 3.7v, 12v will probably kill it instantly. Do you have a manufacturer's part number for the bulb? It would help to know the specifications.

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

Thanks for your reply...
I don't understand, the PN2222 get a weak light and now the mosfet give a normal light but for few seconds or with an anormal heat of the bulb.
The mosfet can increase the power, no am I right?
Capture d’écran 2022-09-01 à 14.16.53.png
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Capture d’écran 2022-09-01 à 14.21.09.png
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For bulbs, I am testing with these Philips :
Capture d’écran 2022-09-01 à 14.23.42.png
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These G4 dimmable standard bulbs are working on the industrial lamp I have with an 3,7V battery too.

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adafruit_support_bill
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by adafruit_support_bill »

The MOSFET does not increase anything. It is just more efficient at switching than the PN2222, so there is less voltage drop from the battery. If your bulbs work fine connected directly to the battery, they should work fine with the MOSFET.

You have at least two different bulbs there. The one on the far right is rated for 12v AC and 1W. The one in the center is rated for 12v AC and 1.8W. The LEDs are DC devices. So there is probably some circuitry internal to the bulbs that converts the 12V AC current to DC for the LEDs.
These G4 standard bulbs are working on the industrial lamp I have with 3,7V too.
Is there any other circuitry in that lamp? Measure the voltage that it produces at the lamp socket.

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

I don't think I made a mistake regarding your drawing, but maybe :
Capture d’écran 2022-09-01 à 14.40.19.png
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adafruit_support_bill
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by adafruit_support_bill »

That all looks correct. The maximum output voltage of that circuit will never exceed the output voltage of the battery. So if your bulbs work fine powered directly from the battery, I see no reason why they would overload using that circuit.

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

Hello,
I have 3.49 V at the socket (existing lamp) et 4V for mine. But the bulb G4 "3,6V" (existing lamp) is better than mine in 12V. But 3,6V G4 bulb doesn't exist on the LED G4 market. Even on the existing lamp I have strange power cuts with 12V philips bulb.
Do you think it could be the circuit into the dimmable bulbs that are the actual problem?

Thank you, Kind regards,
Ophélie

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adafruit_support_bill
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by adafruit_support_bill »

It is not realistic to expect a 12v bulb to perform well in a circuit designed for a 3.6v bulb. It is somewhat surprising that it lights up at all. But then, we really don't know anything about the internal circuitry of the bulb.

If all you can get are 12v LED bulbs, then you may be better off with a 12v circuit. You could use a 12v step-up converter like this: https://www.pololu.com/product/4016

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

Ok thanks,
If I put a 12V booster, will my 3,6V battery be discharged three times faster? (12/3,6 = 3,333).

On this pololu booster, I connect :
GND of the switch and charger - to GND pololu
OUT of the switch - to OUT pololu booster
BAT of charger - to VIN pololu
VDD of switch - to VIN pololu ?

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adafruit_support_bill
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by adafruit_support_bill »

If I put a 12V booster, will my 3,6V battery be discharged three times faster? (12/3,6 = 3,333).
The conversion process is not 100% efficient. Some additional energy will be dissipated as heat.

All else being equal, the battery discharge rate is likely closer to 4x faster. However, the current draw of a 1W 12v bulb is probably about 1/3 that of a 1W 3.6v bulb. So your battery life will likely be shorter, but not 4x shorter.

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

Hello,
I would like to try to use one 6V led bulb and one 6V step-up (battery 3,7V). But, I think I made a mistake with my connections, could you say if I'm wrong? Maybe the mosfet is not allow here?
Capture d’écran 2022-09-10 à 15.25.28.png
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Thank you for your help,
Have a nice day,
Ophélie

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ophelie
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by ophelie »

Forgot to say; that's the switch I don't succeed to connect... with and without mosfet.

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adafruit_support_bill
 
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Re: Project with Adafruit Lipo charger, Lipo battery, Led &Capac

Post by adafruit_support_bill »

I would check with Pololu about the connection details of the step-up converter you are using. You probably should connect it directly to the output of the charger board and control it via the EN pin. Pololu should be able to help you with that.

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