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I have a device in which I have used 3.7v of the lithium-ion battery for power supply and for charging this battery, I am using a tp4056 module.

when I connect a battery to tp4056, battery fully charges and tp4056 disconnect power to battery and device start run from a battery. when the battery drains approx 30mV, its again start charging until going on full.

My device runs from 3.7v to 4.2v.

Now I want to make it more reliable for my device. When a battery has fully charged, its disconnected by tp4056 module and stop giving current to the battery and device start to run from the battery and when the battery drains approx 30mV to 50mV, charger module wakes up again and start charing and it will be affected on the life cycle of the battery.

I want when my device is connected to the adapter and if the battery is going full charge then my device should be run from the direct power supply, hence battery charge won't drain until disconnect of power.

please help me and sorry for I am not being to explain my problem as professionally.

thanks in advance.

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I want when my device is connected to the adapter and if the battery is going full charge then my device should be run from the direct power supply, hence battery charge won't drain until disconnect of power.

If I read you correctly then maybe use a relay to divert supply from the battery to the adapter output: -

enter image description here

Whenever the adapter is producing power, the relay activates and the load is connected to the adaptor output. If the AC supply fails, then the load is connected to the battery.

If this is what you want then a few other details need to be considered: -

  • Adapter output voltage range
  • Load voltage range (might have to add a regulator)
  • Reverse diode across the relay coil
  • A hold-up capacitor across the load for when the relay switches (10 ms glitch protection).
  • Possibly use a MOSFET power OR-gate instead of relay
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  • \$\begingroup\$ I want to replace the relay with MOSFET or any other transistor. How can replace? \$\endgroup\$ – Aarav Soni Jul 5 '18 at 6:52
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    \$\begingroup\$ Maybe something like this? It is an ideal diode power OR gate - whichever supply is highest gets to supply the load. Or maybe look for hot-swap-controllers? \$\endgroup\$ – Andy aka Jul 5 '18 at 9:36

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