1. E

    How to power a pc usb powered only device using a usb charger only.

    I have a Focusrite Scarlett Solo interface. I can power it up normally from a laptop usb output. But i want to use it without a laptop or pc so I only need to power it up using an ordinary usb charger. It won't work with a usb charger only. It seems it won't power up without the communication...
  2. E

    Charge two 18650 using single tp4056

    I have two 18650 batteries to charge using TP4056. I have seen in at many posts like people are using individual tp4056 charging module for each 18650 battery and also observed like some are using single module to charge two 18650 battery. Is it fine to use single tp4056 charger circuit to...
  3. NVZN1

    Is this circuit safe for 18650 charging?

    So i got this flashlight-it has built in lithium 18650. But i looked the PCB, i think it's way too simple. I only see resistors, and only has 1 super small IC. Does this even work for guarding and protecting lithium 18650 like BMS? I compared it with TP4056, tp has lots of IC (DW IC protect...
  4. Tapish

    Charging individual 3.7V Li-Ion batteries that are connected in series to from 7.4v supply

    Hope you all are staying safe and healthy. The Pandemic lockdown has forced us to work with the only components we have at home. I am working on a battery-operated esp32 pico board having other sensors hooked up to it that need 5v of supply. So I connected two rechargeable 3.7v Li-Ion batteries...
  5. J

    Current control for a battery charge

    How can I control the current that is supplied to a battery? I need to balance current consumption to avoid some parts of the system run out of power. My system is described in the attached file. I have a 12V input which goes into a Boost regulator to get 48V. Those 48V are used to feed a...
  6. johnyradio

    Do LI Charger Chips Require Constant Current Input?

    LI charger chips are switching step-down converters with a constant-current mode. Say it's a single switch buck-type charger. It's input range is 5V to 10V, and is capable of charging cells at 2A. Will that chip require a 2A input regardless of Vin, whether 5V or 10V? Or, can the chip accept a...
  7. P

    How to implement my control system on my dsPIC33EV 5V CAN -LIN Starter kit (dsPIC33EV256GM106)

    Hello everyone, So I have been working on a wireless charger for EV applications. The prototype I designed uses a control system to manage the voltage at the exit of the charger. Without going too deep, we can just assume the charger is a source supplying a square signal of 15 Volts of 150kHz...
  8. G

    Li-ion cell charging module resistor selection?

    Greetings. A vendor selling TP4056-based 5 V charging modules for Li-ion cells specified the following resistance values and resulting current for selecting the current-programming resistor: R (kΩ) I (mA) 30 50 20 70 10 130 5 250 4...
  9. P

    Inductive Power charge simulation current control

    Hello everyone, I am writing to ask about how can I control de currents in my inductive charger more specifically the current in the resonant tank I designed. My goal is to design an inductive wireless charger that uses a resonant tank to maximize the efficiency of the process. I am going to...
  10. P

    Li-ion battery charging termination current

    Hi all, I have a question about Li-ion rechargable batteries. I have almost no experience with it. Documentation to battery is very poor, but there is an info about charging profile: Stage 1: Constant Current 0.82 Ampere (0.2C) until Voltage reach 4.2V Stage 2: Constant Voltage (4.2V) with...
  11. Theo_KVA

    Solar charging multiple 18650 Li-on cells with TP4056?

    Hi everyone, I plan to build a high capacity 3.7V/5V solar charging powerbank (something like 10-15ah). I’m going to use modules of TP4056 breakout board each coupled with two 18650 cells in parrallel. But I was wondering what would it need to charge two or three of these TP4056 modules with a...
  12. T

    Making a mobile phone fast charger plug

    Hi all, I am totally new to all this and i honestly have no idea what i need so im looking for some advice. what i want is to be able to make my own circuit board layout for a fast charger plug for your mobile. what i want to know is: what components do i need which components connect to...
  13. Arunmosespaul P

    Need charger solution - Board

    Hi There, I am need of a circuit that will work as expected. Please check the attached image for information.
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