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Hot!Power Bank that supplies 5V to a circuit

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2019/04/24 09:09:41 (permalink)

Power Bank that supplies 5V to a circuit

I have a voltage regulator to 3.3V that feeds a circuit with a PIC and a LoRa Module, the circuit transmits for 10 seconds and remains sleep for 5min, has a total current consumption of 16mAh. If the circuit is powered from the USB port of the PC it works continuously, but if I connect it to a Power Bank it only works the first 5 minutes. What can I do so that the Power Bank does not shut down?

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    Re: Power Bank that supplies 5V to a circuit 2019/04/25 10:15:54 (permalink)
    +1 (1)
    Draw more current.  Or switch to a different power bank that is more sensitive.
    You could either:
    a) Connect a resistor from 5V to 0V to increase the current permanently.
    b) If you want to be less wasteful, connect a resistor from +5V of the USB and through a transistor.  Then you can turn the transistor ON for a few seconds at least ever 5 minutes to keep the power bank alive.
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    Re: Power Bank that supplies 5V to a circuit 2019/04/26 03:02:03 (permalink)
    +1 (1)
    Or just find a battery block with hardware on/off switch.
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    Re: Power Bank that supplies 5V to a circuit 2019/04/26 14:03:44 (permalink)
    What is a "power bank"? I assume it is a USB charger like the following:
    The advice given above seems to be good. You might also be able to run the device on its own rechargeable battery or supercapacitor for the five minute sleep, and the current change upon wake-up should reactivate the power bank the same way as removing and plugging in a USB device.

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