I have a DC fan circuit that is intended to run off of a portable USB battery pack. The fan is a 5V brushless computer fan that draws approximately 250mA. The issue I am running into is that all the portable USB power supplies I have been able to find automatically shut off if the current draw is low enough, as they assume the attached device is "charged" and no longer requires power.
Is there anything I can implement in the circuit to increase the load on the power supply without decreasing the voltage on the fan? The power supply is able to supply at least 1.0A according to the specs on the packaging.
The exact portable USB power supply in use is this model: https://www.amazon.com/MyCharge-Style-Power-Portable-Charger-Black/dp/B01LZUL0BN/ref=sr_1_12?ie=UTF8&qid=1497299186&sr=8-12&keywords=mycharge+portable+charger