I bought myself one of those mister fans from Home Depot that runs on the batteries for their drills. I thought it would be nice to be able to hook up a 12 volt battery or plug in power supply to also provide power for it, so I I soldered a boost converter with a barrel jack to the terminals where the batteries connect and set the boost converter to 18 volts. This works great, the fan doesn't know the difference. I can plug it in or I can use the battery. The issue I ran into is that when I leave an 18 volt battery plugged into the fan, when I come back it is completely drained.
Partially I'm curious why this is happening. I haven't looked at the IC driving the boost converter, but I would assume that it wouldn't be powered up unless there was power on the input side.
I was wondering if anyone had suggestions on additions I could add to the circuit to keep it from draining backwards into the boost converter (I'm assuming that's what's happening, as it did not drain the battery before I added the modification)
Here is a link to the same type of boost converter I am using.
10 Pieces DC-DC Boost Converter 2A Adjustable Module Voltage Regulator Board Input Voltage 2 Volt-24 Volt to 5 Volt-28 Volt Output Voltage (Without USB Connector) https://www.amazon.com/dp/B089Y7NDCR/ref=cm_sw_r_apan_i_Q2VKMBCHQ829G8FF7X97
Partially I'm curious why this is happening. I haven't looked at the IC driving the boost converter, but I would assume that it wouldn't be powered up unless there was power on the input side.
I was wondering if anyone had suggestions on additions I could add to the circuit to keep it from draining backwards into the boost converter (I'm assuming that's what's happening, as it did not drain the battery before I added the modification)
Here is a link to the same type of boost converter I am using.
10 Pieces DC-DC Boost Converter 2A Adjustable Module Voltage Regulator Board Input Voltage 2 Volt-24 Volt to 5 Volt-28 Volt Output Voltage (Without USB Connector) https://www.amazon.com/dp/B089Y7NDCR/ref=cm_sw_r_apan_i_Q2VKMBCHQ829G8FF7X97