EKM004 - Powerbank Keep-Alive Module
Part.no: 41022177
EKM004 is a compact and clever module for keeping power banks alive when they would otherwise shut down to save power.
Suitable for low power projects running on 5V from a power bank. The module only draws current in short pulses to avoid unnecessary power consumption.
The pulse interval is adjustable with a potentiometer from approx 4 seconds to 45 seconds. Each pulse is approx 100 ms long. Current consumption when inactive is under 1 mA and during a pulse approx 70 mA (can be increased to 100 mA with a solder bridge).
D+/D- are bridged between the USB connectors so the device does not need to be removed for programming or data transfer.
Functions
- Keeps power banks active when powering low current projects
- LED indication for activity
- Adjustable timing and current
- D+/D- connected through the module
Specifications
- Quiescent current: ~1mA
- Pulse current: 90mA (180mA selectable)
- Pulse duration (high): 100ms
- Pulse interval: 4 - 45s
- Connectors: USB A female / USB A male
- Dimensions: 44.56 x 15.24mm
Usage
As soon as the module is connected to a USB port the timer will start and draw current in pulses. Depending on the brand and model of the power bank, the pulse interval and pulse current may need to be adjusted.
By default the module is set for a pulse interval of approx ## s and can be adjusted either shorter or longer using the potentiometer on the front of the board.
The current drawn during each pulse is approx 90mA and is sufficient to keep most power banks active. The pulse current can be doubled if needed by shorting the solder bridge marked "load" on the back of the board. The solder bridge can be bridged using only solder, a short piece of wire or a component lead.
Mechanical dimensions
