Uninterruptible power supply using 5V power bank

SawMaster

Well-Known Member
Joined
Apr 10, 2015
Messages
5,783
Reaction score
5,209
Location
SC
Country
United States
Dash Cam
G1W-S, G1W-HC, G1W clone, B1W, N2 Pro, K2S, B2W, (ex Mobius)
Just as the circuit is drawn. One output wire splits into two, one for each cam. You can use the jump-pack's ciggie outlet and a "Y" splitter or hub to do this. These are simple splitters; there's no need for boost circuits here.

No problem for the car feeding the whole thing while the car is running as it's only a few amps total being drawn. All car alternators have far more reserve power than this.

Phil
 

tonecas

Member
Joined
Jul 3, 2018
Messages
36
Reaction score
11
Country
Portugal
can anyone explain how does the system from OP works by having the relays always charged? i mean, the positive bus can be powered by the main power or the power bank, so the coil in the relays/optocoupler will be always charged and the circuit path should always be on... i guess the trick is done with the short between the NO1 and NC2, but can't seem to understand how :(.

i am building my solution based on a DPDT automotive 12V relay but would like to understand how this magic happens so to maybe improve the circuit and spare some redundant connections
 

Error7

Well-Known Member
Joined
Apr 15, 2014
Messages
1,308
Reaction score
569
Location
Kearsley, Bolton, Manchester
Country
United Kingdom
Dash Cam
Mobius - 808 #16 4 x G1W-H - 2 x 70mai
My solution which suits my application is to use a 2 hour timer and a single pole relay configured as per my diagram. Ignition circuit powers the camera while engine is running but when ignition is switched off, the 2 hour timer initialises to continue powering the camera from the cars battery.
This may not be suitable for a lot of people but it's adequate for short term parking at the shops.

Relays.JPG
 

viperman_69

Member
Joined
Sep 5, 2019
Messages
64
Reaction score
19
Location
Seattle, WA
Country
United States
IMG_1884.JPG
This is what I put together.... you can use all your own power banks and cables as this device only handles the switching of the power from when the car is on to the power bank when the car is turned off. If I want parking mode to work then I just hook up the appropriate D signal wire. I am going to get a small project box to stuff this in. Dimensions are about 1x1 inch
 

tonecas

Member
Joined
Jul 3, 2018
Messages
36
Reaction score
11
Country
Portugal
View attachment 48774
This is what I put together.... you can use all your own power banks and cables as this device only handles the switching of the power from when the car is on to the power bank when the car is turned off. If I want parking mode to work then I just hook up the appropriate D signal wire. I am going to get a small project box to stuff this in. Dimensions are about 1x1 inch
Can you describe the hardware used?
 

Nath

Active Member
Joined
Aug 8, 2017
Messages
265
Reaction score
109
Country
Germany
Dash Cam
Viofo A129-Pro Duo
Guys, it's just TPS2113A breakout board with two USB connectors on PCB, no magic here... Just smaller clickless "switch" as the OP's (and without interrupt).

 

viperman_69

Member
Joined
Sep 5, 2019
Messages
64
Reaction score
19
Location
Seattle, WA
Country
United States
I have been using my setup for about a week now with no issues... seems to work perfectly
 
Top