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Questions tagged [backup]

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0
votes
1answer
25 views

how to switch to backup battery when power fail?

I have a project running with MCU supplied with a 24V power supply regulated via an SMPS to 9V also, I have Li-ion battery pack 9V how to connector these two sources to run the MCU with battery pack ...
0
votes
1answer
34 views

What happens to the backup time when batteries are connected in series?

I have a backup power system consisting of a charger, a battery and an inverter. The inverter powers my load (a few mains appliances). Currently I am using a 12V 200 Ah battery which gives me a backup ...
0
votes
0answers
27 views

Backup battery convert 3.6v nicad to 3.7v li-ion non-rechargeable

Have a slot machine MPU backup battery 3.6v nicad. Would like to replace w/ 3.7v li-ion and NOT have the battery charge. Was thinking I might be able to insert a diode in line with the battery to ...
2
votes
2answers
94 views

Switch to battery when voltage supply drops certain threshold

I have made this circuit but can't quit make it work. Vext is my main supply from a car (9 - 14V) Vbat is 8 AA batteries (10 - 13V) Vout supplies power to a SMPS As it is now, supply "fades" between ...
0
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0answers
58 views

Connect backup battery pack with BMS HX-3S-01

I want to connect a LiPo 11.1V battery pack with HX-3S-01 BMS board to my circuit. I found some other boards with separate power input and and output. But this one has only one (Charge/Discharge P+-)....
-1
votes
2answers
165 views

What will happen if I powered a 24VDC device from a 27.8VDC power supply?

I have a device which has a power input from 12-24VDC Auto select and 250 mA load. I connected it with an online DC UPS which has an output of 27.8 VDC on grid mode and 24 VDC on Battery Mode. I ...
3
votes
1answer
111 views

Integrated 5V uninterruptible power supply (UPS) with a lithium cell?

I'm trying to figure out the best way to implement a UPS for an embedded system that runs from a 5V supply. Essentially the system has a 48v to 5v, 1.2A output DCDC converter that powers my system. ...
2
votes
1answer
47 views

Ebedded Linux: Recoverable, battery backed-up RAM (/tmp) [closed]

I hope this is an appropriate place for this question as it involves the use of the kernel. I have an embedded system with a battery backup for the RAM chip. The battery also allows for the MCU to ...
0
votes
2answers
77 views

What would be the safest method to power a laptop (IdeaPad 510 15isk) from a 14.8v battery pack?

Looking at my existing power jack and measuring it crudely with a cm ruler it looks like 3mm diameter x 1 cm length. The laptop bottom and charging adapter both say 20v @ 3.25 A max. What would be ...
0
votes
1answer
152 views

5 seconds power supply backup for 12V 0.5A router

My country has a problem with the mains electricity supply, which cuts off and comes back straight away. My router restarts every time that happens. What I like to know is: What would be the most ...
1
vote
1answer
321 views

Creating a Li-on backup for a 12v router

I am building a small battery backup for my router with the 12V 0.5A DC input. Main use is to keep the router powered up during load shedding (aka. power cuts / blackouts ) while my backup generator ...
0
votes
3answers
460 views

Sram battery backup

I don't have an option here in my country , No non-volatile sram and i need it for my project . i designed a circuit for that and need anyone's opinion if it's ok or need a correction .
0
votes
1answer
30 views

Only Provide Backup Power to One Device On Bus With Cap/Supercap

In a robotic system I am designing, the computer, motor controller and motor amplifier circuits all run on the same 24VDC power bus, which is provided by a switching power supply. Like below: In the ...
4
votes
1answer
1k views

Coin cell battery recharging circuit for RTC backup power

I am designing a system that contains an RTC to for displaying the date and time on a user interface, as well as log events with time stamps. In this particular case, the system gets powered-on at ...
0
votes
1answer
45 views

Seamlessly powering 12v CPU fan with regulating speeds

I am trying to have an economical and reliable control system to seamlessly power two 12v, 0.3a CPU fans with varying speeds while also charging a 12v 7ah lead acid battery for backup. I could not ...
1
vote
2answers
62 views

Powering Multiple devices off one battery backup

I have a 12v3a battery backup with 1 dc barrel connector on the end. How can I power multiple 12v devices without needing to solder them, thus opening them and voiding the warranty. One device is ...
0
votes
1answer
131 views

Battery auto backup for GSM

I have a switching power supply that operates at 4V output. I want to have my GSM always powered when my primary voltage is removed. I use a simple Li-Ion battery 4.2V and I want to use it as backup ...