All Questions
43
questions
11
votes
4
answers
3k
views
Boost or buck regulator for battery life?
I want to make a wireless sensor node that will run at about 2.5v. I am trying to decide between running 3 alkaline batteries in series with a buck converter or in parallel with a boost converter. I ...
- 1,202
3
votes
5
answers
8k
views
How to power a GSM Modem from a Li-Po battery?
I want to integrate an AirPrime SL6087 GSM modem into a design, this is my first try at working with a GSM module. The datasheet states that the modem draws 2A for 1mS every 4mS (max) at 3.6V, the ...
- 2,525
3
votes
2
answers
2k
views
How to convert 48V to 5V in this system?
I have built a prototype for monitoring the battery voltage of my off-grid PV system. The prototype is as shown in the clumsy schematic drawing below, and it uses 24 V battery. I use an OKI-78SR-5 to ...
- 65
2
votes
1
answer
610
views
Why is LM2596 buck converter output current low when used as a mobile charger? [closed]
I have a LM2596 buck converter which is capable of providing 3 A and my input source, which is a transformer, is capable of providing 5 A.
When I use the buck converter to charge my Android phone ...
- 131
2
votes
2
answers
701
views
How much charging ripple voltage is allowed while charging a LiFePO4 battery?
We are designing a buck controller to charge a LiFePO4 battery (4 series 9 parallel cells, each of 3.2 V).
Hence, we would like to charge the battery pack with 13.90 V but the buck output has got a ...
- 29
2
votes
4
answers
10k
views
Battery Charger using a buck converter
I'm designing a Lead Acid battery charger with 3 stages. For the 2nd stage (constant voltage stage) as it is written in literature: the voltage applied on the battery must be dependent on temperature. ...
- 63
2
votes
1
answer
599
views
Extending battery life: Calculating advantage of adding more batteries
I have a small 3 volt device with an MCU and 8 LEDs that I'm currently powering by two AAA batteries connected in series. With fresh batteries, I start out with about 3.2-3.3 volts and get very good ...
- 1,835
2
votes
4
answers
27k
views
Charging 2 Li-Ion Batteries via a single charger
I'm currently building a portable USB charger. It uses 2 Li-ion batteries in series connected to a USB port via a 5V regulated buck converter. While a single Li-ion battery would suffice for most ...
- 567
2
votes
2
answers
2k
views
Building a low-power solar/wind buck-boost converter
Using a 18V(max) solar panel, I'd like to charge a 12V lead-acid battery. I'm working from the basic inverting buck-boost circuit. My main question is, being a relatively low-power circuit, can I ...
- 127
2
votes
2
answers
6k
views
Powering 24 V and 12 V device simultaneously from two 12 V batteries
I have two devices which need to be battery-powered (remote area, no grid power available). One device requires 24 V, the other requires 12 V. Both are very low amperage (~50 mA).
Can I use my two 12 ...
- 121
2
votes
2
answers
530
views
Powering DSLR with buck/boost convertor
I've been experimenting a bit with time-lapse photography lately. Still basic stuff. Right now I have to change batteries every so often which is a pain because it's hard not to move the camera when ...
- 123
2
votes
0
answers
371
views
Any specific precautions should be taken when using 2x AA LiSOCL2 batteries in parallel?
I am working on the wireless sensor design and one of the sensor is such that it needs to be kept ON through out the operation and it takes supply of 3V and current of about 100uA, which I think is ok ...
- 358
2
votes
3
answers
3k
views
Why is my buck converter emitting smoke and fire?
I am powering my router from a 24 V battery, but the power requirement of router is 12 V/1 A, so I am using an LM2596 buck converter.
The specification for this buck converter is as follows:
Input ...
- 123
1
vote
2
answers
8k
views
How to adjust output current on a buck converter?
I 'm planing to use a zinc–carbon 9 V battery to power up:
the circuit that battery belongs to
BeagleBoard-xM
I 'm thinking of using a breadboard, in order to power up both circuits. Beagleboard-xM'...
- 659
1
vote
2
answers
738
views
12 V, 18 Ah battery for a solar panel
I have a 100 W solar panel. I bought a 12 V, 18 Ah battery with a 30 A PWM solar controller. How can I get this to charge right? The current will be too much for the battery. How can I cut down the ...
