Questions tagged [balancing]

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How many lithium-ion cells (series) per bms balance channel?

I'm most interested in the application of replacing lead-acid packs with lithium-ion packs for UPS's and/or whole house/solar power banks. I've seen it stated Tesla's automotive packs are 6s with ...
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2 answers
222 views

Balanced Audio Line Driver Off Single Supply

I am working on a device that needs a balanced audio line driver that can convert an unbalanced signal to balanced and drive a balanced cable run between devices. I am looking at schematics using ...
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3 answers
128 views

Can I safely balance a series/parallel cell circuit to power a 12V soldering iron?

I want to power a 12V soldering iron with 2x 21700 '40T'batteries and 3x 18650 '25R' batteries with a torroidal rheostat between them. The 3x25R batteries will be in parallel. The rheostat will ...
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3 votes
2 answers
426 views

Locally hatched ground plane to increase differential impedance

I am designing a flexible PCB to carry two types of differential signals. One is about 1.2Gbps 100R differential impedance, while the other is only 3Mbps, with much more tolerance on the impedance. ...
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2 votes
2 answers
193 views

Chaining TP4056 modules, the proper way

I know a similar question was asked before, but still, it didn't aswer what I'm looking for. I need to charge a series of 6 Li-ion cells, and maybe 12 in the future for a voltage hungry project. Since ...
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3 votes
4 answers
367 views

Current balance capacitor

Most series capacitors needs balancing resistors to keep the same voltage across them, but in my case, I'm using with three capacitors of 45uF in parallel that are working very close to its maximum ...
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  • 155
1 vote
1 answer
80 views

Battery Balancing Board Equilibrium Current?

I just bought some balancing boards for a Bluetooth speaker project and realized after the fact there are two different equilibrium current options. I bought both the 2S and 3S versions as I haven't ...
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0 answers
393 views

Lithium battery charger and balancer circuit (or IC)

I am working on a project which sould charge and balance 4 to 6 (maybe 8 in future) serial connected lithium cell batteries (~4000 mAh capacity) with about 4A of charge current. First I looked for IC ...
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2 votes
2 answers
364 views

Why does a Double-Balanced Mixer Reject the LO?

Look at the image of the so-called Double-Balanced Mixer (this is the active version). I understand why there is no leakage of the RF frequency in the output (because the LO square wave by which the ...
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1 vote
1 answer
994 views

Balancing of 18650 battery with parallel cells

Does a 1S4P 18650 battery need balancing? I read a lot about balancing around the internet. To me it seems like this only applies to the cells connected in series. An all parallel setup would not need ...
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2 votes
4 answers
200 views

Impedance Matching Long 2000 meter Transmission Line

My apologies if this isn't the most appropriate forum to ask this question, but I have found the response from users on this form to be extremely helpful in the past with my electrical questions. I ...
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  • 115
1 vote
1 answer
99 views

Is power balance a relevant factor in the consumption of a house?

Where I live, houses receive up to three phases from the electricity provider. There is a company advertising a power balancing service. They claim that if one of the three phase cables is overloaded,...
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  • 115
1 vote
2 answers
498 views

Does a 3-phase VFD work if one phase is reduced (e.g. with a dimmer)?

If you have a 3-phase VFD running a 3-phase motor, and you use a leading or trailing edge dimmer on one or two of the input phases, will the VFD continue to operate normally, pulling more current from ...
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0 votes
2 answers
300 views

How to convert this single ended output to a precise impedance balanced output?

This amplifier suits my purpose with one matter that I couldn’t figure out. Its output impedance is given as 0.01 Ohm. The output of this amplifier will be coupled to a very high input impedance(more ...
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  • 1,283
1 vote
0 answers
178 views

How can I balance 2 separate LiFePo4 batteries?

On my boat I've got devices that run on 24V and others that run on 12V. Seeing as how the alternator, wind generator and solar panels are all generating 24V, I guess it's fair to say that this is ...
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1 vote
1 answer
94 views

Does impedance balancing in the far end make no sense?

Below shows a conversion of unbalanced line to a balanced one: My question is about: if the unbalanced line is very long which means the signal source and the isolation amplifier is apart from each ...
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1 vote
1 answer
75 views

Can this scheme be used to balance an unbalanced output transducer?

If we want to create fully differential and balanced outputs, and if we don’t have a single ended to differential ended converter/driver, can we use the following scheme neglecting the voltage divider ...
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0 votes
2 answers
247 views

Are the headset microphone signals travel unbalanced way and how do they reject noise?

Below shows a dynamic microphone equivalent circuit: As you see above, the microphone output is first converted to balanced circuit via the transformer. The signal then travels along the cable until ...
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0 answers
198 views

Ceramic capacitors in series to increase AC voltage rating

If I put 4 of 1uFx100V cercaps in series I will virtually have one .25uFx400V capacitor. As I know I should use balancing resistors for even distributinon of the voltage across the capacitors. ...
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0 votes
2 answers
2k views

Li-ion battery cell balancing statistically unnecessary when many cells are in parallel?

Lithium ion batteries packs need to be balanced because of a small random voltage difference for each section in series, that may cause the voltage levels in a pack to diverge over time, right? So if ...
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0 answers
425 views

How do I make a simple bidirectional current limiter

I want to connect two separate batteries together and let the highest voltage one charge the lower one not exceeding the desired current. I expect it to be a solid state solution without the need for ...
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2 answers
61 views

How are load currents balanced in a distribution system?

Below I drew a simplistic view of a distribution transformer which supplies a particular public area for example some households and shops ect.: Va, Vb and Vc are three phases(line voltages) of the ...
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  • 1,514
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0 answers
194 views

How can 8.4V stacked super-capacitors (EDLC) not require balancing?

I've recently seen 8.4V stacked super-capacitors which advertise themselves as "not requiring any balancing". Namely, the 196HVC series from Vishay. How can this be true? Even if the cells are ...
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  • 1,258
-5 votes
1 answer
6k views

Large 10 kWh 18650 Lithium-ion power pack - What configuration? [closed]

I need to build a 10 kWh lithium-ion pack, anywhere from 70 V to 200 V. This is to drive a motor. Power output will not exceed 15 kW. The cells will be Panasonic NCR 'B' at 3.4 Ah 18650. I would ...
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4 votes
2 answers
5k views

Balancing NiMh batteries in series over a long term

I'd like to place two NiMh batteries in series to drive a string of single LEDs. I can charge them simply at C/20 or so and the output will be intermittant so the batteries will never reach half ...
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0 votes
5 answers
852 views

Regulating LED brightness using headphone output

My PCs headphone jack (green) outputs a 4Vpp (2V amplitude) sinusoidal signal at 100% output level set in the sound preferences. What kind of circuit would I need to drive a red LED (2.2V forward ...
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  • 13
0 votes
3 answers
167 views

Can this gaming problem be represented as an electric circuit? [closed]

I'm creating a game where every user has a network of connected nodes that each have a specific amount of energy. The nodes will try to distribute energy evenly amongst themselves. If a node has more ...
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1 vote
1 answer
111 views

LTC4370 load sharing

Datasheet LTC4370 Background: I want to use this chip to combine the power output of two 2.4A USB ports on a USB power bank I have. If this is possible it will output ~25W and w/ my dc-dc converter ...
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  • 85
3 votes
3 answers
2k views

How to limit voltage charge of supercapacitor

For a DIY project, I plan to charge an 100F 2.7V Supercapacitor using a 3.7V Lithium-ion 18650 battery. However, I need it to charge only until 2.25V. Is there a simple circuit that I can build to ...
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0 votes
2 answers
487 views

Balancing Mains Electrical Loads

Is there a benefit to the utility company, or potentially to me, for balancing the loads across the two 120V legs in my mains power? this About page suggests some benefit, though the explanation seems ...
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  • 636
1 vote
2 answers
958 views

How (do i need to?) do i balance cells during discharge?

i have a 4s4p 18650 lithium ion pack and i balance during charge (from 4 to 4.2V) down to ~5mv difference on discharge i still see >100 mV difference at the end (2.5V). is it worth it to add a ...
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2 votes
3 answers
8k views

Balancing Resistor Values for Series Capacitors

I just wanted to confirm my rough calculations are correct in selecting balancing resistors for 2 capacitors in series. Here are the specs: 2x 10,000uF Capacitors with 500V rating in series. I ...
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1 vote
1 answer
490 views

Quadcopter balance with MPU-6050

It is not uncommon to see people asking about how to balance a quadricopter using MPU-6050. It's also common to see people answering that a PID controller is needed. However, people doesn't say how. ...
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1 vote
2 answers
2k views

Equalizing motors speed for balancing robot

I am currently working on a balancing robot project using Arduino Uno. I am able to get the robot to balance but one of its motor have the tendency to rotate more than the other. I am using the ...
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  • 11
1 vote
2 answers
2k views

Driving mosfet in battery balancing circuit by an mcu

I'm trying to make a simple passive battery balancing circuit using logic level n-mosfet driven by MCU. However, I've got some issue on how to drive the mosfets by the digital output of the mcu, and ...
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  • 11
29 votes
4 answers
9k views

Why are the three component LEDs in an RGB LED so unbalanced?

I was recently spec-ing some RGB LEDs for a project, when I noticed that the millicandela ratings on the three colors are rarely close to the same number. (i.e. 710mcd Red, 1250mcd Green, 240mcd Blue)....
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  • 559
1 vote
1 answer
759 views

Balanced BNC cables?

I'm working in an experiment with high voltages and unfortunately a high voltage AC source is affecting the signal in my BNC coaxial cable (which is going into an oscilloscope or some other measuring ...
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  • 111
1 vote
1 answer
838 views

Using balancing charger with Li-Ion protected cells

I'm making a 2S1P battery pack with 18650 elements, each of which is protected. Cells currently can be charged individually as each has a TP4056 board attached to it, that means charging one cell then ...
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2 votes
2 answers
6k views

Lithium Ion Cell balancing

I’m making a Lithium Ion charger circuit and successfully used a Texas Instruments bq2057c to charge 2 Lithium Ion cells in parallel (4.2V). Now I want to do the same with the cells in series (8.4V). ...
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  • 121
0 votes
1 answer
1k views

Balancing quadcopter using mpu6050 [closed]

I am on a project which nearly completed. But what remains is balancing. My project is making a quadcopter. All the programing and hardware stuff is completed. But when i fly it, it doesnt goes up, it ...
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1 vote
3 answers
3k views

Op-Amp based guitar direct box

I successfully built an active DI box using this circuit (image posted below), everything went fine and I'm happy of the result. Parts List ...
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-1 votes
1 answer
863 views

How to design a single-ended to differential converter with audio transformer?

I am attempting to build an audio amplifier that accepts an arbitrary stereo input signal via a 3.5mm connector. My objective is to convert that single-ended input into a balanced AND differential ...
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0 votes
2 answers
671 views

avoid Li-Ion batteries explosion

As a student group project, we are going to use Li-Ion batteries to test our charging and balancing circuit. These batteries at risk of explosion. How should we avoid that danger? Is there any ...
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  • 143
0 votes
2 answers
13k views

Li-ion 3S balancing charging using a TP4056 with protection OR use other charger and a protection device

Trying to make a little powerpack for my boat with old 18650 cells. I am planning on a 1 kWh pack, so charging each cell individually is not an option... I have planned to set up 10 packs of 4 ...
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  • 21
0 votes
1 answer
1k views

battery balancing

I am using a balancing circuit for a 3S (3 series 11.1V) li pol battery. The chip I am using is the S8204B. I am unable to understand the datasheet properly. I have basically 3 components in my system ...
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  • 1,879
1 vote
2 answers
692 views

High Cell Count LiPo Balancer/Charger

How would I go about balance charging either 100 or 75 lipo cells? This is a very serious question by the way, it's for an electric vehicle and we use either 75 or 100 cells at a go and currently ...
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0 votes
1 answer
321 views

Use Arduino to Plot the balance of my airplane propeller using optical sensor and reflective tape

I would like to use an arduino to determine how out of balance my airplane propeller is. I've seen a production device that uses an optical sensor and reflective tape to plot this. Can this be done ...
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1 vote
1 answer
127 views

How can I charge just one Lithium Polymer cell?

I have a small 3.7V 100mAh Lithium polymer battery. This is just like any other Li-Pol battery, but it is smaller. Like any rechargeable battery, I want to recharge it. From what I found online, I ...
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  • 209
4 votes
2 answers
9k views

Connect Wii balance board pressure sensor to an Arduino

We have a Wii balance board pressure sensor and were wondering how we could connect this sensor to an Arduino board. On the circuit board (see picture) of the Wii Balance Board are Japanese ...
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2 votes
1 answer
2k views

balance charging current for batteries connected in series

I've been using this simple Li-Ion charger for quite a while. It consists of 4x 18650 Panasonic NCR Li-Ion "unprotected" batteries (3.1Ah), connected in series (2+2). Charging was going well with cell ...
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