Questions tagged [balancing]

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1answer
46 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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2answers
57 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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0answers
44 views

Does the location matter when performing unbalanced to balanced source conversion for this scenario?

Below circuit shows the issue when the output impedance of a DC-like source V is not balanced when coupled to a Diff Input(differential input of a data-acquisition board). As you see as an example for ...
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0answers
66 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 ...
1
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1answer
70 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 ...
1
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1answer
41 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 ...
0
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2answers
51 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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0answers
76 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. ...
0
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2answers
386 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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0answers
174 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 ...
0
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2answers
49 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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0answers
167 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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1answer
4k 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 ...
3
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2answers
2k 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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5answers
494 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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3answers
164 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 ...
1
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1answer
66 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 ...
3
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3answers
1k 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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2answers
387 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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2answers
443 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 ...
1
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2answers
3k 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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1answer
454 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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2answers
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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2answers
1k 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 ...
29
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4answers
7k 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)....
1
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1answer
387 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 ...
1
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1answer
655 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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2answers
4k 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). ...
0
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1answer
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 ...
1
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3answers
2k 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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1answer
710 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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2answers
561 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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2answers
11k 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 ...
0
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1answer
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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2answers
619 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 ...
0
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1answer
311 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 ...
1
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1answer
120 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 ...
4
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1answer
7k 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 ...
1
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1answer
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 ...
0
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1answer
2k views

What is the principle of active voltage balancing/equalizing device?

I am wondering about active voltage sharing devices. Their purpose is to equally divide voltages on slightly unequal super-capacitors. I found some papers like this, but it is too scientific. I want ...
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3answers
3k views

Improving absolute precision of ADC to balance battery voltage

I plan to use a relatively high-end microcontroller (Piccolo TMS320F28035, 12-bit resolution, +/- 4LSB offset, +/- 60 LSB gain) to measure voltage across stacked battery cells and control associated ...
2
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2answers
960 views

I'd like a basic force balance circuit that I can build on [closed]

I've been messing around with the design of a geophone. This is a sensor that is coupled to the ground (sits on the ground) and records vertical movement. I will use a phototransistor to detect ...
1
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1answer
915 views

Algorithm for balancing LI-PO batteries?

The answers to this question provide a good overview of how a single lipo cell is charged: Algorithm for charging LI-PO batteries? Most chargers that handle lipo packs have a balance mode that ...