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Questions tagged [efficiency]

A measure of the overall effectiveness of a system. For example, in power conversion, it would be the ratio of output power to input power.

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Darlington NPN preregulator for LDO step down 42v to 12v ~ transistors keep blowing up

this is a follow-up from the original post about this circuit which can be found here. the purpose of this circuit is to reduce the voltage to a lower level that is more palatable for the LDO. and it ...
ManeGote's user avatar
1 vote
1 answer
63 views

Analysing 42v to 3.3v DC converter circuit & component identification

I'm analysing a circuit responsible for generating 3.3v for a stm32f103c8t6 on a battery management system(10s). Its a completely proprietary battery management system with nothing online about it so ...
ManeGote's user avatar
1 vote
1 answer
71 views

Most energy efficient way to make a LED blink using a multivibrator [duplicate]

I'm using this LED. I want to make this LED blink at MAX brightness (100 mA) at 1 Hz. I need to use a multivibrator and therefore can't use any IC chips. The circuit is powered by a 3.7V battery with ...
Simon Mayr's user avatar
2 votes
1 answer
81 views

Back EMF & Efficiency of a BLDC Motor

So I've recently designed and built a 3 phase, coreless, brushless DC synchronous motor. I'm trying to estimate its efficiency but struggling to figure out the equations. Specifically, how back EMF is ...
persona679's user avatar
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1 answer
117 views

PWM LED Dimming Circuit Design Recommendations and comparison against linear dimming

I want to dim a 5 meters long LED strip reaching all across a room with a PWM signal from an Atmega328p. First the schematic and the specs: Specs: ...
CaveScientist's user avatar
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1 answer
73 views

How do half-wave RF rectifiers manage efficiencies above 50%?-A theory

First off, this exact question was directly asked here EDAboard and I think it was hinted at in atleast two other posts on this exchange programmingEnthusiast, frick, by Andy AKA, who mentioned a 100% ...
Ne612we's user avatar
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1 answer
41 views

Can I make my Battery Pack Much Efficient in my DIY Power Bank?

I was having a project of a DIY power bank as a backup for my phone. I need to use super thin batteries for this application. my goal is to make this power bank as efficient as possible. now I want to ...
Nsj09's user avatar
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19 views

MOSFETs longevity & efficiency: On-state + act of turning on VS body diode. Which state impacts lifetime/longevity more? Which is more efficient?

So if you have a back to back MOSFET pair (drain touching drain or source touching source) in series, and you want to conduct current in one direction. You have two options starting from a state where ...
Bearpaw's user avatar
1 vote
1 answer
69 views

How best to minimize shoot through with push-pull mosfet driver

I am building a custom made portable chisel sharpener from scratch. (Sick of manual sharpening! Can't find a good one!) The plan is to use an 18v battery as power source, and it will see a lot of use -...
Phenomenon Superlative 's user avatar
0 votes
2 answers
121 views

GaN @ low voltage

Is it possible to achieve a better efficiency with GaN rather than Si at low voltage (<~ 20V) I mean GaN is known for having low parasitic capacitors and so it allows to have low switching losses. ...
Jess's user avatar
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RTE schematic diagram for battery with a load

I am trying to draw a schematic to get information for battery round trip efficiency. My equipment is: 1 x 5 kW battery 1 x 48 VDC power supply 1 x 48 VDC load (const current) 1 x DC shunt 1 x ...
Randy98's user avatar
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3 answers
97 views

Does DC-DC 24V-12V waste less power than AC-DC 220V-12V?

I am modifying an existing UPS to allow for a longer backup time. I plan on adding a cooling fan along with an external current controlled power supply to charge the larger batteries. There are some ...
Hanzala19's user avatar
1 vote
2 answers
116 views

Poor efficiency of an H-bridge

I am simulating an H-bridge/class-D amplifier based on four GaN transistors with integrated gate drivers (NV6113 from Navitas). I am driving the gates via PWM signals where the PWM frequency is about ...
Charly's user avatar
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1 answer
79 views

Buck Converter : Light-Load Mode : Efficiency vs Audible Noise Reduction : Portable, Handheld Device

Question I am designing a portable (handheld, battery-operated) consumer electronic. The limited nature of the power source makes high efficiency critical at all loads, but will a lack of an OOA (out ...
kando's user avatar
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2 answers
210 views

LC Parallel resonance induction heater

Consider parallel LC resonance induction circuit with solid iron workpiece, inserted in the inductor. Is it possible to obtain more heat power output from the heated solid iron workpiece in the ...
Fan's user avatar
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0 answers
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How to measure Buck LED driver efficiency

I've build a custom LED driver based on a DC/DC Buck converter with a current feedback loop. It works pretty well, the calculated efficiency shall be somewhere around 95%, but I'm struggling with ...
Jakub Kaderka's user avatar
1 vote
1 answer
123 views

Low power, isolated, compact 230AC to 3.3DC power supply with very low heat dissipation? [closed]

Need an isolated, compact 230V AC to 3.3V DC power supply with very low heat dissipation. No heating is extremely important as – unfortunately – this regulator will be placed enough close to a ...
Zoltán Bíró's user avatar
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1 answer
72 views

Voltage Regulator Overall Efficiency

I am working on the ISL91302BIIZ-TR5931 programmable voltage regulator. It is configured as a two phase output as shown in the figure below: From the datasheet: I found that the efficiency would be ...
Roy's user avatar
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2 votes
2 answers
283 views

Does a higher switching frequency in SiC MOSFET mean higher efficiency?

https://www.we-online.com/en/news-center/blog?d=design-drivers-sic-mosfets From this link, it says "The SiC MOSFET's extremely fast switching speed helps to achieve higher efficiency". Is ...
Fredrick's user avatar
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1 vote
0 answers
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What's the impact of super high VSWR? Need help from experts

Is it realistic to make an antenna system with VSWR as high as 20 to transmit 50MHz signal? I am thinking of increasing bandwidth of a small antenna by sacrificing its mismatch efficiency. Assuming ...
perfectconan's user avatar
1 vote
1 answer
401 views

Mean Well Power supplies have much lower efficiency and much higher leakage current than rated

I am going to have a power supply which will always be connected to AC mains and occasionally, a led strip will be connected and disconnected to the supply with a relay. I want an efficient and low &...
CaveScientist's user avatar
7 votes
3 answers
801 views

What technical progress enabled high-efficiency charge pumps?

I found a lot of information on the internet, most of which told me that charge pumps are only suitable for low-power scenarios and they are not very efficient. Charging ICs based on the charge pump ...
Bruce's user avatar
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1 vote
2 answers
213 views

Does power factor fluctuation affect my UPS?

I have noticed that my UPS is showing a power factor of 0.7 during the day and 0.55 at night. I did some online research and found that this is caused by load imbalance, and a low power factor means ...
IT Researcher143's user avatar
2 votes
1 answer
89 views

Buck/boost converter behaviour when MCU is sleeping

I'm building an optical wireless mouse based on nRF52833 and a 16340 cell, I need a sanity check on some considerations regarding the DC regulation. The battery voltage goes from 4.2V when fully ...
StefanoN's user avatar
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1 vote
0 answers
94 views

Gate bias voltage in class C amplifier

Question How should the gate of the MOSFET be biased to achieve maximum efficiency (in class c amplifier), when gain is not important? Explanation On the one hand, in the tutorial (link) it is shown ...
piotr's user avatar
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1 vote
1 answer
35 views

Lithium Ion Battery : Cell Array Configuration (V.batt when converting to ≤ 4[V] )

Question I am seeking to array 6x 21700 lithium ion battery cells, leaving the option for: 1S • 6P (@ V.batt.nom = 03.7 [V], range: 02.7—04.2 [V]) 2S • 3P (@ V.batt.nom = 07.4 [V], range: 05.4—08.4 [...
kando's user avatar
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2 votes
1 answer
82 views

Efficiency formula for passive complex circuit

I want to find a formula for the efficiency of this circuit, so \$\eta=P_{out}/P_{in}\$. simulate this circuit – Schematic created using CircuitLab I know that the real power is given by \$P=VI\...
Trypol's user avatar
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0 votes
1 answer
79 views

Efficiency curve of synchronous DC-DC controller with external MOSFETs

I'm designing a 48V to 12V, 300W buck converter. I am considering using the LM5148 controller and NTMFSC004N08MC switches. I'm confused about how synchronous DC-DC controllers can list efficiency ...
w00t's user avatar
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7 votes
3 answers
1k views

When an electromagnetic relay is switched on, it shows a dip in the coil current for a millisecond but then increases again. why?

I am currently studying the effects of current on the coil of an electromagnetic relay and came across this graph: Image source: Ramirez-Laboreo, E., Sagues, C., & Llorente, S. (2015). A new ...
Syed Muhammad Ghufran's user avatar
1 vote
1 answer
115 views

How do I find the efficiency of a transformer?

I am very new to transformers. I want to find the efficiency of transformer at an existing stage. How do I find the practical efficiency of a transformer? What are the formulae and parameters we ...
Amol's user avatar
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2 votes
0 answers
89 views

LED : Perceived Light Intensity Greater Than Actual Light Intensity (via Weber-Fechner Law)

Background In this question, user @glen_geek posited (with linked references) that perceived light from an LED versus actual light from an LED is greater at lower duty cycles: @kando For PWMing LEDs, ...
kando's user avatar
  • 437
0 votes
1 answer
216 views

LED : Efficiency vs Forward Current (rather than Light Intensity vs Input Current)

LED Characteristics LED datasheets commonly provide: \$ I_{v}\ [cd] \$ Light Intensity vs \$ I_{f}\ [A] \$ Forward Current \$ V_{f}\ [V] \$ Forward Voltage vs \$ I_{f}\ [A] \$ Forward Current (...
kando's user avatar
  • 437
1 vote
1 answer
1k views

Can addressable 5 V LED strips be powered with two differently strong power supplies?

I want to power 16 m of SK6812 RGBWW LED 5 V strips with 60 pixel/m. They are rated with 18 W/m which would make the maximum power ~300 W. I highly doubt that I will ever use the full power so, 200 W ...
PowerStrugle's user avatar
0 votes
0 answers
53 views

How can my crossover be improved? Efficiency is too low

I have been working on redoing the crossover for a pair of Dayton audio B652 Speakers, and have just been working on it through a breadboard for practice. I bought a bunch of cheap parts from bojack ...
Jake Slavin's user avatar
-4 votes
3 answers
487 views

How do I know how much a kWh costs me if I have my private generator [closed]

I have a 10 kVA generator and its efficiency is approx. 90% How can I know the cost of a kWh? Estimate the price of diesel as $2.5 a liter.
P-Em's user avatar
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3 votes
2 answers
195 views

Efficiency of maximum power transfer

I’ve got this question regarding maximum power transfer. I’m trying to find the efficiency of the circuit by dividing power absorbed over power supplied. I think I found power absorbed (PL) by using ...
Mango's user avatar
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-2 votes
1 answer
67 views

How to calculate efficiency of an electrical circuit that can mimick neural network

Looking at the progress of the gpt models, i started thinking how they would be deployed to edge devices, and if that is the best way: currently using API calls. I then started looking into mimicking ...
Puneet Shrivas's user avatar
1 vote
1 answer
72 views

How to calculate input current of dual polarity output voltage dc-dc converter

I am using one of the 10W dual polarity output dc-dc converter. My output specifications are +15V, 50mA and -15V, 50mA. My supply voltage is also 15V. I want to calculate input current. Can anyone ...
Hardik Sonaiya's user avatar
0 votes
1 answer
224 views

Working out the efficiency of my class-a audio amplifier on LTspice [closed]

I can't seem to work it out using the tutorials on YouTube, any help would be appreciated.
Ash G's user avatar
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2 votes
1 answer
495 views

How to calculate stepper motor efficiency

It is often said that stepper motors are inefficient but how inefficient are they compared to a brushed-motor. I could just build something and measure it but it would be nice to know beforehand ...
Peter Balch's user avatar
0 votes
1 answer
295 views

How to calculate overall power efficiency of multi-stage BJT amp

I have a multi-stage BJT amplifier built using 2 NPNs and an initial N-channel MOSFET. The first BJT stage is a common-source amplifier with a bypass capacitor. The output stage is a emitter-follower ...
tintins7a6164's user avatar
0 votes
2 answers
184 views

Typical efficiency of logical circuit outputs

When looking at "logic" circuits (gates, level shifters, ...), usually intrinsic current consumption is specified, and is often quite low (compared to maximal recommended output currents of ...
Sandro's user avatar
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1 vote
2 answers
377 views

DC motor efficiency

I would like to build a Moment of Inertia machine: A machine that rotates an object (with a DC motor) and can also record the angular velocity and use this to find the moment of inertia. Initially I ...
Karim's user avatar
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0 votes
1 answer
118 views

Bike power supply system

My idea is to build a electronic system for my bike to supply my phone and lights with energy. I want to use a Dynamo (6 V, 3 W) to charge a USB Powerbank. From its two USB ports I want to charge my ...
TJLW's user avatar
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5 votes
1 answer
240 views

How to improve efficiency of a "dead simple" motor driver - are more MOSFETs better or not?

This is a follow-up of that question. The only reason I've got 8 transistors on that schematic is efficiency. I'm now trying to figure out whether switching losses are making it pointless to have so ...
php_nub_qq's user avatar
0 votes
3 answers
153 views

What is the best way to make my electric motorbike efficient? [closed]

I am currently doing research on making an electric dirtbike, but I am struggling with how I can make it at as efficient as possible. I think I will use a BLDC motor of 2000 W and 60V and have a RPM ...
Pacalvs's user avatar
0 votes
0 answers
427 views

Energy-delay-product vs. Joule to watt conversion formula

I am currently on my master's doing an assignment, and I am in this point in time extremely confused and I was wondering about this, quite possibly, stupid question. I am just too afraid to ask at ...
user13409892's user avatar
2 votes
1 answer
72 views

Low-power high-range current monitoring

I'm working on a power circuit for a device that is usually battery powered. Most of the time, the device is sleeping and sipping at power around ~5uA, which is great for battery life. In this state, ...
Helpful's user avatar
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3 votes
1 answer
772 views

Calculating W DC to W AC inverter efficiency

I have a DC to AC power inverter with the following information on the specs sticker: Input: 12 VDC, 50 A max AC Output: 115 VAC, 60 Hz, 400 W max (5 min) / 320 W continuous Given that current in ...
u20210512's user avatar
0 votes
1 answer
106 views

Which MOSFET for a 120W boost converter?

IRFP250N vs IRF3415 I'm making a boost converter which converts 12 V to 100 V maximum. The maximum input current is 15 A. Power of the converter is 120 W. I will drive the MOSFET with a TC4429. At ...
CaveScientist's user avatar

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