Questions tagged [loss]

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PCB as heat sink - how to calculate the area

I got an Inverter of 6 MOSFETs and I need to estimate the PCB area for keeping the junction temperature below 100 °C. The losses per FET are 0.21 W which leads to a max. Rthja = 143 K/W (junction to ...
hanss's user avatar
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3 votes
4 answers
826 views

Power loss and heating in a diode

I'm quite confused about diodes heating when conducting electricity. I have "P1000 10A10" diode. It's supposedly rated for 10A forward current. When I've attached my lab power supply set it ...
Oxmaster's user avatar
  • 157
1 vote
1 answer
178 views

How to understand the "zero source impedance" in LISN insertion loss calibration

Figure 1: 50 uH LISN Diagram Figure 2: Input impedance of the LISN varies with frequency from 5Ω at 9 kHz to 50Ω at 30 MHz In Page 27 of Calibration and use of artificial mains networks and absorbed ...
Lv Yaojia's user avatar
0 votes
2 answers
165 views

Does insertion loss include return loss?

Does insertion loss include return loss? If we take a 3-ports circulator, does insertion loss from port 1 to port 2 consist of return loss of port 1, a power that leaks throug port 3 and power ...
Arseniy's user avatar
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0 votes
2 answers
112 views

Why is electricity transferred at high voltage

I know higher voltage is used because of these two formulas: P = V x I P = I^2 x R But if we substitute I = V / R in the first formula we get P = V^2 / R Shouldn’t this mean increasing the voltage ...
ACRafi's user avatar
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13 votes
4 answers
2k views

Why does this metallic magnetic core have so little core losses up until 100s of kHz?

I have a small signal transformer with values as in the below schematic (the simulate button works well to see the AC response). The values are measured and the simulated AC response agrees sort of ...
tobalt's user avatar
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0 votes
0 answers
51 views

Thermal Loss calculation of IGBT

I want to compute losses of an IGBT using datasheet information given by manufacturer. I want to calculate losses at 90 °C junction temperature while the information provided on datasheet is only for ...
Alison's user avatar
  • 337
0 votes
1 answer
92 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
0 votes
3 answers
502 views

Resistor losses in heat

I am trying to understand the power lost via heat (friction) from a resistor as opposed to what flows through and is available for the next component in series, and how I estimate this. I have read a ...
AndrewT's user avatar
  • 263
0 votes
1 answer
84 views

Power losses in Wire given end load and voltage at load

I'm trying to work out the efficiency of power transmission using a small LVDC system. I'm distributing 60VDC from a point and running it over quite a large cable (3-pair cable, 16AWG up to 500m one-...
Brandon Kellett's user avatar
0 votes
1 answer
74 views

Design calculations for LVDC grid

I'm looking to use 60 V to create a small LVDC grid to power up some small loads - 12/24/48 V maximum. For the purpose of this question I will assume 12 V only loads. 60 VDC will be the power supplied ...
Brandon Kellett's user avatar
6 votes
2 answers
513 views

Maximum DC power available over specific distances from source

I'm working on a small LVDC project using 60 VDC to distribute power over varying distances to varying loads such as network equipment. I decided to work out the maths and see exactly how much power I ...
Brandon Kellett's user avatar
1 vote
3 answers
671 views

Power loss and voltage drop for a parallel wiring system

I'm looking to power a 50W load approximately 140m away using 48V DC. At the far end I will use a DC-DC converter to convert this to 12VDC where it will power a small DC powered network switch I have. ...
Brandon Kellett's user avatar
1 vote
2 answers
882 views

Inductive power capture from AC power cable

How much power could be captured per inch by wrapping a wire around a standard 120V power cable for each amp-hour flowing through it (or whatever reference point makes sense if it's not that)? Assume ...
g491's user avatar
  • 181
3 votes
1 answer
253 views

Switching step-down voltage regulator gives lower output-current than input current

I'm currently trying to build a photovolatik cell -> DC Converter -> Battery-management-System. In the early stages of the build I was trying to use the adjustable voltage regulator alongside of ...
Crackl1ng's user avatar
9 votes
3 answers
1k views

Is charging a capacitor to a new DC voltage fundamentally lossy?

There has recently been a question about switching losses and Landauer's principle entered the discussion. I included it in my answer because I believe, a capacitor fundamentally cannot be charged ...
tobalt's user avatar
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-1 votes
4 answers
142 views

Inconsistency of electrical loss function

We have a function to calculate electrical losses for resistances and it is that $$P = I^2 \cdot R $$ If we consider this formula, our teachers generally say that if you want to decrease the losses, ...
Wtow's user avatar
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3 votes
2 answers
280 views

Understanding line losses - how can 1 supply voltage at one end of the line lead to 2 possible load voltages at the other end?

Background I have a load at the end of a fairly long cable which can accept a limited range of DC voltages. As the acceptable voltages are quite low, I'm expecting non-negligible (read considerable) ...
JRVeale's user avatar
  • 133
1 vote
0 answers
216 views

Synchronous DC-DC buck converter body diode switching loss

I have a couple of questions regarding the body diode of MOSFET. I was looking at the calculation of the switching losses in the synchronous buck converter. For calculating the turn-off switching ...
Ethan's user avatar
  • 43
3 votes
2 answers
887 views

Gate driving loss and gate driver for Buck

I have the following question regarding gate driving loss in a synchronous Buck. When we want to turn on HS or LS we have to charge their input capacitance \$C_{\text{iss}}\$. This is done through a ...
KiDMiO's user avatar
  • 61
0 votes
2 answers
1k views

Voltage Drop using DC transmission over large distances

I'm trying to figure out the voltage drop across a 2.5mm^2 (14 AWG) cable. The formula I've used is V_drop = (Length in Meters * Current * 0.017)/(area in mm^2). For a 14 AWG cable I understand the ...
Brandon Kellett's user avatar
0 votes
1 answer
143 views

Flyback diode choice

I am curious about how to determine the turn ratio to get the minimum power loss. Assuming n=Np/Ns Vin=380, Vo=40, different turn ratios can get the same output because Vo =VinD/(n(1-D)). When the n ...
EEC's user avatar
  • 413
1 vote
0 answers
254 views

Temperature rise in the inductor?

I have a customized inductor which is of E70 core. I would like to calculate the temperature rise in the inductor. Ac copper loss= 5W, DC copper loss 2.5W, core loss 8W (according to steinmetz). I ...
Manjesh Gowda's user avatar
0 votes
1 answer
456 views

Core loss of an inductor

I have been trying to calculate the core loss of my inductor E70 core but I was not able to calculate it. I calculated the operating flux density of my inductor which is 104mT and compared with the ...
Manjesh Gowda's user avatar
1 vote
3 answers
876 views

Effect of core losses on inductance in high-frequency LC circuit?

How will the core loss (hysteresis and eddy current loss) in an LC circuit at high frequencies (about 800kHz) affect the inductance of the inductor. When I measure the frequency I can see that it will ...
ht332932's user avatar
1 vote
1 answer
175 views

How to calculate reduction of inductance eddy currents in ferromagnetic core?

Suppose you have a LC circuit. Now at high frequency the core loss of the inductor meaning hysteresis and eddy current loss will increase. When this happens the frequency increases while the ...
ht332932's user avatar
2 votes
2 answers
130 views

RF Cable Loss on PCB

I'm calculating the link budget for a rocket communication that reaches 3km altitude. I'm using HopeRF RFM98W for both ends of the system. Max RF output: 20dBm Antenna Gain: 3dBi 3km FSPL at 433MHz: ...
Exclose's user avatar
  • 85
0 votes
1 answer
157 views

How can I calculate the worst-case Tj of a MOSFET in discontinuous operation at another Tamb?

I am faced with the task to calculate the maximum junction temperature of a MOSFET in a half-bridge, having conduction losses, switching losses and diode losses. The real difficulty comes from the ...
christoph's user avatar
  • 710
-1 votes
2 answers
573 views

Reverse leakage loss in diode

How can I calculate the reverse leakage loss in both diodes (2 switch half bridge rectifier ) ? I found this equation: \$P_{leak} = (1 + \delta) · I_{rr} · V_{rr}\$. There is no demonstration. Is it ...
cheniour oussama's user avatar
0 votes
1 answer
147 views

Power loss due to mismatch impedance connector in coaxial line

Not being an electronics professional but face the following problem I hope you can help me. I would like to estimate the losses due to an impedance mismatch of connector used in wall-crossing of a ...
Tristan19's user avatar
0 votes
1 answer
40 views

Is RF propagation path loss symmetrical and independent of clutter location?

Scenario: Consider two measurement points, point one is about 3m above ground level within a cluster of buildings (such as within an office park), and point two is about 1km away with an elevation ...
bud bert's user avatar
2 votes
1 answer
385 views

Core loss kW/cm³: UNFAMILIAR FACTOR

Looking at a datasheet picture, I assume this is an SI system value Pcv core loss kW/m³. I haven't found this mentioned in my studying material. What does it mean? Also, related question, how come in ...
rantoniusw's user avatar
0 votes
1 answer
390 views

Length of wire to calculate its power losses

Let us say I have 12V DC battery and I am using 10m long wire to connect my load with it. Now if I want to calculate power losses in the wire then should I use wire length as 10m or 20m (since there ...
homecloud's user avatar
  • 139
0 votes
3 answers
672 views

Which cable connection will result in a greater loss of power?

I know that running a power cable (the cable is carrying 5V DC, I plug in an AC to DC converter to the mains) that is, for example, 50m will cause losses in the power output. So if you measure at the ...
JoeyB's user avatar
  • 2,109
0 votes
1 answer
87 views

How to avoid RF signal loss in a conductive cage acting like a Faraday shield?

I have a standard chip antenna mounted on a large ground PCB plane. The product is unfortunately encapsulated inside a relatively open (carbon-fiber) conductive cage. Unfortunately, I see an obvious ...
gregoiregentil's user avatar
4 votes
0 answers
122 views

Can I calculate minimum rise time of a transmission line if I know the length and the loss tangent?

Overview: I am trying to work out if it's possible to transmit my 1.2Gbps MIPI data down a 600mm long flexible PCB strip. Assuming I have the impedance correct, will the signal still be degraded by ...
Rocketmagnet's user avatar
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0 votes
1 answer
40 views

High voltage DC point to point transfer

I have a contemplated DC electricity system that has a battery room at a distance from the use. The battery room would be about 150 feet away from where the power is used (for lighting, computer ...
Tyler Durden's user avatar
  • 2,206
0 votes
2 answers
238 views

Where am I wrong about my calculation of power loss?

The power loss of circuit is \$16kW\$ when the power factor, PF, is 0.6 lag. Now if I improve the PF from \$0.6\$ lag to \$0.8\$ lag, what is the power loss now? The solution provide me the formula ...
Shine Sun's user avatar
  • 317
4 votes
3 answers
2k views

Why will the line loss decrease when the power factor increase?

QA: If the line loss is \$50\ kW\$ when P.F. is \$0.8\$, now if P.F. become \$0.95\$, what is the value of line loss? Solution: \$\frac{P_{L2}}{P_{L1}}=\frac{(cos\theta_1)^2}{(cos\theta_2)^2}=\...
shineele's user avatar
  • 541
2 votes
2 answers
126 views

Why should we multiply Copper loss with \$ (\frac{1}{2})^2 \$, not \$(\frac{1}{2})\$ when the transformer is in half loading?

A 10 kVA transformer, its iron loss is 120 W, the copper loss is 240 W (full loading), now when the load factor is 0.9 delay, what is the efficiency when the transformer is in half loading? The ...
shineele's user avatar
  • 541
0 votes
3 answers
1k views

Initial current value in capacitor charging circuit

From this video lecture how come the initial current values are different in two cases? I think they're assuming that the switch resistance is small in the first case. However how about if they're ...
emnha's user avatar
  • 1,599
2 votes
1 answer
1k views

Low-level audio signal at 15 m distance

I'm an audio beginner. I'm required to design a box with a jack for a headset and connector for an unknown cable going to a Windows desktop PC. The headset has the standard 3.5 mm plug for the ...
Ariel Narboada's user avatar
0 votes
0 answers
105 views

Magnetic loss of steel

The software called gprMax which simulates EM waves in varying environments. I am trying to enter steel has material but from the picture, it also requires the magnetic loss(ohm/meter). But I have ...
JoeyB's user avatar
  • 2,109
2 votes
0 answers
66 views

What is the "short-range outdoor model (ITU-1411) with a distance-dependent path-loss" mentioned in this paper?

I am reading the paper Graph Embedding Based Wireless Link Scheduling with Few Training Samples, and trying to reproduce some of its results. This paper aims to solve the wireless link scheduling ...
rsch's user avatar
  • 105
0 votes
0 answers
78 views

Power dissipation BJT transistor as voltage follower

Following the discussion from this thread I am finalizing my calculations. I am not sure that I am calculating the power dissipation correctly. Given the following circuit I need to operate the opamp ...
v3xX's user avatar
  • 415
0 votes
0 answers
165 views

Unexpected values from insertion loss calculation in IEEE P802.3cg documentation

I'm looking at the insertion loss calculations from an IEEE document on P802.3cg (10SPE Ethernet). On pages 6 and 7 they talk about insertion losses over the cabling in a multi-drop scenario. I'm ...
Polynomial's user avatar
  • 10.6k
0 votes
0 answers
159 views

Coax cable loss drops by approximately 0.5 dB at a specific frequency

I am trying to understand why the measured loss of our coaxial cable is decreased exactly at a specific frequency. My understanding is that the loss should be linear with the frequency. However, there ...
pfra's user avatar
  • 33
0 votes
0 answers
72 views

Reading core loss graph of an inductor core

The question is somehow unrelated but I hope someone answers, From the above graph, how can I get the value of 0.3T line @ 25kHz ? The scales in the axes confused my mind.
muyustan's user avatar
  • 2,066
1 vote
1 answer
238 views

Insertion Loss & Return Loss - GSML2 Link

I have a GSML2 Link specification connecting Serializer and Deserializer via coax. While performing the SI analysis, I had a few doubts. In the deserializer datasheet, we have forward channel of ...
user avatar
0 votes
1 answer
168 views

Pulsed power calculation

I want to calculate power loss across a resistive load during a 1 ms interval. The experimental setup is such that the voltage and current through the load varies the whole period of 1 ms. I have 10,...
Allison_81's user avatar