Questions tagged [loss]
The loss tag has no usage guidance.
105
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RF cable path loss - is the Signal generator > DUT > Signal Analyser method ok?
I have a cable that is used with 1290 MHz signal. I need to measure its attenuation for 1290 MHz. I have a power generator (R&S SMT06), signal analyzer (Keysight EXA), power sensor (Keysight) and ...
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Modeling a short 10mm wire for RF
This is related to another question of mine looking for parasitics which need to be added to prevent oscillations in simulations .
How should I model a short 10nH wire (say AWG 20 with 0.8 mm diameter ...
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Impact of Low Power Factor on Loss Generation in PMSMs
I am focusing on the losses generation in PMSMs and still have some doubts about the role of a low power factor.
For the analysis, I consider a three-phase PMSM controlled with Field Oriented Control (...
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Why not always connect cells in series to increase voltage in solar component setups? [closed]
I am designing a solar system which I can take to an Indio village deep into the Amazon forest, and thinking about some principles. I am talking about a 2, 3, or even 6 kW system. I see a big problem ...
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PMSM - RMS phase current as a function of Id and Iq
Assuming to have a 3-phase PMSM driven with a balanced system of currents with sinusoidal shape, is there a way to write the RMS phase current as a function of Id and Iq?
I want to use the RMS phase ...
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4
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1
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707
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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 ...
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4
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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 ...
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309
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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 ...
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2
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272
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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 ...
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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 ...
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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 ...
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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 ...
- 347
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1
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108
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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 ...
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626
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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 ...
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117
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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-...
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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 ...
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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 ...
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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.
...
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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 ...
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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 ...
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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 ...
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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, ...
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309
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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) ...
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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 ...
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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 ...
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2k
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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 ...
- 315
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163
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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 ...
- 413
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284
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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 ...
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642
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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 ...
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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 ...
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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: ...
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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 ...
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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 ...
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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 ...
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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 ...
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1
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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 ...
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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 ...
- 139
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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}=\...
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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 ...
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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 ...
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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 ...
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108
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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 ...
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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 ...
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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 ...
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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 ...
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