Questions tagged [loss]
The loss tag has no usage guidance.
87
questions
0
votes
2
answers
80
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 ...
- 121
3
votes
1
answer
89
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 ...
- 33
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 ...
- 10.2k
-1
votes
4
answers
108
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, ...
- 3
3
votes
2
answers
182
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) ...
- 133
0
votes
0
answers
86
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 ...
- 33
3
votes
2
answers
217
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 ...
- 61
0
votes
2
answers
160
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 ...
0
votes
1
answer
91
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 ...
- 349
1
vote
0
answers
121
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 ...
0
votes
1
answer
112
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 ...
1
vote
3
answers
314
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 ...
- 37
1
vote
1
answer
70
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 ...
- 37
2
votes
2
answers
78
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: ...
- 53
0
votes
1
answer
92
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 ...
- 660
-1
votes
2
answers
171
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 ...
0
votes
1
answer
69
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 ...
- 49
0
votes
1
answer
26
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 ...
- 1
2
votes
1
answer
212
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 ...
- 21
0
votes
1
answer
184
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 ...
- 139
0
votes
3
answers
236
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 ...
- 1,261
0
votes
1
answer
50
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 ...
- 641
3
votes
0
answers
76
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 ...
- 26.1k
0
votes
1
answer
29
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 ...
- 2,128
0
votes
2
answers
117
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 ...
- 307
4
votes
3
answers
1k
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}=\...
- 551
2
votes
2
answers
72
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 ...
- 551
0
votes
3
answers
727
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 ...
- 1,521
0
votes
0
answers
84
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 ...
- 1,261
2
votes
0
answers
51
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 ...
- 105
0
votes
0
answers
65
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 ...
- 385
0
votes
0
answers
90
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 ...
- 6,637
0
votes
0
answers
73
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 ...
- 33
0
votes
0
answers
37
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.
- 1,966
1
vote
1
answer
94
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 ...
- 2,186
0
votes
1
answer
114
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,...
- 73
3
votes
7
answers
4k
views
Why do we use low resistance cables to minimize power losses?
Generally, one would like to minimize power losses via Joule heat. Intuitively, using low resistance cables (for example by using materials with low resistivity like copper) should do a better job ...
1
vote
2
answers
1k
views
What causes power losses in transmission lines?
From my understanding there are two causes for power losses in transmission lines:
Losses due to resistance:
\$ R = \frac{\rho l}{A} \$, where \$\rho\$ is the resistivity, \$A=\pi r^2\$ and \$ l \$ ...
- 193
0
votes
2
answers
679
views
what does Loss Tangent means in capacitor?
As we know the definition of Loss Tangent in capacitor which it is:
When a sinusoidal alternating voltage is applied to an ideal capacitor, the current advances by pi/2 in phase. In the case of a ...
- 53
0
votes
1
answer
127
views
HC05 Bluetooth Ping without losing connection
I am currently working with the Bluetooth module HC05 using a Teensy 3.2 board. I successfully established a connection between the laptop and the board using Bluetooth. I can send data from the board ...
- 3
2
votes
2
answers
127
views
Can't achieve the goals in designing and simulating Resonator circuit
Goals
I need to design resonant parallel circuit and simulate it with LTSpice so that it match with the design requirements correctly.
Requirements
Source Impedance \$R_s = 100\ \Omega\$
Load ...
- 774
1
vote
1
answer
55
views
Dielectric Loss for Constant Impedance
Are dielectric losses the same for two different 50ohm structures that are built in the same dielectric medium?
Eg. Two 50ohm Stripline traces in FR4 where one is very skinny with close GND planes, ...
- 4,489
2
votes
1
answer
580
views
Calculation of transmission loss of a power plant
What is the transmission loss due to heat if my power station produces electricity at a power of \$5 kW\$ and the electricity consumer is \$1 km\$ away?
It is a copper line with a material constant ...
- 123
0
votes
1
answer
109
views
Ohmic power loss due to electric field
Recently I read in the basic EM theory course , that the Ohmic power dissipated in a conductor is directly proportional to the conductivity and the square of the electric field intensity , but we know ...
2
votes
2
answers
88
views
Can digital clocks and other electronic devices "ride through" a momentary power interruption?
I recently attended an electric utility training course discussing relay protection practices. One topic that came up was a fuse saving scheme where a protective reclosing device would momentarily ...
- 21
0
votes
0
answers
51
views
Non-uniform temperatue distribution
Please assume a semiconductor chip like IGBT or MOSFET heated by a specific power loss. It is found that the more the power loss is, the more severe the chip's temperature distribution non-uniformity ...
- 29
0
votes
2
answers
165
views
Loss due to impedance matching in a filter
I have a quite basic question, after starting to re-read some RF theory. If a voltage source has a resistance of 50 ohms, and the equivalent impedance of a connected bandpass filter and its load are ...
- 2,985
3
votes
2
answers
27k
views
Determining how much current I can actually run through my Cat6 24AWG Cables in my confirguration?
I want to use a CAT6 (24AWG) RJ45 cable to carry a total of 2A at 48V. As per the AWG Chart, I see that the Maximum amps for power transmission is 0.577A but the <...
- 287
0
votes
2
answers
472
views
Ground losses in mains delivery network
It is my understanding that the mains distribution system (poles along the road, where I live) has occasional earth ground connections of the Neutral wire. Maybe every pole, or just every few poles, ...
user56384
0
votes
3
answers
122
views
Link budget - Path-Loss in a Wlan Network
I am struggeling with the dB calculation on an wlan-network. An antenna has dBi but the pathloss in the air is dB with the formula 100 + 20 * log(km). Can I just mix dB, dBi and dBm?
Here is a sample ...
- 103