Questions tagged [loss]
The loss tag has no usage guidance.
79
questions
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1answer
73 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 ...
1
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0answers
71 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
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1answer
62 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
3answers
130 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 ...
1
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1answer
59 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 ...
2
votes
2answers
64 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: ...
0
votes
1answer
37 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 ...
-1
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2answers
68 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
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1answer
42 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 ...
0
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1answer
25 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 ...
2
votes
1answer
187 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 ...
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1answer
92 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 ...
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3answers
100 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 ...
0
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1answer
42 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 ...
3
votes
0answers
53 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 ...
0
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1answer
25 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 ...
0
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2answers
94 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 ...
4
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3answers
795 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}=\...
2
votes
2answers
60 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 ...
0
votes
3answers
358 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 ...
0
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0answers
76 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 ...
2
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0answers
43 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 ...
0
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0answers
54 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 ...
0
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0answers
50 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 ...
0
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0answers
62 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 ...
0
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0answers
31 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
vote
1answer
64 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 ...
0
votes
1answer
77 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,...
3
votes
7answers
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
2answers
511 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 \$ ...
0
votes
2answers
436 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 ...
0
votes
1answer
79 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 ...
2
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2answers
112 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 ...
1
vote
1answer
53 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, ...
2
votes
1answer
441 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 ...
0
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1answer
86 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
2answers
83 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 ...
0
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0answers
50 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 ...
0
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2answers
157 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
votes
2answers
14k 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 <...
0
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2answers
336 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, ...
0
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3answers
109 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 ...
1
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1answer
1k views
The effect of rust on a transformer core
I want to make a transformer with a core of laminated electrical steel sheets. I have some EI core sheets, 0.5mm thick. My design is for a gapped core transformer, and the shape of the gap is unusual, ...
0
votes
2answers
216 views
Power losses in long wires with multiple loads
I need to calculate power losses in long wires. I managed this for the case of constant currents. But in the real world, my loads are DC-DC regulators.
The load draws 11W of power, network voltage is ...
0
votes
1answer
38 views
Maximum tolerance for a loop trace-antenna's capacitor
While going through the document at https://www.silabs.com/documents/public/application-notes/AN639.pdf I have read from "Figure 13. Loop Antenna Simulated Mag(Zin) vs. CP1" below that even a 2% ...
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1answer
2k views
Friction Coefficient of AC motor [closed]
Does the Friction Coefficient "B" of AC Motor changes with the change of a load connected to an AC motor? OR it is always constant?
0
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1answer
129 views
Effective or minimal area of core to calculate losses?
I've got a problem regarding the information given in coil's datasheet (PQ35/35: http://www.ferroxcube.com/FerroxcubeCorporateReception/datasheet/pq3535.pdf). There are two different areas given: ...
0
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1answer
73 views
Is it important to consider channel bandwidth of the signal to measure cable path loss for RF testing?
I am performing some RF tests for 802.11 and measuring path loss of the RF test setup, it has a mix of PSK & OFDM signals. I see the norm is to use a Continuous Wave signal to perform RF path loss,...
0
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1answer
207 views
Do I need to consider shunt admittance for line losses doing load flows?
If I have a long transmission line (Pi model) the current just go through the equivalent impedance of the line, but I've seen demonstrations that include this shunt admittance as if the current flows ...
-1
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1answer
212 views
RF over-the-air signal loss inside an RF chamber
For cabled/conducted testing, path loss between DUT & Test equipment is calculated from cumulative insertion loss from any adapters, co-axial cables, attenuator pads etc.
But for over-the-air/...
