# Questions tagged [loss]

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70 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 ...
58 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 ...
79 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 ...
90 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 ...
77 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 ...
179 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 ...
62 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 ...
71 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: ...
49 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 ...
112 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 ...
49 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 ...
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 ...
197 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 ...
136 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 ...
144 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 ...
44 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 ...
61 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 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 ...
98 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 ...
883 views

93 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 ...
87 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 ...
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 ...
161 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 ...
19k 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 <...
390 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, ...
113 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 ...
2k 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, ...
233 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 ...
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% ...
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?