# Questions tagged [losses]

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### RCD snubber loss in flyback converter

I have few queries in analyzing the curves. Below is the flyback converter with RCD snubber circuit and waveforms. When the FET is turned ON, there is no primary current flowing through snubber as the ...
• 25
39 views

### Power loss in transformer windings

I am having a confusion while designing the transformer for my smps design. I am in the initial stage of setting my equations for the transformer. I have been following the slides from the ...
• 673
90 views

### 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 ...
104 views

### How to create a frequency-dependent device with low losses at 50/60 Hz and high losses at 100 kHz

I'm working on a device to dampen high-frequency transients. Here are the specifications: Rated current: 30 A RMS Losses at low frequency (50/60 Hz): <10 W (required steady-state condition) Losses ...
• 1,370
82 views

### Characterize ferrite cores, e.g. core losses

How can I characterize ferrite cores? I can measure saturation, but how can I measure core losses so I can decide what frequency to run them at? I could charge a primary winding to a certain current, ...
• 199
20 views

### Calculation of Load Impedance of three phase Inverter

Could anyone here please assist me how the Equivalent impedance of Load of three phase inverter is calculated from the Inverter parameters shown in below screenshot? This screenshot is tutorial ...
• 347
868 views

### Is copper loss present in the winding of an autotransformer?

Since the autotransformer transfers power conductively in addition to through its magnetic field, does its winding also cause loss of electric power in the form of copper losses? It seems to me that a ...
• 33
126 views

### Suggestion on core calculation with air gaps

I was working with the SMPS transformers and found a transformer that had a small air gap already there and was used in charging system of a battery. I wanted the ferrite core for my own transformer ...
• 673
123 views

### Calculating power losses in a wire based on frequency

It's been years since college, and I'm drawing a blank on this: If I use a 12AWG wire (say a 0.083" diameter bundle of .0125" uninsulated strands) to conduct power at 25kHz to a device, how ...
66 views

### MOSFET body diode current rating vs Schottky diode

How is it possible that a MOSFET's body diode in a TO-220 package, such as the N-channel IRL3803 or P-channel IRF4905, has a much higher average/continuous current rating than a high-current Schottky ...
• 51
1 vote
149 views

### Help with intuitive understanding of these transformer iron/copper loss equations [closed]

I have been going through the Handbook of Electricity Metering (11th edition) for my new job. They give the following equation for transformer watt loss due to core/line losses. I am not an EE so this ...
474 views

### What is wrong with my double pulse test setup in LTspice?

I am trying to make double pulse test measurements in LTspice using the spice model of a MOSFET and gate driver we are using in our actual design. My setup seems to be not working as nothing is ...
• 347
1 vote
264 views

### Conduction losses calculation of a SiC MOSFET

I have a question regarding conduction losses calculation of a SiC MOSFET. What I found in different research papers and in application notes is that you calculate the power dissipated during forward ...
• 347
122 views

### How do we maximize core and winding losses in an electromagnet (and calculate them) for variable DC input?

Bigger Picture: Imagine a magnet approaching the solenoid with some initial constant velocity on $v_0$ on x axis. The approaching magnet will induce an EMF and induced current in solenoid. We want ...
166 views

### IGBT and SiC MOSFET conduction losses

What is the actual reason behind IGBTs having lesser conduction losses than SiC MOSFETs? For the same application, I can see that an IGBT having the same power rating exhibits 10 times more switching ...
• 347
157 views

### Reverse Conduction/Third Quadrant operation of SiC MOSFET

Good Day, I have to calculate the Conduction losses of SiC MOSFET and how I am calculating total losses is by segregating the losses into three categoriesincludes, Forward Conduction loss of MOSFET, ...
• 347
We all know that for Joule losses $P_j = V(t)I(t)$, and the integral form is $P_j=\iint \rho j^2 \, dV$. When trying to do some integrals, I found this expression in a document: P_i = \frac{1}{...