Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [loss]

99 questions
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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 well with the actual behavior. In case anyone…
tobalt
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Dual active bridge converter

I'm having issues calculating the power losses associated with the operation of a bidirectional isolated dual active bridge DC/DC converter. The converter is controlled using phase shift modulation (PSM.) The converter is shown below. There are 4…
mr313
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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 without loss. If it could, it would violate…
tobalt
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Safe shutdown/restart Raspberry Pi due to a power loss

I am a total beginner in electronics so I need your advice. Does this simple circuit provide for a safe shutdown, with two super caps of 10F? (Original image)
user3206599
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Why do opposing magnetic fields in the same core cause the core to heat up?

I inherited a choke of an odd design, with two windings on the same core. Separately, each winding was about 30 uH. In series, they were about 90 uH. When used in a split-bus boost converter, one winding was in the positive leg, and the other in the…
Stephen Collings
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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 can get (maximum) over specific distances. For…
Brandon Kellett
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Definition and Explanation of Insertion Loss and Return Loss

I'm trying to understand the physical meaning on Insertion Loss and Return Loss on a transformer, specifically RF transformers. The values are often quoted as figures of merit in datasheets, but I'm having trouble understanding how these values…
iwantmyphd
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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 Maximum amps for chassis wiring is 3.5A. I am not going to be using this cable in a…
Neil Dey
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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 the loss tangent of the dielectric? Some…
Rocketmagnet
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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}=\frac{(0.8)^2}{(0.95)^2},\$ so \$P_{L2}=P_{L1} \times…
shineele
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Flyback transformer core heating up

I am designing a discontinous conduction mode flyback converter, 100kHz using UC3844 IC with the spec. 220V,50Hz to 5V 5A. The issue is that after testing it for an hour, the transformer starts heating up (tried with different cores.) Ambient…
Div-lcr
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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 a potentiometer. I plugged in a solar cell with about…
Crackl1ng
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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) losses on the conductors themselves. I don't have…
JRVeale
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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 driver which is supplied by \$V_{\text{dd}}\$ and…
KiDMiO
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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 than highly resistive cables. However this is not…
untreated_paramediensis_karnik
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