New answers tagged

1

120 Hz as a test frequency is close enough to 60 Hz to get reasonable results. The problem when measuring transformer leakage inductance is that you cannot avoid measuring the combined primary and secondary leakages of the transformer i.e. you measure a composite number either referred to the primary (when the secondary is shorted) or referred to the ...


1

Thermal modeling is a good application of electronic modeling methods that is also necessary directly in most electronic design. There's no analog of inductors in thermal modeling, but resistors, capacitors, and even transmission lines are useful, especially if you are modelling dynamic situations where you may have power varying as a function of time. For ...


-1

I've designed a few multi-domain systems e.g. A nodding mirror drive, where the inertial energy was swapped back and forth to a storage capacitor in a semi-resonant manner for high effiency. Vibration and acoustic noise cancelling/attenuation methods for aircraft and helicopter mounted metrology systems. Refrigeration and environmental control of airborne ...


1

I'm pretty clueless when it comes to EM simulations and viz. However, I did spend some time in biophysics and geophysics- and in general I noticed that the other scientists (the smart ones lol) would tend to focus on the lowest dimensional representation of their problem domains that still encapsulated the essence of whatever dynamics they were studying. ...


1

But when I simulate it with the circuit above it only acts like a buffer Try adding the resistor in the green box below: - You need to make the right hand op-amp a proper differential amplifier as used inside such devices as Instrumentation Amplifiers: - Note that R3 in the above circuit is the addition I made to your schematic.


5

Where does this mathematically come from? Starting a sinewave from any point in its waveform is creating a transient. Prior to the sinewave being present there was 0 volts then suddenly you start-up a sinewave. This creates a transient response in the LC filter and, because it is highly resonant (limited only by any parasitic elements LTSpice defaults to), ...


0

From the VITAL_Timing package source: PACKAGE VITAL_Timing IS TYPE VitalTransitionType IS ( tr01, tr10, tr0z, trz1, tr1z, trz0, tr0X, trx1, tr1x, trx0, trxz, trzx); SUBTYPE VitalDelayType IS TIME; TYPE VitalDelayType01 IS ARRAY (VitalTransitionType RANGE tr01 to tr10) OF TIME; The index type ...


0

I seem to be getting something pretty close to the datasheet: but I had to probe immediately after the pin for the output (V(x)), otherwise there would have been some 18 dB missing (V(o)). The input is also a more meaningful 0.1 V (accounted for in the plot window as *10). Another thing that's corrected from your schematic is the proper use of an input ...


0

According to the Datasheet of the AD8337 (Rev. D), page 21/28 under section Gain control considerations: The offset voltage effect of the AD8337, as with all VGAs, can appear as a complex waveform when observed across the range of VGAIN voltage. Generated by multiple sources, each device has a unique offset voltage (VOS) profile while the GAIN input is ...


0

Use a free vendor FPGA development IDE package. E.g. Lattice Diamond, which comes with a free cut down version of the very excellent ActiveHDL VHDL & Verilog simulator. If you write your Verilog or VHDL code using generic logic and avoid vendor macros you don't get tied to a specific vendor. If you have to use vendor macros write wrappers for them so ...


0

Logisim is a free, open source digital logic simulator. It is commonly used in education, and can quite easily be used to design and simulate simple CPUs. For more complex CPUs, hardware description languages (Eg verilog or VHDL) are more commonly used than the schematic based approach of logisim. Open source simulators for these are also availabke (Eg ...


1

Everybody uses simulators for this purpose. Two that are freely available and widely used are Modelsim (free version may have limited functionality), and Verilator (completely free, can be faster, but less functionality).


1

It's due to reverse D2 current leakage.


1

The stator phases aren't grounded. They should be tied in the middle together in a wye configuration, with each phase feeding the rectifier. So replace the three grounds on your voltage sources with a single net, but don't ground it. You effectively do that on the right-hand schematic so long as you don't also ground the (-) output of the rectifier. The left-...


1

MOS1 is backwards, so right now the output voltage will just be the input minus the voltage drop from the body diode. It is, however, the correct type (you should be using an N channel FET, not P). Typically you need a high-side gate driver with a bootstrap capacitor to use one though. I recommend operating the converter in open loop at 50% duty cycle. ...


1

It's important to note that a rectifier's positive and negative outputs are the highest and lowest voltages from the input respectively. That mean that the negative output isn't ground. By grounding the negative output in the right circuit, you short any input that has a negative voltage. You can still use the circuit on the left but you need to set the ...


0

Your MOSFET MOS1 is in the circuit the wrong way round so it's just acting like a diode. If you flip it 180 degrees, it should work as expected.


1

You are using an N-channel device as your pass transistor when you should be using a P-channel device in this type of circuit configuration. Look at the parasitic diode component across MOS1 - you can see that it will be conducting all the time. Change it to a P-channel device like this: - As for not finding an isolation component in PSIM, you should be ...


2

Basically two things: - -180 degrees is the same as +180 degrees and you are seeing that step change as something important but it isn't. It's just a continuation of the phase as it passes from -180 degrees to +180 degrees Your circuit simulator uses a real simulated op-amp hence there will be things about it (such as the phase shift extending past -180 ...


Top 50 recent answers are included