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This question is not pertaining to any datasheet but philosophy of PLL. I was referring to the link . I found the following statement "When the PLL, phase locked loop, is in lock a steady state error voltage is produced. By using an ampli
The circuit makes no sense. Why would you connect L and C in series with the fan motor? A possible capacitor application would be for a "capacitor-run" single phase motor with two windings.
Hi, I donīt think it makes sense to perform any calculation on unspecified sample values. Some do voltage readings with 100Msample/s on a clean DC reference voltage. Some do 15 minute average readings on 3 phase AC power grid voltage. Completely different data without I could upload data of 20ms RMS mains AC voltage readings. You will see a
The phase curve doesn't seem to make sense at first sight. How did you capture it? Which LT switcher IC/Eval board is it?
The Laplace transform is used for the VCO transfer function. Such a function is defined for linear conditions only. Therefore, it applies to the PLL under locked condition only - and this is the key for an answer to your question: The PLL linear transfer function - hence, also the VCO function - is defined in the phase domain only. And for the vol
Hello, Please can you confirm that the use of a Unidirectional Current sense Transformer (CST) as shown on the first page of the UCC28950 (phase shift full bridge converter) datasheet is totally wrong? (It is a phase Shift Full Bridge converter and the Current sense Transformer should instead be a Bidirectional Current (...)
i am measuring 3 phase voltage using pic micro , for that i am scalling 440v to 1.5v using resister 2.2meg and 6.8k. every thing works fine i can see the 3 phase voltage on lcd but if i disconnect 1 phase in the 3 core wire i can see some leakage voltage present the line tester glows bot very little current if i touch in hand no shock. my (...)
Hello i am working on 3 phase ACIM drive. now i have to work on current sense so that motor could not get damage under overload and short circuit condition. my question is which is best method for current sense. 1) Hall effect sensor for AC current measurement at output phase 3) CT current sense at (...)
here is ltspice simulation of circuit grid tie inverter, ltspice is free. You do not need to always sense the mains, you just have to know when is the zero crossing, then you shovel in your sinusoidal current in phase with it. You need to have a dc supply of voltage higher than the mains peak, so that you can always shovel power into the main
Can you tell me how such a filter can compensate for leading and lagging actions of the input signals ? No, because the statement doesn't make sense. A "lag-lead" loop filter (lag-lead because the pole comes before the zero) acts as a low-pass filter without reducing the loop phase margin too much. It's necessary because the VCO
Hi guys, i am using micro controller arduino uno to produce 3 phase PWM pulses by using DDS method available online. the PWM pulses will be fed into a ....... your description didnt have any info on the feedback pulses from bldc.(hal sensor) did you sense it and control the bldc? [SIZE=1
Yes, but I'm not sure what you are trying to achieve. The circuit uses phase control so either you have to use the PWM very slowly, like an on/off switch to control the average output power to the load or you have to synchronize the PWM to the zero crossing of the AC and set the trigger points within a single cycle of the AC. You do not show
The S-parameters obtained from the simulation do not make any sense (Figure2). How can you know? You have magnitude only s-parameters, phase is unknown. Thus you can't predict if superimposing signals at multiple input ports will increase or decrease the magnitude at a certain frequency. Presumed you are modelling a linear sy
The term "lock-in amplifier" doesn't exactly match the application, but a complex impedance measurement with phase sensistive rectifier is perfectly suited. In addition a measurement circuit that is insensitive to cable capacitances, e.g. voltage source/current sense. That's how all AC impedance (LCR) meters work.
Hello, We are using the ML4425 3 phase inverter controller IC for driving a BLDC for water pumps which form an irrigation system for Tulip Fields. All we need is for the pump motor to spin at 8000 RPM. We will bypass the ML4425?s current sense by grounding the ?Isense? pin?we will then control the current which feeds the (...)
What is the center frequency, required bandwidth (given certain VSWR), available space, maximum attenuation, input power, phase delay, preferred technology, etc?
Hi All, I wanted to use an oamp and measure the phase between voltage and current. I need to view this on an oscilloscope. I wanted to measure the phase shift between V & I circuit with an inductor load for a 100Khz sinusoidal signal input. At present I used a current sense method by putting a 1 ohm resistor at the output of a (...)
Hi to all. I hope this explanation makes sense. I'm using a pic24fj256ga104 to control an AC motor using a triac. Speed control is achieved by varying the firing of the triac with respect to the zero crossing. phase control I think it called. It is all working as expected. The issue I have is I'm sure I've made a "mountain out of a moll hi
I need to know the basic of energy meter. Last Day I opened the energy meter box just to know what inside works and how. Initially I find a shunt connected across the phase and a CT on the other hand. After a lot of goggling and discussion,I got a brief idea about the basics of energy meter but I want to know why they use CT. At internet it shows i
I don't believe that the phase response is correct. It's impossible to achieve. A physical plausible phase response is e.g. shown in Figure 22 of the TPS54331 datasheet. In contrast to the plotted response, there will be an additional phase lag caused by the average PWM modulator delay.