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I Need to implement a low pass filter in an FPGA. I am very confident with FPGA's and DSP theory. I am not confident in selecting a DSP filter.
My A/D's are sampling at 1MHz. I want my low pass to be at 100Hz. The problem i am noticing is that 1e2/1e6 is a small number and the actual...
Orson thanks for you comments, i would like to know more, how do they isolate the opamp that is sensing the Vprimary? Using an LEM? opisolator? isolated opamp?
After further thought, you are correct i cannot detect dc component using a aux coil. I am going to run my primary currents through...
If you apply 202 volts for half a cycle and -200 volts for the next half cycle, there would be a 1 volt DC component. I want to measure that by using a LPF on the aux winding which is coupled to primary, i should see that same wave on aux coil and be able to detect the offset.
Hi,
I am driving a transformer at 15khz with a square wave of +-200Volts. I wound a auxiliary coil on the transformer to measure what is applied to the primary. I want to be able to detect a DC component in the voltage that I apply to the primary and correct it in the next cycle by applying...
as you know i have been trying to pass emi for a while. it seems all the noise is coming from my output. if we wrap the output wires twice around an ferrite then we pass radiated emi. if we dont wrap the output with ferite then we fail by 20dB. i was looking at the output with real short...
ok question , still wokring on my flyback. how to you quantize how clean the output is? i look at output unloaded and it has about 40mV p-p ripple. but if i load it up to 2A then the ripple is like 400mV and the output starts to have a lot of HF noise. what do i do? i already have a LC...
a 1500v mosfet is on the heatsink!
another quick question. is a 100V schokty a high V rating for a 12 volt output?
otuput current is rated at 3 so i am using a 5 amp part but jsut wondering if a 100V schotty is good enough V rating?
i talk to another engineer and he agrreed leaving primary...
i did not pass first round of EMI testing so i have some questions.
since my primary GND is floating do i need to tie it to Chasis GND somehow?
Do i also have to tie my secondary GND to chasis. The secondary gnd is the gnd on the DC of the flyback.
I have a chasis gnd connected to my heatsink...
VVV i was wondering if you are still around. I am looking for some advice on power supply layout. We have a problem and we are not passing EMI conducted or emissions testing. I know the basics like keep the power switching loop as short as possible but is there a book or hints i can have for...
i have researching last couple of days and i am having trouble figuring out what i am goign to do
i have a 1500v mosfet from ST and i want to clamp somwhere around 1200-1300 volts to protect the mostfet. the mosfet is hooked up in a flyback config so there is a chance of votlages greater than...
devura could you elaborate on this please for me. Basically i have a 1500 volt mosfet i want to protect and i would like to clamp around 1200-1300 V
thanks
I have to rate my parts at 1500 v for my current project but i am having trouble locating a diode rated at 1500v 1a so i was wondering if it is ok to have two 1000v 1a diode in series for a RCD snubber in a flyback setting. Any help is greatly apperciated! Thanks.
I am looking for some good information on creating, theory behind it, praticallity of chasis and earth ground. I have seen how it is done in some cases but i dont understand the purpose of it. I also dont understand how to properly create a chasis or earth ground. Please post any good ebooks...
lm3488 sepic
I recently designed a LM3488 in a sepic configuration. I am noticeing a whine though at input voltages greater that 16 volts with a 1 amp load. The whine increaes pitch as the the input voltage increases. I am using 3.3uH inductors. What would cause a whine? Any sugestions on...
Linaer Controls question
i am having trouble with a problem i am trying to work on from a linear controls system class.
Problem statement.
given system x'=Ax and A is a 2 by 2 matrix suppose that
x(0) =[0 1]' x(1)=[1 0]' x(2)=[0 -1]'
find e^A
i have been looking through my controls book and...
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