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hello, anybody. please see the attached picture. and this pic is from the fairchild application note an3001.
as to the equation: IFT=VF/R2, and i donnt know why to calculate it like this. the current IFT should equals to the sum of the current fron the R2 and the internal LED of the opto, but...
thanks for ur reply.
assume that the waveform of the shunt resistor is sinusoidal which is centraled at zero. in this condition, how about the pin7 output? i know the waveform is sinusoidal now, but which is the center line of the waveform? and how about the output of the mc34082a? which is the...
hello, anyone. i meet with a problem recently. as u can see from the picture.
let meassume that: the current through the shunt resistor is 20ARMS 50hz sinusoidal waveform, and the resistance of the shunt resistor is 5mohm. and now my question is:
1:what is the output of the pin7 of the...
ok, what about the inductance of a length of 0.5m straight wire which is 50mm, i mean, µH level or nH level, 10µH,100µH, or 10nH, 100nH and so on.
from ur equation, we can get that:
cause s equals to 50mm, so the diameter is :d=s√[(4s)/3.14], and the length I equals to 0.5m.
so we can get the...
hello, FvM, see u again here.
u mean it cannt test the inductance of a wire which donnt have a current return path?
but what is LCR meter for, i think it can test resistance, capacitance and inductance accurately.
but i just donnt know how to set the value of the LCR meter, such as frequency...
from the datasheet of the cm1400du, the maximum VCE is 1200V, it seems that the the VCE voltage is about 1250V(5*250) which exceeds the rated value a little.
and i think it is no problem.
and this is an artificial test, please see the attachment, it is the experiment setup.
by the way, have u...
hello. i recently in the process of the igbt short protection. but i meet with a little problem.
my igbt driver CANNT protect the igbt when the igbt is in the short circuit condition.
i use the VLA500-01 driver which is from isahaya, and the igbt module is CM1400DU-24NF.
the attachment is one of...
hello, can someone tell us how to test the inductance of wire.
the length of the wire is about 0.5m, and i have a LCR meter.please tell me test the inductance of the wire step-by-step,especially how to set the LCR meter.
thank u in advance.
---------- Post added at 03:57 ---------- Previous...
hello, anyone . recently ,i am designing a igbt short circuit protection. but i meet with a problem. the driver i use is vla500-01 which is from isahaya (japan), and the module i use is cm1400du-24nf which is from mitsubishi. and my simplified test setup see attachment.
first, i charge the...
yeah， that's right now.
wow, the problem is finally solved. and the right formula to be used for the circuit are:
1:Av = 1 + R4/R3
2:Fo=1/(2*3.14*√(R1*R2*C1*C2))
3:Q=√(R1*R2*C1*C2)/(C2*R1+C2*R2+C1*R1(1-Av))
if someone has any doubt about them. just "speak" it out.
by the way, thanks...
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