Most of the industrial inverters draw harmonics current from the AC power
supply, and this input current is independent of the inverter current.
The input stage (that converts AC to DC) is usually a diode bridge
rectifier.
Günter J. Maass
Researcher - Power Electronics Development
EMBRACO S.A.
List
I suppose that EN61000-4-4, 4-5 and 4-6 do not mention the input voltage to
be applied to the EUT during the tests.
For a product with a voltage range, like 198 up to 264Vac (230Vac nominal),
what should be the right value ?
Or do I need to look for the worst voltage case ?
Thank you for y
List
Suppose I have a small SMD ferrite, to attenuate hundreds of MHz, with very
low DC resistance (0.4 ohms) , placed between the EARTH and the central
point of two Y2 capacitors connected to PHASE and NEUTRAL
Concerning about safety, would I need to change my Y caps to Y1, once they
won't
List
About disturbance power (frequency range 30MHz to 300MHz) from EN55014-1
...
Let me check with you if my measurement procedure is right:
1) The absorbing clamp (I use a R&S MDS-21) has 17dB of attenuation.
But this is not 17dB for the whole frequency range.
It has a correction dependent of
The situation with the two setups for harmonic measurement was solved, and
the problem was quite simple ...
The resistance of the cables used with the watt meter was 0.25 ohms .
Enough to reduce the harmonics sufficiently.
Not using the appropriate cables was a basic mistake... but I am happy to
Hello
"Take care to bridge the rectifier diodes
with capacitors, otherwize thay might create interference themselves."
Does anybody have some material (papers, book references, etc) about using
capacitors in parallel with the rectifier diodes (with use them, how to
determine their capacitance,
List
I would like your precious opinion about a situation regarding harmonic
current measurement (61000-3-2).
First case:
Using a sinusoidal AC power source, with a controlled output voltage
(almost perfect sine, voltage THD lower than the needed, even with load), I
measured the current harmonic
Duncan
First of all, I would think about your sources of EMI and how they can get
stronger with your PSU warmed up.
Active switches and diodes are EMI sources that can produce more noise when
more energy is dissipated by them.
The conducting resistance of MOSFETs increase with higher junction
te
List
Nowadays, we run conducted EMI tests according to EN55014-1 to household
appliances.
The frequency range is 150kHz up to 30MHz.
Is there any standard or project to impose limits to lower frequencies ?
Thanks
Günter J. Maass
EMBRACO S.A.
---
This m
List
I would like to have your opinions about Surge and Ring Wave Generators,
regarding their quality and reliability
These are some models that I am focusing:
- Keytek ECAT - modules E501A, E503 and E551.
- EM Test UCS500M/6-SUR with RWG500M/6
Any good or bad comments and stories about these
List
I would like to have some comments from the list about the 2001
International Symposium on Electromagnetic Compatibility.
I have never gone to this symposium.
My question is about the subjects covered.
Are the subjects more technical (from institutes and Universities) or
practical (from the
I would like to thank all the comments you have done about the analyser.
With this, I will study this subject with a little more precaution.
Technically, this device seems to be very easy to use and with issues that
would help (floppy disk, color screen, digital features, etc ...)
But the technic
Fellows
I am looking for a spectrum analyzer for EMC pre-compliance.
The Agilent E7401A is an option we are studying.
Does someone have any comments about this equipment ?
Did someone have experiences with this analyser, and want to share some
good or bad aspects ?
Thank you all
Günter J. Maas
Thank you for all the suggestions.
Your replies added very good options for the course I am looking for.
Günter J. Maass
Power Electronics Engineering
EMBRACO S.A
Brazil
gunter_j_ma...@embraco.com.br wrote:
>
> Colleagues
>
> I am looking for short (a week ma
Colleagues
I am looking for short (a week maximum) EMC courses in Europe during 2001.
Topics of interest are :
- EMC Design principles;
- Suppression techniques for Burst, conducted EMI;
- EMC x PCB design;
- Measurement environments and testing (laboratory setup);
- EMC standards (for Europe);
I think I solved my doubt with your help, and reading carefully the
IEC60335-1.
This was my conclusion so far:
IEC60335-1 says in page 177 (item 29.1):
For conductive patterns on printed circuit boards, except at their edges,
the values in the table between parts of different polarity may be red
Hi group
A question about clearance and creepage distances indicated in IEC60335-1.
The table 13 shows limits of 3mm (creepage) and 2.5mm (clearance) for a
working voltage > 130V and < 250V.
I still didn't find out if this voltage is RMS or peak value.
Anyway, considering a Flyback converter, I
Hello group
The EN61000-3-2-A14 was published and released many products to comply
with the Class D limits. But I have a doubt for a "powerful" situation.
Does anybody know a standard (published or under discussion) for
harmonics limits that is applied for equipments with an input rms cu
Group
As mentioned in Cenelec Press Release of 12 October (Ratification of
EN61000-3-2 - Amendment A14), the date of announcement was 01 December
2000.
Could anybody confirm if it was announced ?
Thanks
Günter J. Maass
Eletronic Researcher
EMBRACO S.A.
Phone: 55 47 441-2717
Fax: 55 47 441-2730
A question about the famous 61000-3-2.
What should I consider if my equipment works with an input power less
than, and sometimes above 600W in normal conditions ? Will my equipment
need to mute to comply with class A and D !? :-)
Thanks.
Günter J. Maass
Eletronic Researcher
EMBRA
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