All About Circuits Forum  

Go Back   All About Circuits Forum > Search Forums

Notices

Showing results 1 to 24 of 24
Search took 0.00 seconds.
Search: Posts Made By: Marie
Forum: The Projects Forum 05-26-2008, 06:46 PM
Replies: 1
Views: 985
Posted By Marie
Electrolytic capacitor

Hi,

I'm building a circuit which uses an inverter. The voltage output is connected to an inductor. My problem lies with current flow through the electrolytic capacitor. To ease understanding,...
Forum: The Projects Forum 05-15-2008, 06:15 PM
Replies: 2
Views: 9,253
Posted By Marie
Hi, Yes I did try using diodes but it didn't...

Hi,

Yes I did try using diodes but it didn't change anything. What baffles me is that with 15V I am able to maintain constant supply using the 100ohm resistance while with 75V (three power supply...
Forum: The Projects Forum 05-14-2008, 07:41 PM
Replies: 2
Views: 9,253
Posted By Marie
Half bridge inverter

Hi,

I'm trying to build a filter to eliminate harmonics generated by non linear loads. The operation is quite simple. It uses a force commutated inverter to inject negative harmonics current...
Forum: The Projects Forum 05-14-2008, 07:00 PM
Replies: 6
Views: 1,655
Posted By Marie
Hi, try to look for 6N137. It works well...

Hi,

try to look for 6N137. It works well with MOSFET; i don't know for IGBT
Forum: Programmer's Corner 03-04-2008, 04:31 PM
Replies: 2
Views: 1,231
Posted By Marie
Hi, Thanks a lot. I'm going to try it.

Hi,

Thanks a lot. I'm going to try it.
Forum: Programmer's Corner 02-19-2008, 08:55 PM
Replies: 2
Views: 1,231
Posted By Marie
Matlab help

Hi,

I'm trying to write a Matlab program with the following objective: determine the effect of phase error in the resulting current obtained from
sin(nwt)-sin(nwt+phi).

I've managed to write a...
Forum: The Projects Forum 02-13-2008, 06:01 PM
Replies: 9
Views: 3,587
Posted By Marie
Thanks. I understand what you mean; i've been...

Thanks. I understand what you mean; i've been mixing things.
Forum: The Projects Forum 02-13-2008, 03:46 PM
Replies: 9
Views: 3,587
Posted By Marie
Thanks for the links. In fact, i had already...

Thanks for the links. In fact, i had already read them. The first link about gate driver mentions an isolated power supply. What i would like to know is if with an isolated supply + bootstrapping...
Forum: The Projects Forum 02-13-2008, 03:29 PM
Replies: 9
Views: 3,587
Posted By Marie
Hi, I took note of what you all said, but...

Hi,

I took note of what you all said, but what happen if instead of using an optocoupler, i use an isolated dc supply for Vcc of gate drive. Will isolation still be provided if the gate drive and...
Forum: The Projects Forum 02-12-2008, 04:04 PM
Replies: 9
Views: 3,587
Posted By Marie
Floating ground

Hi,

I need to mount an inverter using MOSFET IRF740. I decided to use IR2111 as gate drive and 6N137 as optocoupler.

For the purpose of testing, i decided to use the circuit attached. The...
Forum: The Projects Forum 02-12-2008, 03:43 PM
Replies: 10
Views: 12,398
Posted By Marie
Hi, It finally worked; it seems that i had...

Hi,

It finally worked; it seems that i had wrongly connected the ground of the gate circuit and the power circuit. Thanks a lot for ur help.
Forum: Programmer's Corner 02-12-2008, 01:19 PM
Replies: 3
Views: 3,567
Posted By Marie
Hi, Well probably i don't know how to...

Hi,

Well probably i don't know how to interprete the graph but there are a few queer things:

1) i'm measuring the supply current which is ac with fundamental at 50 Hz n the graph shows me a dc...
Forum: The Projects Forum 02-11-2008, 12:41 PM
Replies: 10
Views: 12,398
Posted By Marie
Hi, Thanks a lot for all ur advices. I...

Hi,

Thanks a lot for all ur advices. I managed to get output at the optocoupler. However, I still fail to turn on the MOSFET, probably there is something wrong with my gate drive circuit. I...
Forum: Programmer's Corner 02-10-2008, 04:42 PM
Replies: 3
Views: 3,567
Posted By Marie
fft using matlab

Hi,

I had to design a three phase four wire system supplying non linear loads using simulink. The aim was to obtain the harmonic content generated by these loads. I was successful in the design....
Forum: The Projects Forum 02-10-2008, 09:52 AM
Replies: 10
Views: 12,398
Posted By Marie
Hi, well the circuit is quite similar to...

Hi,

well the circuit is quite similar to that proposed by SgtWookie except for the fact that i connected the output of isolator direct to 15V through a resistor of 1kohm before applying it to the...
Forum: The Projects Forum 02-10-2008, 03:28 AM
Replies: 10
Views: 12,398
Posted By Marie
Hi, Sorry, I forgot to mention certain...

Hi,

Sorry, I forgot to mention certain things:

1) the switching frequency is 5KHz.

2) there is a current limiting resistor at the 6N137 input which is 330ohm and the current is about 10mA
...
Forum: The Projects Forum 02-09-2008, 06:59 PM
Replies: 10
Views: 12,398
Posted By Marie
Optocoupler and gate drive

Hi,

I've built an optocoupler circuit to isolate the control circuit from the power circuit.

1) The optocoupler circuit is built using 6N137.

2) The power circuit consists of a MOSFET...
Forum: The Projects Forum 01-29-2008, 06:43 AM
Replies: 4
Views: 5,076
Posted By Marie
Ok I get what u meant. Basically, the active...

Ok I get what u meant.

Basically, the active power filter will be used to eliminate harmonics from power line.

I'm going to sense the harmonics load current and after some signal conditioning,...
Forum: The Projects Forum 01-29-2008, 03:06 AM
Replies: 4
Views: 5,076
Posted By Marie
Hi, Sorry, I wrongly stated the value of the...

Hi,

Sorry, I wrongly stated the value of the bootstrap capacitor. In fact, it is 330nF.

I've posted a revised schematic. Did I get it correctly?

However, I don't understand why there will...
Forum: The Projects Forum 01-28-2008, 05:46 PM
Replies: 4
Views: 5,076
Posted By Marie
IR2111 Gate drive

Hi,

I'm currently trying to build an active power filter. Part of the project consist of mounting a three phase inverter. I'm using MOSFET as switch and to ease implementation, i have chosen...
Forum: The Projects Forum 01-17-2008, 12:45 PM
Replies: 3
Views: 2,287
Posted By Marie
Hi, Thanks a lot. It does work out with the...

Hi,

Thanks a lot. It does work out with the new resistor and capacitor values.
Forum: The Projects Forum 01-16-2008, 08:16 PM
Replies: 3
Views: 2,287
Posted By Marie
Distortion in triangular waveform

Hi,

I'ld need help about the generation of a triangular waveform. I've designed a schmitt comparator to generate a square wave and i use an integrator to generate the triangular waveform.

The...
Forum: The Projects Forum 01-09-2008, 02:43 AM
Replies: 6
Views: 1,938
Posted By Marie
Thanks been there; indeed the pot has resolved my...

Thanks been there; indeed the pot has resolved my problem.

About the 150Hz signal generator

Sorry, i am new to forum and i can see that i'vent explain myself clear.

Well in fact, i want to...
Forum: The Projects Forum 01-08-2008, 08:52 AM
Replies: 6
Views: 1,938
Posted By Marie
Attenuation in notch filter

Hi,

I'm currently working on the design of an active power filter and i've to use a notch filter to eliminate 50Hz component. I've managed to get a twin T notch circuit which in simulation is...
Showing results 1 to 24 of 24

 
Forum Jump

All times are GMT. The time now is 11:45 AM.


User-posted content, unless source quoted, is licensed under a Creative Commons Public Domain License.
Powered by vBulletin
Copyright ©2000 - 2014, vBulletin Solutions, Inc.