Newbie
Joined: 03/11/2017
Location: RomaniaPosts: 2
| Posted: 10:32am 04 Nov 2017 |
Hi, i'm new here and i was atracted to this discussion because i was invertigating what could go wrong with my newly bought egs002 modules with IR2013 and how should i improve it before i would fire it so that it won't fail.
So please help me understand the details of this kit !
R27 is missing on my modules too, it's only weird that one module has a 2nf for C19 , while the other has no capacitor for c19.The values are a bit off than the original values but they seem to work. After reading all this article i kinda understand why.
Please let me explain what i want to do with it and maybe give me the best ideas, but please don't laugh at me if it sounds silly!
I want to use one of the modules to drive a 13 watts/220v ac hysteresis sincronous motor that spins the platter of a good vinyl turntable .That's exactly what i need to drive: a 13 watts motor , no more than that.
I built first a system that had a step down transformer, an audio class ab amplifier driven by a variable 40...81hz sine oscilator based on xr2206 and another step up transformer to drive the 220 v ac motor.I took the feedback for the audio amplifier from the primary of the step-up transformer as it was more stable and gave less vibration to the motor.
That controller was 10kg and lost 40w of heat on the heatsink to be stable enough.Well...some audiophyle guys still consider that aproach the best, but i find it silly.
I thought of a radical change, to use a VFD system that would be small enough to get inside the turntable and would operate straight from the mains 220v(230v).
EGS002 looks perfect for that.It may not allow me find the perfect speed as the output has descrete values but at least i hope it will provide me a perfect 50hz sine voltage.
I read all this article and thought to use 2SK1119 as output transistors, the smallest i have to do the perfect job.The motor takes just 60ma.
I thought though that the NO IFB solution and either the TFB or just 5v power-on/off controll would still be great as i don't want to have any problem with the turntable motor which is kind of a rare and expensive one in terms of very low vibration specs.
My first concern is the fact that if you lift the IFB pin you need to ground the op amp input to have the IR2013 ON and i don't know if you did it.
I also thought to ask if all these problems you mentioned have anything to do with the fact that the IFB output is not only driving the SD pins of ir2013(in my case), the SPWM soft start if the r27 is in his place , but also the IFB input pin 14 of the eg8010.
It may be the case that there are too many superimposing events that stop this module to work great.So if the spwm is disconected might be also because the ifb pin 14 is doing something too to shut the system down.
Another point is that if you let the R27 disconnected C30 is just 1nf series with 10k and maybe the soft start needs to be a bit longer .
The opposite of it is that if r27 is at his place should it be a short as we have a 1nf capacitor on the op-amp output?
Another aspect i would like to adress is the fact that i would preffer the output transistors to be separated by transformers from the drivers or at least the drivers to be separated from the eg8010 so that no mistake happens.What do you think about this aspect?What do you think it would be the best aproach in terms of total safety?
I am sorry if my english is not at it's best and also if my electronics knoledge isn't that good.