Rapid Battery Charging

[arash_tah]

Hi andig
your work look great
Can u share sch and firmware

[andig]

Dear Arash,

I run a design house and develop designs for my clients. So most of the time it is their intecllectual property. However there can always be exchange of ideas. So feel free to discuss..

[arash_tah]

OK Andig
I have some questions regarding thyristor phase control rectifiers. First I don't know how to design a stable loop for feedback control in other words how to adjust the parameter of controller for example PID controller?
Is ther any mathematical model for matlab simulation or an average model for using BODE analysis
Do you have any articles or books regarding these problems

REGARD

[tAhm1D]

Hi Sougata,
Your one seems to be for Battery Bank. My requirement is less, just for a Battery of 100/150AH. I made one and it look very simple with 8 Pin PIC12F675 and it does not require much hardware.

[andig]

Dear Arash,

As far as the control scheme is concerned I found that sliding control is most easy to adapt. It does give you an error deadzone effecting output voltage accuracy. The system response can be under-damped though. Since the average rectified voltage is an inverse sinoid an s curve correction through lookup table is needed. You get ample time as each firing gives you 10mS of time for 50Hz. I do not come from an engineering background and a self-taught. I am not aware if a model is available for BODE analysis or for simulink.

tAhm1D you guessed it right. It was for 55 battery bank system.

[HackerNo.1]

Hi Sougata of Andig,
The Picture you have posted seems to be very bulky and unlike Microcontroller based one. Phase Control for Battery Charging is a very easy technology and many producers of your and my country making it, though few with Microcontroller. Using internal ADC/Comparator/CCP Module, without much theory,with a  Microcontroller, it can easily be made. For inherent shortcoming, this phase control method is discarded in Advanced Countries. Advent of Microcontroller opened up new new avenues for rapid charging like Pulse Charging etc.

[andig]

Hi Hacker No.1,

It is not only a battery charger but a complete DC supply cum distribution panel for a factory's control protection relays. It has more than 10KVA of output. Yes it is bulky.

tAhm1D the attachment can be useful for you.

[MAXPAYNE]

andig,

couple of figure is missing !!

[andig]

Hi tAhm1D,

I downloaded it and sent it as it is.

[tAhm1D]

Hi,
I have read the Article earlier. This is one idea regarding the Pulse charging method. But I read one Article where it is written that though complicated, but with proper application, quick and rapid charging is possible and the method is safe for battery life. May be the method is not an open source and those using are not disclosing the proper method and outsiders are discussing with assumption. It requires further study. I have not tried it and not sure about the system.

[myheadhurts]

Hi tAhm1D,

I havent read the relplies in this post so forgive me if its already mentioned....but there are some usefull datasheets on the unitrode website..

http://www.unitrode.com/products/apps_prt.htm

I did a fast charging hi C battery charger  for LA and SLA and I used some of there app notes to get my head in gear. There was a complete series of papers on battery cahrging on their website which I cant see there now(since TI bought them)..I've got them saved somewhere and I'll dig em out and post them if you want.

THe charger used a rectifier bank(no capacitor) then thyristor to deliver 100hz phased controlled pulses at upto 200A to the battery banks with high side voltage and low side current monitoring..

Rob.

[tAhm1D]

Hi myheadhurts,
The consolidated list of applications of Unitrode provided by you will be of great use for me. I was searching it but could not get it through google. Lot of useful informations regarding SMPS are there.
I would also appreciate it if you could post the app notes for battery chargers from Unitrode that you mentioned that you have saved. Your cooperation is highly appreciated and welcome by me.

[myheadhurts]

quote "I would also appreciate it if you could post the app notes for battery chargers ."

I'll do that .... Can files be uploaded directly here or will I need to load to RS and post a link.?.

Rob

[tAhm1D]

Hi,
I think it is better to upload to file sharing site and  it will be easier for me to collect if you can upload to ifile.it/mediafire/4shared and then post the link.