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# H.V. CAPACITOR CHARGE INDICATOR Answered

CAN ANYONE HELP ME ABOUT HOW TO PUT A VOLTAGE/CHARGE INDICATOR on flash/High Voltage capacitors using LEDs - Thank You.....!!!!!!!

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Okay, I don't know what kind of indicator you want so I made a schematic of a very simple indicator, I hope you can understand it and find it helpful. Another indicator you can use is (that what I use right now) is a cheap voltmeter, the voltmeter give you a much better idea how well the capacitors are charged. If it does not help or not what you are looking for, just reply me.

so, I have a question. How did you got the resistor value? I wanna this schematic, but with another values of capacitors. if has some formula or calcas, please explain-me

Usual method, simplfied. Assume diode current = 20mA, resistor = supply volts/diode current.

Hey Dude, By the way, do you know how to increase or double the voltage output of a converter like those voltage doubler or tripler? cause my converter charges 3 caps in 10 min. and it is slow compared to those I have seen on many coilgun sites. Does increasing the voltage increases the charging rate in just seconds lets say about 5 to 10 sec. not in minutes? my converter output is 422v max... Thank you for reading and for your kind consideration and for your time..... :p

I can help you if you answer those questions... At what voltage do you wish to charge your capacitor with - 800v? And does your convertor output AC voltage and does it have a transformer?

OK, Just what I have said my boost converter's output voltage is about 422v max 450 if I got lucky. My converter's core components are as follows: NE or LM555 timer, 141uH Toroidal Transformer(An Inductor), IRFP440 rated @ 400v 10A (Its supposed to be IRF450 rated @ 500v 14A but its not available), 400v 6A diode - 2 of them in parallel to make a 400v 12A (Its supposed to be SFA1608G, 500V 14A its not available also) and a Voltage comparator - Dual or single comparator can be (I used an LM393 or LM311). The output voltage was in D.C. thats why I don't use my other volt panel which was in A.C. Maybe 500v or 600v would be a satisfying to me.... but does increasing the Voltage output also increases the charging rate and doesn't it have an effects on the capacitor bank? you know they might get damage since I'm charging three 400v 200uF capacitors for the mean time and I wanted to increase the voltage output for a fast charging rate...... I can try to upload you the schematics that I got through searching online and maybe it can help you to some other aspects hehehehehe :P

Okay, I can see what your converter is, a DC boost converter, I am afraid making it give out more current and/or more current is not possible... However, I have one (crude) HV power supply in mind, but it requires mains power... So if you could tell me what voltage your mains power gives out, and I will draw you a schematic how to build a HV power supply.

Hmmmm..... mains Power? do you mean the power supply voltage that my circuit boost up? well if it is, it is 17-18v from a D.C. wall plug adapter. I have recently reached a voltage of about 467v but it is just by chance and luck and I have also estimated that It charges for 5-10min. to reach a 425v. very slow isn't it? and it also affects a coil gun's efficiency isn't it?

Mains Power? do you mean the power supply voltage that my circuit boost up?
No, I mean the one from your wall, the outlet give out 110v or 240v or something. Anyway, I found an instructable about how to build a variable 0v to 1000v power supply, It might help you, the power supply should (hopefully) charge up your capacitors quickly.
I hope it helps!

oh I see in our house we got only 220 - 230V where I plug the AC-DC wall adapter to supply my Boost converter at 18v. so do you mean I just needed to add up a little more power supply lets say 20 - 24v just to fasten up the charging rate? I have seen the power supply your referring to but may be i don't have much time and money to build another circuit hehehehe..... I have watch so many coil gun developers amateurs and professional their coil guns charges lets say in just seconds...... ( Wish I can make it toooo) hehehee....

NO! Don't give your boost converter more voltage than it can handle, because it might damage your converter! Okay, if your converter charges the capacitors too slow, forget about your old converter and build another HV power supply. Since you told me your mains voltage (220v), I can design you a schematic of building a power supply that can give out about 600v, and should charge up your capacitors quickly. I will post you a schematic soon!

AHHH OK I'll keep your advice hehehe, the boost converter's LED lits up at about 320V may be if I don't charge the capacitor bank lets say 10 caps at their max voltage maybe at about 350v+ if I don't add another 10k resistor on its voltage divider but if I add it Lits up at around 270v+, maybe still it will give me a sufficient and satisfying efficiency in my coilgun isn't it? cause I was planning to make it as 3 stage coilgun (each having its own cap bank and Boost converter triggered by a relay). Maybe I'll just keep my converter and used it to my other hobbies by the way do you like to see its schematics? and does the new power supply you're referring also uses an inductor cause It was easy for me to make one thana step up or step down transformer hehehehe.......

Sorry to keep you waiting for so long, anyway, heres a 600v power supply schematic... I had built one power supply and it had charged up my 600uF capacitor in less then 10 seconds!!! And yes, I would like to see the schematic of your boost converter. Ok, the schematic, the 1N5408 diode, you can replace that with three 1N4007 diodes in parallel, the capacitors, you can add much as you want to the power supply, and you can also add in the indicators in too...

NO Dude its ok and in fact thanks for your precious time in helping me, by the way its a voltage doubler that I have seen also through research but I don't know how to build one hehehehe. So does this means I needed a wall plug to a wall socket with a voltage of 220v-230v as its main power supply? The first schematics was the original one from Erik Taylor thanks to him cause somehow I have learned a lot. and the following are the modifications that we have made specially on the voltage comparator part. I used either a dual voltage differential comparator or just a single one (LM393, TL0711, LM311 & so on). Lots of image isn't it hehehehe I hope it will be clear when you viewed it. And recently I'm also being helped by the developer of this circuit.

So does this means I needed a wall plug to a wall socket with a voltage of 220v-230v as its main power supply?
Yes, you will need a wall plug.

And your boost converter, great photos and schematic, I will try build one and see what happens for me...
Also, did you give your converter a few amps of power?

OK, but I'm thinking of something compact and carriedable, something that would fit in my Coil Gun rifle heheheheh....... Maybe I'll check my other files for an compact A.C. power supply........ Sure dude try it, by the way this would be my advice, be sure to use the same and exact part those are made internationally, before trying those alternative part as I did cause those exact parts are scarce and unavailable. By the way the inductor was not supposed to be a dough nut shape or Toroidal transformer. It was something a cylindrical in shape and is surface mount. I'll upload the original picture if you don't understand what I mean. And can you tell me the gauge of Magnet wire that you use and how many turns if you choose to use the toroidal tranformer!! And here is another advice if you choose the alternative part that I used pls. be patient cause for me I took about 10 min. to full charge my capacitors heheheh. But my later Mods just took only 5-7min. What do you mean If I give my converter a few amps???? If you have questions regarding its parts contact this friendly person- Eirik Taylor -uzzors2k@gmail.com

Ahh... I see what you are trying to build, something like a Coilgun Handgun, right, I will try find you another more efficient 600v power supply...
And yes, I know what inductor (transformer) you mean.

What do you mean If I give my converter a few amps????
Sorry, I did confused you a bit, I meant did you give your converter a big power supply? When I looked on your converter's schematic, it looks like it needs quite a few amps, so try connect your converter to a 12v car battery, it should charge your capacitors much more faster than using your small power supply that you are using now...

Do you understand?

NO NO NO DUDE ITS OK HEHEHEH don't be bother, So I know now, it doesnt means that whether my voltage supply is high lets say 12v-18v but what matters is the supply of currents in amps. Is my realization right???? heheheheheh..... What about if I supply It with banks of batteries having a 12v ratings or 2psc. of 9V? will it give me the required Amps?

So Dude It works for you??? Did you use the exact parts? and how was the speed of charging? Based on the person from this site http://uzzors2k.000webhost.com/ there's nothing wrong in the circuit..... heheheh maybe I need more exposures, experiences and knowledge on H.V. supply and converters.

Yes, your realization is right, your boost converter needs 3 amps and 12v of power for it to work properly. I don't think a bank of 9v batteries will work, but if you use a 12v lead-acid battery (car battery), it will definitely work! So try it and see what happens... It will charge up the capacitors very quickly!

And I had not built the converter yet, I am still trying to find the parts...

Oh ya, I know exactly the one you're referring to!!!!!! You see I have seen so many Coilgun Developers both Amateurs and professionals using a small and compact 12v lead Acid Battery..... Including videos from youtube. And yes their Boost Converters charges quickly and at a satisfying rate. Hmmmmm...... I wonder why Lead acid Battery? heheheheh.......... Thats the same thing that the person who creates this converter told me....... I'll try it as soon as I have save some funds and when I already bought one. By the way the acid in the battery gets lesser as long as I used and charge it isn't it?

Yep, they use a lead-acid battery because the batteries gives out a lot of power (amps), just what every converter needs...

By the way the acid in the battery gets lesser as long as I used and charge it isn't it?
I don't know what you mean here...

Also I am leaving instructables for two weeks, so I won't be able to help you for about two weeks...

Ahhhh ok I understand it now, i just recently visit an electronic shop and a motorcycle parts shop asking for that lead acid battery. And I found a 12V, 7A and its dimension was (7in Length x 31/2in Width x 31/2in Height) but I think it was too heavy for a coil gun rifle and the other one was 12V, 4A (51/2in Length x 4in width x 5in height) but slightly lighter that the first one. But before any of this take fist your vacation. Happy vacation dude and take care there.......

Hey Dude, Hey, this cool, it will be a very great great help to me hehehehe....... I'll try this one.... is it also applicable to more than one capacitor? I mean to a capacitor banks having 5 to 10 H.V. capacitors? While I was working on my boost converter I found my self messing up with indicators hehehehe..... You're right there are many led indicators like a BAR type of LEDs that changes color when the voltage is reached. I wonder Is it possible to combine those two; the Voltage Panel and a LED for a more reliable indicator?????

You can use LED indicator on the bank of capacitors.

Hey Dude, Ok, so just only A LED indicator hook up on the capacitor bank? and cannot be combined together with a volt panel for a more accurate and sure Voltage indicator?

You can connect both LED indicator and the voltmeter panel to the capacitor bank.

HEY DUDE...!!!! Oh now thats more interesting hehehehe so the LED will slowly Lit up so as the Volt panel indicates its voltage??? heheheh I can't wait to finish my gun's core components geeeeee I'm so excited....after I finish developing it maybe I'll post a picture of it in INSTRUCTABLES ......... :P

Thats right, as the capacitors get charged, the LED indicator will slowly glow brighter and the voltmeter panel will indicate the voltage from the capacitors. And be careful on what you are doing, getting shocked by the capacitor bank that is charged to 400V (or something) is not nice, it will badly hurt you or even kill you... So just be careful, and good luck with your coilgun!!!

YEHEY AHEHEHEHE..... :p.... YOU'RE RIGHT DUDE GETTING SHOCK GIVES YOU A VERY NASTY BITE AND WHEN I GET SHOCK IT MAKES ME LAUGH AT MY SELF GEEEE..... MAKES ME CRAZY AHEHEHE...... THANKS FOR THE ADVICE, DON'T WORRY I' LL DO A LOT OF CARE AND THANKS FOR YOUR PRECIOUS TIME AND GUIDANCE DUDE..... 0(_)0

I got a Question, now I'm charging 2 capacitor banks both of same voltage ratings but differs on the numbers of capacitor with each banks. now my question is that is it ok to monitor the voltage level on those two capacitor banks using only 1 voltage meter hook up from the High voltage output of my BOOST CONVERTER???

I can help you if tell me how many volts you are going to charge a capacitor with.

Hey Dude, Thanks for your comply, I have this Boost Converter that I have adopted from internet sites for coil guns, and now I have make it to work. The boost converter is supposed to use a 500V 14A POWER MOSFET but due to its scarcity in our place I just choose the available one a 400V 12A MOSFET. I'm charging the capacitors rated at 400V 200uf and I was planning to charge ten of them. During my earlier attempt I can't make the indicator to work. but now I discovered that all I need is to wait till it lit up. So somehow I manage to make it work. but still I need a knowledge on how to put a voltage/charge indicator using LEDs in case of emergency hehehe :P. A little bit knowledge that you would impart will be of very great great help HEHEHEH...... Thanks a lot.......!!!!!!