Building a Low Volt Disconnect (LVD) ll Prevents over discharging batteries!

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Sponsored by JLCPCB jlcpcb.com/ Order 5 PCB's from only $2 (Any Color)
Simple yet very effective circuit. Credit to the source of the circuit: www.reuk.co.uk/wordpress/elect...
Instructions, Schematic, Component list & PCB gerber files using the link below:
www.schematix.co.nz/post/new-...
Voltage devider calculator:
ohmslawcalculator.com/voltage...
Information provided in this video is for educational purposes only.
If you attempt to recreate/replicate anything you’ve seen in this Or any other video, you’re doing so at your own risk.
Schematix

Опубликовано:

28 авг 2020

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Комментарии : 45

@AntonioClaudioMichael 3 года назад

Very nice fume extractor build for the batteries

@BoB4jjjjs 3 года назад

Now I could think of lots of applications for that circuit.

@derofromdown-under2832 3 года назад

An excellent presentation as per usual... WELL DONE!!! 10/10

@Viddiecent 3 года назад

Beautifully simple and elegant solution Amon :) great vid as always! by the looks of the fan shroud I might have just the excuse I need to justify a 3D printer :P haha

@HBrsz Год назад

This is a great video. Thank you. It would be great if you could make an updated version using a mosfet.

@omkarkhade4602 3 года назад

Nice video & great explanation : )

@rstor22 3 года назад

What would be the power consumption of this circuit once the cut off has engaged?

@eugy2008 3 года назад

Excellent video. I am currently looking to buy or make a voltage disconnector. Could someone suggest how to modify this circuit to switch off at approx. 2.7~2.8 volts and switch on at 3~3.3 volts?

@Mezmorize99 2 года назад

Wish this was a kit to purchase. Especially if it was preset for 18/20v lithium packs for power tools.

@03blackoperandi 9 месяцев назад

Thanks for clear and concise explanation. Nice implementation, yet I think it still needs more important features. Once it turned off, those 555 circuit is still active and drawing current continously. Which is kinda a bummer, exactly for the battery life that we want to protect. I prefer using a kind of momentary switch to turn the circuits on, then eventually it would terminates completely when it switched off. Using MOSFET (instead of a relay) is another huge bonus for efficiency.

@mikex691 2 года назад

Excellent!!!

@JUANLOWBATT 3 года назад

Very informative....

@lawalmohammed83 2 года назад

Please Sir is it efficient to use it for led torch application requiring the usage of portable lithium ion battery as a source of power? You also talked of swiping the Relay for a Mosfet, is it to improve the efficiency?

@markklenke 3 года назад

Since you added solder to the traces, how many amps would this board handle?

@anwarigroup 3 года назад

One of the cow from the field said you could use a BMS.

@satishgajini9086 2 года назад

Sir please share the circuit diagram for LVD(LOW VOLTAGE DISCONNECT) 1.connects the when the voltage >48vdc(load 100 amps) 2.disconnects the circuit when the voltage

@coolnic1137 2 года назад

Which SRD type did you use?

@coolnic1137 3 года назад

Can a 12V battery be used with this circuit?

@AntonioClaudioMichael 3 года назад

Were the link for the calculator that would be helpful for me

@Schematix 3 года назад

Here ya go ohmslawcalculator.com/voltage-divider-calculator

@jumbo999614 6 месяцев назад

How to convert gerber files that I download from your link to PCB doc file? I send the file to my store and they asked me to convert it.

@p_mouse8676 3 года назад

It's not so difficult to actually build normally open contacts with MOSFETs as well. Since this is just a window comparator I personally wouldn't use the standard NE555 in a battery powered circuit because of its power consumption. Nice to have a portable extractor 👍🏻😎

@Schematix 3 года назад

Actually, that would make a good video topic! Building an NC/NO MOSFET switch.....

@p_mouse8676 3 года назад

@@Schematix haha. Yes. Solid state relay is also possible. Obviously the same thing, but easier to use.

@publicmail2 3 года назад

Why not use a 18650 charge board with that build in and can charge or run by wall charger too?

@Schematix 3 года назад

For sure that feature could be implemented into the fume extractor however, I'm personally not bothered by removing the 18650s and changing them.

@p_mouse8676 3 года назад

@@Schematix what he means is there are so called bms boards. They won't even protect your batteries, but switch automatically as well as charge batteries at the same time.

@Schematix 3 года назад

@@p_mouse8676 For lack of a better explanation, this LVD is more universal in applications than an off the shelf BMS. This could be used on SLA, Lipo, NIMH and so on. Plus since the relay is mains power rated, it can be used to switch 110~240AC power. Sure this doesn't have the fancy bells & whistles of your typical BMS. However, In an application where you just simply need a set voltage cutoff, or switching mains power, this gets the job done.

@p_mouse8676 3 года назад

@@Schematix that's totally true! 👍🏻 I guess that wasn't completely clear in the video maybe?

@willp3137 Год назад

Hope anyone here can help...I am looking for this very application, to be used on 4cell and 5cell packs Nihm or nice batteries... preferably with lcd screen to select both up and down voltage to trigger cutoff. Intent to use this application for both charging and discharging batteries. The modules I have seen matching this secure, are only for lead acid batteries. In fact.. I need a large order if I could locate manufacturer

@lelandclayton5462 3 года назад

Replace R2 and R4 with some 10K 10 turn trimmers.

@skysurferuk 3 года назад

Just what I was thinking. Why bother using fixed resistors?

@ratgreen 3 года назад

What about under 5v? Eg 3v for 18650 protection.

@coolnic1137 3 года назад

You would have to boost the voltage from the 18650’s to at least 4.5 or higher otherwise NE555 will most likely not work due to insufficient voltage.

@angryman3317 2 года назад

I get It's an old thread/video but it was my understanding that all 18650 lithium cells actually had Circuit boards in the end of them that had voltage protection ect. Is this not your experience?

@manjunath.g.r.9122 3 года назад

can i use this ckt for 48V ?

@coolnic1137 3 года назад

The VReg LM7805 nor NE555 can handle that much voltage you would have to drop it down to at least 16V for NE555 to handle it, but I think the max input V of LM7805 is higher than that of NE555 but I think it’s somewhere in the 30 range.

@desmondhow343 3 года назад

Why not just use a potentiometer you can have all the voltage that you want

@dinantdekruijff4735 3 года назад

Why so much advertising in your video it's not word to get so much between content

@codiecarroll735 3 года назад

I didn’t get any ads. Only his jlpcb ad during the vid

@shazmiah 2 года назад

I don't see the usefullness of this circuit. The whole point of a LVD is to disconnect/connect the source voltage when it goes below or above a certain threshold. All this circuit does is open or closes relay contacts.

@isoguy. 3 года назад

Been with yo for years, just unsubscribed. Why? Too many adverts/ paid promotions. Now unsubscribing from all channels with mid role adverts. Prolific adverts killed tv, now adverts are killing the tube. Greedy tube.

@Schematix 3 года назад

Well, that's a shame :( The reality is these videos cost a lot of money, time & effort to produce. Money no object, I would produce videos ad/sponsor free however, I need to eat just like any other man. Most of my videos don't qualify for mid roll's since they are under 10mins long. And maybe if ads bother you so much, consider buying youtube prem? = Good buy adverts! :)