lead acid charger

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totue

Joined: 18 Sep 2001
Posts: 25

12 Feb 2003 15:26 lead acid charger schematic

Hi,

i am looking for the schematic of a good lead acid chargeur with maintenance charging for a maximum battery of 65Ah.

thanks.

Totue.

flatulent

Joined: 19 Jul 2002
Posts: 4877
Helped: 324
Location: Middle Earth

12 Feb 2003 17:11 multiple battery lead acid charger schematics

The absolut simplest is to have 13.8 V applied to the battery at all times. If you want to get a bit more complex, use a current limiter so that when the 13.8 is applied to a discharged battery the current is limited to about 1/10 or 1/20 of the battery capacity. If you want to get even more complex, have the voltage 14.7 V while charging and when the current drops to 1% of the rated capacity drop to 13.8 V.

MonkeyBusiness

Joined: 16 Jan 2003
Posts: 42

12 Feb 2003 17:45 uc2906 battery charger

Check out http://www-s.ti.com/sc/psheets/slua055/slua055.pdf

arturt134

Joined: 01 Jan 1970
Posts: 141
Helped: 1
Location: Poland

13 Feb 2003 7:24 uc2906 simple design?

You can use UC2906 (linear) or UC2909 (switchmode) lead acid battery charger from Texas Instruments.

bimbla

Joined: 13 Jul 2001
Posts: 541
Helped: 13

14 Feb 2003 12:16 l200 lead acid

We can design using simple digital ic's and a analogue muxer like 4067.

ebenni

Joined: 30 Jan 2002
Posts: 123
Helped: 1

14 Feb 2003 16:06 trickle charger schematic

look at the EPE august 2001 in MCU fleman.

Al Farouk

Joined: 13 Jan 2003
Posts: 195

23 Oct 2003 14:54 uc2906 charger circuits

you can apply the idea supplied by flatulent
by building a variable voltage power supply arround LM317 and sens the current floww over a small power resistor, when the current drops use the output of the comparator that sense the current to switch the control terminal of the LM317 to drop the voltage to the current tackling mode.

barrybear

Joined: 22 Nov 2001
Posts: 268
Helped: 6

23 Oct 2003 15:16 lead acid trickle charger schematic free

A lead acid battery needs to be charged with a constant VOLTAGE rather thasn a constant current. Having built many of these that moniter the voltage and cut in at various times I have come to the conclusion that the best method is to use a very heavy rectifier and a well chosen transformer the secondry giving a voltage of 14 voltes to maintain the stait of the battery. this way will allow you to startthe car with the charger connected and not damage your charger.

Barrybear

arturt134

Joined: 01 Jan 1970
Posts: 141
Helped: 1
Location: Poland

27 Oct 2003 9:20 lead acid charger max voltage

The best algorithm is constant current, in the first stage, and constant voltage in the second stage (after achieved maximum voltage level). Also, all voltages are temperature-dependent, so charger have to track temperature. This is not important, when battery is charged in the room temperature (+20...+25 C deg), but in the industrial temperature range (-20...+70 C deg) this is very important.

leemarrow

Joined: 03 May 2001
Posts: 294
Helped: 1

27 Oct 2003 9:40 uc2906 circuit

try:
http://www.elektroda.pl/eboard/searchtopic46207-.html

barrybear

Joined: 22 Nov 2001
Posts: 268
Helped: 6

27 Oct 2003 12:22 lead acic charger l200

I would not chose the constant current first part of the charge. There will be times when you will have to charge a battery from a terminal voltage of possibly 1or 2 voltes. A constant current at this point may not inicalise the battery for a full charge. I have found that lead acid batteries should banged charge to overcome any residual coating on the plates and then left to charge for the duration of the battery capacity.

Barrybear

arturt134

Joined: 01 Jan 1970
Posts: 141
Helped: 1
Location: Poland

27 Oct 2003 12:34 site:www.edaboard.com searchtopic46207

Sure. When the battery is in deep discharge, you have to use other stage - in datasheet UC2906 (UC3906) this stage is called "trickle charge". The battery is charged low constant current. When voltage rises above minimum voltage, charger switches to normal charge.
Look at the datasheet UC2906 from Texas Instruments.

ASIC

Joined: 18 May 2001
Posts: 221

27 Oct 2003 18:49 lm317t lead acid trickle charger

What if the charging current comes from a set of solar panels and the current cannot be quaranteed?

ASIC

Fragrance

Joined: 26 Jul 2002
Posts: 1385
Helped: 24

06 Nov 2003 7:23 uc2906 car charger

Properly charging of sealed lead acid batteries is very importent thing for long and trouble free battery service the upload file contain a very good quality lead acid batteries charger
With these feature’s capable of quickly and safely charging of lead acid batteries providing with temperature compensation in addition two step charging level with automatic switch over and floating voltage charging.

Hope help full for other user to. I am using this charger with out any trouble and problem

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Fragrance

Joined: 26 Jul 2002
Posts: 1385
Helped: 24

06 Nov 2003 12:38 uc2906 schematic

hi

re uploaded better version of the pdf file sory for trouble Crying or Very sad

i forget to recompile it

dacadc

Joined: 22 Apr 2001
Posts: 243
Location: Ukraine

08 Nov 2003 9:13 gel lead acid charger schematics

You can use my reference design, AN2107 which is published at Cypress site. It capable to charge several battery types, including ACID.

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08 Nov 2003 9:13 Ads

Fragrance

Joined: 26 Jul 2002
Posts: 1385
Helped: 24

25 Nov 2003 8:51 lead acid charge profile

hi

here is an other design very best with alarm reverse polarity protection and much more with it

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dacadc

Joined: 22 Apr 2001
Posts: 243
Location: Ukraine

25 Nov 2003 8:56 uc2906 example circuit

I think, the best way is to refine specifications and later select appropriate device. It standart charging profile is reqired only, use fixed-function chips. For more advanced designs the best way build around CPU and implement all functions in the firmware.

Fragrance

Joined: 26 Jul 2002
Posts: 1385
Helped: 24

08 Dec 2003 15:32 uc3906 charger printed circuit board

hi,

here is the pcb for my first uploaded file

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henrik2000

Joined: 06 Jul 2001
Posts: 109
Helped: 1

28 Dec 2003 7:06 constant current voltage limited charger lm350

This is a very interesting question, in my opinion.
If you talk solar, then you have a number of parameters to take under consideration.
- Solar panel voltage
- Battery voltage
- Type of battery (lead acid, gel, etc)
- Current requirement of the inverter if used with a UPS

The best I could come up with is a digital solution using the very good A to D from Linear technology (24 bit resolution 0.5 ppm offset, 0.55 uV noise 110 dB rejection @ 50 or 60 Hz) and a micro such as the Motorola HC12. The end result is pretty nice. The battery is even disconnected from the UPS if the load requirement is low enough to be provided directly by the solar panel!

Due to the fact that such equipment can be placed outside where temperature can easily raise to 48 Celsius degrees, it is quite a very challenging analog design! So I forgot about analog and used pure digital technique.

Results are economic, no drift in time or no adjustment with 10 turns pot here and there... All parameters are programmable and all the floating parameters are taking care of in the digital world. A 4 lines x 20 characters LCD display the status and a simple keypad is used to modify and store in the HC12 EEprom the various desired parameters.

In short, efficient, economic and maintenance free! Try to do the same in the analog world... (I mean discrete components) and you would end up with a very large monster!

ASIC wrote:

What if the charging current comes from a set of solar panels and the current cannot be quaranteed?

ASIC

hotspot47

Joined: 20 Feb 2006
Posts: 1

20 Feb 2006 10:25 schemat 13,8v na lm350

Hi, what do I need to download the files. thankx

henrik2000

Joined: 06 Jul 2001
Posts: 109
Helped: 1

21 Feb 2006 14:47 3 stage charger lead acid battery schema

ASIC wrote:

What if the charging current comes from a set of solar panels and the current cannot be quaranteed?

ASIC

[/quote]

I'm not exactly sure I understand the question: do you mean:

1) Current comming from the solar panels? (It's never the case anyway due to variation of the light during the day etc..)

2) The current from the bateries (never the case anyway due to cell variations ageing etc)

3).. ? Please be more specific.

Cheers

pico

Joined: 30 Sep 2001
Posts: 285
Helped: 6

21 Feb 2006 15:07 lead acid trickle charger schematic diagram

As flatulent's post.
In addition if your battery is not a 12V. nominal, you can caculate it's charging voltage as follow
Full charge is 2.3V per cell and during maintenance charge period use 2.45V. per cell

N.B. Lead acid battery's nominal voltage is 2V. per cell

mitesh

Joined: 13 May 2002
Posts: 288
Helped: 6

26 May 2006 13:38 schematic charger automatic 12v-15a battery acid

Thanks for the design, but i want more cheaper solution as i will control it by mcu. Do any one have solution for chnaging Leasd acid battery with mcu.

artem

Joined: 22 May 2003
Posts: 1652
Helped: 91
Location: Turan

26 May 2006 14:12 lm317 charger lead temperature compensation

mitesh , better but more complicated design based on mcu is availbale from atmel site application note section . Design supports multiple battery types and capacities set at compile time .

Troela

Joined: 17 Apr 2006
Posts: 19
Helped: 1

05 Jun 2006 16:08 datasheet sealed lead acid charger

We use this power supply with backup battery for measuring data. The data comes from a sunny boy. That can record the amount of solar light, Udc Uac, P etc...

With the L200 you can define the maximum charge current en the charge voltage. The battery deliver only voltage when then net (230vac) falls away. The battery is a lead acid battery of 24V. With R5 you control the voltage, with R4 you control the current.

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bipinravalia

Joined: 19 Mar 2007
Posts: 4

29 Feb 2008 15:42 lm350 backup charger

Hi everyone, I want a charger schematic which can charge a 35AH Lead Acid Battery (car battery). Can someone provide the working schematic? I made a charger using LM350 but it dont supply more than 150mA.

Thanks for your suggestions.

salmansalman

Joined: 30 Jan 2008
Posts: 28

30 Mar 2008 9:30 l200+chargeur+high+current

all posts were very informative ...

but i have some questions in mind ... what if i have a 220V/12V 10A Transformer with bridge rectifier connected to it to convert it to 12V DC and i put a 15A fuse in series and then connect it directly to the battery terminals ... what will happen?? will it start charging the 12V car battery??? I hope it will start charging the battery ... but how can i know that by connecting it this way .. how much current would flow through the battery????