317 Threads found on edaboard.com: Battery Charger Current
I'm looking for a battery charger IC that can be configured for 1A and 2A output based on some resistor divider or sensor.
I'm thinking of something like LTC4001 anyone has a better suggestion on the battery charger that has a 1A to 2A range and that can be easily configured to charge at 1A/4.2 and 2A/4.2. (...)
Analog Circuit Design :: 03-22-2017 16:06 :: Dino1400 :: Replies: 2 :: Views: 545
I have designed the Circuit from The power Integrations which i have attached in the Mail
My problem is when i switched on the supply on direct ac with 50% load. my TOPSWITCH is blasting.
When i am trying to turn on With the help of Variac it is working properly and taking 1.4 amp of load.
At startup waveform i have captur
Power Electronics :: 02-09-2017 12:13 :: Bjtpower :: Replies: 10 :: Views: 689
I'm sure it's possible and effective with sufficient research and diligence.
You'd need something like an LDO (paying attention to the current it can really provide with 7.2V - 3.8V * required charging current) or a Buck Converter IC might be more suitable, and probably the best choice would be a battery charger IC. (...)
Power Electronics :: 02-02-2017 23:12 :: d123 :: Replies: 1 :: Views: 329
I try to figure out the best option to have adjustable load current for this charger
I have a external device that may experience low temperatures for several days (-10 deg C or more). The battery is a special Li that can be charger from -10 normally and up to -30 deg with reduce rate of about 0.
Analog Circuit Design :: 12-20-2016 12:07 :: zuzurelu :: Replies: 0 :: Views: 531
If you've only got 8A to throw you will have no problem
finding low-enough Rds(on) FETs for the on conduction
losses to be insignificant. No matter what the voltage.
Think about what your battery bank can accept as a
charging current, that's what you will have to control
for at peak sun and low charge.
You can trade voltage for (...)
Power Electronics :: 11-24-2016 08:34 :: dick_freebird :: Replies: 24 :: Views: 1720
The pwm duty cycle calculations don't apply to the given circuit which is no boost voltage converter. Instead you are chopping the solar panel output current. No problem if you don't need maximum efficiency.
The "panel voltage" measurement isn't of much use unless you synchronize the ADC with the pwm. Similarly the battery current is also (...)
Microcontrollers :: 11-21-2016 18:33 :: FvM :: Replies: 7 :: Views: 809
You could use special battery charger ICs which i think is more safe.
For Example : Check LTC4079 IC from Linear Technology. Only needs a few resistors (and a NTC - Temperature Protection) and works up to 60V input. (250ma Maximum Output current)
Microcontrollers :: 11-14-2016 05:18 :: memarian :: Replies: 6 :: Views: 631
About basics, input is solar cell or 5 Vdc USB; and output is 5V; current is approximate 1A. Besides, i have Li ion battery.
You are missing the charger circuit for the Li-ion battery and you are also missing the voltage stepup circuit to increase the battery voltage to 5V output.
Hobby Circuits and Small Projects Problems :: 10-27-2016 00:07 :: Audioguru :: Replies: 11 :: Views: 944
isn´t htis what ready to bux battery chargers do?
Is it worth the effort to design your own?
Power Electronics :: 10-17-2016 09:22 :: KlausST :: Replies: 1 :: Views: 360
it seems if you just make a simple example, you find out what happens....
(This should be your part... at least to give some data or other informations... now we just can assume what you want to do..)
Imagine you want to charge a Pb battery.
When the battery is empty you will see maybe 10.5V
When it is slowly full charged you will see
Elementary Electronic Questions :: 08-17-2016 15:35 :: KlausST :: Replies: 4 :: Views: 587
charging a LiIon battery is a problem of current and voltage.
There are several charging techniques described in the internet. They tell you how to set (change, regulate) current and voltage.
Knowing this you can use a
* microcontroller and
* a power supply (linear, switch mode...) with adjustable voltage and/or (...)
Power Electronics :: 08-12-2016 14:58 :: KlausST :: Replies: 6 :: Views: 482
What is your financial budget? And you footprint budget on the PCB? And you current budget for the chip (although if this is a battery charger I assume the power source is big enough for both jobs)?
Why are you looking at the PIC18F devices? Not saying that there is anything wrong with this decision but it could provide useful information to (...)
Microcontrollers :: 08-07-2016 23:00 :: Aussie Susan :: Replies: 2 :: Views: 323
A Lithium battery cell is 3.2V when its load MUST be disconnected and is 4.2V when fully charged and its charging current has automatically dropped to a low amount when the charger MUST be disconnected. Then its average voltage during a discharge is 3.7V.
The boosted output voltage is set with a two-resistors voltage divider so if two of (...)
Power Electronics :: 07-25-2016 15:32 :: Audioguru :: Replies: 1 :: Views: 311
You have some boundary conditions - panel bus voltage max
and min, MPP current, battery charger input voltage and so
on. These would say whether a buck will do or whether some
corner might need boost capability. This all has to do with the
components at hand.
I'm sure you can find SPICE subcircuits or even a representation
for whatever (...)
Power Electronics :: 07-24-2016 08:32 :: dick_freebird :: Replies: 11 :: Views: 1028
A lithium battery will blow up or catch on fire if you do not correctly charge it by limit the charging current, limiting the maximum voltage and disconnecting the charger when it is detected to be fully charged.
Your "charger" is not a charger, instead it is the power supply for the (...)
Power Electronics :: 07-15-2016 16:17 :: Audioguru :: Replies: 9 :: Views: 551
The input voltage of a CD4097 or an ADC must be within the power supply voltage range of it. So you can measure the first cell with one input at the battery ground which is also the CD4047 ground.
You can measure the 2nd cell with one input at the anode and the other input at the cathode and the voltmeter can be differential. But the 3rd cell's ano
Hobby Circuits and Small Projects Problems :: 07-13-2016 22:34 :: Audioguru :: Replies: 13 :: Views: 859
A Lithium battery is first charged by a constant current until its voltage reaches 4.2V per cell then the voltage is regulated at 4.2V. Then the battery charging current automatically reduces and when it is fairly low then the charger turns off and alerts you that the battery is fully (...)
Power Electronics :: 06-04-2016 14:50 :: Audioguru :: Replies: 4 :: Views: 485
If the battery worked properly when powering the printer before but does not work properly now then probably the battery, its charger or the power supply needs replacement.
A "7.4V" lithium battery should be 8.4V when fully charged.
A healthy Lithium rechargeable battery should be able to provide a very high (...)
Hobby Circuits and Small Projects Problems :: 05-20-2016 14:03 :: Audioguru :: Replies: 7 :: Views: 361
I am using a Li Ion battery (7.4V/2200mAh)
The charging circuit I use is as
The MOSFET I am using is FDS4935BZ
It all works fine but the MOSFET heats up a lot. Meanwhile I tried reducing charge cur
Elementary Electronic Questions :: 05-11-2016 05:53 :: tiwari.sachin :: Replies: 7 :: Views: 822
I put this circuit together that charges the 3.7V Lipo battery and also produces 3.3v at the output .
An LED indicates the charging status .
I am getting 3.3v output but the LED is not lighting up and the status pin is showing zero volts .
is the charging part of the circuit correct ?
Analog Circuit Design :: 05-03-2016 04:19 :: aliyesami :: Replies: 19 :: Views: 890
Hi folks, my name is luis pepe of Argentina.
I'm working with a battery charger based on a TL494, LM741 and bta25-600 triac circuit.
The charger regulates the current supplied to the battery sensing the voltage drop in the shunt resistance.
The TL494 is synchronized with the line.
My problem is the (...)
Power Electronics :: 05-02-2016 02:17 :: lljpepe :: Replies: 3 :: Views: 669
Hi guys, I'm an electronic newbie, reading some books and I thought I had finally understood the basis of circuitry, but no... I didn't. I'm a pic programmer and began on arduino a few years ago. I saw a hole in all this "arduino stuffs" that only electronics could fill so I decided to study it.
In arduino forums, what I call "5v forum" :razz: t
Elementary Electronic Questions :: 04-23-2016 04:02 :: Tricarico :: Replies: 15 :: Views: 3801
I thought each panel would be only low power, and that you would just have a separate current regulated boost converter coming off each panel and pouring its current into the battery.
Or are you saying that there is an inverter already attached to the panels giving a 230vac output?
Because it seems a waste to have to go from the panel (...)
Power Electronics :: 03-28-2016 15:40 :: treez :: Replies: 27 :: Views: 2204
Have someone ever used the LT3650?
I have designed a circuit charging a 18650 battery. It works ok but the IC gets very hot (50C) at 12V input and over 65C at 28V. The IC has about 20mm? of copper on the bottom side and about 10mm? on the top side. Charging current is set to 1.5A. IC should have thermal shutdown but is this heating normal?
Power Electronics :: 03-22-2016 13:30 :: Moonwalker :: Replies: 26 :: Views: 1810
Can I use the ltc4057-4.2 to charge a 10440 battery?
This battery is a two terminal one (no internal thermistor) but it has an embedded PCB for protection.
If so, can I leave the battery connected to the circuit which it gives power to, during charging, so that the tp4056 provides current to charge the (...)
Power Electronics :: 03-21-2016 22:14 :: neazoi :: Replies: 6 :: Views: 684
I need to control the Chip Enable (CE) Pin for trun ON/OFF the charging application based on the voltage on there any current limitation to this CE PIN, am thinking to pull up by 10K for enable disable sinking through bc547. Is it ok, Kindly give me suggestion.
Analog Circuit Design :: 03-04-2016 05:07 :: dsanthosh67 :: Replies: 1 :: Views: 520
i was thinking that a car battery charger with a big transformer would be a good start, use a 1A 5V regulator and a LM317 linear regulator with a big heat sink. Metering:- Analogue are good but expensive, Digital meters are cheap but need a battery (DVMs cost from ?5 here in the UK). I think current overload is a must from (...)
Power Electronics :: 02-22-2016 17:04 :: chuckey :: Replies: 6 :: Views: 651
A TP4056 can do the job better than a PIC at low cost because it is designed for that purpose itself.
Microcontrollers :: 02-04-2016 09:46 :: gamegurus :: Replies: 3 :: Views: 526
well there is no point doing it any faster than 100khz.
As long as you have analog overcurrent protection, you can do the sampling at some very low frequency if you want, say a couple of 100 hertz.
Though if you slowly give it a software soft start, and you have the fast analog overcurrent protection, then you can sample at slower than that if you
Power Electronics :: 01-26-2016 17:47 :: treez :: Replies: 3 :: Views: 711
what is the Ampere-hour of the battery?
This is first needed.
But basically, lead acids have a charging regime which is constant current followed by constant voltage
So at first you charge at C/10 until the terminal voltage gets to 10V
Then you start charging at your charge rate, then when the voltage gets up to around 13V or so…..you keep
Power Electronics :: 01-20-2016 13:07 :: treez :: Replies: 2 :: Views: 383
If the charger sets the limit at 20AH, the larger battery will just take longer to charge up.
If 20AH is the maximum the charger can sustain, the extra current needed by the bigger battery will overload and possibly damage it.
The battery will not be harmed though.
Power Electronics :: 12-25-2015 09:50 :: betwixt :: Replies: 1 :: Views: 324
what you should do, for dull days, is have a big capacitor at the output of the panel, and let this slowly charge up as current dribbles out of the panel, then when the cap voltage gets so high , put it through the switching converter and into the storage battery.
When its shiningg bright, I belive as discussed above, that you need to regulate e
Power Electronics :: 12-21-2015 14:18 :: treez :: Replies: 5 :: Views: 1021
I came across a page on using a dvd player's power supply to run a load here.
I was thinking... maybe to get it to work as a trickle charger for charging a 12V car battery. After all, a dvd player would not draw high current during operation.
However, i am just not sure about the ACTUAL output vo
Power Electronics :: 11-28-2015 07:26 :: Sunny55 :: Replies: 1 :: Views: 379
Hi I have a burnt KDS120 diode in series with a charger that charges a battery. The device that is charged draws about 400mA at 6v, and this passes through the diode.
Please recomment me suitable replacements as I cannot find the same diode on ebay. They have to be pin and power compatible (used for DC 6v)
Can the BAW56 be used? (I have one availa
Power Electronics :: 11-25-2015 19:43 :: neazoi :: Replies: 5 :: Views: 489
Most of the cell phone chargers are 5V or 5.1V but the current rating veries from 500mA to 2A. Is it the charge current determined by the wall mount charger or internal circuitary of the cell phone? I belive that the charge current of the battery is determined by the charge management (...)
Elementary Electronic Questions :: 11-17-2015 05:50 :: udhay_cit :: Replies: 3 :: Views: 651
The charger circuit, the transformer or maybe both limit the current. The little charger gets hot because it is small and cheap.
A little dead battery draws the same limited current as a larger dead battery but the larger battery draws the same limited (...)
Hobby Circuits and Small Projects Problems :: 10-24-2015 00:33 :: Audioguru :: Replies: 3 :: Views: 1078
We can't find the regulations for level of PFC required above 1kw?
Is an electric car battery charger considered as professional equipment? Otherwise EN 61000-3-2 (IEC 1000-3-2) class A harmonic current limits apply.
Power Electronics :: 10-13-2015 16:00 :: FvM :: Replies: 5 :: Views: 871
We need an AC Mains current monitor to monitor the AC current going into our 3.8kw, 230VAC battery charger.
I found the HMS 05-P:
?But it look like it gives a voltage out which is just an offset sine wave with a 2.5V DC offset. (The datas
Elementary Electronic Questions :: 10-07-2015 19:22 :: treez :: Replies: 4 :: Views: 689
The power bank has the current detecting shutoff circuit on the same circuit board as its voltage boosting circuit and its Lithium battery charger circuit so you need to design all circuits for it to not shutoff when its load current is low.
A problem will be that its battery will be destroyed if it becomes (...)
Elementary Electronic Questions :: 09-28-2015 15:13 :: Audioguru :: Replies: 4 :: Views: 1047
May we use the following relay in series with the output of our 400VDC, 10A battery charger output?
We know that it is only rated for 28VDC, but we will never switch this relay when there is current flowing through it, so we will therefore be ok to use it in series with out 400VDC output?
Elementary Electronic Questions :: 09-27-2015 12:49 :: treez :: Replies: 2 :: Views: 638
I am not sure why you show a switch for the coin cell to be (1) charged with no load or (2) drive Buck regulator with no charger.
Your Title suggests you want to do both.
I only suggested a silicon diode so that battery won't drop below 20% SOC by haveing 4.2 charger-0.6V diode= 3.6V to prevent excessive underchargeof coin cell if (...)
Power Electronics :: 09-14-2015 04:37 :: SunnySkyguy :: Replies: 5 :: Views: 949
Considering PV is a current source (hi Z) and battery is a voltage source ( sink) with low Z, do you think it is a good idea to know the battery ESR.
What range of Rdson/ESR ratio would be best for minimum loss from a 300W source?
Analog Circuit Design :: 09-12-2015 17:26 :: SunnySkyguy :: Replies: 7 :: Views: 917
I would like to modify this charger to run from a DC source.
I could just just run it from an inverter but that seems like a lot of wasted energy in conversion
12vdc > 240vac > charger
Also would like to keep it all in the current case if possible.
In the old days of transformer based chargers it was easy enough, (...)
Analog Circuit Design :: 08-31-2015 07:38 :: nz_tech :: Replies: 3 :: Views: 679
Looks like a valid option if you don't need high accuracy. Rectifier reverse recovery charge is obviously a limitation.
Why is it that none of our competitors is doing this? Means you didn't yet notice a secondary AC current measurement in a battery charger. How can you be sure that nobody uses it?
Power Electronics :: 08-24-2015 07:45 :: FvM :: Replies: 6 :: Views: 627
I am trying to build a very tiny li-ion charger for the nokia bl-6c battery.
Recently I have found the tp4056 IC.
Can I use the application circuit in it's datasheet to directly charge such a battery?
What should be the resistor current setting for this specific battery?
Apart from that, can I use (...)
Power Electronics :: 08-20-2015 12:32 :: neazoi :: Replies: 0 :: Views: 520
I am working on an inverter with a battery charger for a 24V,200AH AGM battery pack. The battery charger current can be adjusted from 10 to 50 amps. Now, I want to be able to also a charge a lithium battery (24V,150AH) with this charger. Since the lithium (...)
Power Electronics :: 08-07-2015 18:22 :: bobdxcool :: Replies: 0 :: Views: 476
I'm setting up a small solar panel to act as a trickle charger for a small 12V SLA battery. I've stepped down the 22 volt max from the 1.5 watt solar panel to 13.5 volts with a buck converter, with a maximum current of about 250 mA, but when the solar panel outputs less than 13.5 volts, the buck converter starts drawing power (...)
Elementary Electronic Questions :: 05-08-2015 02:10 :: jsmith24 :: Replies: 18 :: Views: 1340
one NiMH 1.2V cannot light up the LED1, i think that is due to insufficient current. but with two 1.2VNimh battery can light up.
So, how can i adjust the resistance value in order to light up the LED1, or how to increase current in the LED 1 way when i plug in one NImh battery?
Elementary Electronic Questions :: 05-02-2015 00:20 :: SunnySkyguy :: Replies: 8 :: Views: 746
A Ni-MH cell has a voltage as high as 1.5V only when it is overcharging at a current that is too high for it. Look at or at the applications manual from .
A battery charger IC detects the small drop in voltage when a Ni-MH cell becomes fully charged then stops the charging to prevent overcharging.
Elementary Electronic Questions :: 04-07-2015 11:57 :: Audioguru :: Replies: 9 :: Views: 1371
Ordinary Li-Ion and Li-Po battery cells have a maximum voltage of 4.20V. When their charging voltage reaches 4.20V then they are only about 70% fully charged. Considerable more charging time is needed at 4.20V until the charging current is detected to drop to a low value then the charger should disconnect the cell.
Power Electronics :: 04-02-2015 01:03 :: Audioguru :: Replies: 4 :: Views: 2789