Hello, I have a transformer(24V-100A) and I want to use it to develop a fast charger for Pb car battery. This what I want from this project:
->control of the charger current(constant current)
->constant voltage(14,4V)
->if is possible a shutdown when the battery is maximum charged.
Why 100A, because this gonna be used for a quick charge process... I was thinking of a voltage regulator
I'm waiting for your suggestions and new schematics eventually.
->control of the charger current(constant current)
->constant voltage(14,4V)
->if is possible a shutdown when the battery is maximum charged.
Why 100A, because this gonna be used for a quick charge process... I was thinking of a voltage regulator
I'm waiting for your suggestions and new schematics eventually.
An externally hosted image should be here but it was not working when we last tested it.
how big of battery?
what type of battery?
different discharge condition temperature of battery and type of battery, demand different charge rates.
the results of overcharge ate at least outgassing and boiling acid away, to warped plates to catastrophic failure , explosions, injury and death, etc.........
so...
what type of battery?
different discharge condition temperature of battery and type of battery, demand different charge rates.
the results of overcharge ate at least outgassing and boiling acid away, to warped plates to catastrophic failure , explosions, injury and death, etc.........
so...
There are lots of problems in this circuit.
1. Where is the inductor? The controller is a PWM controller - right?
2. The output transistors will not saturate with 12 volts on the driver transistors.
3. How are you closing the feedback loop?
I would suggest you figure out your requirements and then develop an approach that will meet them. Don't design the circuit first.
1. Where is the inductor? The controller is a PWM controller - right?
2. The output transistors will not saturate with 12 volts on the driver transistors.
3. How are you closing the feedback loop?
I would suggest you figure out your requirements and then develop an approach that will meet them. Don't design the circuit first.
this designe is modification on smps of car power amplifier.
Moster ar irfp064 and the circuit drive ar original of car amplifier.
The modifier in this circuit ar feedback (the voltage on the optocuplor)
Moster ar irfp064 and the circuit drive ar original of car amplifier.
The modifier in this circuit ar feedback (the voltage on the optocuplor)
you do need an inductor, without it you are pulsing the battery with high current long duration pulses, not good, basically all you have is a switch.
you are creating a non-isolated buck converter. (it is isolated through the big transformer though)
you will need to have a current limiting circuit in addition to voltage feedback, i would suggest a 33025 or a 3845 which has both voltage and current sense lines and a single output. i would think that the 3845 is a better choice.(If iam wrong someone will say so..)
as far as the battery goes.
1. set current limiting to about c/8~.
2. the voltage algorithm can be done with lm339 configured as schmitt trigger as a comparator.
www.national.com/ds/LM/LM339.pdf
www.national.com/an/AN/AN-31.pdf
for your deep cycle 90ah batteries c/10 would be like 9 amps each, though deep cycle batteries can usually be charged with 10 to 12 amps each. however it is important to contact battery manufacturer to get the charge rates.
http://xtronics.com/reference/batterap.htm
http://www.batteryuniversity.com/partone-13.htm
some app notes with good info. however, the uc 3906 and 3909 ics will not work with large banks of batteries well and does not reset reliably. but the information is good.
http://www.ti.com/lit/gpn/uc3906
http://www.ti.com/lit/gpn/uc3909
so... look into this first.
you are creating a non-isolated buck converter. (it is isolated through the big transformer though)
you will need to have a current limiting circuit in addition to voltage feedback, i would suggest a 33025 or a 3845 which has both voltage and current sense lines and a single output. i would think that the 3845 is a better choice.(If iam wrong someone will say so..)
as far as the battery goes.
1. set current limiting to about c/8~.
2. the voltage algorithm can be done with lm339 configured as schmitt trigger as a comparator.
www.national.com/ds/LM/LM339.pdf
www.national.com/an/AN/AN-31.pdf
for your deep cycle 90ah batteries c/10 would be like 9 amps each, though deep cycle batteries can usually be charged with 10 to 12 amps each. however it is important to contact battery manufacturer to get the charge rates.
http://xtronics.com/reference/batterap.htm
http://www.batteryuniversity.com/partone-13.htm
some app notes with good info. however, the uc 3906 and 3909 ics will not work with large banks of batteries well and does not reset reliably. but the information is good.
http://www.ti.com/lit/gpn/uc3906
http://www.ti.com/lit/gpn/uc3909
so... look into this first.
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