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24V Battery Charger Schematic by maxolous on February 3, 2011
License: Attribution Non-commercial Share Alike (by-nc-sa) Intro: 24V Battery Charger Schematic The battery charger is originally designed by me to meet the need of some who want a 24V battery charger. The charger is in three stages; the power source, current limiting and float charge stage. In this design, 240/24Vac(rms) transformer was used. After rectification and filtration i got about 30Vdc.Therefore the transformer and diode rating should be well chosen to meet your demand At the current limiting stage , transistor U1,Q1 and resistor R4 plays the vital roll in the current limiting; When U1 switches on it short circuits the gate voltage of Q1 thereby restricting current flow through the battery under charge. U1 will only switch when Voltage across it's base-emitter Vbe is up to 0.7V. the voltage drop across R4 determine this,if the voltage drop across R4 is up to 0.7V then U1 switches on then, I(current thru batt)=0.7/R4(sense resistor). Ohms Law. The float charge stage come to play when the Battery Voltage builts up to 28Vdc. In this design once the voltage gets to 28Vdc, it is considerably large enough to make the zener diode reach it breakdown voltage. And once this is done U2 switches on and consequently short circuit gate voltage of Q1. The charger is now said to float charge. Note: In most cases d3 is chosen to be10v but, 6vcan be chosen for logic MOSFETs. And this current limiting circuit only allow N-channel MOSFETs
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nickk says:
Feb 4, 2011. 3:23 PM REPLY
Nice Charger :)
maxolous says:
Feb 5, 2011. 11:06 AM REPLY
Thank you very much Nickk, just following your footstep. regards
adil.ali2010 says: friend. if i want to charge 12v battery.so what changes i do in this circuit?
Feb 5, 2011. 11:03 AM REPLY @adil, if you wish to modify it to be 12v charger, change R6 -1.1k,D4-6V zener,Xformer -240/12vac(rms) and for a higher current, change MOSFETs to higher one e.g IRF260 and offcourse R4, using the formular given . R4 must be wire wound resistor of suitable wattage.
maxolous says: The circuit above can be modified to a higher Voltage charger and current capacity
