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BQ24105 Switch Mode Lead Acid Battery Charger

2015-10-12 14:46  
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Switch mode circuits can implement the lead acid battery charger with a more efficient. It can be constructed using bq24105 battery charger controller. The bq24105 was originally designed to charge single-, two- or three-cell Li-polymer and Li-ion battery packs. The bq24105 doesn’t has a feature? to control lead acid battery charger termination. So external circuitry is added? to enable this controller to charge lead acid batteries. Switching mode charging method for lead acid batteries provides high efficiency, although the circuit becomes more complex. Here is the circuit :

switching battery charger circuit schematic diagram

Lead-acid battery charging system design specification:

Input power source Vin: 17 ± 1 VdcBattery bulk voltage regulation: 14.8 VBattery voltage Vbat: 12-V lead-acid batteryBattery refresh voltage: 13.6 VFast-charge current: 0.5 A for Vbat ? 13.5 V, 1 A for Vbat > 13.5 VPrecharge current: 0.45 ATermination current: 0.9 A

[Schematic diagram source: Texas Instrument Application Report]

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