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 :
- Input power source Vin: 17 ± 1 Vdc
- Battery bulk voltage regulation: 14.8 V
- Battery voltage Vbat: 12-V lead-acid battery
- Battery refresh voltage: 13.6 V
- Fast-charge current: 0.5 A for Vbat ? 13.5 V, 1 A for Vbat > 13.5 V
- Precharge current: 0.45 A
- Termination current: 0.9 A
Oh I know what you're thinking -- it's those incredibly thermodynamically unstable lithium ion batteries up to their old tricks again. Wrong!! This culprint in this case was a lead acid battery for a lift truck.
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