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How does a load sharing battery charger work?
The power source now has to supply the device while charging the battery. The battery can deliver energy to the system load when the power source is absent as depicted in Figure below. This circuit shows how to design a simple load sharing system using Microchip’s MCP73837 device for cost-sensitive applications.
What’s the maximum current for a load sharing system?
This circuit shows how to design a simple load sharing system using Microchip’s MCP73837 device for cost-sensitive applications. The system load consumes a maximum current of 500 mA when all applications are running at the same time.
Is there risk of oscillation between load sharing schemes?
With this scheme (and many other load sharing schemes) there is some risk of oscillation between modes. This can be addressed with hysteresis and addition of a degree of delay in the switching. Operating Q1 in a linear mode rather than on/off so you get a smooth changeover probably helps.
How does the ICC Charger work with iLoad?
If Icc is > Iload the charger will raise the battery + load voltage to 4.2V then change to CV (constant voltage) mode and maintain voltage at 4.2V. The CN3065 termiantes charging when Icharge = C/10 where C is the programmed charging rate = 1800/RIset.
How long does a Li ion battery last?
The system load consumes a maximum current of 500 mA when all applications are running at the same time. A 950 mAh rated Li-Ion battery is available to operate the example portable system for nearly two hours during intensive load operations. The actual battery run time may vary based on the system load, battery age, and environmental conditions.
What kind of Charger do I need for a lithium battery?
You should make sure your circuit can run on the full voltage range of the battery (usually 3V-4.2V, but sometimes down to 2.4V) as well as 5V from USB. You should make sure that your charging power source can supply enough current to charge the battery as well as power the circuit.