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Li-Ion Battery Charger - del90005

This circuit is built around LM3647 an Universal Battery Charger,  This Circuit is an untested design. It is based on application hints and was provided as an example to the user. This circuit gives a 12V DC from mains or battery and the battery is also charged when power resumes.   

There are tools that help you check out your concept, on paper -  Power Designer and WEBENCH

U1D monitors charge current and U1B monitors battery voltage these values are the feedback to charge controller U3. U1C drives Q2  to Control the charging process by switching in PWM. The LM7812 with a 2N6107 Current Booster Regulate the battery and mains DC to a 12V for powering the Product Circuits.

Types of Batteries, their chemistry and charging methods - Battery Charger and Rechargeable Batteries

To view the circuit below, Click the Link of PNG or PDF and view the Circuit, PNG can be Scrolled with  Drag-Drop Left-Click-Mouse and you could use the PDF to take a paper print for reference only.

PNG-Schematic     PDF-Circuit
Li-Ion Battery Charger - del90005
Below is a Preview Image Linked to the Larger Circuit
Li-Ion Battery
                        Charger - del90005

Portable electronics have got a big boost due to batteries like Li-Ion. Here is a decade old circuit to charge a large battery. It can be scaled up or down in power. It has current and voltage limit protections.

Single chip battery charge controllers are common today, so are Li-Ion, above circuit is more than a decade old.